Dynamic Analysis Of Fatigue Experimental Machine Based On ANSYS

With the development of technology and industry,machines have become more speedy and light and the environment of mechanical structure becomes more complex,so the vibration problem of structures has drawn people's attention,even worse,vibration has arose serious accident,statistics materials show that 40 percent of aerocraft accidents are related with vibration,as to our country's thermal power generating units, very serious accidents which vibration is the main factor have happened more frequently within 20 years.Vibration problems have emerged not only in the industrial section such as aviation and electric power,but also in the fields like spaceflight,mechanism,architecture,water conservancy and traffic.The vibration will produce many side effects:intensive vibrations will affect the normal work of instruments and meters;they affect workers' comfort and environment;they endanger the safety and reliability of mechanical structures;they also affect the product's function and quality.this kind of accidents not only lead to large economy loss,but also bring bad social influence.they also arise the workers' psychologic pressure. The mechanical structure design improves with the development of technology and society,it had developed from empirical design to the combination between design and mechanical analysis,up to modern optimized design of structure,but as to strength,the structure design is still based on static criterion,then measures are adopted to control the vibration level,even the serious vibration problems have come out.Practise has proved that this method is costly and less effective.thus,the traditional mechanical structure design method based on static criterion can't meet the needs of modern product design,as to the structure which endures dynamic load,dynamic design method is an effective method as to modern product design because it can control the vibration level of mechanical structure,improve the quality of product,increase its reliability and so on.this dynamic method suits the direction of design technology of mechanical structure.The dynamic design is defined as:at the design stage,the structure is designed according to the function,strength and the dynamic environment,the structure has excellent dynamic property and our purpose which control the vibration level is achieved. Material fatigue experimental tester is used to measure the fatigue intensity of material or part.It is widely used in industry enterprise and universities. When it is working, the sample is clamped by the clampers, and is forced to vibrate by the hydraulic cylinder.In that way ,we can get the fatigue intensity of the sample.In its working condition,the tester vibrates because of the the sine excitation, which decrease the working precision, consume energy and generate noise.So it is very...