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Translational torsional coupled model based nonlinear dynamic analysis of an NGW planetary gear train 总被引：1，自引：0，他引：1
This paper aims to investigate the nonlinear dynamic behaviors of an NGW planetary gear train with multi-clearances and manufacturing/assembling errors. For this purpose, an analytical translational ? torsional coupled dynamic model is developed considering the effects of time-varying stiffness, gear backlashes and component errors. Based on the proposed model, the nonlinear differential equations of motion are derived and solved iteratively by the Runge-Kutta method. An NGW planetary gear reducer with three planets is taken as an example to analyze the effects of nonlinear factors. The results indicate that the backlashes induce complicated nonlinear dynamic behaviors in the gear train. With the increment of the backlashes, the gear system has experienced periodic responses, quasi-periodic response and chaos responses in sequence. When the planetary gear system is in a chaotic motion state, the vibration amplitude increases sharply, causing severe vibration and noise. The present study provides a fundamental basis for design and parameter optimization of NGW planetary gear trains. 相似文献
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贺达江 《洛阳师范学院学报》2003,22(2):30-32
在普通物理学的力学部分 ,几个常用的定律和定理是 :牛顿定律、动量定理、动量守恒定律、功能原理、机械能守恒定律等 .它们反映了物体运动所遵循的基本规律 ,是解决力学问题的钥匙和原则 .其中最基本的或者最重要的是牛顿第二定律 ,其余各定律或定理都可以通过适当的转换而推导出来 .本文通过对牛顿第二定律的研究 ,找出力学基本规律的内在结构关系及各自成立的条件 ,从而有利于正确灵活使用各定律、定理解决有关物理问题 相似文献
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In this paper,a dynamic model on a rigid rotor-sliding bearing system with a SFD is established.The stability and bifurcation behaviors of the system are studied,on The basis of the differential equations of fluid momentum and mass continuity,the distribution pressure function is derived by taking oil film inertia force into consideration.Damping force, clearance excitation force,interference force of different frequencies and static load are also considered in the model,Finally,the governing equations of the stability and bifurcation behaviors of the system are solved by Floquet theory,Simulation of dynamic model shows that the rigid rotor-sliding bearing system can maintain stability and exhibit a Hopt bifurcation phenomenon in a certain range. 相似文献
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动量定理、动量矩定理、动能定理及相关的守恒律是动力学基本定理，它们的综合应用是求解质点系运动的有效方法，特别是对于两个质点组成的质点系，可以求解每一个质点的运动情况。 相似文献
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动量矩定理是解决动力学问题的基本定理之一,在此主要分析了学生用动量矩定理解题常见错误及错误原因,提醒学生在应用动量矩定理解题时应注意公式的适用条件和范围。 相似文献
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In this paper, the design, construction and ocean testing of a wave energy conversion system are studied. Based on the motion characteristics of double buoys in ocean waves, a wave energy conversion system with permanent magnet tubular linear generator (PMTLG) is proposed to convert ocean wave energy into electricity. The wave energy conversion system was installed in the Yellow Sea near Lianyungang, China. The ocean test results indicate that it had dynamic and static performance, and obtained an expected amount of electricity. The calculation result indicates the average output power was about 1,000,W, and the conversion efficiency from wave energy into electricity was 1.4%,. In addition, the wireless data communication, mechanics and oceanography were also discussed. 相似文献
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木棒和子弹组成系统的动量守恒问题 总被引：1，自引：0，他引：1
王宗昌 《南阳师范学院学报》2005,4(9):36-37
详细分析了子弹射击木棒问题与子弹射击砂箱问题的区别，利用质心运动定理和角动量守恒定律说明了在什么情况下系统的动量才守恒。又引入打击中心的概念，指出了理论的实际应用。 相似文献
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刘永丰 《扬州职业大学学报》2004,8(2):24-29
力偶分为静力偶和动力偶。本将静力偶以等值、反向、平行且相距很近的两个力等效代替，用加权残值法给出了静力偶作用下薄板弯曲的挠度计算；用拉格朗El方程建立了动力偶作用下薄板的运动微分方程，并给出其动力响应。 相似文献
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刚体作平面运动有3个自由度,因此求解刚体平面运动的动力学问题需要3个独立的动力学方程．由于动量定理（含质心运动定理）。动能定理和动量矩定理并不是相互独立的,而且参照系可以是惯性系,也可以是非惯性系,所以刚体平面运动3个独立的动力学方程就有不同的选择方法． 相似文献
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现行大学物理教材存在一些不足,一是角动量定理的表述方式和动量定理、动能定理的表述方式不一致;二是三大运动定理的引入不尽科学;三是确定简谐运动初相的方法不完善;四是对接地导体的带电问题的处理跳跃性太大。文章逐一分析了这些不足,并提出了改进建议。 相似文献
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Mental models are hypothetical constructs for explaining human cognitive processes of understanding external reality, translating the reality into internal representation and utilizing it in problem solving. Three experiments were conducted to investigate important characteristics of mental models, their influence on task performance, and instructional strategies facilitating their formation. The experiments were conducted in computer-based training environments designed to teach troubleshooting electronic logic circuits. The results suggested: (a) dynamic characteristics of mental models are important for solving problems if understanding functional behaviors of the system is required to perform the task; (b) dynamic characteristics of mental models are determined primarily by subjects' understanding of the system features and functions more than by the visually presented training contents of the system; and (c) motion simulating system functions in visual displays is more effective than static visual displays in facilitating the formation of dynamic characteristics of mental models. Consequently, dynamic visual displays are more effective than static visual displays for teaching electronic troubleshooting skills. These findings provide direct implications for the development of training programs. 相似文献
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Nomenclaturex,y,x ·, y·-displacement and velocity of rotor-x,-y,x-·,-y·-displacement and velocity of rotor , di mension less¨x,¨y-acceleration of rotor¨-x,¨-y-acceleration of rotor ,di mensionlessω-rotating speed of rotor-ω-rotating speed of rotor ,di mensionlessx,y,z-Cartesian coordinates-x,-y,-z-Cartesian coordinates ,di mensionless2m-mass of rotorg-acceleration of gravityG-weight of rotor ,di mensionlesse=e2x e2y-mass eccentricity of rotorex,ey-mass eccentricity of rotor in thexan… 相似文献
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周粉妹 《扬州职业大学学报》2003,7(4):40-42
在动态电路中，电路换路后，其初始状态可能发生突变，当一时难以确定时，可用本给出的一种新方法，即换路后电路利用s域模型，再利用初值定理求解动态电路初始值。这种方法适用于各种动态电路。 相似文献
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Dynamic architecture of multi-agent systems (MAS) is important for critical systems. As the existing formal specifications of MAS cannot describe its dynamic architecture, a formal approach using π-calculus is presented, which is suited for the describing and analyzing of concurrent MAS with dynamic topology. π-calculus describes the belief-desireintention (BDI) model that represents agent's mental states and provides many useful facilities to analyze MAS model such as deadlock, behavior equivalence, and model checking. To illustrate the favorable representation capability of π-calculus, an example of dynamic multi-agent systems in e-commerce is provided. Finally, by using an existing π-calculus supporting tool,MAS model and some key behaviors properties are analyzed and verified. 相似文献
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锚泊辅助动力定位是结合了锚泊定位系统和动力定位系统的一种新型位置控制系统。锚泊辅助动力定位系统是最节能且最稳定的定位系统,在国际海洋工程领域具有广阔的应用前景。本文着眼于目前国际上对于锚泊辅助动力定位系统的研究状况,分别从理论计算和模型试验两个角度对其研究进展进行阐述,同时介绍了我国在此领域的研究进展,进一步提出了对于强化相关研究工作的建议。 相似文献
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陈立群 《商丘师范学院学报》2000,16(2):1-4
应用动能定理建立了常速率运动航天器的数学模型并求出两组稳态解.首先将动能定理推广到受非线性非完整约束系统.对于受速率为常数约束的运动质点,可以应用动能定理建立其运动微分方程.最后得到该方程的两组特解. 相似文献