| 1. | The frequency of oscillator is the highest in china now . cylinder misfire , crack on crankshaft and cylinder score can be diagnosed by diagnosis part
诊断系统的规则简单实用，系统具有良好的开放性，并便于修改和移植。 |
| 2. | Then the cylinder scoring malfunction of internal combustion engine is introduced briefly . it refers to the main content of this thesis , and the researching significance and purpose are indicated
然后简要介绍了内燃机的拉缸故障，提出了本文研究的主要内容，并指出了研究的目的及意义。 |
| 3. | This achievement creatively improves the traditional research on the problem of cylinder scoring which is conducted mainly by experiment and experience to a new step of numerical simulation
这一研究成果使传统上以实验研究和运转经验为主的拉缸问题研究提高到了一个数值仿真的层次，具有首创性。 |
| 4. | Two models of friction are proposed , the simulation results show together : kurtosisness of torsional vibration will decrease , low harmonic and main harmonic of torsional vibration will increase when cylinder scoring
创造性地利用了扭振信号诊断柴油机拉缸故障。拉缸时，由于摩擦阻力的增大，发动机喷油量达到最大。 |
| 5. | Also a special diagnosis system for the cylinder scoring malfunction of internal combustion engine has been briefly set up . it realizes the numerical simulation of bi - dimensioned and tri - dimensioned cycling instantaneous temperature field for the diesel engine type 4135 and the simulation animated demonstration of the thermal deformation and cylinder scoring malfunction
并且还初步建立了内燃机拉缸故障诊断分析型专系系统，实现了4135柴油机二维、三维循环瞬态温度场的数值仿真、热变形和拉缸故障的模拟动画演示。 |
| 6. | A open - close mathematic model is introduced into calculation of torsional vibration . results show : kurtosisness and high harmonic will increase when crankshaft have crack . 5 . cylinder score is also diagnosed by torsional vibration in this paper , when cylinder score occurring , the friction of piston will decrease the action of air pressure
本文借鉴了裂纹转子刚度的开闭模型，首次对含有变刚度单元的柴油机动力装置进行了扭振计算，结果表明柴油机曲轴有裂纹后，扭振的角位移和附加振动力矩的高谐次分量会增加，峭度值增加。 |
| 7. | For the first time , it puts forward a conception of . thermal dynamic simulation and sets up a supposed analytical theory for scuffing failure and cylinder scoring of piston assembly and cylinder liner . that is followed with the simulation of scuffing failure and cylinder scoring of internal combustion engine under the condition of stopping cooling water supply and over loading
首次提出了热动态仿真的概念，第一次大胆假设了活塞组、缸套擦伤、拉缸时的分析理论，模拟出了在中断冷却水和超负荷状态下柴油机的擦伤、拉缸。 |
