车辆系统动力学与控制论文讲解

1、同济大学TONGJI UNIVERSITYAnalysis of vibration amplification in a multi-staged clutch damper during engine start-upJournal: Automobile Engineering 2015报告人：苑仁飞报告人：苑仁飞导导 师：吴光强师：吴光强教授教授学学 院：汽车学院院：汽车学院学学 号：号：1510809TONGJI UNIVERSITY同济大学同济大学该该文章所要解决的问题文章所要解决的问题：Previous investigations on the piecewise linear

2、 system have focused mostly on numerical methods, and thus a reliable analytical method is not available for predicting transient amplification events.（发动机启动工况下对于离合器减振器分段线性扭振系统的研究文献绝大数集中在数值解方法，缺乏对该问题的解析解研究）TONGJI UNIVERSITY同济大学同济大学文章文章框架框架1：To compare the transient vibration amplification level betw

3、een the linear and piecewise linear torsional systems describing the engineflywheelclutch-dampertransmission system using a numerical method .（利用数值方法对比线性扭转系统和非线性扭转系统之间的关系，对比4DOF、3DOF和2DOF之间的关系）TONGJI UNIVERSITY同济大学同济大学发动机输出转矩：两缸发动机输出转矩：The natural frequencyCorresponding mode4DOF13.90.01 1 0.99 0.993

4、DOF13.50 0.99 12DOF13.50 1The natural frequency calculations suggest that the 2DOF semidefinite system or the SDOF definite system can fully represent the clutch mode of the 4DOF semidefinite system with focus on the relative motion.（从固有频率及振型的角度，数值仿真验证4DOF模型可由2DOF模型代替）TONGJI UNIVERSITY同济大学同济大学This f

5、igure shows that from an SDOF model is sufficiently close to from a 4DOF system. Also, both a 4DOF system model and an SDOF system model yield similar answers for or ; these are not included here, however.(从 的角度，数值仿真验证4DOF模型可由2DOF模型代替)(数值仿真参数设定)TONGJI UNIVERSITY同济大学同济大学整车实验的传感器布置Experimental measure

6、ment of (the peak-to-peak value of ) is compared with the corresponding predictions from linear models. The comparisons in Table further justify the utility of an SDOF powertrain system with an instantaneous motion input (from the flywheel).Experiment2DOF513525(从 的角度，整车实验验证2DOF模型对实际情况的有效性)TONGJI UNI

7、VERSITY同济大学同济大学The analytical forms of and are assumed to be(解析方法的输入量表达式) is selected to be 82.9 rad/s (13.2 Hz) to represent the clutch mode.TONGJI UNIVERSITY同济大学The governing equation of the nonlinear SDOF system is given as分段函数单一表达式TONGJI UNIVERSITY同济大学Accordingly, it is reasonable to assume that

8、 a linear torsional oscillator may be utilized to approximate a nonlinear system when(从 的角度，表明刚度和阻尼的线性化处理可以近似非线性的情况，后续研究中用线性系统代替非线性系统。)TONGJI UNIVERSITY同济大学同济大学文章文章框架框架2：To develop and verify a new closed-form solution for a linear damped torsional oscillator, given an instantaneous frequency (speed

9、) input.（给定系统输入的情况下，解析求解线性扭转系统）TONGJI UNIVERSITY同济大学同济大学An analytical solution of the linear damped system is first sought by setting to give解析解TONGJI UNIVERSITY同济大学同济大学文章文章框架框架3：To utilize the proposed closed-form solution to approximate the transient amplification of a piecewise linear torsional oscillator.（验证解析解与数值解的一致性）TONGJI UNIVERSITY同济大学同济大学解析解数值解单阶激励工况n=1TONGJI UNIVERSITY同济大学同济大学多阶激励工况n=1.5，3，6，9The figure andtable suggest that the new analytical solut