基于分频段加权的加速振动试验方法

振动环境工程研究现行采用的加速试验方法中,都只考虑了加速因子与频率无关这种情形,这不仅提高了试验设备的推力要求,也增加了位移指标要求。文章提出了一种分频段加权的加速振动试验方法,即通过对低频段加速因子的权重的优化设计,实现较小的位移指标要求,且疲劳损伤累积等效。给出了基于Dirlik方法和TB方法疲劳损伤等效的加速试验设计方法和工程实现流程。针对该方法开展了应用实例的计算,结果表明:在疲劳损伤等效的前提下,显著降低了振动台的位移,且推力基本维持不变。

An accelerated random testing procedure based on frequency band weighting approach

The acceleration factor without consideration of the frequencies in the vibration engineering will require large displacements and forces for the shaker. A new accelerated random testing method is proposed based on the frequency band weighting and the required displacement for the shaker is less than that of the standard method due to the weighting factor design in the low frequency bands. A design procedure and an engineering scheme are developed according to two spectral models of the fatigue damage estimation, namely, the Dirlik model and the TB model. The numerical examples show that the proposed program can be used for the accelerated vibration testing design without large shaker displacement.