vibration

• Annoying sounds and inaudible vibrations have caused problems with some experimental wind machines .
  某些实验风力发电机确实存在着噪声和无声振动问题。
• An instrument of the second type makes use of a metal reed kept in vibration by an electromagnet .
  还有一种类似的装置，由电磁铁维持金属簧片不断振动。
• An instrument of the second type makes use of a mental reed kept in vibration by an electromagnet .
  还有一种类似的装置，由电磁铁维持金属簧片不断振动。
• Equation(4－198)yields a first approximation for the change in the natural frequency of vibration .
  方程（4198）给出了一级近似下的固有振动频率的改变量。
• Skeletal vibrations are usually very sensitive to changes in the immediate environment of the vibrating group .
  骨架振动常因振动基因的环境变化而十分敏感。
• The vibrations are amplified electrically and can be heard through loudspeakers in the operating room .
  这种震动通过电流放大后，就可以从手术室的扩音器中收听到。
• The study of vibration is concerned with the oscillatory motions of bodies and the forces associated with them .
  振动的研究涉及到物体的振荡运动以及与此有关的力。
• When the structural vibrations are in turn excited by engine operation, a closed loop relationship exists .
  当结构振动是由于发动机工作所激励时，存在一闭合回路关系。
• A vibration period tends to decrease or remain constant as energy is lost, as is the case for a pendulum .
  在损失能量时，振动周期倾向于减小或保持不变，如同单摆那样。
• These clocks depend on electricity and the vibrations of the atoms of a quartz crystal, and are very complicated .
  这些钟靠电和石英晶体的原子振荡走时，是十分复杂的。