基于非线性的发动机气缸垫密封性能研究

以某汽油发动机金属气缸垫片为例,研究在受到螺栓预紧力时考虑非线性因素下金属垫片的密封性能,并通过有限元分析软件对气缸垫片进行仿真分析,最后将分析结果与面压实验进行对比。结果表明,在仿真分析过程中考虑非线性因素更能体现气缸垫接触面的真实应力。观察面压实验结果与仿真分析结果,提出了一种简化气缸垫片的分析方法并对其结果的准确性进行了验证。本次研究既考虑非线性对气缸垫片接触压力的影响,也提出了一种新的气缸垫片仿真分析方法,同时此方法可以被其它密封产品的仿真分析所借鉴。使用这种分析方法可以在保证计算精度的同时极大的缩短计算时间,降低计算成本与研发周期。对气缸垫片密封性能的研究具有重要的意义。

基于双向耦合的东安513型发动机整机多物理场研究

以东安513型汽油发动机整机为例,基于ANSYS有限元分析软件对其进行流体场、瞬态温度场以及瞬态结构场的多物理场双向耦合研究,实现了对发动机实际工况下的有限元分析。研究了发动机整机在实际工况下的受力以及密封情况,并对现有发动机组合结构存在的密封缺陷进行优化调整。文中详细阐述了在分析过程中涉及到的关键技术和要点,并最终获得了发动机整机实际工作状态下的多个结果云图。根据分析结果云图可以发现,发动机在热载荷、螺栓预紧力以及爆破压力的共同影响下,会使整机发生一定的形变,这种变形会影响其工作状况下的密封性能。通过对分析结果的研究,最终选择调整螺栓预紧力的大小和分布来提高发动机密封性能。

Synthesis and Cytotoxicity of the First Arene Ruthenium Compound Containing Two Thiosemicarbazone Ligands

A Ru-arene compound containing two thiosemicarbazone ligands [(η6-p-cymene)Ru(TSC)2 Cl]Cl(1, TSC = benzophenone 4-methylthiosemicarbazone) has been synthesized and characterized by 1 H NMR, elemental analysis and HR-ESI mass spectrometry analysis. The molecular structure was determined by single-crystal X-ray diffraction analysis. The in vitro anticancer activities of the complex have been evaluated against two human cancer cell lines(SGC-7901, BEL-7404), and the IC50 values are 32.5 and 57 μM, respectively.

Synthesis and Anticancer Activity of a New Di-nuclear Ruthenium Arene Compound with Thiosemicarbazones

A new di-nuclear ruthenium arene compound containing thiosemicarbazone ligands, [Ru(η6-cymene)(TSC)Cl]2(PF6)2(2), was synthesized and characterized by 1H NMR, HR-ESI-MS, and elemental analysis. Furthermore, the complete structure of 2 was determined by single-crystal X-ray diffraction analysis. Density functional theory(DFT) calculations with B3LYP functional and LANL2DZ(for Ru)/6-31G*(for other atoms) basis sets were carried out for the reactions involving complexes 1 and 2 in order to understand the formation of the complexes. The in vitro anticancer activities of the compound were investigated against five human cancer cell lines(SGC-7901, CNE-2, HepG2, KB and HeLa), and the IC50 values are 39.5, 45.8, 49.8, 54.5 and 61.8 μM, respectively.