In this article, a vertical rigid–flexible coupling model between the vehicle and the equipment is established. Considering the series stiffness of hydraulic shock absorbers, the underframe equipment is like a three-element-type Maxwell model dynamic vibration absorber. The carbody is approximated by an elastic beam and the three-element-type dynamic vibration absorber for general beam system was studied

Given that the cable harness wiring quality (CHWQ) of complex mechatronic products is affected by multiple factors and it is difficult to solve the resulting control problems, this paper proposes a quality prediction method for cable harness wiring using extension theory and a backpropagation (BP) neural network. First, a quality prediction framework is designed based on the factors influencing the

Ti(C,N)-TiB2-Co cermets were in situ synthesized, via reactive hot pressing from the Co-Ti-C-BN system, with a Co content ranging from 6 to 22 wt%. The microstructure, relative density, hardness, and fracture toughness of the sintered compacts was investigated by light microscopy, scanning electron microscopy, ceramic densitometry, and Vickers hardness test. The investigations indicate that during

304 stainless steels were prepared by aluminothermic reaction method; first steels are annealed at 1000°C and then rolled at 700°C for different deformation. The microstructures evolution and mechanical properties were distinguished in details. It was found that the steel contains nanocrystalline/submicrocrystalline/microcrystalline austenite and submicrocrystalline ferrite. After rolling to a thickness

A six-wheel vehicle chassis scheme with a variable wheelbase is proposed to improve the lateral dynamic performance of vehicles. The yaw moment is varied by changing the wheelbase to enhance the lateral dynamic performance of the vehicle. A vehicle lateral dynamics model is established using this approach. The effects of the wheelbase variation on the lateral yaw rate gain, steering stability, and

Bearings are the core components of ship propulsion shafting, and effective prediction of their working condition is crucial for reliable operation of the shaft system. Shafting vibration signals can accurately represent the running condition of bearings. Therefore, in this article, we propose a new model that can reliably predict the vibration signal of bearings. The proposed method is a combination

The difficulty of knowing the real-time status of gas face seals is the main cause of common problems, including sudden failure, ineffective diagnosis, and unpredictability of service life. This study analyzed the acoustic emission signals generated from experiments, uncovering their features in terms of the frequency distribution, periodic fluctuations, and the behaviors during different operation

Gear pump is the key component in hydraulic drive system, and it is very significant to fault diagnosis for gear pump. The combination of sparsity empirical wavelet transform and adaptive dynamic least squares support vector machine is proposed for fault diagnosis of gear pump in this article. Sparsity empirical wavelet transform is used to obtain the features of the vibrational signal of gear pump

In this study, the seismic response of the anchorage used for switchboard cabinets at a power plant was presented based on the results of an experiment and numerical simulations. In the experimental study, shaking table tests were performed to investigate the overall structural behavior of switchboard cabinets. The finite element modeling was conducted using the ABAQUS program, and in order to validate

To guarantee rescue time and reduce medical accidents, a health degradation prediction model of medical lithium-ion batteries based on multi-scale deep neural network was proposed aiming at the problems of poor model adaptability and inaccurate prediction in current state of health prediction methods. The collected energy data of medical lithium-ion batteries were decomposed into main trend data and

This study conducted an investigation on transverse quasi-static three-point loading on a circular aluminum tube and its characteristic plastic failure and energy-absorption behaviors. The thin wall thickness of the aluminum tube, the various diameter and thickness ratios (D/t) of the tube, and the tube length are important control parameters. Experimental data for different span length and thickness

Horizontal impact tests of stainless steel–reinforced concrete piers with different reinforcement ratios at different impact velocities were carried out by using the ultra-high drop weight impact test system. Degree of piers damage after impact was comprehensively analyzed by measuring the acceleration of the impact body, the displacement of the top of the pier specimens, the strain of the steel bars

An incompressible, electrically conducting, bioconvective micropolar fluid flow between two stretchable disks is inspected. Modification versions of Fourier and Fick’s law are accounted through Cattaneo–Christov heat–mass theories. The nanofluid Buongiorno model is also utilized in constitutive equations. The influence of gyrotactic microorganism is also accounted through bioconvection. Similarity

Overview of the ISIS Neutron and Muon Source facilities, Rutherford Appleton Laboratory, STFC, UK (courtesy of Tung-Lik Lee, STFC)

For hard rock drilling in coal mine, the drilling efficiency and service life of polycrystalline diamond compact bit are very low. To overcome these shortcomings, the bionic technology is applied to the design and processing of polycrystalline diamond compact bit. The bit body and polycrystalline diamond compact cutter are designed as bionic structures, and the test of the bionic polycrystalline diamond

The water-meter shell has a complex-structured thin-walled cavity, and it can cause casting defects such as shrinkage and misrun. On the basis of structural analysis of a water-meter shell, a three-dimensional model and a finite element model of the water-meter shell were constructed using the SOLIDWORKS and ProCAST software as a modeling tool and a casting numerical simulation tool, respectively.

The performance of the real-time dynamic force and torque compensation, flexible force interactive control, and the ability to compensate for the defect of the passive rehabilitation training are the important functions within the rehabilitation robot design process. In this investigation, the upper limb rehabilitation robot is designed, and the force sensor is used to measure the joint feedback torque

Today’s society is becoming aware that a new economic model of production and consumption must take into account its environmental and social impact. Industries are under increasing pressure from stakeholders to be transparent in reporting the environmental and social impacts of their operations. In this context, sustainable manufacturing must minimize negative environmental impacts and consumption

The Miller cycle has been proven to be an effective way to improve the thermal efficiency for gasoline engines. However, it may show insufficient power performance at certain loads. In this study, the objective is to exploit the advantages of the Miller-cycle engines over the original Otto-cycle engines. Therefore, a new camshaft profile with early intake valve closure was devised, and two various

The field of electronic device applications is becoming more and more extensive. With the development of science and technology and the improvement of the integration of electronic components, local heating is becoming more and more serious. If heat cannot be discharged immediately, it will cause heat to accumulate, causing the temperature of each component to exceed the limit. The reliability of electronic

The matching of constraint between laboratory specimens and actual cracked structures is a key problem of the accurate structure integrity assessment. Different laboratory specimens and the steam turbine blade with different constraints were selected, the matching of constraint between steam turbine blade and laboratory specimens was investigated. The results shown that the steam turbine blade with

Micro-cantilever has shown wide application prospect in the field of micro-sensors, actuators, gyroscope, and so on. There are abundant research studies on simple cantilever beam models, but there are few on S-shaped folding cantilever with complex structure, although it is widely used. In order to study the deformation failure of S-shaped folding cantilever, the force analysis of S-shaped folding

Dynamic brake characteristics of disc brake during emergency braking of the kilometer deep coal mine hoist were investigated in the present study. The theoretical model of dynamic brake torque of disc brake during emergency braking was given to explore dynamic brake torque properties of disc brake. The three-dimensional thermo-mechanical coupled finite element model of brake disc–brake shoe was established

The seal is the key part of the cone bit. To reduce the failure probability, a new seal was designed and studied. The sealing performance and structure optimization of the X-O composite seal was analyzed and compared by finite-element analysis. The stress and contact pressure were analyzed to establish the main structural parameters that affect sealing performance and the direction of the structural

Recent development in the predictive maintenance field has focused on incorporating artificial intelligence techniques in the monitoring and prognostics of machine health. The current predictive maintenance applications in manufacturing are now more dependent on data-driven Machine Learning algorithms requiring an intelligent and effective analysis of a large amount of historical and real-time data

In this article, a fluid–solid coupling analysis of tripod sliding universal coupling and lubricating oil film was conducted by taking into consideration cavitation and thermal effects. The coupling of the sleeve and slip pin with the lubricant oil film under different pressure differences and frequencies was investigated. Moreover, the study results were compared with the results of fluid–solid coupling

The oil film among meshing teeth is just like a spring-damping element, and it can dominate the friction and meshing characteristics of the gear pair and influence its dynamic performances further. Thus, this article focuses on a double-helical gear system and makes efforts to consider the effect of the oil film among meshing teeth more deeply, which can enhance the precision of dynamic analysis for

The splitter blade can effectively optimize pump performance, but there is still insufficient research in blood pumps that cover both hydraulic and hemolysis performance. Thus, the aim of this study was to investigate the effect of key factors related to splitter blade on the performance and flow field of axial flow blood pump. In this study, the number of splitter blades, the axial length, and the

The axial compressive experiments were carried out on 21 welded composite T-shaped concrete-filled steel tubular columns, and 395 finite element models were established for parameter calculation. The calculating formula of axial compressive bearing capacity of welded composite T-shaped concrete-filled steel tubular columns is established. The results show that three typical failure modes were found:

In the present research work, a finite element model of the electro-resistance welding pipe forming process chain is developed using the ABAQUS/Explicit software. The forming process, which is composed of 22 tandem roll stations, has been fully modeled in the developed finite element simulation. In order to account for the Bauschinger effect on the pipe material properties as a consequence of the loading

GH536 has been widely employed as one kind of high-performance materials; however, the poor machinability of GH536 especially substantial tool wear can still be considered as a problem. On the contrary, deep cryogenic treatment can be considered as an effective heat treatment to improve the milling cutter performances. Considering few studies that investigated the deep cryogenic treatment of the WC-Co

The concentration of wear debris in used lubricating oil is generally observed from spectral oil analysis. The element concentration data are one of the commonly used oil field data for degradation evaluation of power-shift steering transmission. However, in practical applications, the underlying degradation degree of the power-shift steering transmission is difficult to evaluate due to the complexity

Small turbines must operate at high rotational speeds to generate adequate output power. In this study, a radial inflow turbine using R245fa as the working fluid is miniaturised and is designed to have a rotational speed of 30,000 r/min. The organic Rankine cycle system is not simplified, and a preheater and a superheater are installed. The turbine is experimentally analysed in the organic Rankine

In this article, flexural vibration and its power flow of an axially loaded beam with arbitrary boundary and non-uniform elastic foundation are analyzed via energy principle in conjunction with Rayleigh–Ritz procedure. A general solution is assumed as a modified version of Fourier series supplemented with boundary-smoothing auxiliary terms. Effects of axial load and elastic foundation of the beam are

Targeting to improve the calculation efficiency of the finite element simulation, we introduce the back propagation neural network–based machine learning method to carry out the inversion prediction framework. The inversion collision model is established based on the inversion prediction framework. Then, the prediction results are compared with the finite element simulation results of the anti-climbing

This article studies the flow trajectories and the wear law of sediment particles in a pump considering multiple variables, such as sediment concentration, particle size, and cavitation stage. In addition, the mechanism of joint effects of cavitation and sediment wear of the axial-flow pump is explored. In this work, the characteristics of cavitation and sediment wear in an axial-flow pump are investigated

Tool wear is the phenomenon of the gradual deterioration of cutting tools due to regular operation. It is a significant topic of interest for manufacturing industries, as they need to utilize the full potential of each cutting tool, thus increasing their productivity.1 Predicting tool wear level is also crucial to industry,2 as it can be used to give information on the remaining service life of the

Planetary gear reducer is widely used. As the power output terminal, planetary carrier has better load-bearing performance, higher hardness of tooth surface, high reliability, and high transmission efficiency,1 but it has a high failure rate in the process it is being used. The interference fit is often used between the planetary frame and the planetary wheel axle. The elastic deformation between the

In comparison with tracked vehicles, wheeled vehicles have such advantages as fast speed, high mobility, long running distance, low price, and convenient maintenance, but with low cross-country power and large turning radius as their weaknesses. Tracked vehicles are mostly military, for example, armored cars and tanks. Wheeled vehicles are the foremost type of civilian vehicle (e.g. cars and trucks)

Gears are often the heart of a wide range of rotating machines. They have a vital role in transmitting power and motion from one shaft to another. However, due to the high load and difficult working conditions, gears are exposed to failures and defects. A sudden gear malfunction may decrease the performance of the entire industrial mechanism and may even lead to fatal breakdown. Therefore, it is imperative

With the advancement of technology, the gear system is one of the most important components and commonly used in many industrial applications, such as automotive, wind turbines, aircraft, generator, and robotic arms. Generally, improvements in the rotational speed and efficiency of such machinery may cause problems such as noise and vibration. In recent years, gear systems are becoming more and more

Olive oil production is widespread throughout the Mediterranean region and in the Middle East. Over the last few years, Tunisia has become the world’s second-largest producer1 and exporter2,3 of olive oil after Spain. Thus, the olive oil industry plays a key factor in its economic, environment, and social life. However, olive oil extraction processes, either traditional press extraction or continuous

Casing eccentricity is the necessary prerequisite and important condition to improve cementing quality for high-pressure, high-temperature (HPHT) wells in unconventional oil and gas fields and hot dry rock fields. So, the casing must be placed in the center of the wellbore through some centralizers. However, due to the change of well trajectory angle, improper arrangement of casing centralizer, the

With the construction and operation of high-speed railway and municipal subway, China has achieved rapid progress in hydraulic tunnel, municipal tunnel, railway tunnel, and underground engineering, which has made China one of the countries with the fastest development, the largest number, and the most complex technical conditions of tunnel engineering in the world.1 However, due to the complex and

Rolling-element bearings are a key component in rotating machinery1 such as turbomachinery, electric motors, machine tools and gearboxes. In recent years, the use of such bearings has increased dramatically, yet bearing failure has impacted negatively the maintenance of machinery and has increased downtime costs.1–3 Unsurprisingly, there is considerable interest in developing more effective techniques

The increasing contribution of renewable energy sources like solar energy in power cycles mandates the use of thermal energy storage (TES) systems to solve the problem of the intermittent character of solar energy. By storing excessive unused energy and supplying it back when required, TES technologies help in balancing the energy generation and demand. Using an appropriate TES system can enhance the

The formation of hull shells, especially of large curved shells, has always been a most difficult problem in the field of plastic hull processing. The simple and effective shaping of ship plates with different thicknesses and curvatures to meet design requirements has always been the development direction of hull plate-forming technology. For a long time, two-dimensional parts, such as cylindrical

Because of many uses in the fields of engineering, manufacturing, and biology, the study of non-Newtonian fluids has become significant in recent years. Such applications include industries such as meat, product processing, and cosmetics.1 The equations governing non-Newtonian fluids are very nonlinear because of the complex geometry. The empirical equations that determine the non-Newtonian fluid’s

Nowadays, composite materials have been applied extensively in many industrial fields such as aerospace, chemistry, automobile, sport apparatus, and medical instruments, attributing their high specific strength and stiffness, good fatigue and corrosion resistance, and property designability. These merits make them occupy a superiority position in competing against conventional materials. The laminated

Endwall loss, also known as secondary flow loss, is one of the main energy losses of the turbine cascade. It contributes significant amount 33% to overall losses of the impeller mechanical turbine cascade.1 Scholars have done extensive research on the loss mechanism of secondary flow, and proposed the Langston model,2 the Sharma–Butler model,3 the Goldstein–Spores model,4 and the Wang Hai-Pin model

Lubrication of sliding friction surfaces is meaningful for the normal operation and longevity of various mechanical systems such as automobile engine, sliding bearing, and machine tool guideways.1 Reducing friction and wear of sliding contacts is considered to be necessary to save energy and avoid mechanical failure of components. Surface texturing is a novel technology to reduce friction and wear

Computer numerical control (CNC) machine tools are the key basic equipment of equipment manufacturing industry. With the continuous improvement of industrialization level, people put forward higher and higher requirements on the diversification and personalization of CNC machine tool products. The cycle of replacement of CNC machine tools is also shorter and shorter. On the other hand, with the increasingly

In engineering applications, uncertainties exist in many problems. For example, machining errors in mechanism links lead to uncertainties; internal defects of material lead to uncertainties of physical parameters; and external environment leads to load uncertainties. Under the influence of these uncertain factors, many problems’ output also becomes uncertain. Considering its significance to engineering

Lately, electricity has become part of basic mankind needs, but due to the high rising price and environmental hazards of the known energy sources such as large hydropower, oil, and coal production. This situation has limited the access of electricity to some regions of the world, especially in Africa and Asia. The International Monetary Fund (IMF)1 with its primary commodity price projections stated

Porous honeycomb materials have been widely applied in the field of aviation, construction, and packaging due to their superior properties such as lightweight, high strength, and strong energy absorption ability. Bearing and cushioning performance of honeycomb paperboard was the hotspot not only in the domestic but also in the international research field over the years.

Synchronous hydraulic motors are widely used in large-load, multi-cylinder hydraulic synchronization systems to provide pressure and flow to power components. Given that synchronous hydraulic motors typically operate under heavy loads and harsh conditions, their failure can result in economic loss or even serious safety incidents. Thus, fault diagnosis of synchronous hydraulic motors is urgently needed

Vibration phenomena requiring understanding of fully coupled fluid–structure systems, including fluid-conveying tubes, pipes, and so on, are a dynamic type of problem that have been investigated by numerous authors. The first serious research papers on fluid- conveying tubes, or the pipes vibration phenomena, started to appear in the 1960s, see, for example, Paidoussis.1,2 The first paper on transient

In hydraulic control valves, to achieve the performance of good sealing, fast response, large flow, and strong anti-pollution ability, pilot and control stages are commonly designed to conical structures. The valve core combined with a spring is usually used as an automatic valve, the static and dynamic forces act on the valve while it is used to regulate the flow during the startup and shut down operation

Composite materials/structures are advancing in product efficiency, cost-effectiveness and the development of superior specific properties (strength and modulus). There are increasing demands in their applications to load-bearing structures in aerospace, wind turbines, transportation, medical equipment and so on.1 Manufacturing of composite materials is a multivariable task, involving many procedures

With the advance of science and technology, unmanned underwater vehicle (UUV) has been widely used in areas such as underwater detection, oceanographic surveys, and undersea rescues.1–3 However, the vibrations of the propeller that is excited by water wave affect the dynamic performance of the UUV seriously.