Using regulated nozzle can improve the ramjets " performance and missiles " maneuverability . the regulated nozzle has many moving parts in work 可调喷管在结构上存在活动部件和流道联接部件，流道型面在工作中存在变化。
Art characterized by the incorporation of painted and sculpted mechanical parts into an art piece that moves or creates the impression of movement 兴起于20世纪中期的一种与机械学相结合的艺术，采用活动部件，造成动感效果的雕塑艺术。
The derrick to be laid down on deck , cargo blocks , span takles , guide rollers and all moving parts of derrick of derrick to be dismantled . cleaned and greased with special grese 吊杆放置甲板上，吊货滑车，调节跨幅复式滑车，导轮及吊货杆上所有活动部件拆开，清洁，加优质润滑脂。
Reduced maintenance is assured because the disc is the only moving part and is designed to minimize flutter in the closed position , thus reducing wear on the pivot pin , disc , and seat 确保节省维护费用，因为阀瓣是唯一的一件活动部件，这种结构将关闭位置的振动减小到最小程度，因此减少了枢轴销、阀瓣和阀座的磨损程度。
In this way , supersonic fluid amplifier especially bistable valve with negative pressure switch is used in the rocket projectile thanks to its advantages of switching rapidly , the ability of low temperature air to control the high temperature gas and no moving parts in high temperature gas 超音速射流双稳阀，特别是采用负压切换的超音速射流双稳阀因其具有切换快速、可用低温气流控制高温燃气和在高温燃气中无活动部件的优点而适用于火箭弹的姿态控制系统中。
Compared with traditional mechanical and optic gyros , hrg has such advantages as no high speed circumvolving or moving parts in structure , no warm - up time and short start - up time , wide signal band in frequency , low excursion noises , great endurance in over loading , nuclear radiation and short time power off , small bulk , light weight , low power cost and long life , which is suitable for space applications 与传统的机械陀螺和光学陀螺相比,半球谐振陀螺具有如下优势:结构上无高速转子、无活动部件;不需预热,启动时间短;信号频带宽,漂移噪声低;能承受大的机动过载;抗核辐射,并可经受短时间电源中断的影响;体积小,重量轻,功耗低,寿命长,非常适合空间应用。
By applying hybrid coordinates method , dynamic equations of motion for a satellite system which includes central rigid body , momentum wheels , rigid rotational components and flexible solar arrays are given . together rotational dynamic equations for flexible solar arrays and rigid rotational components are presented 采用混合坐标法,建立了包含中心刚体、动量轮、刚性转动部件、挠性帆板的卫星系统的动力学方程、帆板转动动力学方程、帆板挠性振动动力学方程和活动部件转动动力学方程。
So can amount of displacement measured comes with hall1 s component it has small inertia , respond and wait for the characteristic quickly , except that hall must move with the unit under test in succession component , there are not other activity parts , so can avoid the disadvantages , such as frictional force , mechanical breakdown , etc . , adapt to doing the on - the - spot trends to test very much 因此可以用霍尔元件来测量位移量。它具有惯性小，响应快等特点，除了霍尔元件须与被测部件连动外，无其他活动部件，因此可避免摩擦力、机械故障等弊病，很适应做现场动态测试。
