舰用燃气轮机抗冲击计算模型及实验研究

THE RESEARCH OF MODELLING AND TESTING OF SHOCK-ISOLATED SHIP GAS TURBINES

目前,先进国家的舰用燃气轮机设计多采用带减振器的底座,在强冲击试验过程中测得垂直向输入加速度高达200g左右,而经减振器支承隔离的模件底座上测得的峰值负荷则大大地降低。对这样经受巨大冲击加速度的构件进行动态建模,在国内外尚未全面深入地研究过。特别是该模件与船体相连,在冲击过程中与船体骨架有力的传递,而这种冲击力是很难知道的j减震器本身在承受巨大冲击加速度情况下,其振动性态往往表现为非线性,如何找到一种工程应用方法来解决这一问题是本文主要研究目的。文中提出了一个振动加速度脉冲响应函数的新变量,导出了相应公式,并进一步应用于减振器布置优化方案计算中,取得较好效果。

The shock isolated platform has been applied in the design of ship gas turbines in the advanced countries. The levels of vertical shock accelerations at input points of isolators are as high as 200g or so, however, the peak acceleration loads of the platform isolated by shock isolators are low. The dynamic problems of this structure loaded by strong shock acceleration has not been researched by now, especially, this platform is connected by the hull and the forces are transmitted from frame of ship to it. This paper has demonstrated how to modelling shock responses and considered nonlinear behaviour of isolators at shock environments. A new variable acceleration Impulsive Response Function has been presented and applied to optimization of isolator arrangements.