共查询到18条相似文献,搜索用时 125 毫秒
1.
针对质量线法难以快速精确获取大型复杂构件质量的问题,根据振动微分方程和刚体加速度变换关系,推导出频响函数与质量转化的表达式,结合几何中心对称和力矩平衡的原理,提出基于频响函数的惯性参数识别改进方法。联合Adams与Hypermesh建立驾驶室和发动机总成的仿真模型,筛选振动试验获取的频响函数以识别质量,分析该方法结合质量线法识别结果的误差。通过模态试验得到简单构件和某型号卡车驾驶室总成的惯性参数,将其与MPC转动惯量平台测试的结果对比,验证该方法的工程测试精度。研究结果表明:刚体质量识别的仿真结果相对误差最大不超过0.4%,工程测量相对误差最大不超过4.6%,且该方法简单方便,降低测试成本,减小工作量,显著提高了惯性参数识别的效率。 相似文献
2.
汽车动力总成刚体惯性参数的辨识 总被引:1,自引:0,他引:1
本文以某动力总成为研究对象,基于试验模态分析方法进行了动力总成惯性参数辨识。首先给出了动力总成的频响函数及其拟合方法,并推导了动力总成表面响应和激励与坐标原点之间的关系,建立了动力总成运动学方程,进而得到了刚体惯性参数的表达式;然后以矩阵条件数的方法对动力总成模态试验过程中混入的干扰噪声进行了误差分析;基于测试点的矩阵条件数对响应点的位置进行了推导,并将其表达成与动力总成表面物理参数(如长度、面积等)有关的形式,从而得到了响应点的最好和最差布置形式以及最少的测试点数目;采用捶击法进行了动力总成模态试验,并以最小矩阵条件数原则进行了动力总成惯性参数的辨识。最后,本文也给出了关于进一步消除模态试验测量误差的一些措施。 相似文献
3.
4.
5.
6.
为快速精确获取刚性体惯性参数,对基于频响函数的刚性体惯性参数识别方法展开了研究。首先,对惯性参数识别算法进行了研究,并借助多体动力学仿真分析进行了验证;其次,深入分析了影响该识别方法精度的主要因素和影响规律,分析表明激励点和响应点的坐标误差以及激励方向对识别精度影响较大;最后,完成了惯性参数识别实验装置的设计,并进行实验研究。实验结果表明:刚体质量以及质心位置识别精度在4%以内,转动惯量以及惯性积识别精度均在10%以内,识别精度和效率满足工程实际需求。 相似文献
7.
以某混合动力客车的动力总成悬置系统为研究对象,对其参数进行匹配研究和试验验证.通过研究与试验表明,能量解耦法不能恰当反映长轴系或过定位动力总成悬置系统的动力特性.将较长的过定位动力总成系统分为2个刚体考虑,计算出合适的悬置刚度参数并制作了相应的样件进行试验,使动力总成悬置系统的动态特性达到较好的状态. 相似文献
8.
9.
传递路径分析(TPA)技术是基于频响函数(FRF)的一种故障诊断方法。此方法的模型中一般是把整个系统划分成几个较为独立的子结构,每个子结构都以频响函数来表征其结构特性,各子结构之间通过各种弹性元件相连接来传递信息。文中主要介绍TPA工况测量及结构声学传递函数测量,运用LMS TestLab对某动力总成进行贡献度分析,探寻动力总成悬置对车内噪音的贡献度。 相似文献
10.
11.
轿车整车转动惯性测试方法与误差分析 总被引:1,自引:0,他引:1
整车转动惯量在汽车操纵稳定性、制动性和行驶平顺性等汽车性能的计算机仿真中是重要的参数 ,文中介绍了自制转动惯量试验台将轿车整车假设为刚体进行转动惯量静态测试的方法 ,并对其进行误差分析 相似文献
12.
13.
Z.-Y. Yang T. Huang 《The International Journal of Advanced Manufacturing Technology》2006,31(5-6):621-628
Aimed at a parallel kinematic machine with three translational degrees of freedom, a method on the parameter identification and tuning of the electromechanical servo system is presented. At first, position, velocity and acceleration inverse solution models of a machine driven by the outer translation pairs that contain parallelogram strut structures are developed, and the inverse dynamics model of the rigid body has been set up by means of the virtual work principle. In the parameter identification process, the triangular-shaped input with variable frequency is adopted to overcome the disadvantages of a pseudo-random number sequence. Moreover, the rotary inertia of the motor can also be identified by the additive mass. Based on the above, making the mean square error of the trajectory of the moving platform as small as possible is the optimum goal, and considering the real-time variational inertial load along with its pose at the same time, the optimum range of PID parameters are given through simulations. Finally, the validity and effectiveness of the method are proved by the experiments. 相似文献
14.
《Mechanical Systems and Signal Processing》2003,17(1):65-72
This paper reports the procedure followed by the ‘LTAS-Vibrations et Identification des Structures’ research group to generate a low-order finite element (FE) model of the GARTEUR SM-AG19 structure. The model is made of beam elements, local inertia and rigid body elements. The philosophy of the updating method is first based on the correlation of the experimental data with the results of the FE model and on the localisation of errors in the model. Updating parameters are then selected using eigenvalue sensitivity and model error localisation analyses. After updating, the quality of the FE model is assessed in terms of accuracy of the response prediction to structural modifications. 相似文献
15.
Finite element analysis(FEA) and modal test are main methods to give the first-order vertical bending vibration frequency of train carbody at present, but they are inefficiency and waste plenty of time. Based on Timoshenko beam theory, the bending deformation, moment of inertia and shear deformation are considered. Carbody is divided into some parts with the same length, and it’s stiffness is calculated with series principle, it’s cross section area, moment of inertia and shear shape coefficient is equivalent by segment length, and the fimal corrected first-order vertical bending vibration frequency analytical formula is deduced. There are 6 simple carbodies and 1 real carbody as examples to test the formula, all analysis frequencies are very close to their FEA frequencies, and especially for the real carbody, the error between analysis and experiment frequency is 0.75%. Based on the analytic formula, sensitivity analysis of the real carbody’s design parameters is done, and some main parameters are found. The series principle of carbody stiffness is introduced into Timoshenko beam theory to deduce a formula, which can estimate the first-order vertical bending vibration frequency of carbody quickly without traditional FEA method and provide a reference to design engineers. 相似文献
16.
17.
为提高扭摆法测量大型回转体转动惯量的测量精度,克服线性转动惯量测量模型及周期法转动惯量计算的弊端,开展了基于希尔伯特-黄变换(HHT)的转动惯量测量技术研究。建立了考虑摩擦阻力矩的非线性转动惯量测量模型,在此基础上,通过经验模态分解提取了角位移主分量,利用希尔伯特变换识别了扭摆系统的瞬时阻尼系数和瞬时无阻尼固有频率,最后利用最小二乘法拟合得到非线性模型参数,精确求解了转动惯量。研制了一套大型回转体转动惯量测量系统,对不同组合的标准件进行转动惯量测量试验,验证了基于HHT的转动惯量计算方法的可行性。大量试验测量结果表明,本系统转动惯量测量相对误差小于0.2%,测量精度显著优于传统的周期法测量结果。 相似文献
18.
邓足斌 《仪表技术与传感器》1997,(6):14-17,24
本文提出的SK-1刚架梁式应变计参数测定装置,同目前国际上一般采用简支纯弯矩梁和等强度悬臂梁原理制成的这类装置这一样。该装置是采用刚架梁原理研制而成,并按作者新提出的标定梁图柱面形状误差和标定梁纯度误差两概念,对其进行误差分析和精度检定,实现了以SK-1装置为主机组合式配套能测K、Z、θ、H等10个参数的高精度应变计参数标定装置。 相似文献