In this paper,the vibration frequency adjustment principle of vibration rollers was analyzed,the hydraulic system was designed and its mathematical model was presented for adjusting vibration frequency.In order to ensure that the vibration frequency of vibration rollers can be real-time controlled according to the compaction materials,the control principle of vibration frequency and the genetic algorithm of PID parameters setting and optimization for control system were studied based the model.Then the vibration frequency control system of vibratory rollers was developed and its field test was accomplished.The results show that the response of vibration frequency control system is very quick and its performances are stable,in which the best vibration frequency can be set in control system according to different compacted soils.

The vibration road roller system is simplified into a particle(drum) and two freedom degrees(horizontal and vertical directions) dynamic system.And at the same time,the qualities of soil mass can be taken as the additional quality to the vibrating particle point.Accordingly,a dynamic model with a single particle point and two freedom degrees is established.The analytical expression of the trajectory is obtained by solving the vibration equation of particle system.The functional relations between particle trajectories and various vibration parameters are studied by the numerical analysis.And the effect of parameters on the trajectory is discussed.Research results indicate that changing vibration parameters can achieve the effective controlling over compaction degrees.Accordingly,in the course of concrete construction,each vibration parameter of vibration road roller can be adjusted in terms of compacted material properties so as to achieve the real time monitoring of vibration operational conditions.

Symmetrical type Zirconia/Stainless steel(ZrO2/SUS316L) functional gradient materials(FGM) were fabricated by tape casting.Distributions of component and residual thermal stress were analyzed using component distributed function and classical lamination theory.The microstructure was observed and the micro-hardness was also characterized.The result showed symmetrical type ZrO2/SUS316L FGM with graded components and better bonding at interlayers were obtained by tape casting.Comparing with ZrO2/SUS316L Laminated Composites Materials,maximum residual thermal stress of FGM was far less than it,and FGM had thermal stress relaxation obviously.

ZrO2 pipe and SUS316L pipe were fabricated by multi-tape casting on the curved surface of a cylinder using ZrO2 and SUS316L slurries.Influence of the viscosity of the slurry on thickness uniformity of green sheets was investigated.And then six kinds of slurries were cast on the curved surface in the order that the ZrO2 content was reduced sequentially.ZrO2/SUS316L graded pipe with regular shape was successfully obtained by inducing the residual stress as a result of optimizing shrinkage.The experiment results show that the thickness error was less than ±5% when the viscosities of slurries are range from 1200 to 2000 mPa·s.In order to reduce the residual stress,the binder content should be increased with increasing ZrO2 content so that the difference of shrinkages is decreased.

针对水轮发电机组筒式水轮机导轴承的润滑不良问题,以大型数学计算软件Matlab为工具对其润滑油膜承载力的分布即润滑油膜Reynolds方程(油膜压方程)进行了全新求解。首先利用五点差分法离散水导轴承压力方程并建立相应的代数方程模型;然后利用Matlab编程计算,定性探讨了不同偏心率下筒式水导轴承的油膜压力分布情况,并给出数值分析三维网格结果图形分布;最后,从所得压力分布情况,推出了润滑油膜力的非线性,且随着水导轴承偏心率的不同,主轴径向力和油膜承载力也随之相应变化。

A method of modern fluid machinery design——design fluid machinery based on CAD/CFD system was introduced,the aerofoil using the computer aided design was optimized according to the result of CFD.It was showed that the method can reform the flow,improve the capability.

介绍了一种新型的面向PLC的通用控制程序开发平台CADEPA,它可以用GRAFCET(IEC─1131标准)语言对多种型号的PLC进行统一的编程,并实现在线监控.