| 摘要:激振力识别是内燃机振动控制的基础和重要环节,为了确定内燃机整机系统的质量、转动惯量、刚度、阻尼、质心位置等各测试参数误差对激振力(矩)的识别精度的影响,通过数值模拟生成了整机振动加速度时域信号,根据相关动力学原理编写了内燃机激振力(矩)识别程序,利用试验及经验确定了测试参数误差的波动范围,分析了多工况下的各个测试参数误差对激振力(矩)识别精度的影响。结果表明:若需二阶往复惯性力(矩)、三阶和六阶倾倒力矩识别误差小于5%,则质量测试误差需小于±4.27%,转动惯量测试误差需小于±4%,刚度测试误差需小于±20%,阻尼系数可用范围为0.075~0.125,质心偏移误差需小于±40mm。 |
| 关键词: 内燃机 激振力 识别 测试 误差 |
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| The Effect of Measurement Error on the Recognition Accuracy of Exciting Forces of ICE |
| Li Shujing,Yan Bing,Sun Meiyun,Gao Feng,Dong Dawei,Sun Yuhua |
| School of Mechanical Engineering, Southwest JiaoTong University , Sichuan Chengdu 610031;Tangshan Railway Vehicle Co.,Ltd., Hebei Tangshan 063000 |
| Abstract:Exciting force recognition is the basis and important segment of vibration control in internal combustion engine. To ascertain the effect of the measurement errors of the overall system mass, rotational inertia, stiffness, damp, center of mass etc. on the accuracy of exciting force recognition, numerical simulation has been conducted and a series of temporal signals have been obtained. Meanwhile, a program has been developed to abstract exciting forces and exciting torques from the temporal signals according to the theory of internal combustion engine dynamics. Moreover, based on the error range, defined either empirically or experimentally, the effect of testing parametric errors on the recognition accuracy of exciting forces has been assessed in terms of a series of working conditions. The results showed that to ensure the recognition errors of the second order reciprocating inertia force and torque, the third order and sixth order overturn torque to be within 5%, the measurement errors of mass, rotational inertia, stiffness should be within ±4.27%, ±4%, ±20%, respectively. In addition, the damping coefficient should be kept within 0.075～0.125 and the absolute error of the center of mass position should be within ±40mm. |
| Key words: internal combustion engine exciting force recognition test error〖FL |
