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Identification of real translational and rotational displacements of six-axial shakers with only six measured linear accelerations
Mechanical Systems and Signal Processing ( IF 7.9 ) Pub Date : 2021-01-11 , DOI: 10.1016/j.ymssp.2020.107584
Yvon Briend , Eric Chatelet , Régis Dufour , Franck Legrand , Sophie Baudin

Qualification tests on the vibrations of on-board equipment depend on the ability of the shaker used to reproduce as precisely as possible the excitation profiles stipulated by standards, given that real operational conditions are generally multiaxial. Using a set of six measured linear accelerations the original method proposed permits determining real six-axial shaker displacements combining three translations and three rotations. Thus, this method, named REDEAT (REal Displacement from Experimental Acceleration with inverse Technique), is useful for introducing these real displacements in the numerical simulation in view of experimentally validating the dynamic behavior model of on-board equipment. Moreover, the REDEAT method evaluates the deviation between real and intended forced displacements. Its principle resides in solving a system of nonlinear time-differential equations expressed, by resorting to numerical integration combining Newmark and Newton–Raphson schemes. In order to overcome the classical divergence issue inherent to the use of numerical integration, data processing tools are employed, consisting of the application of successive high pass filters and window functions. The REDEAT method is applied to a hydraulic 6-DOF shaker equipped with accelerometers and gyroscopes, through a combination of two harmonic rotations and a full 6-DOF random motion. In addition, the influence of the method’s parameters and of the six input accelerograms chosen from twelve is investigated.



中文翻译:

仅用六个测得的线性加速度识别六轴振动器的实际平移和旋转位移

鉴于实际操作条件通常是多轴的,因此对车载设备振动的资格测试取决于用于精确地复制标准规定的激励曲线的振动器的能力。使用一组六个测量的线性加速度,提出的原始方法允许确定结合了三个平移和三个旋转的实际六轴振动器位移。因此,鉴于实验上验证了车载设备的动态行为模型,该方法被称为REDEAT(采用逆向技术从实验加速度引起的实际位移),可用于将这些实际位移引入数值模拟中。此外,REDEAT方法可评估实际位移与预期位移之间的偏差。它的原理在于通过采用结合了Newmark和Newton-Raphson方案的数值积分来求解所表达的非线性时微方程组。为了克服数值积分所固有的经典分歧问题,采用了数据处理工具,其中包括连续高通滤波器和窗口函数的应用。REDEAT方法通过两个谐波旋转和完整的6自由度随机运动的组合,应用于配备了加速度计和陀螺仪的液压6自由度振动筛。此外,还研究了该方法的参数以及从十二个输入中选择的六个输入加速度图的影响。为了克服数值积分所固有的经典分歧问题,采用了数据处理工具,其中包括连续高通滤波器和窗口函数的应用。REDEAT方法通过两个谐波旋转和完整的6自由度随机运动的组合,应用于配备了加速度计和陀螺仪的液压6自由度振动筛。此外,还研究了该方法的参数以及从十二个输入中选择的六个输入加速度图的影响。为了克服数值积分所固有的经典分歧问题,采用了数据处理工具,其中包括连续高通滤波器和窗口函数的应用。REDEAT方法通过两个谐波旋转和完整的6自由度随机运动的组合,应用于配备了加速度计和陀螺仪的液压6自由度振动筛。此外,还研究了该方法的参数以及从十二个输入中选择的六个输入加速度图的影响。通过两个谐波旋转和完整的6自由度随机运动的组合来实现。此外,还研究了该方法的参数以及从十二个输入中选择的六个输入加速度图的影响。通过两个谐波旋转和完整的6自由度随机运动的组合来实现。此外,还研究了该方法的参数以及从十二个输入中选择的六个输入加速度图的影响。

更新日期:2021-01-11
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