Synthesis And Application On Textile Of The Shape Memory Polyurethane

With the car in people's lives play an increasingly important role,the people on the vehicle idling vibration requirements are getting higher and higher,and gradually become an important indicator of the evaluation of the vehicle comfort.This paper describes the progress of the vehicle identification and vibration control technology in recent years.It described the causes of the vehicle vibration and transmission path.It describes the various evaluation,testing,analysis,and control method of the vehicle vibration.Combined with Beijing automobile idling vibration problem of the model of a car,through testing and certification,confirming the cooling system has a greater impact on vehicle idling vibration.By reducing the validation test of the cooling fan unbalance,can effectively reduce vehicle idling vibration.Also by optimizing the cooling system fan speed double elimination Beat two similar fan speed generated by,so as to enhance the performance of the vehicle idling vibration.The cooling system was found to Z of second order with the engine rigid body modal frequency excitation resonance frequency,resulting in a greater impact on vehicle performance by idling vibration test analysis.By NASTRAN model analysis to guide the direction of the rigid body mode to optimize cooling systems,thereby eliminating resonance.The simulation analysis of experimental verification scheme,vehicle idling vibration performance has been significantly improved.Cooling fan unbalance control proposed in this paper,as well as dual cooling fan speed control to avoid Beat,additional cooling system to be rigid body modal frequency of the engine idle speed to avoid second order excitation frequency,the cooling system to prevent the occurrence of resonance,thus affecting the performance of vehicle idling vibration.Vehicle idling vibration to enhance performance is relatively good reference,and its own brand development of new cars models have better guidance.