查询词典 impact force

In the simulation of the impact of outrunner blocks in debris flow and counter structures, the structure is simplified as a still plane and the block is simulated by a particle with a certain velocity. So the impact force can be expressed by a simple function.

为模拟泥石流大块石对构筑物的冲击，将构筑物假设成静止不动的平面，将大块石简化为以某速度运动的质点，建立基于修正Hertz接触理论的计算模型。

Aiming at bottom roof caving and support impact problems induced with abrupt large scale caving upper roof in face 21303 of Daliuta mine, this paper put forward the motion parameter at roof caving and calculation formula of roof shear breaking force with the help of theorem of momentum, theorem of moment of momentum and D' Alembert principle. Roof caving process was simulated by Ansys Ls-DYNA program, and maxim impact force was got. The theoretical research outcomes in the paper were applied in face 21303 of Daliuta mine, and were accordant with actual observing status of roof caving process.

针对神东煤炭公司大柳塔煤矿活井21303综采工作面，上层采空区顶板突然大规模垮落对下层顶板及支架的突然冲击问题，文章采用动量定理、动量矩定理、达朗伯原理推出了顶板垮落瞬间的运动量及顶板切顶垮落所需要的剪力值计算公式，用ANSYS LS-DYNA程序对顶板垮落过程进行了数值计算，得到了最大冲击力，在大柳塔煤矿活井21303综采工作面对顶板垮落特征进行了实际观测和理论成果验证。

In this research, we try to find a more practical formula for calculating the impact force of boulders. We infer an academic formula from the elastic collision theory. Then, in the experiments, we simulate the impact by debris flow with mixed diameters in order to correct the result formula. We hope we can provide a reference for future slit dam design and debris flow prevention.

本研究目的为利用弹性体碰撞理论，推求出巨砾冲击力之理论式为基础，藉由实验方式，以混合粒径模拟土石流撞击梳子坝，来修正推算出之冲击力理论式，求得一个更符合实际撞击情形之巨砾冲击力计算式，期能对尔后梳子坝设计及土石流灾害防治问题，提供一设计之参考。

For the sake of accurately estimating the contact force, we describe a new method, in which the contact force is considered as a jump function of time, and by use of response to jump function, the history of impact force is detected in the duration of rotor contacting with stator.

为更准确地获得接触作用力，本文将接触过程中转子所受作用反力函数视为在微小时间间隔下的阶跃函数，提出一种计算接触作用力的新模型，利用系统对阶跃函数的响应可以得到转子与定子碰摩时的切向摩擦力与法相作用力的时间历程及相应的位移、速度量。

The relation between Lagrange multiplier of impact and impact force was obtained on the basis of theorem of motion of mass center.

在子结构离散的柔性多体系统的动力学基础上，由质点系统的质心运动定理建立了与接触碰撞有关约束的Lagrange乘子和撞击力的关系。

Based on the modified Hertz contact theory and the simplified simulation of impact a new method is approved to calculate the impact force of outrunner blocks in debris flow on structures. Based on a limited parametric study, it is shown that the impact causes plastic deformation on concrete structures at a low velocity.

计算结果表明，泥石流大块石在很小的冲击速度（小于1m/s）下就可能导致混凝土材料冲击接触面上产生塑性变形。

The working principles of three kinds of pneumatic clamping device with impact force and of self-locking force amplifier are introduced.

重点介绍了作者创新的三种结合冲击力及自锁机构的高倍增力的气动夹具。

This paper discusses the wonting principle ot the vaive-type counter-actmg nyaraunc impact too1s , and presents methods for calculating impact force and impact frequency.

本文论述了阀式反作用液动冲击器的工作原理，提出了计算冲击力和冲击频率的方法。

Using non-dimensional calculation, influence of parameter on impact force was analyzed combined with state space method. Then, impact forces generated by common pile hammer and PHFMP were compared.

结合状态空间法，采用量纲一化计算方法分析了各参数对锤击力的影响，并对金属颗粒填充桩锤与普通桩锤产生的锤击力进行了比较。

On the above basis,through contrast home with abroad about computation stipulation of impact load between ships and tail gate, which confine size and arientation of impact force in this paper.

在此基础上通过对比国内、外关于船舶与船闸撞击力的计算规定，确定采用撞击力的大小和方向。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。