某型舰用四冲程柴油机键合图建模与仿真

摘要

Due to the intercoupling of the multi energy domains for a diesel engine thermodynamic system,a bond graph theory based modeling and simulation was proposed and applied to a certain type of four stroke marine diesel engine.The heat-work conversion,heat transfer,mass transfer and other energy interaction in the system were analyzed by a standard method established.The model was built on 20-sim simulation platform and the parameters of the model were calibrated using the BFGS algorithm and experimental data.The calibrated modeling simulation results show good agreement with the main engine performances tested,indicating that the model established is accurate enough to be used in engine performance prediction and optimization.Based on the model simulation on the 20-simMatlab optimization platform,the compression ratio and fuel supply advance angle were optimized to meet the fuel consumption target.This research provides a useful method for diesel engine performance optimization.%针对柴油机热力系统多能域相互耦合的特点,提出了基于键合图理论的某型舰用四冲程柴油机建模与仿真方法,以规范化的形式统一分析了系统中存在的热功转换、热传递和质量迁移等多种能量作用.在20-sim仿真平台上建立了该模型,并利用BFGS算法和试验数据对模型部分参数进行了标定.通过与试验数据进行对比,结果表明:标定后的柴油机模型主要性能参数和试验数据吻合较好,模型具有较高的精度.最后,在模型的基础上以柴油机燃油消耗率为优化目标,利用20-sim-Matlab联合仿真平台对压缩比和供油提前角进行联合寻优,得到了优化方案.所得结论具有一定理论和工程实用价值.