变温环境对压电圆板频率主动控制的影响

定量研究了具有几何非线性热弹性压电圆板的频率压电控制特征，考察了环境温度改变引起的热弹性效应和非线性大振幅振动对其控制特性的影响等．研究结果表明：环境温度的变化使压电控制的固有频率受到影响，而在压电电压较大时，振幅对振动频率影响不大．     

簧片阀三种力学模型的建立及比较

一端固定一端自由的簧片阀片按其运动特征及不同的简化条件，可视为单质点力学系统，连续梁力学系统及平板振动力学系统，并分别给出其数学模型，建立相应的仿真软件系统。最后以管状直流阀为例比较了这三种力学模型的仿真结果，给出了它们的应用场合     

Design of a Laminated Plate Possessing the Required Stiffnesses Using the Minimum Number of Materials and Layers

This paper deals with the problem of the design of a laminated plate possessing the required set of stiffnesses under the condition of using the minimum number of layers and minimum number of materials. It is shown that the minimum number of layers is not more than four and the minimum number of materials is not more than two. We consider the case when three types of stiffness (bending, in-plane and out-of-plane) are prescribed and the case when two types of stiffness (physical bending and in-plane) are prescribed. It is proved that for both cases the sets of the possible values of physical stiffnesses are the same but the sets of designs can be different. A design algorithm is developed.      

单层5A06铝合金板高速撞击实验研究

采用非火药驱动二级轻气炮发射球形弹丸,对单层5A06铝合金板进行高速撞击实验研究,从而模拟空间碎片对航天器防护结构的高速撞击作用。实验得到了该铝合金板在不同的速度区间的损伤模式。结果表明,弹丸撞击速度一定时,弹坑深度和弹坑直径均与弹丸直径呈线性关系。当撞击速度在4km/s至5km/s时,靶板上的弹坑深度和弹坑直径随撞击速度的增大而减小,在其它速度范围内,弹坑深度和弹坑直径随撞击速度的增大而增大。通过固定弹丸直径,变化撞击速度,寻找临界撞击速度的方法获得了该铝合金板在弹丸撞击速度为1.0km/s至4.2km/s时的撞击极限曲线,并将实验弹坑深度与由Cour-Palais方程得到的预测弹坑深度进行了比较,实验弹坑深度大于预测值。     

Tension of a nonthin transversely isotropic plate with a noncircular cylindrical cavity

The three-dimensional stress state of a transversely isotropic plate with a nearly circular cylindrical cavity is examined. The cavity surface is subject to normal and tangential stresses and the plate is subject at infinity to tensile and shear forces. The problem is solved by expanding unknown functions into Fourier-Legendre series in the thickness coordinate and using the boundary-shape perturbation method. The equations and recurrence formulas needed to solve the problem in an arbitrary approximation are presented __________ Translated from Prikladnaya Mekhanika, Vol. 42, No. 11, pp. 101–113, November 2006.     

Unsteady Free Convection along an Infinite Vertical Flat Plate Embedded in a Stably Stratified Fluid-Saturated Porous Medium

The problem of unsteady free convection heat transfer from a one-dimensional (parallel) flow along an infinite vertical flat plate embedded in a thermally stratified fluid-saturated porous medium is considered. Flows are induced by a sudden change in the arbitrary temporal plate temperature. By a formal reduction of the corresponding boundary value problems to well-known Fourier heat conduction problems, analytical solutions of the Darcy and energy equations are obtained. Several special cases are discussed in detail.     

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探讨了载荷重构技术在智能化复合材料结构健康监测中的应用，着重针对一个自感 知复合材料层合板的载荷重构进行了研究. 首先，基于弹性波动理论和层合板理论，建立了 低速冲击载荷作用下正交铺层层合板的前向波动模型的状态空间表达式；通过构造误差指标 $J$, 应用优化求逆重构了载荷时程和载荷的作用点，并应用算例对以上方法进行了验证.     

变厚度板弯曲的边界元分析法

由于变厚度板弯曲问题的控制分方程复杂，直接求解其基本解推导边界积分方程建立边界元分析法较为困难，本文通过引入等效荷载，等效刚度，将此问题的控制微分方程化成与普通薄板弯曲问题基本方程相同的形式，利用求解通板弯曲问题的边界元迭代求解，建立了分析变厚度板弯曲问题的蛤法，算例表明本方法理正确，精度良好。     

THE METHOD OF THE RECIPROCAL THEOREM OF FORCED VIBRATION FOR THE ELASTIC THIN RECTANGULAR PLATES (III)—CANTILEVER RECTANGULAR PLATES

In this paper, applying the method of the reciprocal theorem, we give the stationary solutions of the forced vibration of cantilever rectangular plates under uniformly distributed harmonic load and concentrated harmonic load acting at any point of the plates, the figures and tables of number value of bending moment and the deflection amplitudes as well.     

在水槽中的加速平板问题

本文利用Lagrange方法分析在水槽中平板水平地向静止流体运动的问题,非线性自由面条件能精确满足,所得的结果大致与[2]符合。