To make an rpm-drop test, a tachometer is needed .
做每分钟转速下降试验时，需要一个转速表。
The effects of liquid sloshing on spinning stability of satellite are investigated by means of drop test.
利用落塔试验研究液体晃动对卫星自旋稳定的影响。
FEM software, ABAQUS, is used to model the landing gear for an aircraft, and carry out the numerical simulation for drop test.
利用大型商用有限元软件ABAQUS对某机起落架建模，并进行落震试验数值模拟。
Three structure tests on bulbous bow of naval ships were conducted:static compressive test, heavy drop test and explosion test.
作为船体中比较特殊的双曲结构，舰船首部的球鼻首相关的结构试验规范很少。
MDP-1 type controller for harmonic test and current sudden drop test as well as some problems in the practical testing were introduced.
介绍了MDP 1型谐波及骤降试验控制器及其在实际运行中遇到的一些问题。
A landing gear drop test method is presented in this paper, in which the lift is simulated by an air actuator and accumulator system with constant pressure.
结合某型号飞机试验任务，阐述有关空气作动筒仿升的起落架落震试验方法。
After analyzing and discussing these results of drop test, a reasonable imitation style of spin up and spring back on the column style drop test bed is proposed.
通过对这些落震试验结果进行分析和讨论，得出了在立柱式落震试验台上进行落震试验时合理的起转和回弹载荷的模拟方式。
The methodologies for free drop test and bending test are introduced, considering the important effect of mechanical stress on the reliability of lead-free BGA packaging.
着重研究了机械冲击和应力对无铅BGA 封装焊点可靠性的影响，介绍了BGA 封装的可靠性力学试验（跌落、弯曲试验）及其分析方法。
The status of an undercarriage at the touchdown instant is studied by analyzing the undercarriage parameters which change with the wheel rotational speed in the drop test.
以某歼击飞机前起落架为例，用落震试验的方法，通过分析起落架有关参数随机轮转速变化的情况，来研究飞机着陆瞬间起落架的状况。
The test centre will be fitted with more than 230 test rigs, which will include 40 heat pump test rigs, 21 climatic chambers as well as a drop test and wind test laboratory.
中心内将配备230多个测试平台，其中包括40个热泵测试平台，21个气候试验箱以及一个落震和风力测试的实验室。
The method of direction distinguishing not only is that used in heat transfer data processing of heat exchanger, but it is also used to find the solution of norm equation for pressure drop test.
方向鉴别法不仅可以用于换热器传热试验数据处理，也可用于压力降试验准则方程的求解。
This paper described a small type drop-test shock machine with long duration of shock pulse. Thispaper analyzed its construction characters, operation principle and wave forms of shock test.
介绍一种长脉冲持续时间的小型跌落冲击台，并对其结构特点、工作原理、冲击试验的波形进行阐述与分析。
This paper described the characteristics of major shock and secondary shocks in drop-test.
本文阐述了在跌落冲击试验时主冲击与次冲击的特点。
The characteristics of major shock and secondary shocks in drop-test are described in this paper.
本文阐述了在跌落冲击试验时主冲击与次冲击的特点。
The secondary impact acceleration pulse which is produced by the drop-test can influence the testing parameters and cause fatigue and damage of components.
凸轮式跌落冲击台产生的次冲击能够影响试件的测试参数和性能，并能造成试件的疲劳损伤与失效。
The Construction principle, mechanical properties, basic shock parameters and adjustment methods of cam-type drop -test shock machine are described.
阐述了凸轮式跌落冲击台的结构原理、力学性质、冲击参数与其调整方法。
The construction principle, mechanical properties, basic shock parameters and adjustment methods of cam-type drop-test shock machine are described.
阐述了凸轮式多次跌落冲击台的结构原理、力学性质、冲击参数及其调整方法。
Then the horizontal load to aeroplane undercarriage tyre can be obtained more accurately by making use of the proposed model and results of drop-test simultaneously.
根据起落架落震试验结果和该数学模型，可以得到考虑动态效应的起落架机轮水准载荷。
Then the horizontal load to aeroplane undercarriage tyre can be obtained more accurately by making use of the proposed model and results of drop-test simultaneously.
根据起落架落震试验结果和该数学模型，可以得到考虑动态效应的起落架机轮水准载荷。
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