SRS分析

jordan

那位大虾有没有关于SRS分析的资料啊，我们要做一个冲击的测试，要用SRS分析，不知道在做跌落测试时，跌角或边时能否拿来分析，我们有TP3但SRS没有边和角的选项。

xiaoye

　　OROS
　　Reporting and Structural Solutions
　　13.1 What is Shock Response Analysis?
　　We use shock response analysis to examine the effects of short duration peak stresses and accelerations on a structure. With shock response analysis, we can evaluate the damage potential of shock pulses on a structure and use the results to design shock isolators. The inputs to the Shock
　　Response Analysis Wizard are the shock measurements we make on a structure. The outputs from the Shock Response Analysis Wizard are shock response spectra.
　　13.1.1 What is a Shock Response Spectrum?
　　Applying a shock pulse to a single degree of freedom (SDOF) system results in a time response of the SDOF system. The peak value of the time response of the SDOF system is a function of the natural frequency and damping of the SDOF system. A shock response spectrum of a shock pulse is the peak response of a series of SDOF systems, plotted as a function of the natural frequencies of the SDOF systems. We use shock response spectra because they give shock analysis results that are not dependent on the shape of the shock pulse, but on the damage potential of the shock pulse. If the duration of the shock pulse is less than 1/2 to 1/4 the period of the SDOF system, the effect of the shock pulse on the structure is independent of the shock pulse shape. The independence of a shock response spectrum on the shock pulse shape results in a more accurate description of the effects of the shock pulse on the structure. For reference information, refer to the section “List of References“.
　　13.1.2 Shock Response Spectrum Models
　　We compute the shock responses by solving the equations of motion of a base undergoing a shock pulse, and an SDOF system attached to the base with a spring and a damper. Base excitation occurs when we subject the support of a dynamic system to a sudden movement. We specify the base motion in terms of the displacement, velocity or acceleration of the base. The base motions are the measurements that we make as inputs to the Shock Response Analysis Wizard. We calculate the response of a series of SDOF systems, varying in natural frequency, due to the base excitation input.
　　We specify the SDOF response in terms of the relative displacement between the base and the SDOF system, or in terms of the velocity or acceleration of the SDOF system. The peak value of the SDOF responses, plotted as a function of the natural frequencies of the SDOF systems, is the shock response spectrum output of the Shock Response Analysis Wizard.The Shock Response
　　Analysis Wizard currently supports an absolute acceleration shock response model, a relative displacement shock response model, and an absolute velocity shock response model.
　　Absolute Acceleration Shock Response Model
　　In the absolute acceleration shock response model, we express the SDOF response in terms of the absolute acceleration of the SDOF system. The input to the model is the measured absolute acceleration of the base.
　　Relative Displacement Shock Response Model
　　We use the relative displacement shock response model when the shock damage potential is related to the displacement of the structure. We express the SDOF response in terms of the relative displacement between the base and the SDOF system. We then express the relative displacement as the equivalent static acceleration. The input to the model is the measured absolute acceleration of the base.
　　Absolute Velocity Shock Response Model

clark

原帖由 jordan 于 2008-12-15 11:53 发表
那位大虾有没有关于SRS分析的资料啊，我们要做一个冲击的测试，要用SRS分析，不知道在做跌落测试时，跌角或边时能否拿来分析，我们有TP3但SRS没有边和角的选项。

SRS资料，你可以在可靠性家园网，找我以前发的一个贴子，里面有详细介绍SRS的。

算了，还是我自己去哪里找到链接了。
http://www.vibrationdata.com/tutorials2/

SRS专家Tom Irvine