单面立式平衡机的不平衡叠加效应的实验研究

用单面立式动平衡机在对不同尺寸、不同质量工件进行动平衡测量时,会发现存在一个与理论值不匹配的额外不平衡量,传统方法难以给出合理的解释,分析表明是其忽略了摆架系统和转子合成质心的变化,即不平衡叠加效应会影响测量的准确性。研究了转子和摆架系统质量偏心引起的质心运动方程,并通过质心位置得到振动中心位置。提出了不平衡叠加效应与额外不平衡量的概念。推导了合成系统的叠加不平衡量公式,分析了转子质量和转子安装高度对此额外不平衡量的影响,根据实验数据进行了误差对比分析,验证了该额外不平衡量与转子质量和转子安装高度的关系,阐明了此额外不平衡量的来源。

Tests for unbalance superposition effect of a single-sided vertical balancing machine

When using the single-sided vertical dynamic balancing machine to measure the unbalance of rotors of different sizes and different masses, it is found that there is an extra unbalance that does not match the theoretical value. The traditional method is difficult to give a reasonable explanation, analysis shows it ignores the variation of the synthesis centroid of the rotor and the swing frame system, the unbalance superposition effect will affect the accuracy of the measurement. The centroid equation of motion caused by the eccentricity of the rotor and the swing frame system was analyzed, and the position of vibration center was obtained. The concept of unbalance superposition effect and extra unbalance is proposed. Superimposed unbalance formula of the synthesis system was deduced. Effect of rotor mass and rotor mounting height on the extra unbalance was analyzed. Comparative error analysis was performed based on the experimental data. The relationship between the additional unbalance and rotor mass and rotor mounting height is verified. The source of the extra unbalance was clarified.