振动试验控制点位置选取方法研究

Study on Selection Method of Vibration Test Control Point Position

某航空传感器产品振动试验中壳体出现断裂。经测试,夹具上产品安装点位置振动量值达到50 g,相对目标谱放大了8倍,明显超出产品抗振能力。测试分析发现,该振动试验控制点位置选在振动夹具的下方,夹具共振使产品过试验。根据产品安装点振动响应均方偏离度最小理论,确定了振动试验控制点选取原则。通过仿真分析得到夹具振动响应最大和最小点的位置,并将其作为控制点的位置,之后进行振动试验验证。试验结果表明,产品安装点的振动响满足要求并通过振动试验考核。该方法可以推广到其他类型振动夹具的控制点选取中,从而保证产品振动试验的有效性。

The shell of a sensor product was broken in the vibration test.The vibration value at the installation point of the product reached 50g,and the frequency spectrum was amplified 8 times relative to the target,obviously exceeding the anti-vibration ability of the product.Test analysis shows that the vibration test control point position is selected below the vibration fixture,resulting in obvious resonance of product installation position and over-test of the product.According to the minimum mean square deviation of the vibration response of the product installation point,the selection principle of the control points in vibration test was determined,and the positions of the maximum and minimum points in the vibration response of the fixture were obtained as the positions of the control points through simulation analysis,and then the vibration test was verified.The vibration response of the installation point of the product meets the requirements and passes the vibration test.This method can be extended to other types of vibration fixture control point selection to ensure the effectiveness of product vibration test.