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Based on the equations which describe the dynamic behavior of material under high-velocity and high-pressure shock, corresponding equations at shock front whose surface is general space curve surface were established. For concrete material, a normal expansion theory was proposed by which some deceleration about time history of the projectile can be analytically given. This normal expansion theory is not only suitable for spherical and cylindrical-nose projectile, but also suitable for other general nose projectile, for example conical nose or ogive-nose. And it is not only suitable for perpendicular shock but also for oblique shock. 相似文献
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For a non-linear system excited by a stochastic load which is expressed as a time series,a recursive method based on the Z-transform is presented.To identify the obtained response time series,a discrete wavelet transform (DWT) technique is proposed. 相似文献
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IntroductionInengineering,thenonlinearityofshellstructureissometimesobvious.Itisverydifficulttosolvetheproblemofthenonlinearrandomvibration .Inthispaper,wetrytosolveitinthefrequencydomainbyanimprovedstatisticlinearizationmethod .Weconsideronlythegeometr… 相似文献
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应用可靠性工程的理论和方法,在分析数控机床操作工人人为差错分布规律的基础上,研究了数控机床人因可靠性数字特征的求法. 相似文献
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针对飞行器在长航时高速巡航过程中,捷联惯性导航系统存在误差漂移,GPS 导航可能会丢星、信号失锁,天文导航系统易受环境干扰,组合系统模型线性化误差易导致滤波发散等问题,分析了三种导航系统的优缺点,提出了 SINS/GPS/CNS 组合导航联邦滤波算法,该算法可以取长补短,巧妙地将 GPS 定位和天文导航定姿精度高的优势辅助于捷联惯导系统,利用卡尔曼联邦滤波器对捷联惯导系统进行误差估计,并对联邦滤波算法进行了有效的改进.计算机仿真显示,该滤波器收敛速度快,具有一定的容错功能,其滤波精度较 SINS/GPS 组合导航系统在位置误差和速度误差上均有约5%左右的小幅提升,在平台角误差上更是提高了一个数量级.仿真结果验证了该组合导航方案的可行性和算法的有效性,有重要的工程应用价值. 相似文献
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介绍了两个组合群验数学模型,然后根据这两个数学模型,利用组合群验的理论和方法诊断数控机床故障部件,给出了数控机床故障诊断的新方法. 相似文献