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本文根据大量的计算示功图及总切力曲线图,归纳出气体压力所产生的扭矩不均匀输出系数K′值和剩余功ΔE_1′的数学关系式,再叠加上由往复惯性力所产生的剩余功值,即得到柴油机的总剩余功值。用数学公式计算法代替目前所用的表格计算法。算得的柴油机总当量惯量Ⅰ。其误差可控制在5％以内,并用统计法提供了活塞、连杆重量的估算式,从而为先期确定柴油机的扭转自振频率,提供了一个简捷并且有一定精度的预估法。
In this paper, according to a large number of calculation diagrams and total shear curve, summed up the gas pressure generated by the torque non-uniform output coefficient K ’value and residual work ΔE_1’ mathematical relationship, and then superimposed by the reciprocating inertial force generated Remaining work value, that is, get the total remaining work value of diesel engine. Use the mathematical formula calculation method instead of the currently used form calculation method. Calculated total equivalent inertia of diesel engine Ⅰ. The error can be controlled within 5%, and the formula of piston and connecting rod weight is provided by statistical method, which provides a simple and accurate prediction method for determining the torsional natural frequency of diesel engine.