The Study Of Experimental Model Analysis For Structural Distortion Of ICE Engine Parts

The main spare parts of internal combustion engines always works under the heavy load and the high speed condition .They withstand the complex sound of something astir load. In order to make the structure stable, reliable, light and has less vibration and noise, we should design the intensity and the static rigidity of the structure as well as carry on studies of the dynamic characteristic, the dynamic-load stress, weary, vibration, noise and so on. In the past time we mainly depended on the experience when making or revising the structural design .When a spot damages, we take measures; when a component damages, we reinforce it. These means have certain blindness not only can cause the dead weight increase, moreover fundamentally has not solved the problem.The model analysis method has provided the effective method for the dynamic analysis of internal combustion engine structure. Through exerting the drive to the structure system, studying the relations between the response signal and the drive signal in each place in structure system and through the parameter recognition, calculating the parameter such as the natural frequency and the model in the various steps of the structure system .exposing the problems existing in the structure , we may carry on the appraisal estimate to the vibration performance of the structure system and indicate the direction for its dynamic characteristic optimization design.Some organizations overseas are now studying this technology and has editing some soft-wares to make the use of model analysis to study the structure dynamic characteristic to become possible. At present, this technology has already been applied in the aerospace and other project domains. But these soft-wares have the certain flaws in input aspect and output way as well as project application. Moreover, the procedure permanent encryption, the price is extremely expensive and so it is not favorable for the domestic development application. At 1990', several universities start research on this aspect. But many work is only restricted in the discussion of analysis method and the theory. It lacks the thorough research to it in the actual project application, especially very little application in the internal combustion engine product design. This topic designs a set of more perfect system of experimental model analyses to satisfy the need of the main parts of the internal combustion engine and other mechanism experiment analyses. This system uses the strength hammer or the driver carries on the drive to test the samples, uses the advanced measuring instrument and the mature frequency range method to carry on the data acquisition and the parameter recognition. Through the analysis of structure model frequency, inspiring and so on model parameter to study the structure dynamic characteristic of the structure.Through carrying on the experimental model analysis with this system to the SD1105 diesel engine cylinder block, some problems of the body structure have been discovered. According to result of the test, we can make some optimized improvements to the cylinder block and solve the cylinder block ' s break problem, enhance the production batch in a large scale, reduce 1. 5kg of the single structural weight and win the remarkable economic efficiency for the factory.The success of this topic studies may provide one effective method for this profession structure dynamic characteristic optimization design, may greatly reduce the product design development cycle, saves the man power and the physical resource, raises the design level, improve the operational reliability, reduce the energy consumption, the absorption of shock noise reduction, prevent the break of the structure of the product.