超声波振动切削系统幅载特性的研究

超声波振动切削是一种新型的复合加工方法，其关键之一是在切削的有载状态下能否保持一定的振幅值，本文就中置式超声波振动切削系统的幅载特性进行了理论和实验研究。     

Maxwell模型粘弹性矩形厚板固有横向振动

由于各向同性粘弹性体剪应力-角应变的本构关系与应力-应变的本构关系相似,据此可得到Maxwell模型粘弹性矩形厚板固有横振微分方程。并讨论了Maxwell粘弹性矩形厚板的振动特性。     

颗粒与液体可连续分离的振动装置参数分析

本文提出了一种用振动方法将颗粒与液体连续分离的装置，在理论上推导了一些参数需满足的条件，还设计并生产了产品，经使用能实现连续分离的要求。     

FLOW-INDUCED VIBRATION AND DAMAGE IN SIEVE-TRAY COLUMNS

Certain failures in absorption and distillation columns are attributed to flow induced vibrations. Mechanisms by which column pressure pulsations can occur are discussed. The mechanism most closely linked to the damage conditions is identified and its limits and characteristics defined. Interaction between the pulsation phenomenon and the mechanical damage is discussed.     

石灰石矿减振爆破技术研究

介绍了减振爆破技术在河北省２６７２工厂石灰石矿的试验和应用。在以降低爆破地震效应为主要目标的研究中，通过参数试验以及对影响爆破效果的主要因素（如起爆方式、底盘最小抵抗线、孔网参数、药量、装药结构等）的详细分析，提出了操作性强的爆破方案，取得了良好的效果。     

On the determination of mechanical properties of composite laminates using genetic algorithms

This paper describes a method which combines finite element analysis and genetic algorithms (GAs) for identifying the elastic constants of composite laminates by using vibration test data. A procedure updates the elastic constants in a numerical model so that the output from the numerical code fits the results from vibration testing. In this approach, the elastic constants can be readily identified in a single test without damaging the structure. The GA, developed on a personal computer using the language MATLAB, applies the general-purpose numerical code MSC-NASTRAN to carry out the modal analysis.     

Protection of Overhead Conductors at the Inlet to a Connector

A method that enables determination of maximum amplitudes of standing vibration waves, off-horizontal angles of the conductors, moments of resistance, and cutting forces in any cross section of any type of conductor and connector with the help of SVT-connector software is described. Comparative values of the mentioned parameters at the outlet of the conductor from rigid dress and at the inlet to the connector are presented.     

Effect of Swinging of Vibration Sensors on Their Calibration Error

The requirements of GOST ISO 5347-1–96 for restricting the level of vibration sensor swinging during calibration are considered. It is demonstrated that that section of the standard must be made more stringent. The error of measurement of small vibration amplitudes (less than 0.2 m) during measurements is estimated from a spectral analysis of an interferometer signal.     

多模态柔性系统的最优时滞滤波器设计

时滞滤波器是一种消除柔性系统残留振动的有效方法。本文对多模态柔性系统的时滞滤波器设计进行了讨论。在最优随机时滞滤波器的基础上,通过使在某一频率下的残留振动最小,求出最优的时滞时间和频率,来设计最优时滞滤波器,消除系统中所有模态的残留振动。与一般的级联法相比,该方法减少了脉冲个数,大大减小了时滞时间,具有一定的鲁棒性。仿真结果进一步证明了该方法的有效性。