共查询到15条相似文献,搜索用时 156 毫秒
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针对液压式板坯结晶器驱动系统投资高昂、控制复杂、双缸同步性差等问题,提出了由空间非圆齿轮组成的两点连接、同步输出的板坯结晶器非正弦驱动系统。以新型空间非圆齿轮副为变速比传动机构,与偏心轴连杆一起合成结晶器的非正弦振动速度;建立了给定传动比下,波状面齿轮副的节曲线封闭条件和数学模型,并以此为基础,构建出振动波形具有匀速段特征的空间非圆齿轮节曲线;最后通过仿真计算,说明了根据给定非正弦波形设计非正弦驱动系统的流程。与其他形式的非正弦驱动系统相比,该系统不需伺服控制,且同步性能好,成本低,具有推广价值。 相似文献
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结晶器非正弦振动谐波共振 总被引:1,自引:0,他引:1
生产实践中,一些结晶器作非正弦振动的连铸机每次开浇,从起步拉速向工作拉速的升速过程中,在结晶器振动频率远低于振动系统自然频率的情况下,会发生较为剧烈的共振现象,导致钢液液面抖动,严重的还造成漏钢等生产事故。针对此问题,建立振动机构的动力学模型,推导振动激励函数,以椭圆齿轮驱动的非正弦振动为例,对非正弦激励进行谐波分析,给出确定共振区间的方法,分析共振谐波的影响因素。对某钢厂实际振动机构进行谐波共振分析,对该机构的运动状态进行现场测试,测试结果与理论计算结果吻合,揭示了该机构出现强烈横向偏摆的原因,验证了谐波共振。 相似文献
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The prototype of mold oscillator that uses a non-sinusoidal generator was modified using Inverse dynamics and Multi-body dynamics. We maintained a basic structure of the mold oscillator including the motor, the gear, the leaf-spring and the caster. To reduce the coupling effect, the non-sinusoidal generator was replaced by a hollow cylinder that had non-sinusoidal surface. The system parameters were obtained from previous research [1], and a new design of the connecting rod between the cylinder and the leaf spring was analyzed by sensitivity analysis. A definition of the detailed system component including gear mesh, and non-sinusoidal surface, Lagrange's equation, Fourier series, and Cam profile synthesis was used to define an equation of motion. The response of oscillating system was derived by a direct integration method. The model was simulated according a specific assumption for each component, and a control system corresponding to real operation was applied. Dynamic responses are displacement, velocity and acceleration of each component. All responses from these simulations were analyzed in the time-frequency region by Fast Fourier transform. Using the model, sensitivity analysis about design variables was also executed about operating performance. 相似文献
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The investments of the electro-hydraulic servo system of the mold non-sinusoidal oscillator are great, the modification ratio of the mechanical type is unable to be adjusted online, and some continuous casters suffer from server resonance during the casting. A mold non-sinusoidal oscillation mechanism driven by servomotor is proposed and the prototype is produced in the lab, the investment is low and the modification ratio is can be adjusted online, and the stability problem is studied. At first the dynamics model of the servomotor non-sinusoidal oscillation is established, and the kinematics differential function is deduced. Furthermore, based on the harmonic balance method, the eigenvalues of the system are solved; the criterion of the stability of the system is put forward. In addition, the eigenvalues and harmonic with different oscillating parameters are analyzed. Analytical results show that the real parts of the eigenvalues are positive, the system will be unstable, and the resonance will occur when the positive real parts of the eigenvalues are extremum. A foundation is established for solving the running smooth problem and next application of this mechanism. 相似文献
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优化直接进给轴伺服参数对提高进给轴抗干扰性能具有重要作用。分析了数控系统中应用伯德图优化伺服参数存在的问题,研究了一种基于动刚度评价的直接进给轴伺服参数优化方法。通过建立直接进给轴动力学模型,给出了基于脉冲激励的动刚度测量方法,依据测量方法确定进给轴动刚度频谱图,建立了直接进给轴伺服系统动刚度模型,分析得到影响动刚度的主要因素,结合动刚度频谱图,给出了伺服参数快速优化策略。优化策略中依据动刚度频谱图判断共振点所在频段,应用电子滤波器抑制共振频段。以驱动系统为SINUMERIK 840D的自构建直线电机进给轴实验平台为对象,进行了伺服参数优化实验,实验结果表明,该方法能有效避免误判共振频段,可直接确认共振点,与应用伯德图优化伺服参数方法相比,优化后使速度环伯德图0dB频段增加58.6Hz,且首个尖峰延后11.7Hz。 相似文献