Then the transform method and the digital broad - band data from china is applied to obtain the wide period attenuation relationships for horizontal acceleration response spectra of eastern china and western china in rock sites ( c , = 5 % ) 最后用常规的转换方法，并加入我国158条水平向宽频带数字记录，建立了中国东部和西部地区的水平向基岩宽周期( t = 0 . 04 - 20s ， = 5 )加速度反应谱衰减关系。
Results show that all the parts of the artillery produce vibration acceleration in the traveling course . the power spectrum is mainly in the low frequency segment . worse road surface and higher speed will cause higher power spectrum value of the acceleration response 结果表明火炮牵引行驶过程中各部件均产生振动加速度，其功率谱主要分布在在低频段，路况差、速度高则加速度响应的功率谱值高。
( 2 ) the response characteristics of wind - induced vibration under uncertain parameters were analyzed , which suggested a simplified method for evaluating mean and standard variance of acceleration responses . compared with the results given by a form and fosm method , the suggested methods can give a more precise estimation ( 2 )研究了随机参数作用下的结构风振均方根加速度响应的分布规律，给出了直接估计均方根加速度响应均值和方差的解析表达式。
The empirical attenuation relationship for horizontal acceleration response spectrum in reference region is developed by regression , and the relationships for eastern china and western china are obtained by transform method and the data from china . the western north america is set as the reference region 在方法上，采用了经验统计方法回归参考地区的反应谱衰减关系，用转换方法并加入中国数字地震台网记录得到中国东部地区和西部地区的反应谱衰减关系。
On the basis of theoretic analysis and numeric calculation , the author verifies that only is the ratio of the fundamental period of the structure to the disturbance period beyond 1 . 4 , it ' s possible to achieve reductions in both the relative displacement and the absolute acceleration responses 作者在此基础上，从理论分析和数值计算两方面证明了粘性变阻尼控制仅在结构周期与激励主周期的比值大于1 4时才有可能同时减小结构的位移反应峰值和加速度反应峰值。
Such a semiacitve control system is not only with a broad frequency range for vibration suppression but also apt to implement . numerical results show that using the discrete control can generally decrease the displacement response but increase the acceleration response , whereas using the co 同时通过数值计算发现，变刚度控制如果采用离散控制的方法，尽管可以有效抑制结构的位移反应，但是大多数情况下对于加速度反应则是不利的；相反，连续控制则显得比较灵活，可以有效克服这种缺陷。
Under these assumptions , three kinds of excitations , namely , harmonic force with frequency equal to the structural fundamental frequency , harmonic force with frequency equal to half of the structural fundamental frequency and pulse force are inputted to the undamaged and damaged structures . then under the same excitation , the undamaged structural displacement responses , velocity responses , acceleration responses , jerk responses and responses of integrated displacement are compared with that of the damaged ones 在此假定基础上,分别将激励频率等于结构基频的简谐形激励、激励频率等于结构基频之半的简谐形激励和锤击激励输入结构,而后比较了损伤前后结构在相同激励下的位移响应、速度响应、加速度响应、加加速度响应和位移积分响应。
Base isolation technology is one of the most efficient method for seisin resistant . by putting the isolation system between the top - structure and the base , it can enhance the damp of the building , prolong the periods , decrease acceleration response when the building was under earthquake 基础隔震是新型抗震主要手段之一，它是在建筑物与其基础之间，垫上隔震系统，来延长结构周期，给予结构适当的阻尼，使结构的加速度反应大大减弱，让结构的大位移主要由结构物底部与基础之间的隔震系统提供。
This continuous rule can put the suspension system in the optimal damping state . the skyhook principle can be combined in this control rule , which can further attenuate the vibration of the car - body in lower frequency range , but the acceleration response in higher frequency range tend to be larger 文中还研究了把基于天棚阻尼原理的阻尼控制策略结合到该控制系统中的复合控制方法，前者能使系统始终处于最优或次优阻尼，后者则能进一步衰减低频振动，但也有增大高频响应的趋势。
This paper relates to some problems about the determination of design ground motion parameters , which include the choice of the attenuation relationship of rock horizontal acceleration response spectrum , the impact of focal depth to rock peak horizontal acceleration and rock response spectrum curves , the choice of intensity envelops function and random input phase , the choice of soil nonlinearity and shear wave velocity , scale of design ground motion response spectrum etc . in the researches of relative aspect , based on a typical section plane of the engineering site , influence of the change of some parameters on design ground motion parameters and the existing errors and corresponding rules are studied by using the method of one dimension model of equivalent linearization 摘要研究了确定设计地震动参数中涉及的若干问题，其中包括基岩水平加速度反应谱衰减关系的选择、震源深度对基岩水平加速度峰值及基岩反应谱曲线的影响、强度包络线函数及输入随机相位的选择、土体非线性特性参数和土层剪切波速值的选择、设计地震动反应谱的标定等问题。
