For the four kinds of dynamical systems, i. e., the gasoline vehicle HC tailpipe emission at different transient conditions, the diesel engine block vibration at different compressing ring conditions, the rotor vibration at different rub-impact conditions between rotor-stator, and the front suspension vibration at different automobile suspension conditions, the Shannon entropy was calculated, therefore the capability of Shannon entropy to character the system noise and to identify the system condition was reviewed.
分别对不同瞬态工况的汽油汽车尾气HC排放、不同活塞环状态的柴油机机身振动、转子定子不同碰摩状态的转子振动、汽车前悬架状态变化时的振动这4种动力系统计算Shannon熵，考察其对于系统含噪的表征能力和对于系统状态的辨识能力。
Through simulation of the real process of thomcolumbar burst fracture and use of modem dynamics techniques, the present study was (1) to investigate the kinetic relationship between structural damage and impact energy absorption and dynamics mechanism of thoracolumbar burst fracture by quantitative analysis of various injured segments; (2) to explore the instability mechanism of L1 vertebral burst fracture and its injury threshold by three-dimensional analysis of the injured segment with stereophotogrammetry in combination of transient physical parameters, anatomy and image; (3) to explore the corresponding relationships between impact energy, geometry parameters and biomechanics by geometry and biomechanical analysis of thoracolumbar burst fracture, which may provide an objective standard for evaluation of spinal injury severity and experimental evidence for adoption of biomechanical treatment in clinic; (4) to evaluate the fixation effect of different instruments and the effect of intervertebral bone graft on segment fixation by analysis of the threedimensional stability of different internal fixation instruments and their decompression of the spinal canal, which may provide experimental evidence for therapeutical selection for thoracolumbar burst fracture in future; and finally to investigate the effect of various instrument fixation on dynamical characteristics by comparison and quantitative analysis of frequency and amplitude responses, which may provide certain theories and experimental evidence for application of vibration test to judge the stability of the spine.
本研究从胸腰段脊柱爆裂骨折发生的实际过程出发，以现代动力学检测及计算机多通道高性能数据采集分析系统等高新技术为基础，实时量化分析损伤节段的工程参数，揭示了结构破坏与能量吸收的变化规律，探讨了胸腰段脊柱爆裂骨折的瞬态损伤机制；利用三维立体摄像技术，对不同损伤程度的节段进行三维运动分析，结合瞬态物理参数、影像学和病理解剖，明确了〓椎体爆裂骨折的失稳机制及损伤阈值；通过对胸腰椎爆裂骨折的几何学变化及生物力学分析，明确了撞击能量与几何参数、几何参数与生物力学的相应关系，为评判脊柱损伤程度提供了客观标准，为治疗中采取适宜的生物力学方法提供了实验依据；通过对比分析不同内固定器械的三维稳定性和对椎管的减压作用，评价不同器械的复位固定作用，同时比较椎体间植骨对节段固定作用的影响，为今后临床胸腰段脊柱爆裂骨折的治疗选择提供依据；利用振动测试与分析技术，比较及量化分析了不同致伤状况的频幅响应特征，比较分析了各种器械固定对动力学特性的影响，为今后临床建立基于振动测试与分析技术判断脊柱稳定性的诊断方法，提供了一定的理论和实验依据。
On the basis of the experiment system, experimental studies are achieved, such as transient test, efficiency test, system error test(angle deviation test, repetitive positioning accuracy test, transmission error test), backlash test, electromechanical coupling test, vibration acceleration test, and so on. Electromechanical coupling influence is explored in the permanent magnet AC servo precision drive system, and the theoretical analysis results are compared and validated by the experimental studies.
以实验系统为基础，完成了实验系统的过渡过程测试、效率测试、系统误差测试(转角偏差测试、重复定位精度测试以及传动误差测试)、空回测试、机电耦合实验以及振动加速度测试实验等实验研究，探索永磁交流伺服精密驱动系统的机电耦合影响，并将物理实验研究与理论分析结果进行对比和验证。
This paper confirms that vibration damping character of secondary voltage transient signals and secondary current transient signals of ESP spark discharge can predict and detect the ESP back corona failure efficiently.
确定了ESP发生火花放电时的瞬态信号在时域中的振荡衰减特征能够应用于预诊和诊断ESP反电晕故障； 2。
Vibration and wave; transient response; statistical energy analysis
振动与波；瞬态响应；统计能量法
There is plentiful information in the engine transient waveform, which represents the torsional vibration on engine shaft and individual cylinder's working ability.
柴油机瞬态转速中包含有丰富的信息，体现了柴油机轴上的振动情况和各个气缸的作功能力。
Enforced vibration; Transient response; The direct excitation method; The inertial load method
强迫振动；瞬态响应；直接激励法；惯性载荷法
I dynamic finite element equations considering the geometrical nonlinear piezoelectric smart structures are derived based on Total Lagrange meth under the assumption of weak coupling between electric and mechani Transient response of a plate with piezoelectric actuators subjected transverse dynamic loading is studied. The Numerical result show t piezoelectric actuators can produce significant damping and control transic vibration effectively.
基于Total－ Lagrange方法，通过虚速度增率原理得到可用于压电结构的增量变分原理，建立了压电机敏结构在几何非线性和弱机电耦合条件下动态增量有限元控制方程；单元采用一阶剪切Mindlin板理论，通过引人速度负反馈形成闭环控制系统；分析了板在冲击载荷作用下的瞬态非线性响应；并分析了压电控制元件对非线性动态响应的控制效果。
In the modelling aspect, Boeuf and Garrigues have established the transient state unidimensional quasi-neutrality combination model, has calculated the electron current and ion electric current vibration [1] separately.
在建模方面，Boeuf 和Garrigues建立了瞬态的一维准中性混杂模型，分别计算了电子电流和离子电流的振荡[1]。
Moreover, the analysis results showed that these three factors affected structural dynamic properties in different time scale: the temperature change was accountable for yearly variation of the bridge modal parameters, the acceleration RMS indicating the structural vibration intensity was accountable for their weekly variations and the wind affecting structural modal parameters was in transient strong wind interval.
研究还表明这三个因素在不同的时间尺度上影响结构的动力特性：温度主要体现在年时间尺度上，表征结构振动响应强度的加速度RMS更多的体现在一周的时间尺度上，而风速影响则体现在短暂的强风期间。
According to the short lasting time of the vibration above, the Maximum Transient Vibration Value of the acceleration is selected as the comfort index, which is also the criterion to decide if the differential settlement is tolerable.
由于该振动是持续时间很短的瞬态振动，振动舒适性指标采用人的加速度最大瞬态振动值MTVV，它也为桥头跳车严重与否的衡量标准。
And, the relationship between their natural frequency of vibration and their degree of compaction is measured through the test of transient hammering. Furthermore, the attenuation rule of vibration wave in sand sample and clay soil is gained.
利用瞬态锤击测试，测出新疆风积沙的自振频率及其与压实度的关系，并用此方法测定了振动波在沙样和粘性土中随距离的衰减规律。
The state of being out of gear in vibration test system caused by transient temperature respond of piezoelectric vibration sensor is discussed in this paper. Approach to improve the reliability and stability of vibration test system is available by analyzing the existing fantasticality fault in it.
讨论压电振动传感器的瞬变温度响应引起振动测试系统的失常，分析振动测试中存在的奇异故障现象，并找到了解决的办法，可进一步提高振动测试系统的可靠性和稳定性。
Based on the numerical analysis of transient longitudinal vibration model of an integrate pile, it is found that parameters of soil, pile and impact force have effects on dynamic response of the pile.
基于完整桩瞬态纵向振动模型的数值分析，表明土参数、桩参数和激振力参数都对桩的动力响应发生影响。
In this paper, the change pattern of the cutting vibration signal during the transient processes and the effect of the parameters of band pass filter on the signal transmission are analyzed.
本文分析了切削振动信号在此过渡过程中的变化规律以及带通滤波器对信号传输过程的影响。
Vibration control and earthquake transient dynamic analysis of a structural installation with a shape memory alloy pseudoelasticity damper
基于形状记忆合金超弹性阻尼器的结构振动控制和地震时程分析
From the angle of the mechanics theory, the effect of bending stress and pressure stress on the windings in the multi-span model is analyzed and basic relations of period and frequency between the radial winding vibration displacement and the electromagnetic force in transient analysis process is summed.
从力学理论出发，分析了多跨模型中弯曲应力和压应力对绕组的作用，以及瞬态分析过程中绕组径向振动位移的周期和频率与电磁力周期和频率的基本关系。
The applications of the technology of transient rapping and shock vibration to electrostatic precipitators and bag filters are reviewed.
首先综述了瞬时振打与冲击振动技术在高效除尘设备&电除尘器与布袋除尘器中的应用。
Some problems about the transient vibration of SDOF under simple harmonic load and ground motion was researched. The rule of the transient vibration was generalized.
在已有研究工作的基础下，深入研究了简谐荷载和简谐地面运动作用下单自由度体系的位移反应、加速度反应和内力反应中的伴生自由振动反应情况，总结其中伴生自由振动的运动规律。
Reciprocating compressor; Crankshaft torsional vibration; Model analysis; Transient dynamic analysis;
往复压缩机；曲轴扭转振动；模态分析；瞬态动力分析；