模拟随机过程在阻尼器力学性能试验中的应用
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摘要
通过对单调循环加载方式的分析,提出了随机过程加载的概念。对一定功率谱和位移情况,在液压伺服试验系统中实现了人工模拟的随机过程的加载试验。同时,也对功率谱、位移发生变化的情况进行了分析。对随机过程加载的试验结果进行处理,提出了基于概率统计的等效刚度、等效阻尼及耗散功率谱等方法。随机过程加载解决了加载中速度、频率耦合的问题,也简化了加载工况的分类,实现了阻尼器瞬时动力性能的测试。对于其他阻尼构件如橡胶隔振支座等也具有应用意义。
After analyzing the simple cyclic loading test,a concept of loading test with random process is suggested.As for certain power spectrum and displacement,one stochastic process is simulated and used into servo-dynamic test system.On the other hand,the condition of varying power spectrum and displacement is also considered.For analyzing the result of random test,the methods of equivalent stiffness,equivalent damping coefficient based on statistics are prompted.The random testing method resolved the coupling between loading velocity and frequency,and also simplified the assorting of loading circumstance.Meanwhile,the random testing method achieved the dynamic test for instantaneous characteristic of the specimen.As for other specimen such as rubber isolator,this method also has an advantage of utilization.
After analyzing the simple cyclic loading test,a concept of loading test with random process is suggested.As for certain power spectrum and displacement,one stochastic process is simulated and used into servo-dynamic test system.On the other hand,the condition of varying power spectrum and displacement is also considered.For analyzing the result of random test,the methods of equivalent stiffness,equivalent damping coefficient based on statistics are prompted.The random testing method resolved the coupling between loading velocity and frequency,and also simplified the assorting of loading circumstance.Meanwhile,the random testing method achieved the dynamic test for instantaneous characteristic of the specimen.As for other specimen such as rubber isolator,this method also has an advantage of utilization.
引文
1张志强,李爱群,蔡丹绎,等.合肥电视塔人造脉动风荷载的仿真计算.东南大学学报(自然科学版),2001,31(1):69-73
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5 Shinozuka M,Deodatis G.Simulation of Multi-Dimensional GaussianStochastic Fields by Spectral Respresentation.Applied MechanicsReview,1996,49:29-53
6 Shinozuka M.Simulation of Multivariate and Multidimensional RandomProcesses.The Journal of the Acoustical Society of America,1971,49(1):357-368
7 Shinozuka M.Stochastic Fields and Their Digital Simulation,StochasticMethods in Structural Dynamics.Dordrecht:Martinus Nijhoff Publishers,1987:93-133
8 Model 793.10 Multi-Purpose Test Ware User Information and SoftwareReference.MTS Systems Corporation,100-068-915 E.2002:137-147
9张准,汪凤泉.振动分析.南京:东南大学出版社,1991:54-57
2邱法维,钱稼茹,陈志鹏.结构抗震实验方法.北京:科学出版社,2000:14-17
3克拉夫R W,彭津J.结构动力学.王光远,等译.北京:科学出版社,1981:154
4星谷胜.随机振动分析.北京:地震出版社,1977:42-45
5 Shinozuka M,Deodatis G.Simulation of Multi-Dimensional GaussianStochastic Fields by Spectral Respresentation.Applied MechanicsReview,1996,49:29-53
6 Shinozuka M.Simulation of Multivariate and Multidimensional RandomProcesses.The Journal of the Acoustical Society of America,1971,49(1):357-368
7 Shinozuka M.Stochastic Fields and Their Digital Simulation,StochasticMethods in Structural Dynamics.Dordrecht:Martinus Nijhoff Publishers,1987:93-133
8 Model 793.10 Multi-Purpose Test Ware User Information and SoftwareReference.MTS Systems Corporation,100-068-915 E.2002:137-147
9张准,汪凤泉.振动分析.南京:东南大学出版社,1991:54-57
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