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reciprocating machinery
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In order to supply oil to the connecting rod bearing, a partial circumferential groove is often adopted in the main bearing of a reciprocating machinery. However, most of the bearing calculation methods do not consider the presence of the circumferential groove. In order that the dynamically loaded bearing oaloulation may take a step forward in the quantitative direction, the authors have developed a computer programme to take the circumferential groove into account and solved the pressure distribution...

In order to supply oil to the connecting rod bearing, a partial circumferential groove is often adopted in the main bearing of a reciprocating machinery. However, most of the bearing calculation methods do not consider the presence of the circumferential groove. In order that the dynamically loaded bearing oaloulation may take a step forward in the quantitative direction, the authors have developed a computer programme to take the circumferential groove into account and solved the pressure distribution problem numerically with any desired precision. Besides, the grooves with different dimensions are analysed and compared. Results of the calculation indicate that the load-carrying capacity with consideration of the groove may be several times less than that without groov(?) consideration and the oil pressure resultant may vary by tens of degrees in direction. The great influence of considering partial circumferential groove on the calculation of dynamically load(?)d bearings is thus fully demonstrated.

现今普遍采用的各种轴承计算方法中,绝大多数都未考虑部分周向油槽的存在.为了使动载轴承计算从定性向定量方面前进一步,本文在考虑部分周向油槽具体结构的前提下,用数值计算方法求出了按任何要求精度逼近于动载轴承中压力分布精确值的解,并拟订了相应的通用计算程序.此外,还对不同的油槽尺寸下的情况进行了分析比较.计算表明,不考虑油槽时承载能力可能是考虑油槽时承载能力的几倍甚至更多,油膜反力的方向二者则可能相差几十度甚至更大.这充分说明了在动载轴承计算中考虑部分周向油槽的重大影响.

The Wigner Distribution(WD)of a signal can be intereted as a distribution of the signal energy in time and frequency .The time-frequency distribution is used to analyze the local frequency characteristic of a variety of signals The WD is demonstrated to accurate track change in vibration level with time,and to be suitable for the anlaysis of nonstatlonary signal by means of using simulations The vibration signal of the reciprocating machinery has a timevarying signature A newmethod,based on the WD time-frequency...

The Wigner Distribution(WD)of a signal can be intereted as a distribution of the signal energy in time and frequency .The time-frequency distribution is used to analyze the local frequency characteristic of a variety of signals The WD is demonstrated to accurate track change in vibration level with time,and to be suitable for the anlaysis of nonstatlonary signal by means of using simulations The vibration signal of the reciprocating machinery has a timevarying signature A newmethod,based on the WD time-frequency analysis model,is more sensitive to mechanical condtion than those based on traditional spectrum analysis Better results will be obtained in the condtionmonitoring of reciprocating machinery,if the Wigner Distribtuion os employed.

本文讨论了一种时间一频率两维分布-Wigner谱.指出Wigner谱具有很好的跟踪时变信号的特性,适用于非平稳信号的分析,应用于往复式机械的状态监测,得到了较好效果.

:In this paper,the characteristics of oil analysis and vibration analysis are explained. Additionally, WZG-111 Diagnosis Engineering Kit which comprehensively utilizes the two method for reciprocating machinery is introduced.

阐述了油液分析法和振动法的特点,介绍了综合使用这两种方法的WZG-111型往复机械诊断工程箱。

 
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