许春晓，徐传燕*，陈美宏，李光胜
山东交通学院 汽车工程学院，山东 济南 250357
摘要：为了评定某型号船用柴油机的振动水平和振动烈度，结合我国船舶行业中船用柴油机振动评级和评价标准，以某船用柴油发动机缸体为研究对象，基于振动测试试验分析发动机振动水平，评定其振动烈度级，研究不同工况下台架振动烈度；通过测试确定柴油机振动烈度等级和频率分布特性，分析柴油机缸体振动随转速、负荷的变化规律。试验结果表明：振动加速度随转速的升高而增大，最大振动加速度出现在发动机空载工况、转速为700 r/min时的缸体左前中测点；缸体在679~934 Hz存在宽频固有频率，振动烈度级为11级。该研究可为柴油机减振优化提供参考。
关键词：柴油机；振动评级；振动加速度；振动烈度
Abstract：In order to evaluate the vibration level and vibration intensity of a certain type of marine diesel engine, combining with the vibration rating and evaluation standards of marine diesel engines in China′s shipbuilding industry, the cylinder block of a marine diesel engine is taken as the research object. Based on the vibration test, the engine vibration level is analyzed, the vibration intensity level is evaluated, and the vibration intensity of the underframe under different working conditions is studied. The vibration intensity level and frequency distribution characteristics of the diesel engine are evaluated through testing, and the variation law of the vibration of the diesel engine cylinder with the speed and load is analyzed. The test results show that the vibration acceleration increases with the increasing rotational speed, and the maximum vibration acceleration occurs at the left front middle measurement point of the cylinder block under noload working condition and the rotational speed of 700 r/min. The cylinder block has a wideband natural frequency at 679~934 Hz, and the vibration intensity level is 11. This study can provide a reference for the optimization of vibration reduction of diesel engine.
Keywords:diesel engine; vibration rating; vibration acceleration; vibration intensity
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