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| Multi-Objective Optimization Design of Piston Pinhole Profile of A Diesel Engine |
| DOI：10.13949/j.cnki.nrjgc.2023.04.010 |
| Key Words:piston pinhole profile design surrogate model multi-objective optimization |
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| Abstract:With the development of diesel engines towards high power density， the bearing capacity of piston pinhole needs higher requirements. A multi-objective optimization design for piston pinhole profile was proposed. Firstly， the thermo-mechanical coupling simulation model of 1/4 piston connecting rod group was established and the bearing characteristics of piston pinhole were analyzed. And then the validity of the simulation model was verified by comparing the pinhole contact pressure distribution of simulation model with the pinhole wear under the bench test. Subsequently， the parametric model of pinhole profile was established and the pinhole profile parameters were selected as design variables. The pinhole peak contact pressure， the pinhole maximum Mises stress， the inner chamber maximum Mises stress， and the combustion chamber lip maximum Mises stress were set as the optimization objectives. The optimized Latin hypercube sampling method was used on uniformly sampling in the design space and the Kriging surrogate model was established with the response target value. And then the decision coefficient was used to verify the accuracy of the surrogate model. Finally， the optimal design parameters of pinhole profile were obtained， by tacking the elitist non-dominated sorting genetic algorithm （NSGA-Ⅱ） to optimize the pinhole profile. The optimization results show that the pinhole peak contact pressure was reduced by 24.5%， under the condition that the stress of other important parts of the piston was kept small. |
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