【摘要】 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。更多还原

【Abstract】 In production practice,some continuous casters,for which the molds undergo non-sinusoidal oscillation,suffer from severe resonance during their starting although the running frequency is much lower than the natural frequency of the os-cillation system.The resonance can cause mold level fluctua-tion and even breakout.To get an insight view of this problem,the dynamic model of the oscillation mechanism is built up.The vibration excitation is deduced.Harmonic analysis is ap-plied on non-sinusoidal excitation.The method to determine resonance interval is given.Factors concern the harmonic components are analyzed.Harmonic resonance analysis is car-ried on a practical oscillation system adopted by a certain iron plant.Also,a test to check the motion states of the mold is done.The test data support the theoretical results very well,which explains why the mold reciprocation table vibrates heavily in lateral direction.And harmonic resonance is verified.Harmonic resonance has general sense in non-sinusoidal oscillation of the mold.So harmonic resonance should be analyzed if only the mold undergoes non-sinusoidal oscillation.更多还原