Research Of Parameter Design For Combustion Engine Elastic Coupling

Couplings are almost used in every area of transmission mechanisms. They are indispensable link part of machinery. Elastic coupling is a coupling that interior contains rubber or plastic elastic materials. Therefore it has the function of cushion vibration. They found the coupling fracture phenomenon when they made the engine test from an engine research institute. They suspected that it was caused by the coupling with the diesel version mismatched. So it needed to find the reason of the break urgently.This article made some poetic couplet axis inertia, stiffness, damping, parameter design from the avoidance of large shafting torsional vibration. For diesel engine coupling system this paper made a study on the parameter design method and gave the diesel engine coupling system designing flow. It has a certain project practical value that can be consulted by each unit.This paper put some points of the design first. With the12V150and6L128type diesel engine as the research objects.we confirmed the first two order torsional vibration models by the free torsional vibration and forced torsional vibration analysis. The internal combustion engine torsional vibration amplitude is larger in low speed because the shaft vibration and elastic coupling mode. The main harmonic amplitude is larger and inevitable in combustion engine speed range. So we must consider the main harmonic amplitude resonate phenomenon, when we design the elastic coupling we should reduce the main harmonic amplitudes, also we should reduce the lower0.5,1.0harmonic amplitudes.We analyzed different inertia, stiffness and damping influencing law on the torsional vibration characteristics. We also found that coupling inertia too great may lead to shock absorber and the shaft mismatched.The stiffness of the coupling may influence coupling modal inherent frequency. Coupling stiffness have not effect shock absorber modal and crankshaft modal.It provided a basis for elastic coupling design parameter modification.According to the the torsional vibration calculation problem in coupling design of non steady working condition, the thesis developed non steady working condition of shafting torsional vibration calculation program with the C++Builder6.0based on frequency response method in the calculation of shafting torsional vibration algorithm from internal combustion engine laboratory of Southwest Jiao Tong University. And the thesis compared calculation results with the experimental results to check the accuracy of the procedures. By combining the torsional vibration calculation program in non steady condition and the torsional vibration calculation program in steady condition,"TVCA"from Southwest Jiao Tong University it developed a software with the function of both the torsional vibration calculation in non steady working condition and the torsional vibration calculation program in steady working condition. Using of the software we discussed torsional vibration amplitudes and additional inertia characteristics on the non steady condition and found the torsional vibration amplitude on the non steady condition with speed rate increasing decrease. We also found that the additional inertia may lead the coupling damaged.It set the flow of diesel engine coupling design combining the torsional vibration calculation and test.The thesis found the method of the coupling parameters matching analysis and evaluation.According to the coupling design flow chart, take the designed suitable elastic combining parameters of one type diesel engine for example. Detailed the selection of elastic coupling parameters and calibration method.It provided the elastic coupling design examples.for readers...