Torsion Vibration Test and Analysis of Main Transmission System of 1450 Rolling Mill

The torsion vibration of main transmission system of 1 450 rolling mill is tested:The torsion vibration frequency and amplification coefficient of torque are obtained.Basing on part of the measured date and theoretical analysis,the measure is developed for preventive method;it is of important theoretic sense and high engineering practical value for reducing accident and controlling torsion vibration.     

A Method of Analyzing the Parameter Sensitivity of Large Rotor Systems and Its Application

Based upon the eigenvalue sensitivity theory of non-self-adjoit system and the component mode synthesis method,a new technique is developed to analyze the eigenvalue sensitivity to variation of parameters of large rotor-bearing system. As an application, the influence of the journal bearing parameters on the stability of a large domestic turbine-generator set is analyzed and discussed.     

Research on Dynamics of Installation Way for Active Isolation Actuator on Flexible Foundations

The dynamic characteristic of active isolation atuator on flexible foundations was studied under the installation of parallel structure and foundation cancellation.The influencing relationships between active isolation force of the different installation ways and passive isolation system and flexible foundation were analyzed and compared.Scientific basis for selecting installation ways of active isolator is provided in this paper.     

Parsimonious Covering Probability Model for Turbogenerator Vibration Faulty Diagnosis

The turbogenerator vibration faults have the character of variety. Many faults often occur synchronously. This paper introduces a diagnosing model based on parsimonious covering theory and probability. A model for turtogenerator's fault diagnosis is proposed. The availability of this method is proved by two fault diagnosis examples of turbogenerator. The results show that the model proposed can be used for multi_fault diagnosis together. It may make up shortage for some of expert systems and neural networks in some aspect. From the practice,this model has higher reliability and practicability.     

拖拉机－挂车机组非线性系统随机响应分析

推导了随机激励下参数频变系统的统计线性化方法。利用该方法对铁牛－６５４拖拉机挂车机组非线性系统进行了平稳激励下随机振动响应的计算，计算结果表明，把拖拉机挂车机组作为非线性系统来处理可显著地提高振动分析的精度。     

内混式自吸离心泵自吸性能影响因素的试验研究

针对比转速为74~112的5台内混式自吸离心泵,采用3种不同直径吸水管和6种不同隔舌间隙,对其规定高度自吸时间和极限真空度进行了较全面的试验研究,并对试验结果进行了综合分析。结果表明,对于内混式自吸离心泵,规定高度自吸时间总体上随吸水管内初始存气量的增加而成线性递增,而极限真空度与吸水管内的初始存气量无关;当隔舌间隙为1~6 mm时,隔舌间隙越小,自吸性能越好;泵的额定流量越大,自吸性能受隔舌间隙的影响越大。该研究对内混式自吸离心泵的水力设计、部分结构参数的确定以及自吸性能的进一步提高具有较重要的意义。     

5100QB柴油机振动测试与分析

针对云内5100QB柴油机装车后在高速行驶工况易出现离合器壳断裂现象,通过各试验工况下的多测点测试及幅值谱的振动分析,分析5100QB柴油机自身的振动力源及导致离合器壳开裂的主要原因。     

液体射流泵空化噪声与振动试验

针对液体射流泵的空化噪声与振动进行了试验研究;运用B＆K加速度仪和水听器对射流泵各部位在不同工况下的空化噪声与振动进行了测量。结果表明：（1）射流泵空化噪声以单极子声源为主,随着流速和紊流度的增大,偶极子作用逐渐增大;（2）射流泵空化噪声与振动随空化程度加剧而更强烈,最强烈处也从喉管向扩散管转移;（3）射流泵面积比越小,达到临界空化前噪声频谱波动越强,临界空化之后噪声谱级趋于平稳,随频率增加而递减;（4）初生空化出现前后噪声在整个频域范围内都有一个较大的跃升,约5-10 dB,此跃升可作为判断初生空化的参考方法;（5）泵体3个正交方向振动并不相同,径向振动较轴向更为明显。     

用振动挤淤法处理标准海堤的软土地基

以淤泥类软土的动力特性为基础发展起来的振动挤淤法，在标准海堤软土地基处理中有其独特的实用性。根据海堤的工程特点，分析了振动挤淤法在处理海堤软土地基的必要性和可行性。并着重阐述了振动挤淤法中3个关键施工参数的理论分析和工程实践，这3个参数包括：基础埋深，最小垫层厚度，施工机械作业参数。