柴油机曲轴前后端相对扭振的测试方法
曹精明1，2，崔宾2，时胜文2,3，徐子春2
1.潍坊内燃机质量检验中心有限公司，山东 潍坊 261012; 2.潍柴动力股份有限公司，山东 潍坊 261061；
3.内燃机可靠性国家重点实验室，山东 潍坊 261061
摘要：为准确分析曲轴扭振数据，提高柴油机曲轴可靠性，以某直列六缸柴油机曲轴为研究对象，建立轴系质量刚度当量模型，搭建柴油机扭振测试系统，采集曲轴前端和飞轮端的转速脉冲信号，分析不同转速下各主要阶次扭振与相对扭振的关系。研究结果表明：曲轴前端3.0阶扭振曲线与相对扭振曲线相差较大，单点扭振无法精确反映曲轴扭振；曲轴的相对扭振可有效消除滚振及外接轴系对扭振的影响，测试曲轴的相对扭振对准确分析曲轴扭转程度至关重要。
关键词：相对扭振;曲轴;转速脉冲
Test method of relative torsion vibration fromfront end to rear end of
crankshaft
CAO Jingming1,2, CUI Bin2, SHI Shengwen2,3, XU Zichun2
1.Weifang Internal Combustion Engine Quality Inspection Center Co., Ltd.，Weifang 261012，China；
2.Weichai Power Co., Ltd.，Weifang 261061，China；3.State Key Laboratory of
Engine Reliability, Weifang 261061，China
Abstract：In order to accurately analyze the torsional
vibration data of crankshaft and improve the reliability of diesel engine
crankshaft, taking an in-line six-cylinder diesel engine crankshaft as the
research object, the shafting mass stiffness equivalent system model is
established, the diesel torsional vibration test system is built, the
rotational speed pulse signals at the front end and flywheel end are collected,
and the relationship between the main order torsional vibration and the
relative torsional vibration at different rotational speeds is analyzed. The
research results show that: the 3.0 order torsional vibration curve of the
front end of the crankshaft is quite different from the relative torsional
vibration curve, and the single-point torsional vibration cannot accurately
reflect the crankshaft torsional vibration; the relative torsional vibration of
the crankshaft can effectively eliminate the rolling vibration and the influence
components of the external shafting torsional vibration. The relative torsional
vibration of the test crankshaft is crucial to accurately analyze the degree of
crankshaft torsion.
Keywords:relative torsion vibration; crankshaft;
speed pulse
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