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Mechanical behavior of sealed waterproof for shield tunnel segment joint under different assembling ellipticity Sci. Progess (IF 1.906) Pub Date : 2021-01-25 Zhang Junwei; Guo Sicen; Chen Yunyao
During the construction and assembling stages of shield tunnels, the ellipticity of segment assembly, and the angle between segments are the main reasons for joint leakage of shield tunnel. In this paper, taking Chengdu Metro shield tunnel as the research background, the relationship between assembling ellipticity and segment opening angle is obtained by geometric calculation, and the waterproof effect
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Evaluation of the selection of proper metro and tram vehicle for urban transportation by using a novel integrated MCDM approach Sci. Progess (IF 1.906) Pub Date : 2021-01-15 Ömer Faruk Görçün
This paper presents a novel integrated multi-criteria decision-making model consists of the CRITIC (CRiteria Importance Through Intercriteria Correlation) technique and the EDAS (The Evaluation based on Distance from Average Solution) method to evaluate the selection of the urban rail vehicles operated in the public transport systems. In order to determine the selection criteria in a more realistic
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Engineering application and study on polyurethane-corrugated steel plate insulation lining of existing railway tunnel in seasonal frozen area Sci. Progess (IF 1.906) Pub Date : 2021-01-15 Guangyao Cui; Xuelai Wang
In order to solve the problem of freezing damage treatment and anti-freezing design for railway tunnels in operation in the seasonal frozen area, this paper proposes a polyurethane-corrugated steel plate insulation lining, and studies its thermal insulation effect, relying on a freezing damage treatment project of an existing passenger-dedicated tunnel for on-site application. In this paper, the insulation
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Experiment investigation of injection parameters effects on injection stability of a high pressure common rail system Sci. Progess (IF 1.906) Pub Date : 2021-01-13 Ziguang Gao; Guoxiu Li; Hongmeng Li; Chunlong Xu; Yanhong Kang
High pressure common rail system can precisely control the injection time and injection pressure to improve the thermal efficiency of the engine. The injection characteristics of the system can affect the combustion and emission process of the engine. Injection stability is defined as variation characteristics of injection. This could have an unignored influence on combustion and engine output, while
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Springback angle prediction of circular metal tube considering the interference of cross-sectional distortion in mandrel-less rotary draw bending Sci. Progess (IF 1.906) Pub Date : 2021-01-11 Huifang Zhou; Shuyou Zhang; Lemiao Qiu; Zili Wang
The springback directly affects the forming accuracy and quality of metal bent-tube, and accurate springback prediction is the key to the springback compensation and control. This paper investigates the springback of mandrel-less rotary draw bending (MLRDB) of circular metal tubes, and an innovative method, springback angle prediction considering the interference of cross-sectional distortion (IoCSD-SAP)
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Model compounds-based study on adsorption and dispersion properties of lignin-based superplasticizer Sci. Progess (IF 1.906) Pub Date : 2021-01-11 Shuangping Ma; Qingjun Ding; Fen Zhou; Huaxiong Zhu
The chemical modifications of lignin-based superplasticizers have attracted extensive attentions during recent years. The comprehending of the structure-activity relationship of lignin-based superplasticizer is important to promote the modification and application research of lignin resources. However, lignin features complex and variable molecular structure, which is not conducive to study on structure-activity
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Robust optimization approach to emergency mobile facility routing Sci. Progess (IF 1.906) Pub Date : 2021-01-11 Jianxun Li; Kin Keung Lai; Yelin Fu; Hai Shen
Emergency events such as natural disasters, environmental events, sudden illness, and social security events pose tremendous threats to people’s lives and property security. In order to meet emergency service demands by rationally allocating mobile facilities, an emergency mobile facility routing model is proposed to maximize the total served demand by the available mobile facilities. Based on the
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Analytical method for the out-of-plane buckling of the telescopic boom with guy cables Sci. Progess (IF 1.906) Pub Date : 2021-01-11 Lixia Meng; Zhaojian Gui; Ke Zhang; Junru Liu; Shiming Liu
The guy cables can effectively improve the bearing capacity for the telescopic boom of the crane, while the introduction of tensioned cables makes the buckling analysis complicated. The primary objective of this study was to propose an analytical method for the out-of-plane buckling of the telescopic boom with the spatial symmetric guy cables. To analyze the influence of the guy cables on the out-of-plane
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Vibration characteristics of triple-gear-rotor system in compressed air energy storage under variable torque load Sci. Progess (IF 1.906) Pub Date : 2021-01-11 Xinran Wang; Yangli Zhu; Wen Li; Dongxu Hu; Xuehui Zhang; Haisheng Chen
This paper focuses on the effects of the off-design operation of CAES on the dynamic characteristics of the triple-gear-rotor system. A finite element model of the system is set up with unbalanced excitations, torque load excitations, and backlash which lead to variations of tooth contact status. An experiment is carried out to verify the accuracy of the mathematical model. The results show that when
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Appropriate locations of fixed bearings of continuous beams considering rail-bridge thermal interaction Sci. Progess (IF 1.906) Pub Date : 2020-12-29 Ping Lou; Yi-Wei Cheng; Te Li; Xiang-Min Zhang
Due to the rail-bridge thermal interaction, the high additional axial force in continuously welded rails on continuous bridges may lead to rail buckling or breaking. However, there is little research on the influence of the location of the fixed bearing of continuous beam on the additional force of rail. In order to study the influence of bridge bearing arrangement on the additional longitudinal force
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Generalized model for conic-V-shaped flexure hinges Sci. Progess (IF 1.906) Pub Date : 2020-12-28 Jianyi Kong; Zhao Huang; Xiaodong Xian; Yingrui Wang; Puliang Yu
This paper presents a new class of flexure hinges, namely, conic-V-shaped flexure hinges (CFHs), which can be used as a generalized model for flexure hinges with profiles such as parabolic-V-shape, elliptical-V-shape, and hyperbolic-V-shape. Compliance and precision equations for the CFHs were derived as a set of nonlinear equations using Castigliano’s second theorem. The parameters of the nonlinear
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Design and manufacture of the novel drum worm pair Sci. Progess (IF 1.906) Pub Date : 2020-12-28 Jingzi Zhang; Jin’ge Wang; Kai Wang
Although a significant amount of research on robot joint reducer was conducted, there are few systematic investigations on a novel joint reducer adopting inner worm-gear plane enveloping drum worm drive. To satisfy the development of modular robot joint, the primary objective of this paper was to systematically investigate the drum worm drive adopted in the novel joint reducer with integrated structure
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Determination of permissible contact stress of case hardened raceway of roller slewing bearing Sci. Progess (IF 1.906) Pub Date : 2020-12-23 Li Yunfeng; Jia Lei
The permissible contact stress for the rolling bearing made of the through hardened bearing steel has been established based on experience, while there is no definite value or calculating formula of the permissible contact stress for the slewing bearings which are hardened only on the raceway surface yet. To determine the permissible contact stress of the case hardened raceway of roller slewing bearing
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Detecting the normal-direction in automated aircraft manufacturing based on adaptive alignment Sci. Progess (IF 1.906) Pub Date : 2020-12-23 Ying Zhang; Hongchang Ding; Changfu Zhao; Yigen Zhou; Guohua Cao
In aircraft manufacturing, the vertical accuracy of connection holes is important indicator of the quality of holes making. Aircraft products have high requirements for the vertical accuracy of holes positions. When drilling and riveting are performed by an automatic robotic system, assembly errors, bumps, offsets and other adverse conditions, can affects the accuracy of manufacturing and detection
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The effect of slurries on lapping performance of fixed abrasive pad for Si3N4 ceramics Sci. Progess (IF 1.906) Pub Date : 2020-12-23 Wang Zhankui; Pang Minghua; Liang Mingchao; Yao Jianguo; Ma Lijie; Su Jianxiu
In this paper, a series of experiments were carried out to explore the effect of slurry pH on materials removal rate (MRR) and surface quality in lapping of Si3N4 ceramics wafers with fixed abrasive pad (FAP) using different slurries with different pH. Then, the scanning electron microscope was employed to detect the microtopography and abrade smooth of FAP for exploring the effect of slurries pH on
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Design and topology optimization of air conditioning suspension bracket for metro Sci. Progess (IF 1.906) Pub Date : 2020-12-22 Qian Xiao; Wei-nian Guo; Li-ting Yang; Sheng-tong Zhou; Dao-yun Chen
During the operation of subway vehicles, the vibration of air conditioning units is mainly transmitted to the vehicle body through the suspension support, which seriously affects the stability and comfort of the vehicle during operation. Therefore, the design and optimization of the suspension support of air conditioning units has become a hot topic in the research of the dynamic characteristics of
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Two cosine wave elastic-plastic contact model Sci. Progess (IF 1.906) Pub Date : 2020-12-22 Tieneng Guo; Xu Hua; Lingjun Meng; Zhijie Yan; Liwei Peng
Based on Hertz elastic contact theory, the contact mechanics model of two cosine wave is established. The mechanical characteristics of the model in the elastic, elastic-plastic, and plastic stages were studied. The influence of load on contact deformation and other characteristics is considered. The finite element method is used to analyze the deformation process of the model, and the results are
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Optimal design of blade in pump as turbine based on multidisciplinary feasible method Sci. Progess (IF 1.906) Pub Date : 2020-12-22 Miao Sen-chun; Zhang Hong-biao; Wang Ting-ting; Wang Xiao-hui; Shi Feng-xia
In order to make the pump as turbine (PAT) run efficiently and safely, a multidisciplinary optimization design method for PAT blade, which gives consideration to both the hydraulic and intensity performances, is proposed based on multidisciplinary feasibility (MDF) optimization strategy. This method includes blade parametric design, Latin Hypercube Sampling (LHS) experimental design, CFD technology
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Experimental and numerical investigation of stiffened angle connection in a minor axis Sci. Progess (IF 1.906) Pub Date : 2020-12-02 Peng Wang; Jianrong Pan; Zhan Wang; Bin Li; Jiangui Qin
The bolted angle connections which are simple, fast, cost-effective, high quality, and no site welding have been recognized as their excellent performance. The moment-rotation behavior of both major and minor axis should be both taken into considering, however, the lack of research on minor axis limits the more comprehensive application. Five monotonic tests were carried out to investigate the influence
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Influence of boundary conditions on three-dimensional vibration characteristics of thick rectangular plates Sci. Progess (IF 1.906) Pub Date : 2020-11-22 Yufei Zhang; Jingtao Du
Vibration analysis of the classical elastic structures is not only essential for the study of vibration reduction by predicting the dynamic behavior, but also important to ensure a reliable, safe, and lasting structural performance through the proper design procedure. In this paper, the influence of boundary conditions on the free and forced three-dimensional vibration analysis of thick rectangular
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Design and experimental study of a novel 7-DOF manipulator for transrectal ultrasound probe Sci. Progess (IF 1.906) Pub Date : 2020-11-22 Yongde Zhang; Dexian Liang; Liyi Sun; Xiaowei Guo; Jingang Jiang; Sihao Zuo; Yanhua Zhang
Traditional hand-held ultrasound probe has some limitations in prostate biopsy. Improving the localization and accuracy of ultrasound probe will increase the detection rate of prostate cancer while biopsy techniques remain unchanged. This paper designs a manipulator for transrectal ultrasound probe, which assists doctors in performing prostate biopsy and improves the efficiency and accuracy of biopsy
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Study on the velocity characteristics of spiral flow in pipeline with different numbers of guide bars installed on the surface of the piped vehicle body Sci. Progess (IF 1.906) Pub Date : 2020-11-22 Yongye Li; Gao Yuan; Zhang Tao; Xihuan Sun; Xuelan Zhang
The piped hydraulic transportation of tube-contained raw material is a new low-carbon and environmental protection technique for transporting materials. The velocity characteristics of the spiral flow in the pipe with different numbers of guide bars installed on the surface of the piped vehicle body during piped hydraulic transportation of tube-contained raw material were studied by the theoretical
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Prediction of casing wear depth and residual strength in highly-deviated wells based on modeling and simulation Sci. Progess (IF 1.906) Pub Date : 2020-11-22 Liangliang Ding; Miao Xian; Qiang Zhang
Casing wear is a serious problem in highly-deviated wells because serious wear will lead to casing deformation, drilling tool sticking and failure of subsequent operations. The purpose of this paper is to predict casing wear depth and evaluate its effect on casing strength degradation in highly-deviated well drilling operation. Special attention has been given to the algorithm to achieve the prediction
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Simulation study on modified coil configuration used for shrink fitting of semi-built-up crankshaft and parameters influencing the thermal distribution Sci. Progess (IF 1.906) Pub Date : 2020-11-19 Jianguo Duan; Qinglei Zhang; Xintao Long; Kebin Zhang
Semi-built-up crankshafts are universally manufactured by shrink-fitting process with induction heating device. The configurations of induction coil have a great impact on the distributions of eddy current and temperature of crankthrows. Most induction devices are apt to cause some undesirable phenomena such as uneven temperature distribution and irregular deformation after induction heating. This
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Optimal starting control of zero-synchronous shock AMT based on torque compensation Sci. Progess (IF 1.906) Pub Date : 2020-11-19 Lu Zhao; Yang Lin; Zude Li; Chenlu Huang
This article first puts forward the shortcomings of current AMT starting control in the preface. Then, in the second chapter, the dynamic analysis of the starting process was carried out, and the three requirements of starting control were clarified: dynamic requirements, smoothness requirements and low slippage requirements; it was clarified that dynamic requirements were the main control objectives
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Fabrication of polyvinyl alcohol based fast dissolving oral strips of sumatriptan succinate and metoclopramide HCL Sci. Progess (IF 1.906) Pub Date : 2020-11-05 Muhammad Zaman; Rabia Hassan; Sobia Razzaq; Asif Mahmood; Muhammad Wahab Amjad; Maria Abdul Ghafoor Raja; Asif Ali Qaisar; Abdul Majeed; Muhammad Hanif; Rana Azam Tahir
Migraine is a throbbing condition, usually associated with nausea and vomiting and requires concurrent administration of anti-migraine along with anti-emetic therapy. The current study was undertaken with an aim to fabricate fast dissolving oral strips (FDOSs) containing Sumatriptan succinate (anti-migraine) and Metoclopramide HCl (anti-emetic) in combination without involving any superdisintegrant
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Arming the troops: Post-translational modification of extracellular bacterial proteins Sci. Progess (IF 1.906) Pub Date : 2020-11-04 Suzanne Forrest; Martin Welch
Protein secretion is almost universally employed by bacteria. Some proteins are retained on the cell surface, whereas others are released into the extracellular milieu, often playing a key role in virulence. In this review, we discuss the diverse types and potential functions of post-translational modifications (PTMs) occurring to extracellular bacterial proteins.
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The usability of ventilator maintenance user interface: A comparative evaluation of user task performance, workload, and user experience Sci. Progess (IF 1.906) Pub Date : 2020-11-03 Mingyin Jiang; Dongjie Sun; Qiang Li; Daoxiong Wang
Poor usability designed of ventilator user interface can easily lead to human error. In this study, we evaluated the usability design of ventilator maintenance user interface and identified problems related to the usability of user interface that could easily cause human error. Sixteen respiratory therapists participated in this usability study. The usability of the ventilator maintenance user interface
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Stability control of in-wheel motor driven vehicle based on extension pattern recognition Sci. Progess (IF 1.906) Pub Date : 2020-10-28 Wang Hongbo; Sun Youding; Tan Hongliang; Lu Yongjie
According to the characteristics that the torque of each wheel of the in-wheel motor driven vehicle is independent and controllable, the stability control of in-wheel motor driven vehicle based on extension pattern recognition method is proposed in this paper. The dynamic model of the vehicle is established by Matlab/Simulink and Carsim. Taking two-degree-of-freedom (2-DOF) vehicle model as reference
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Numerical simulation of the influence of pipe length on explosion flame propagation in open-ended and close-ended pipes Sci. Progess (IF 1.906) Pub Date : 2020-10-23 Xue Li; Ning Zhou; Xuanya Liu; Weiqiu Huang; Bing Chen; Vamegh Rasouli
The pipeline length exerts great influence on flame propagation characteristics, Realizable k−ε model and Premixed combustion model were used to study the influence of pipe length on propane-air explosion flame in open-ended and close-ended pipes. Using the numerical model verified by experiments, the changes of flame structure and flame propagation speed are studied. The result showed that the Realizable
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Mechanical behavior and dynamic damage constitutive model of glass fiber-reinforced Vinyl Ester with different fiber contents Sci. Progess (IF 1.906) Pub Date : 2020-10-19 Feiya Duan; Runmei Zhang; Jingfa Lei; Tao Liu; Yan Xuan; Zhan Wei
Glass fiber-reinforced plastics (GFRP) based on polymer materials are widely used in lightweight impac-resistant structure design. In the process of design and development, it is very important to clarify the mechanical behavior under dynamic load to improve the product performance. Therefore, in this paper, Quasi-stati and dynamic compression behaviors of unidirectional continuous glass fiber-reinforced
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Mechanistic-empirical evaluation of specific polymer-modified asphalt binders effect on the rheological performance Sci. Progess (IF 1.906) Pub Date : 2020-10-16 Ghazi G Al-Khateeb; Waleed Zeiada; Mohammed Ismail; Ahmad Shabib; Adel Tayara
Major distresses such as rutting, fatigue, and thermal cracking are facing asphalt pavement structures due to continuous heavy traffic loading and climate change. The modification of asphalt binders (one of the main components of the asphalt paving mix) has the potential to mitigate distresses through using different additives. Polymer modified asphalt (PMA) binders showed a noticeable resistance to
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Optimization and analysis of a grounded type dynamic vibration absorber with lever component Sci. Progess (IF 1.906) Pub Date : 2020-10-13 Yongjun Shen; Zikang Xing; Shaopu Yang; Xianghong Li
Dynamic vibration absorber (DVA) with large auxiliary mass has better control performance, but it is also more bulky. Therefore, the mass ratio (the ratio of auxiliary mass of DVA to mass of controlled object) is usually limited to make the DVA easy to install and suitable for engineering practice. In this paper a grounded type DVA with lever component is proposed, which aims to increase the effective
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A new method for cylindricity error evaluation based on increment-simplex algorithm Sci. Progess (IF 1.906) Pub Date : 2020-10-08 Dongliang Liu; Peng Zheng; Jianghao Wu; Haotian Yin; Linna Zhang
A geometric error determines the quality and function of a product to a certain extent. Cylindricity error is an important indicator of the geometric error of form parts. In recent years, with the development of geometric product verification and specification (GPS), the specification of the cylindricity error and high-precision detection have become the focus in the field of industrial metrology.
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Tolerance analysis for automobile transmission shaft based on minimum cost and reliability target Sci. Progess (IF 1.906) Pub Date : 2020-10-07 Jiao Luo; Xintian Liu; Haijie Wang; Xueguang Yu; Xiaobing Yang
To design a reasonable dimensional tolerance of a transmission shaft, the higher product quality while lower manufacturing cost must be considered. This paper provides a mathematical model and a flowchart which elucidates the relationship between process capability index (PCI), reliability, tolerance and manufacturing cost, considering the characteristics of the shaft diameter, the material and manufacturing
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Spontaneous colonic perforation in adults: Evaluation of a pooled case series Sci. Progess (IF 1.906) Pub Date : 2020-09-30 Ren Chongxi; Ji Jinggang; Shi Yan; Wang Hongqiao; Liu Yan; Yang Fengshuo
Spontaneous colonic perforation in adults (SCPA) is rare but important. Its clinicopathological features and outcomes remain unclear. Therefore, the aim of the current study was to explore and investigate the clinicopathological characteristics, clinical outcomes and potential risk factors for patients with SCPA. Data of seven patients with SCPA treated in our hospitals from January 2008 to December
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A transformed proportional-integral-derivative controller for a multi-vectored propeller aerostat with independent actuator magnitude and rate saturations. Sci. Progess (IF 1.906) Pub Date : 2020-09-28 Li Chen,Yuxiang Deng,Qiyuan Gao,Jinguo Liu
The problem of designing a controller for a multi-vectored propeller airship with independent amplitude and rate saturations is addressed. First, a linear Proportional-Integral-Derivative (PID) controller is introduced for position control without considering the input saturations. Then, two design methods are applied to the traditional PID control output to satisfy the independent amplitude and rate
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Development of an early warning system for loose automobile tires. Sci. Progess (IF 1.906) Pub Date : 2020-09-22 Huibo Wu,Fei Song,Kainan Wu,Cheng Chen,Xiaohua Wang
The looseness of tires or even falling off from cars will lead to serious traffic accidents. Once it occurs, it will bring casualties and huge economic losses to society, seriously affecting the traffic safety. To mitigate such possible safety concerns, an early loosening warning system is developed in this article. The system consists of the tire monitoring module and the working control module. The
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Modeling and detection of the prepared tool edge radius. Sci. Progess (IF 1.906) Pub Date : 2020-09-21 Zhao Xuefeng,Li Hui,He Lin,Tao Meng
Introduction: High-speed and high-efficient machining is the inevitable development direction of machining technology. The tool edge preparation can improve the life, cutting performance, and surface quality of a tool and help to achieve high-speed and efficient machining. Therefore, precise modeling and detection of the micron-level contour of a tool edge are crucial for edge preparation. The aim
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Numerical study for removing wax deposition by thermal washing for the waxy crude oil gathering pipeline. Sci. Progess (IF 1.906) Pub Date : 2020-09-21 Hui Jiang,Xiaoyan Liu,Haiqian Zhao,Yang Liu,Chuan Ma,Xiaoqing Li
Exploring the wax removal process by numerical simulation is beneficial for guiding field operations. In this paper, enthalpy-porosity and volume of fluid (VOF) methods were adopted to simulate the melting process of wax in the crude oil gathering pipeline. The melting patterns and liquid fraction of the wax were used to validate the mathematical model. The results show that the wax melts quickly before
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Numerical modeling and experimental testing analysis of Assembled Rubber Metal Isolator. Sci. Progess (IF 1.906) Pub Date : 2020-09-18 Jida Wu,Chusheng Liu,Haishen Jiang,Zhenqian Wang
In order to analyze the stiffness characteristics of Assembled Rubber Metal Isolator (ARMI) more accurately, the present work elaborates on the detailed numerical modeling and analysis process of the ARMI, considering prestressing condition. By comparing the applicability of different constitutive models, the reasonable parameters of the proposed Money-Revlon constitutive model were determined by rubber
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Frequency spectrum and fatigue analysis of T-bolt fracture in DT III fastener based on Refined Model. Sci. Progess (IF 1.906) Pub Date : 2020-09-16 Xiao Hong,Wang Jiaqi,Zhang Moyan,Liu Guangpeng,Mahantesh M Nadakatti
It is observed that T-bolt fracture of DT III fastener affects the safety of railway operations. The present study is aimed at finding solution to this critical issue of DT III T-bolt fracture. The paper is based on outcomes of field studies and analysis of relationship between bolt installation torque and stress. A refined DT III fastener model is established based on test data and nonlinear contact
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Influence of orifice geometry on atomization characteristics of pressure swirl atomizer. Sci. Progess (IF 1.906) Pub Date : 2020-09-16 Huilong Zheng,Zhaomiao Liu,Kaifeng Wang,Jiayuan Lin,Zexuan Li
The spray characteristics of the pressure swirl nozzle are experimentally studied using particle dynamics analysis (PDA) and high-speed photography system in this paper, specifically focusing on the dependence of geometrical dimensions of orifice on the spray SMD, velocity magnitude and droplet distribution, and the spray cone angle. It is indicated that the increase of orifice diameter makes the initial
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Experimental investigation of the tip leakage flow in a low-speed multistage axial compressor. Sci. Progess (IF 1.906) Pub Date : 2020-09-16 Jun Li,Jun Hu,Chenkai Zhang
Casing pressure measurements and Stereoscopic Particle-Image Velocimetry (SPIV) measurements are used together to characterize the behavior of the rotor tip leakage flow at both the design and near-stall conditions in a low-speed multistage axial compressor. A three-dimensional Navier-Stokes solver is also performed for the multistage compressor and the prediction of tip leakage flow is compared with
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Trajectory tracking control of 7-DOF redundant robot based on estimation of intention in physical human-robot interaction. Sci. Progess (IF 1.906) Pub Date : 2020-09-14 Lan Ye,Genliang Xiong,Cheng Zeng,Hua Zhang
Collaborative robot has been widespread application prospect, such as homes, manufacturing, and health-care etc. In physical human-robot interaction, the external force appears inevitably in contact with environment or human, especially the interactive tasks such as trajectory tracking requirements and force compliance control. In this article, a method based on interaction intention estimation, which
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An optimization study of polishing efficiency of blisk and its technological parameters. Sci. Progess (IF 1.906) Pub Date : 2020-09-14 Wenbo Huai,Xiaojun Lin
When applied to blisk blade profile polishing of aero-engines, “five-axis NC + flexible grinding head + elastic grindstone” polishing technological equipment has advantages of high precision, minor interference, favorable adaptivity, etc. In order to improve the polishing quality and polishing efficiency, a mathematical calculation formula of polishing efficiency was established according to the polishing
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Experimental study on the seismic behavior of concentrically braced steel frames with extended end-plate bolted connections. Sci. Progess (IF 1.906) Pub Date : 2020-09-11 Yang Rongqian,Zhou Xuejun
The prefabricated semi-rigid concentrically braced steel frame has always been the main form of residential steel structures, much work so far has focused on the earthquake-resistance performance of such structures. However, little attention has been devoted to systematic model testing, further effort is still required to explore the structural performance with experimental studies. Two semi-rigid
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Resonant Suppression Method Based on PI control for Serial Manipulator Servo Drive System. Sci. Progess (IF 1.906) Pub Date : 2020-09-09 Xiaopeng Li,Dongyang Shang,Haiyang Li,Fanjie Li
A typical serial manipulator consists of a servo motor, a serial mechanism and an independent joint placed between the motor and the serial mechanism. Both the time-varying characteristics of the inertia of the serial mechanism and the flexibility characteristics of the independent joint are widely found in serial manipulator servo drive systems. These two characteristics not only increase the resonance
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Optimization method of fatigue maintenance for cable-beam anchorage zone of suspension bridge. Sci. Progess (IF 1.906) Pub Date : 2020-09-09 Hongmei Tan,Yong Zeng,Qianping Zhang
The cable-beam anchorage zone is the vital load-bearing component in suspension bridge. For maintenance of such structure, a method of probabilistic optimization was proposed by combining linear elastic fracture mechanics, structural reliability and life cycle cost analysis. In this method, the optimal maintenance time is obtained by determining the relative proportion between the costs under the condition
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Shape optimization of a blended-wing-body underwater glider using surrogate-based global optimization method IESGO-HSR. Sci. Progess (IF 1.906) Pub Date : 2020-09-09 Pengcheng Ye,Guang Pan
As a novel flying-wing configuration underwater glider, the blended-wing-body underwater glider (BWBUG) has the satisfactory hydrodynamic performance in comparison to the conventional cylindrical autonomous underwater gliders (AUGs). The complicated shape optimization of BWBUG is significant for improving its hydrodynamic efficiency while it has to require huge computation time and efforts. A novel
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An efficient multi-factor geometry optimization based on motion analysis and resonance response for hinged double-body floating wave energy converter. Sci. Progess (IF 1.906) Pub Date : 2020-09-09 Biao Li,Fangfang Sui,Bingsong Yang
In the practical engineering applications of multi-body floating wave energy converter (WEC), the traditional geometric optimization is always expensive and time-consuming. This study aim to propose a more efficient geometry optimization strategy with a hinged double-body floating WEC as the study object. The influences of geometric parameters of the buoys on the pitching motion and energy conversion
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Dynamic characteristic analysis of vertical screw conveyor in variable screw section condition. Sci. Progess (IF 1.906) Pub Date : 2020-09-09 Jianming Yuan,Mingzhi Li,Fangping Ye,Zhenhui Zhou
Vertical screw conveyors are used widely in industry for elevating bulk materials over relatively short distances, but the problem of insufficient feeding and low conveying efficiency always exist in the vertical conveying process. In this paper, a vertical screw conveyor with variable screw section is presented, and the characteristics of vertical screw conveyor are investigated under the variable
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Corrigendum. Sci. Progess (IF 1.906) Pub Date : 2020-09-09
Corrigendum to Locating Gaps in the California Current Ocean Acidification Monitoring Network. Sci Prog 103(3): 1–27. DOI: 10.1177/0036850420936204
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Pulse-heating infrared thermography inspection of bonding defects on carbon fiber reinforced polymer composites. Sci. Progess (IF 1.906) Pub Date : 2020-09-07 Bo Wen,Zhenwei Zhou,Bin Zeng,Caiqian Yang,Da Fang,Qing Xu,Yanchao Shao,Chunfeng Wan
Non-destructive analysis of fiber reinforced polymer (FRP) composites is important for confirming the long-term safety and durability of concrete structures. In this study, a pulse-heating infrared thermography technique was used to detect and characterize bonding defects of externally bonded carbon fiber reinforced polymers (CFRP) on concrete surface structures. The CFRP composite contains various
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Design and performance analysis of a new optimization algorithm based on Finite Element Analysis. Sci. Progess (IF 1.906) Pub Date : 2020-09-07 Zhiqiang Ning,Youshan Gao,Aihong Wang
Aiming at the problem that many algorithms could not effectively balance the global search ability and local search ability, a new optimization algorithm is proposed. Inspired by Finite Element Analysis (FEA) approach, a relationship of mapping between Finite Element Analysis approach and a population-based optimization algorithm is constructed through comparing the similarities and differences of
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Model predictive control of steering torque in shared driving of autonomous vehicles. Sci. Progess (IF 1.906) Pub Date : 2020-09-04 Chunjiang Bao,Jiwei Feng,Jian Wu,Shifu Liu,Guangfei Xu,Haizhu Xu
The current path tracking control method is usually based on the steering wheel angle loop, which often makes the driver lose control of the automatic driving control loop. In order to involve the driver in the automatic driving control loop, and to solve the vehicle path tracking control problem with system robustness and model uncertainty, this paper puts forward a steering torque control method
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Optimal control for hybrid magnetically suspended flywheel rotor based on state feedback exact linearization model. Sci. Progess (IF 1.906) Pub Date : 2020-09-04 Tong Wen,Biao Xiang,Shilei Zhang
For a hybrid magnetically suspended flywheel (MSFW) rotor suspended by permanent magnet biased active magnetic bearing (AMB) and passive magnetic bearing (PMB), the dynamic functions are nonlinear and coupling among different degrees of freedom (DOFs). In this article, the nonlinear dynamic functions in two controllable DOFs of the hybrid MSFW rotor are developed based on the equivalent magnetic circuit
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Wear analysis of finger locks with different design parameters for landing gear. Sci. Progess (IF 1.906) Pub Date : 2020-09-03 Yu Hou,Ming Zhang,Hong Nie
The finger lock in the retractable actuator of the landing gear will wear during repeated unlocking and locking. Therefore, the effects of six parameters including the material of the finger lock, the length of the finger lock, the diameter of the finger lock, the number of petals, and the angle of the fingertip on the unlocking force after 500 unlocking cycles are researched. Archard wear theory was
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Research on the dynamic heat transfer of stratified air conditioning zone building surfaces in large space scale rig based on low supply-middle return. Sci. Progess (IF 1.906) Pub Date : 2020-09-03 Liugen Lv,Yiying Luo,Yi Xiang,Xiangjiang Zhou,Chen Huang
Radiation heat and convection heat exist on stratified air conditioning zone building surfaces in large space, and they have significant impact on cooling load calculation and thermal comfort analysis. Actually, heat transfer in large space is usually under non-steady condition. Based on an actual large space, a 1:4 scale model experiment rig is built as research object, which has: typical sloping
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Application of a new one-dimensional deep convolutional neural network for intelligent fault diagnosis of rolling bearings. Sci. Progess (IF 1.906) Pub Date : 2020-09-03 Shenglong Xie,Guoying Ren,Junjiang Zhu
As one of the key parts of rotary machine, the fault diagnosis and running condition monitoring of rolling bearings are of great importance for normal working and safe production of rotary machine. However, the traditional diagnosis approaches merely count on artificial feature extraction and domain expertise. Meanwhile, the existing convolutional neural networks (CNNs) have the problem of low fault
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