fore-and-aft vibration是什么意思

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用法例句

Study of longitudinal vibration model of mine lifting container;

矿井提升容器纵向振动模型研究

Experimental study on longitudinal vibration characteristics of pendulum assembly in straight hole;

直井眼钟摆钻具纵向振动特性的实验研究

ANSYS-based finite element analysis method of longitudinal vibration of drilling string and its application;

基于ANSYS的钻柱纵向振动有限元分析及应用

In this paper,one-dimensional vertical vibration model of deep well drilling string is estabilished.

以深井中的整体钻柱为研究对象 ,建立了深井钻柱一维纵向振动分析模型 ,采用动力有限元理论建立了描述钻柱振动的动力学方程 ,并且编制了一套钻柱纵向振动分析软件 ,最后使用该软件对深井实用的钻具组合针对不同的工况进行了分析计算。

The partial differential equation analyzing the nonlinear vertical vibration of the pile was first derived.

假设嵌岩桩桩身材料满足非线性弹性和线性粘弹性本构关系,桩周土为有阻尼非线性弹性土体,从而导出了分析基桩非线性纵向振动的偏微分方程;用Galerkin方法对方程进行简化,对简化后的系统进行了数值模拟计算,得到了一种典型参数情形时基桩运动的时程曲线、相平面图、功率谱图、Poincare截面图及分叉混沌图,考察了各种材料及结构参数对基桩非线性纵向振动的影响。

Based on vertical vibration theory,assuming the segment above the defect is a rigid body,and the segment with the defect is a linear spring,an analysis method for the location and level of shallow defect is given.

本文采用振动理论,将浅部缺陷以上桩段假设为刚体,缺陷处的桩身假设为弹簧,通过对浅部缺陷桩的纵向振动分析,提出了一种利用频谱分析技术分析浅部缺陷位置和程度的方法,检测实例验证了该方法的正确性。

Analysis of the influence of drilling fluid on axial vibration of drill string;

钻井液对钻柱纵向振动影响分析

This paper presented the principle and method of calculation for the axial vibration based on Rayleigh differential method of crankshaft for a high speed diesel engine.

采用瑞利法对高速内燃机曲轴纵向振动进行研究。

The reliability mode and the safety probability of the random axial vibration systems of rods are defined as a series mode, a.

根据随机连续杆纵向振动系统的固有频率与激振频率差的绝对值不超过规定值的关系准则,定义了随机连续杆纵向振动系统的可靠性模式和系统的可靠度,提出了避免共振的频率可靠性分析方法,对随机连续系统共振问题的准失效分析方法进行了探索。

With the effect of damping and longitudinal resonance concerned, an analyzing method for the dynamic stability of columnar structures is discussed and formulas for instability zone are derived.

本文推导了有阻尼与发生纵向共振时柱状结构的动力稳定计算公式。

An analyzing method to study the effect of damping and longitudinal resonance on the dynamic stability of columnar structures is discussed and formulas for investigate its instability zone are derived.

推导了有阻尼与发生纵向共振时柱状结构的动力稳定计算公式 ,计算了水中平台动力失稳区间 ,探讨了阻尼与纵向共振的影响 ,得出了一些有应用价值的结

The effects of the damp of strueture and longitudinal resonance have been considered at the same time.

研究了弹性结构动力稳定问题，考虑了结构阻尼及纵向共振时的影响，得出了一些有益规律，这在以往都是无人问津的。

Two kinds of longitudinal oscillation were observed in HLS storage ring.

５ＭＨｚ的两种纵向振荡，它们分别由高频腔的ＴＭ０１２和ＴＭ０３２高次模的阻抗引起。

The first records the arrival of longitudinal vibrations.

首先记录到的是纵向振动。

THE NATURAL CHARACTER ANALYSIS OF CANNON LONGITUDINAL VIBRATION

加农炮身管纵向振动的固有特征分析

The study on longitudinal vibration regulation of bolt in anchorage quality

锚杆在锚固状态下纵向振动规律研究

Longitudinal Vibration Theory of Pile in Sophisticated Soils and Its Application;

复杂土中桩的纵向振动理论及其应用

Vertical Vibration of Floating Pile in Saturated Viscoelastic Soil

饱和粘弹性土层中悬浮桩的纵向振动

Flexural vibration of a compound bar piezoelectric transducer

复合棒压电纵向振动换能器中的弯曲振动

Test and Analysis of a Dynamic Contact Process of Ultrasonic Feeding

超声振动输送的物料纵向振动过程测试与分析

VERTICAL VIBRATION OF PILE IN RADIALLY INHOMOGENEOUS SOIL LAYERS

任意圈层径向非均质土中桩的纵向振动特性

The longitudinal vibration of shaft-line is very important in research of the sound radiated from the hull induced by propeller and shaft-line.

轴系的纵向振动在螺旋桨轴系激励艇体纵向振动声辐射问题分析中具有重要地位。

Solution to Natural Frequency of Longitudinal Vibration for a Nonuniform Nonhomogeneous Bar with Variable Cross Section by Finite Segments Method

有限段法解非均质变截面杆纵向振动固有频率

Wheelset Longitudinal Vibration Analysis and the Correlation Dynamic Performance Investigation;

轮对纵向振动及其相关动力学影响研究

Longitudinal Vibration Theory of Pile in Layered Soils and Its Application in PIT;

成层土中桩纵向振动理论及其在PIT中的应用

The Research of the Longitudinal Vibration in Cone Bits-rock System;

牙轮钻头与岩石互作用下系统纵向振动研究

Evaluation and Forecast of Lengthwise Vibration Fatigue Intensity of Deep Well Drillstring;

深井钻柱纵向振动疲劳强度评估与预测

The Development and Design of Vertical Vibration Measurement Based on Nios Ⅱ;

基于Nios Ⅱ的纵向振动测试仪的开发与设计

Simulate Calculation on Pile Longitudinal Vibration and Quantitative Analysis of It;

基桩纵向振动的模拟计算及完整性定量分析

THEORETICAL CALCULATION AND ANSYS ANALYSIS OF LONGITUDINAL VIBRATION FOR THE DRILLING STRING OF AN EXTENDED REACH WELL

大位移井钻柱纵向振动理论计算与ANSYS分析

longitudinal length extension vibration mode

纵向长度伸缩振动模式