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主质量
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  main mass
     This paper sets up the mechanical model of the main mass and dynamical vibration absorbers by the academic research and much numerical calculation, and gets the optimal installation position and mass of the vibration absorbers, the range of damp coefficient and rigid coefficient by the method of optimum design.
     通过理论研究建立主质量和动力吸振器组成的力学模型及大量的数值计算,用优化设计的方法获得最佳吸振效果的吸振器的安装位置和质量、阻尼系数和刚度系数的变化范围.
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  “主质量”译为未确定词的双语例句
     Studies are conducted in this paper to analyse and compare the random vibration dynamic absorber whose main vibration system is stimulated respectively by extraneous force or foundation. According to the optimal object of the minimum of the main quality displacement variance, it is derived that two kinds of computation formula of the optimal parameter based on the random vibration dynamic absorber.
     对主振动系统分别受外力激励和基础激励的随机振动动力吸振器进行分析比较,以主质量位移方差最小作为优化目标,提出了两类基于随机振动的动力吸振器最优参数的计算公式。
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     Quality.
     质量
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     QUALITY
     质量
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     A Review of the Quality of Welding Seams in Power Station Main Steam Piping
     火电厂蒸汽管道焊缝质量概述
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     Quality Control during Production of Main Cables of Suspension Bridges
     悬索桥缆生产过程中的质量控制
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  main mass
The main mass of bottom sediments in the reservoir is markedly enriched in Cd, Mg, Mn, Sr, Ni, Cr, Sb, V, and Pb, but they are depleted in Cu, Mo, Zn, and Li, relative to the soil and loam.
      
They propose a simplified method of determining the startup characteristics when the main mass of heat transfer agent is frozen in the heater zone.
      
The amount of peripheral proteins does not exceed one third of the total protein, whereas integral proteins account for the main mass of proteins of microsomal membranes in the brain of animals at all levels of the vertebrate organization.
      
An investigation was made of the ribonucleic acids, which take an active part in cytoplasmic biosynthesis of the protein forming the main mass of meat tissue in the animal.
      
Thus, the separation of Mn and Fe and of both from the main mass of Si-Al-components can take place.
      
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A simple and reliable numerical method was used to investigate the performance of impact damper in detail. Large amounts of calculating results support substantially our following views: The impact damper can greatly reduce the main system's vibration when the exciting frequency is near the natural frequency, and it is specially useful to restrain the friction between the free mass and the main mass is a disadvantageous factor for the impact damper. The hypothesis that the response of main mass displacement...

A simple and reliable numerical method was used to investigate the performance of impact damper in detail. Large amounts of calculating results support substantially our following views: The impact damper can greatly reduce the main system's vibration when the exciting frequency is near the natural frequency, and it is specially useful to restrain the friction between the free mass and the main mass is a disadvantageous factor for the impact damper. The hypothesis that the response of main mass displacement has the same period of harmonic excitign force taken by some previous scholars seems unreasonable, although it's necessary in simplifying the treatment of problem. The results of the investigation have shown that the peak value of main mass's displacement varies under harmonic excitation. The dissipation of energy due to the impact isn't the dominant factor in the process. All the relevant factors such as free mass ratio, gap ratio, etc, have complex effect on the perforrmance of an impact damper.Experiments were made, and both the results of experiments and numerical simulations coincide closely.

本文用简单可靠的数值仿真方法对冲击减振器进行了全面研究。研究结果表明:冲击减振器在其主系统的固有频率附近有很强的减振能力,因而特别适用于抑制机床颤振。冲击块与主质量之间的摩擦是冲击减振器的不利因素。碰撞消耗能量也不是冲击减振器减振的主要原因。 实验和数值仿真的结论相符。

Studies are conducted in this paper to analyse and compare the random vibration dynamic absorber whose main vibration system is stimulated respectively by extraneous force or foundation. According to the optimal object of the minimum of the main quality displacement variance, it is derived that two kinds of computation formula of the optimal parameter based on the random vibration dynamic absorber. The calculating results show that these formula are effective, and the effect of reducing vibration is satisfactory....

Studies are conducted in this paper to analyse and compare the random vibration dynamic absorber whose main vibration system is stimulated respectively by extraneous force or foundation. According to the optimal object of the minimum of the main quality displacement variance, it is derived that two kinds of computation formula of the optimal parameter based on the random vibration dynamic absorber. The calculating results show that these formula are effective, and the effect of reducing vibration is satisfactory. This paper will be of theoretical value in the designing and using of dynamic vibration absorber.

对主振动系统分别受外力激励和基础激励的随机振动动力吸振器进行分析比较,以主质量位移方差最小作为优化目标,提出了两类基于随机振动的动力吸振器最优参数的计算公式。通过算例分析,吸振效果明显,证明所给公式是有效的,这对动力吸振器的设计计算和使用选择具有理论指导意义。

A piezo impact drive mechanism was developed for precise approach and manipulation of micro\|targets. It consists of one main mass, one counter\|mass and one connecting piezo element. Rapid extension and slow contraction of the connecting piezo generate impulsive forces which push or pull the main mass rapidly move with a tiny step. This mechanism has been successfully used to precisely approach and position the micro\|probe during cell manipulation. Some experimental results for comparison were presented.

介绍一种用于微细进给与操作的压电陶瓷冲击驱动机构 ,由主质量块、配重块和压电陶瓷三者组成 .交替控制压电陶瓷的快速伸长与缓慢收缩 ,配重块将不断获得动量 ,以一定的冲击力推动主质量块作快速而微细的步进运动 .该机构可广泛应用于对微观目标的驱动 .本工作利用冲击驱动机构进行活体细胞的无损操作 ,实现微探针与细胞之间的精确进给和定位 ,得到理想的实验结果

 
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