修正载荷识别远场误差的虚拟远场激励方法

发布时间：2018-02-26 02:06

本文关键词： 载荷识别远场误差虚拟远场激励复杂机械系统转子机油泵　出处：《机械工程学报》2016年01期 　论文类型：期刊论文

【摘要】：载荷识别方法是工程振动噪声测试与分析中常用的一种振动响应逆向求解方法。但是由于载荷识别方法实施的过程中不能很好地考虑结构系统的复杂阻尼特性,导致在离激励点较远的远场,误差非常大,这对载荷识别方法的广泛应用提出了挑战。提出虚拟远场激励方法,即在离激励点较远的远场位置布置虚拟激励点,来实施载荷识别,由此可以避免结构中由于离激励点较远的位置的存在而带来的远场求解误差。通过与试验测试数据、传统载荷识别方法求解结果进行对比,表明采用虚拟远场激励方法求解得到的振动响应与试验测试数据更为接近,特别是在远场,误差得到了显著的改善。这表明,虚拟远场激励方法可以有效提高传统载荷识别方法在远场的求解误差,而且可以广泛用于各种载荷激励难以确定的复杂机械系统的振动求解。
[Abstract]:Load identification method is a kind of inverse solution method of vibration response in engineering vibration and noise testing and analysis. However, the complex damping characteristics of structural system can not be considered well in the process of carrying out load identification method. As a result, the error is very large in the far field far away from the excitation point, which challenges the extensive application of the load identification method. A virtual far field excitation method is proposed, that is, the virtual excitation point is arranged in the far field position far away from the excitation point. In order to avoid the far field solution error caused by the distance from the excitation point in the structure, the method is compared with the test data and the traditional load identification method. It is shown that the vibration response obtained by using virtual far-field excitation method is closer to the experimental data, especially in the far field, and the error is improved significantly. Virtual far-field excitation method can effectively improve the error of the traditional load identification method in far field and can be widely used to solve the vibration of complex mechanical system which is difficult to determine the load excitation.
【作者单位】：西安交通大学机械工程学院;Department
【基金】：国家自然科学基金资助项目(51375362)
【分类号】：TB123

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