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1.
旋转壳局部几何缺陷对其系统固有频率的影响   总被引:2,自引:0,他引:2  
本文提出了分析具有几何缺陷旋转壳动力特性的初位移法,利用本方法本文对一般几何缺陷的动力影响进行了分析,並对轴对称几何缺陷的问题进行了计算。计算中考虑了两种边界条件:一种是固定支承的;一种是弹性支承的。结果表明,对于本文的特定问题,壳体局部几何缺陷使系统的基频升高。  相似文献
2.
封装材料对压阻式加速度传感器性能的影响   总被引:1,自引:0,他引:1       下载免费PDF全文
通过实验测试的方法研究分析封装材料对压阻式高量程加速度传感器性能的影响。对使用陶瓷 材料和不锈钢材料封装的加速度传感器,利用拉曼光谱仪测试研究封装前后传感器结构中残余应力和压敏 电阻阻值的变化,采用落锤、Hopkinson杆测试分析传感器的灵敏度、高过载能力,并在实弹环境中测试不同 封装传感器的测试精度的差别。实验结果显示,与陶瓷材料封装的压阻式加速度传感器相比,不锈钢材料封 装的压阻式加速度传感器在封装后结构的残余应力和压敏电阻阻值的变化更大,但不锈钢封装传感器的灵 敏度更大、高过载能力更强,同时实弹环境中可靠性和测试精度更高。  相似文献
3.
In this paper, an appr cimate method is established to solve the couple problem between different harmonic waves in terms of the heeds of nonsymmetric imperfections of cooling tower. By means of this method, the frequencies and response of rotational shell with local geometric imperfections are analysed and calculated.  相似文献
4.
In this paper, dynamical calculation and analysis are made on penetration of thinplates by truncated conical projectiles in terms of the needs of fuze designing. The impactvelocity ranges from 200m/s ts to 1000m/s (including both low and high velocities). Thetarget plates include the thin aluminium plate (metal) and the plywood (non-metal).Because a strength effect of target plates is considered in the establishment ofdynamical models, we solved the problem that some previous models were not suitable tolowvelocity impact.for example, M. Zaid and B. Paul's models. By comparison ofinertial effect with strength effect, we theoretically proved Zaid and Paul's experimentalconclusion."Only when the impact velocity is more that 500m/s can the strength effect beneglected. Otherwise this effect can not be neglected".  相似文献
5.
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
6.
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
7.
IntroductionInengineering,thenonlinearityofshellstructureissometimesobvious.Itisverydifficulttosolvetheproblemofthenonlinearrandomvibration .Inthispaper,wetrytosolveitinthefrequencydomainbyanimprovedstatisticlinearizationmethod .Weconsideronlythegeometr…  相似文献
8.
In this paper, in terms of the characteristics of weak coupling problems hetween different harmonic waves, a perturbation method was presented to solve the coupling problem among harmonic waves.  相似文献
9.
In this paper, an additional stiffness matrix of meridional geometric imperfections wasformed by considering the geometric imperfections as initial displacements based onreference[7].Then, natural frequencies and models of rotational shell with symmetricgeometric imperfections were analysed by perturbation method.From the computedexample, it was known that the effect of geometric imperfections of frequencies is toincrease them, and the larger the range of imperfection, the more the frequencies would beincreased.  相似文献
10.
本文采用类似于扁壳理论的方法,处理了圆柱壳轴对称缓变几何缺陷对其弯曲的影响,并建立了具有轴对称缓变几何缺陷圆柱壳的自由振动微分方程。而后,对两端简支的缺陷圆柱壳的自然频率进行了计算和分析。  相似文献
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