共查询到17条相似文献,搜索用时 109 毫秒
1.
2.
电流变液发动机悬置动特性分析及控制方法研究 总被引:1,自引:0,他引:1
对电流变液发动机悬置进行力学模型分析,推导复刚度与频率的函数关系式,对悬置的动态特性进行仿真分析.采用PD模糊控制方法对电流变液发动机悬置与车架的二自由度系统进行仿真控制.仿真分析结果说明采用PD模糊控制方法的电流变液发动机悬置的隔振性能较好. 相似文献
3.
4.
建立了液力悬置的力学模型和数学模型,进行了动态特性仿真,分析了液力悬置主要参数对其动态特性的影响。为液力悬置的设计改进提供了不可或缺的基础。 相似文献
5.
《机械制造与自动化》2016,(6):114-117
键合图理论是一种物理系统建模与仿真的有效工具,为了分析电压型逆变器的开路和短路故障特性,提出了逆变器与积分因果关系的阻感负载的键合图模型。首先对键合图的基本原理做了简单的介绍,将调制变压器(MTF)和电阻结合作为开关元件,建立电压型逆变器键合图模型,并分析电路4种故障情况的桥臂a输出电压。然后在此基础上建立在不考虑驱动信号的故障情况,改变负载模型的MTF的模数,可实现逆变电路的故障模拟,最后通过仿真验证,实验结果表明了该键合图建模方法及模型的正确性。 相似文献
6.
7.
8.
9.
分析了圆筒混合机振动产生的原因和激励来源,利用键合图的基本理论,根据圆筒混合机的动力学模型建立了相应的键合图模型,并对键合图模型进行了仿真,动态地展示了在可能激励的情况下产生的响应。并将实测的横向振动数据与仿真结果进行了比较,验证了键合图模型的正确性。 相似文献
10.
王佃武 《机电产品开发与创新》2013,26(4):124-126
介绍了新型智能材料电流变流体(悬浮液型)在液力传输中的应用;运用电磁理论、流体动力学、Bing-ham plastic流体动力模型和静电极化理论,推导出电流变流体控制元件的控制方程,并根据电流变流体控制元件的设计准则,设计了平行平板和同心圆筒型两种电流变流体控制元件;运用现代控制理论和计算机仿真软件(Matlab)对电流变动力元件进行了静态分析,对电流变阀控液压系统进行研究分析。 相似文献
11.
This paper presents feedback control characteristics of a shear-mode type electro-rheological (ER) engine mount. The field-dependent
yield stress of an arabic gum-based ER fluid is obtained using a couette type electroviscometer, and it is incorporated into
the governing equation of motion of the ER engine mount, which is derived from a bond graph model. A sliding mode controller
which directly represents the field-dependent damping force is formulated by taking into account the stiffness and damping
properties of the systems as parameter uncertainties. The controller is then experimentally realized by imposing a semi-active
actuating condition. The effectiveness of the proposed ER engine mount is demonstrated showing capabilities of isolating the
vibrations due to sinusoidal and random excitations. 相似文献
12.
13.
基于四冲程发动机的工作原理 ,用键合图对一四缸汽油机进行了建模。整个模型分为热力学部分和机械部分 ,机械部分的建模采用真键合图 (即功率键合图 ) ,热力学部分采用伪键合图。伪键合图的几种C元件和R元件根据其实际的物理特性并按照真键合图的习惯进行了定义 ,然后推导出整个系统键合图的 13个状态方程式 ,并进行了数值仿真 相似文献
14.
Optimal design of nonlinear hydraulic engine mount 总被引:1,自引:0,他引:1
Young Kong Ahn Jin Dae Song Bo-Suk Yang Kyoung Kwan Ahn Shin Morishita 《Journal of Mechanical Science and Technology》2005,19(3):768-777
This paper shows that the performance of a nonlinear fluid engine mount can be improved by an optimal design process The property
of a hydraulic mount with inertia track and decouplen differs according to the disturbance frequency range. Since the excitation
amplitude is large at low excitation frequency range and is small at high excitation frequency range, mathematical model of
the mount can be divided into two linear models One is a low frequency model and the other is a high frequency model The combination
of the two models is very useful in the analysis of the mount and is used for the first time in the optimization of an engine
mount in this paper Normally, the design of a fluid mount is based on a trial and error approach in industry because there
are many design parameters In this study, a nonlinear mount was optimized to minimize the transmissibilities of the mount
at the notch and the resonance frequencies for low and high-frequency models by a popular optimization technique of sequential
quadratic programming (SQP) supported by MATLAB(r) subroutine. The results show that the performance of the mount can be greatly improved for the low and high frequencies ranges
by the optimization method 相似文献
15.
soT^TloNSi--RatiO of CVT hai1--ha ratio of taluceri2--Final ratiot--TAne(s)v--Vehicle speed(km/h)r--Tire radius(m)n .--Ewine rOtationa vefority(r/ndn)~.--Eedne angUlar velocity(rad/s)cod--Driving axle valocity(rad/s)I.--Inertia Of engine(kg. m2 )I,--Inertia around drive pulley(kg' m2 )Is--Inotia around driven pulley(kg' m2 )Id--Inertia around driving axle(kg' m2)T.--Engine tOrque(N' m)Td--boving torque(N' m)Ml--W torque(N' m)M,--ROlling resiStance toeque(N' m)F.--FOrce of air r… 相似文献
16.
Achieving very restricted noise, vibration and harshness targets in modern vehicles, makes using the hydraulic engine mount crucial. Hydraulic engine mounts have both solid and fluid media in their structures that make their dynamic behavior complex to figure out. We present a three-dimensional model of HEM with using finite element method that encompasses elastomeric material’s nonlinearity and fluid-structure-interaction. Dynamic equivalent modulus of elasticity for elastomeric material is identified through iterative model updating procedure. To do model updating, the results (here, namely, natural frequencies and frequency response function graphs) are compared with real hydraulic engine mount behavior that derived from modal tests. The results showed that the dynamic characteristic of elastomeric material is frequency dependent and can be divided into two distinct regions: below 30 Hz (low frequency) and above 30 Hz (high frequency) with different trends. 相似文献