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应用发动机专用仿真软件AVL_EXCITE进行了发动机活塞-活塞环-气缸套副的动力学分析,获得了活塞在气缸内的拍击运动参数和活塞与气缸套碰撞力。提出了一种发动机活塞表面的磨损趋势的预估方法,并进行了仿真分析研究。根据仿真计算结果模拟了发动机运转过程中活塞与气缸套接触状态,得到了作用在活塞表面每一点上的接触力,根据其接触力模拟了发动机活塞磨损状态。模拟结果表明能够准确地预测到在不同活塞与气缸套间隙下的活塞拍击运动特性及表面磨损情况。 相似文献
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论述了小型航空汽油发动机活塞的工作特点,结合发动机活塞设计实例,论述了活塞材料、结构及型面的设计原则和方法。试验结果表明,通过活塞的改进设计,进一步提高了发动机性能。 相似文献
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孔令来 《机电产品开发与创新》2004,17(5):47-49
本文介绍了发动机活塞敲缸的经验诊断方法,通过求解CA1091汽车发动机活塞运动方程,得出了发动机活塞敲缸与结构参数、转速、负荷和润滑油粘度的关系,从理论上得到诊断发动机活塞敲缸的最佳转速、传感器安装部位、负荷和相位等。 相似文献
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通用航空活塞发动机现状及发展趋势探讨 总被引:1,自引:0,他引:1
《内燃机与配件》2020,(19)
阐述了通用航空产业发展现状,从技术角度论证了活塞发动机两种研制路线及两种燃料选取的优缺点,结论认为:活塞发动机为动力的通航飞机将在一定时间内占据主要地位;“汽车改”研制路线在研制航空活塞发动机方面具有更大的可行性,采用航煤或柴油作为燃料的航空活塞发动机将更受使用者青睐;在此基础上为研制单位提出了正向研制活塞发动机应重点考虑的关键技术和零部件供应链问题。 相似文献
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连杆是往复活塞式发动机中能量转换的核心部件,对连杆进行疲劳寿命分析就尤为重要,本文从分析计算连杆疲劳强度试验条件出发,介绍了一种连杆疲劳强度试验的方法,对提升连杆质量具有指导意义。 相似文献
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The main aspects of the relationship between fatigue and machine part wear are considered and the relevant problem is formulated. The results of an investigation of the influence of the fatigue process on machine part wear are given for diesel engine piston rings. As the results show, the solution of the problem could open up new prospects in the development of the theory of machine part cyclic wear and the details of the technology of cyclic straining treatments for increasing fatigue wear resistance. 相似文献
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为满足YZ4105ZQ型废气涡轮增压柴油机对活塞的使用要求,研制液态模锻法生产陶瓷短纤维局部增强铝基复合材料活塞,采用金相显微镜观察复合材料增强部位的金相组织,测试复合材料的高温力学性能,并采用扫描电镜观察拉伸断口形貌;复合材料活塞装机后进行了600h台架可靠性试验和500h台架热冲击试验。试验结果表明,复合材料活塞的增强部位纤维分布均匀,与未增强的活塞裙部界面结合过渡平缓,陶瓷纤维与铝基体之间的结合良好;体积分数为15%的Al_2O_(3f)/ZL109复合材料在613K的高温抗拉强度达到132MPa,比未增强基体铝合金高50%左右;使用复合材料活塞装机的YZ4105ZQ增压柴油机,通过了600h台架可靠性试验和500h热冲击试验,整机的性能指标优于设计要求;复合材料活塞的尺寸稳定性、耐磨性等均表现良好,符合装车要求。 相似文献
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Yeow-Chong TanZaidi Mohd Ripin 《Tribology International》2011,44(5):592-602
The secondary motion of the piston head of a motorized engine is captured using two laser displacement sensors to obtain the piston motion and tilt angle. The controlled parameters of the measurement are engine speed, quantity of oil and oil-fuel mixture and its ratio. The reduction in friction force is more significant at dead center at high speed as the quantity of oil supplied increases. Changes in tilt direction of piston head occur at the inlet port. The relationship between the friction force and piston tilt angle showed weak correlation at low speed and increases with the engine speed. 相似文献
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Tribological performance of three advanced piston rings in the presence of MoDTC-modified GF-3 oils 总被引:1,自引:0,他引:1
Ma Yajun Zhao Wancheng Li Shenghua Jin Yuansheng Wang Yucong Tung Simon 《Tribology Letters》2005,18(1):75-83
The piston assembly (piston ring and cylinder bore) is one of the key parts of the internal combustion (IC) engine. Its performance will directly determine the performance of the whole engine. The piston assemblys tribological performance will be influenced by both its mechanical properties and the tribochemical interactions that take place on their surfaces. In this paper, three kinds of advanced stainless steel piston rings with a single nitrided layer, CrN coating on the nitrided layer and a B4C and CrN binary-layer coating on the nitrided layer, respectively, were employed. Their frictional behavior and wear performance, when sliding against the cast iron cylinder bore materials lubricated with two kinds of GF-3 category mineral-based engine oils (one of them blended with MoDTC friction modifier), were investigated on a SRV tribotester. The test conditions were set and maintained to simulate engine-operating conditions. SEM (Scanning Electron Microscopy) and EDX (Energy Dispersive X-ray spectroscopy) were employed to characterize the morphology and elemental composition of the wear tracks. Tribotests and analysis results indicate that changes in both the mechanical properties of the tribomate (piston coatings) and tribochemical interactions (formulation of engine oils) have an impact on the tribological performance of the piston assembly. Tribochemical interactions will have a more obvious influence on friction coefficients while the mechanical properties of the tribomate have a more obvious influence on wear. 相似文献