搜索结果: 31-45 共查到“工学 vibration”相关记录107条 . 查询时间(0.058 秒)
Vibration of quadrilateral embedded multilayered graphene sheets based on nonlocal continuum models using the Galerkin method
Small scale Free vibration Quadrilateral multilayered graphene sheet Polymer matrix Nonlocal elasticity theory
2012/2/28
Free vibration analysis of quadrilateral multilayered graphene sheets (MLGS) embedded in polymer matrix is carried out employing nonlocal continuum mechanics.The principle of virtual work is employed ...
New Method to Measure the Fill Level of the Ball Mill: Part II—Analysis of the Vibration Signals
ball mill fill level vibration signal signal processing
2011/8/4
The exact measurement of the fill level is the key and basic problem for automatic control and optimized operation of the coal pulverizing system. Because the ball mill pulverizing system is non-linea...
Application of artificial neural network and wavelet transform for vibration analysis of combined faults of unbalances and shaft bow
Rotor test rig Rotor faults vibration analysis, unbalance
2010/9/26
The vibration analysis of rotating machinery can give an indication of the condition of potential faults such as unbalance, bent shaft, shaft crack, bearing clearance, rotor rub, misalignment, loosene...
Finite element study of correlation between intracranial pressure and external vibration responses of human head
intracranial pressure (ICP) finite element model
2010/9/26
In this paper, the correlation between intracranial pressure (ICP) and external vibration responses of the head was studied using finite element modeling. A two-dimensional finite element model of the...
2D阀控电液激振器低频段振动波形分析（Low Frequency Excited Waveforms Analysis of an Electro-hydraulic Vibration Exciter Using a 2D Valve）
控制阀 电液激振器 低频段 振动波形
2010/12/29
2D阀控电液激振器是利用2D阀阀芯的匀速旋转和轴向滑动改变阀口面积变化波形，以产生频率和幅值可独立调节的振动波形。在分析该激振器工作原理的基础上，建立数学模型，采用分段积分的方法，推导出激振器输出波形方程的解析解，最后，将实验得到的波形与解析波形进行对比，根据频谱特性分析波形的失真度。研究结果表明：在低频段，由于主要受到弹性负载力方向变化的影响，振动波形表现出上升与下降过程的不对称，其不对称度取决...
单质体非线性锐共振机械变结构同步控制（Variable Structure Synchronization Control for the Single-mass Nonlinear Sharp Resonance Vibration Machine）
非线性 锐共振 变结构 同步控制
2010/12/29
基于双电动机驱动单质体非线性振动机械的动力学模型，推导出双激振电动机的相位差状态空间方程，在系统锐共振(频率比为0.95~1.05)条件下，建立非线性系统的变结构同步控制器，并对同步控制器参数的选取进行了理论推导。仿真结果表明，双激振电动机的变结构控制同步策略比目前广泛应用的传统PID同步控制策略，能更有效地控制由电动机参数差异、外扰等因素引起的同步性误差，改善多电动机同步性能以及非线性系统的振动...
基于柴油机局部时段振动加速度的缸内燃烧状况（Combustion Estimation Based on Vibration Acceleration Signal from Start of Combustion to Peak Pressure Appearance Timing）
柴油机 缸内燃烧状况 振动加速度 特征参数
2010/12/29
柴油机燃烧峰值压力出现前燃烧过程对应的局部振动信号与缸内燃烧状况密切相关。对比分析了195型及495T型柴油机在该局部时段内振动加速度、缸内压力及其各阶导数的时域波形，基于波形间的相关性，提出了利用振动加速度信号的拐点推测燃烧过程特征点的方法。对比不同工况时局部时段内的缸内压力、压升率、振动加速度及压力升高加速度的时域波形及频谱能量，发现振动加速度信号最大时域波动量及特定频带的能量与缸内燃烧状况密...
原地放垡振动间隔松土对羊草草地质量的影响（Effect of Situ-vibration Spacing Scarifying Technique to Leymus chinensis Grassland）
原地振动间隔松土 羊草草地 植被特性
2010/12/28
以河北坝上地区羊草草地为研究对象，采用野外取样与实验室分析相结合的方法研究了原地放垡振动间隔松土对羊草草地的影响。结果表明，羊草草地经过原地放垡振动间隔松土处理后，土壤容积密度降低、毛管持水力升高和土壤含水率增加，同时土壤养分也呈现不同程度的优化；植物高度、盖度、密度和地上、地下生产力提高，优良牧草所占的比例有所增加，草地群落的植物多样性得到提高；在草地处理3年内平均每公顷每年增加收入155元。
Temperature-independent vibration sensor with a fiber bragg grating.
vibration sensor fiber Bragg grating cantilever beam temperature-independent measurement
2013/5/27
A novel temperature-independent vibration sensor based on a fiber Bragg grating (FBG) is demonstrated. The FBG was glued in a slanted direction onto the lateral side of a right-angled triangle cantile...
Separate Control of High Frequency Electro-hydraulic Vibration Exciter
control valves electro-hydraulic system vibration exciter
2011/8/3
The working frequency of the conventional electro-hydraulic vibration exciters, which consist of a servo valve and a hydraulic cylinder, is generally restricted within a narrow range due to limited fr...
Vibration Control of a Composite Beam Using Self-sensing Semi-active Approach
piezoelectric elements synchronized switch damping semi-active control
2011/8/3
Structural vibration control was an active research area for the past twenty years because of their potential applications in aerospace structures, civil structures, naval structures, etc. Semi-active...
Modal identification of Shanghai World Financial Center both from free and ambient vibration response
Field tests Modal identifi cation High-rise building Random decrement Hilbert–Huang transform
2014/4/10
The Shanghai World Financial Center (SWFC), a currently built super high-rise building, is located in Lujiazui area. The height of this 101-storey building is 492 m above ground. A set of dynamic @...
An Active-damping-compensated Magnetorheological Elastomer Adaptive Tuned Vibration Absorber
adaptive tuned vibration absorber magnetorheological elastomer active damping compensated velocity feedback vibration attenuation performance
2015/3/30
This article presents the development of an active-damping-compensated magnetorheological elastomer (MRE) adaptive tuned vibration absorber (ATVA). The principle and the vibration attenuation performa...
考虑粘滑摩擦的时变振动系统模态参数辨识（Modal Parameter Identification of Time Varying Vibration Systems Subjected to Stick-slip Friction）
时变系统 模态参数 时变多变量Prony法
2010/1/28
将摩擦因素引入时变振动系统的模态辨识中。采用时变多变量Prony法，对振动系统的多输出响应信号建立时变多变量Prony模型，并利用递推最小二乘法估计模型参数，提取出振动系统的模态特征信息。数值仿真中，对含复合频率信号的频率进行了辨识，辨识值与理论值较好的吻合性验证了该方法的有效性。应用实例中，对平面两杆操作臂中的滑动质量块建立了考虑LuGre摩擦的运动方程，利用时变多变量Prony法辨识出含粘滑摩...
Vibration Analysis of Plates With Spot Welded Stiffeners
Stiffened Plates Spot Welding Residual Stresses
2010/1/15
In this work both theoretical and experimental investigation was carried out to study the effect of residual stresses on the vibrational characteristics of plates with spot welded stiffeners at differ...
