缓冲材料振动传递率的测试及非线性辨识

Testing and nonlinear identification of vibration transmissibility for cushioning materials

本文依据相关的标准和工程实际需求,分析了振动传递率测试中的试样固定方式,设计了一种简易固定装置。以发泡聚乙烯为例,分析了振动传递率测试方法,将4种厚度规格的试样分别在5种应力下进行了3Hz～200Hz的扫频试验,测出了发泡聚乙烯在不同厚度和应力下的振动传递率,并对试验结果进行了分析。采用BP神经网络建立了振动传递率非线性模型,并利用matlab/nntool对网络进行了训练和仿真,结果表明,该模型具有较强的泛化能力,能精确辨识振动传递率,从而可以预测任意厚度和应力下的振动传递率。

Basic relevant standards and engineering demand the sample fixed method was analyzed, a simple device was designed. Test method of vibration transmissibility taking expanded polyethylene for instant was analyzed. The samples were divided into four kind of thickness, and a series of vibration transmissibility was tested through frequency scanning test from 3-200Hz with deferent stress. The results were analyzed. A nonlinear model for vibration transmissibility was established with BP network, trained and simulated with matlab/nntool. The results show that the model has a better generalization and identification ability, and can be used to predict the vibration transmissibility of cushion materials with different thickness and stress.