| 1. | High chromium cast iron has higher erosion resistance at lower impact angle , while the erosion resistance is worse for the lower toughness at normal impact
高铬铸铁在低角冲蚀时有较高的耐冲蚀性，但高角冲蚀时由于脆性大，易崩裂。 |
| 2. | For a impact process with a normal impact velocity , the control equation for rkpm was deduced based on a small strain and incremental elasto - plastic constitutive law
针对冲击速度较低的情况，假设冲击过程为小应变，并引入弹塑性增量本构关系，推导出冲击过程的再生核质点法计算控制方程。 |
| 3. | The dominant parameters on the anti - erosion proportion of materials are rigidity and intensity at lower impact angle , while the main parameter is toughness at normal impact . the ni - based alloy coating and ni - based alloy / sic coating have been obtained by laser cladding
决定材料抗低角冲蚀磨损性能的主要因素是硬度和强度，抗高角度冲蚀能力取决于材料的韧性，在实际应用中需要综合考虑这几个因素。 |
| 4. | Compared with any vibrating systems involving normal impacts , an oblique - impact vibrating system features not only the non - smooth characteristic of impacts , but also complicated dynamics owing to the relative tangential velocity and corresponding friction between two colliding objects
斜碰撞振动系统不但具有正碰撞振动系统力学状态的非光滑特性，还由于相对切向速度和摩擦引起碰撞物体的切向变形，因而具有更大的研究难度。 |
| 5. | But the noise made when the door is closed is far beyond national correlative standards , and make serious noise pollution . the article put emphases on the mechanize of the electric control door through experiments on the spot and emulation of computer , then advance that the root of noise is that the design has defects . the safe close of the door is depended on the impulsion of door normal impacts
本文密切关注了这种与大众生活相关的研究课题，通过实测实验和计算机系统仿真，重点研究了电控门工作的机理，提出了电控门噪音产生的根源是设计存在重大缺陷?电控门的安全闭合必须依靠门体正撞产生的冲击力，并且没有相关降噪措施，必然在使用造成巨大噪音的结果。 |
| 6. | By means of researching the meshing impact in the engagement of standard chain respectively with the spur toothed sprocket and the involute toothed sprocket , it has been discovered through analysis that by adopting the involute tooth for the sprocket could reduce the normal impact velocity in the engaging instant of chain and sprocket , thus lowered the meshing impact among chain and sprocket
通过研究标准链条分别与直齿链轮和渐开线齿链轮啮合的啮合冲击，分析发现在链轮上采用渐开线齿能减小链条与链轮啮合瞬间的法向冲击速度，进而降低链条与链轮的啮入冲击。 |
