SMT solder joint reliability issues caused by drop impact are received more and more attention in recent years.
针对在跌落碰撞条件下便携式电子产品中SMT连接焊点的可靠性问题,对该领域相关的理论和实验研究成果进行了综述。
By using the Laplace transformation and Simulink, the dynamic characteristics of product under a varies of inputs and drop process are analyzed.
建立了缓冲包装系统的动力学模型，列写了系统在振动、冲击状态下的微分方程，在对微分方程进行拉民变换的基础上，讨论了运用Simulink动态仿真工具来仿真包装件在多种激励下及跌落过程中的动态特性。
The results showed that the damage boundary differs as the orientation changes,and even when the cookies are dropped in the same orientation,the damage rate is not identical.
结果表明,饼干不同方位的破损边界曲线都不相同,且同一方位的跌落下,不同破损率破损边界曲线也不相同。
The design of the dropping tester for simple packages;
简易包装件跌落试验机的设计
The properties of the molded pulp cushion were investigated through the vibration and dropping experiments of the signal acquisition instrument package.
通过对信号采集仪包装件进行振动试验和跌落试验,研究了纸浆模塑缓冲衬垫的抗振和缓冲能力。
Smoothed particle hydrodynamics (SPH) method coupled with finite element method (FEM) is used to simulate the dropping of rectangular fluid-filled tank.
采用SPH和FEM耦合的方法,考虑流固耦合效应的影响,对典型矩形薄壁充液容器的跌落过程进行数值仿真。
A 3-D FE model was established in order to investigate dynamic responses of the round PCB and find the weakness of solder joint in packaging under drop impact.
针对JEDEC标准板的局限性,设计一种圆形PCB,建立其三维有限元模型,运用ABAQUS有限元分析软件对设计板在跌落冲击载荷下的动态特性进行模拟仿真,找到封装中焊点的薄弱环节,得出焊点的应力状况与PCB板的挠曲变形存在一致的对应关系,验证PCB板在跌落冲击过程中弯曲振动导致的交变应力是焊点破坏的原因。
With increase in electronic package density,the reliability of a board-level package under drop impact load becomes a key issue.
随着微电子封装密度的提高,板级封装在跌落冲击载荷下的可靠性成为人们关注的焦点。
Drop direction is an important parameter of drop impact,this paper presented a new method to measure drop direction and introduced the basic structure,measurement circuit and principle of the sensor.
跌落方位是跌落冲击中的一个重要参数,测量较为困难,提出了一种基于电容传感器的跌落方位现场测试新方案,分析了其基本结构、测量电路、测试原理和方法。
Fall out of
从。。。。跌落出来
There may be a drop of two or three dollars.
说不定会跌落两三元。
fell crashing on the pavement;
哗啦啦跌落在人性道上；
The floor collapsed and they fell through.
地板坍了，他们跌落下去。
The dishes fell to the floor.
碟子跌落到地板上。
He that is down need fear no fall.
位居底层者不怕跌落。
A momentary voltage dip that lasts for a few seconds or less is classified as a voltage sag.
短时电压跌落持续几秒或更短可归属电压下跌。
How do the equestrian rules define "fall," anyway?
另外，马术规则对“跌落、跌倒”是如何定义的？
Ancient bodies' fallen heaven, a dark star in a fallen sky.
远古的躯体跌落了的天堂，一颗黯淡的星挂在跌落的天上。
The Relationship Between Angles and Errors at Angle(Edge) Dropping Test of a Packaged Hexahedron and Their Controlling Method
包装六面体角(棱)跌落时各跌落角误差的关系及控制方法
Half Sine Wave Shock-exited Analysis Based on ASQ700 Model;
ASQ700跌落冲击试验机的半正弦波跌落冲击试验模型分析
go down; finish
下降跌落;沉落;沉没;离开学校;受欢迎;被赞许
Packaging--Transport packages--Vertical impact test method by dropping
GB/T4857.5-1992包装运输包装件跌落试验方法
The falling bottle knocked him on the head.
跌落的瓶子砸在他的头上。
I manage to grab hold of the jug before it fall.
我设法抓住了那个罐子才未跌落。
The rope loosened up and he fell to the ground.
绳子松开了，于是他跌落到地上。
He crashed to the ground with a loud BANG!
“碰”的一声巨响，他重重地跌落在地板上。
Suddenly the horse jumped up and tipped its rider off.
马突然跳起，使骑手跌落下来。