Design And Finite Element Analysis Of16V170Diesel Engine Crankshaft

Crankshaft is the most important and expensive moving part in the diesel engine, its size dramatically influence or even decide the overall dimensions, quality, costs, reliability and life of the engine. During engine working, periodically varied gas explosion pressure, reciprocating and rotating inertia force of the piston and connecting rod assembly, irregular resistance torque of engine accessories, torque turning vibrations and flexural vibrations all load or force on the crankshaft. So the crankshaft is also a part which is loaded extremely complicated force. Therefore, crankshaft design is the most important work in the project of "16V170Diesel Engine Developing" for Zibo Diesel Engine Parent Corporation.Pro/E three-dimensional design combined with ANSYS finite-element analysis is used to improve the reliability of16V170diesel engine crankshaft design. Main research work in the paper is as following:First, Pro/E software was used to build the three dimension models of piston and connecting rod assembly, and calculate their mass. Thermodynamic and crankshaft dynamic calculation of the16V170diesel engine were completed by calculation program based on Matlab.Second, based on the crankshaft dynamic results and structure dimensions, its fatigue strength was checked according to "Classification Rules of Steel Sea-going Vessel2009" of China Classification Society.Third, simplified crankshaft three-dimensional model was built by Pro/E software. And the ANSYS software was used to make static analysis which could get the stress and deformation status of the crankshaft in one engine cycle. And based on the results of static analysis, static strength, fatigue strength and fatigue life of the crankshaft were calculated.Forth, natural frequencies and corresponding vibration of the crankshaft under free status and constrained status were calculated by modal analyzing to decide whether dynamic property of the crankshaft could meet design requirement.Finally, the influence of the structure dimensions, like main journal diameter, crank journal diameter, main journal fillet radius, crank journal fillet radius and concave round radius, on the strength and rigidity of the crankshaft were analyzed by ANSYS software. Based on the analysis, several optimize methods were proposed. Through the comparison of the influence of each method on the crankshaft fatigue strength and fatigue life, the best optimize method was found.