【摘要】 传统的柴油机噪声评价基于样机试验结果,以A声级和辐射声功率为主要指标,未考虑人耳的听音特点.为解决以上问题,在柴油机的建模仿真阶段,利用响度模型进行噪声评价与优化,增加了声学预测的有效性,提高了柴油机振声设计的水平.通过有限元法和自动匹配层(AML)法,得到了某16 V型船用柴油机的外声场声压分布和各部件的声功率贡献量.利用Moore模型分析了主要声场点的响度特性,完成了对油底壳的结构改进.改进后柴油机在分析频域内的特征响度和声功率均明显降低,验证了响度评价和优化方法的可行性.更多还原

【Abstract】 The traditional noise evaluation of diesel engine focuses on the A-weighted sound pressure level and radiated sound power of the experimental data of the prototype,without considering the auditory characteristics of the human ear. To solve the above problem,the method of using loudness models to evaluate and optimize noise in the modeling and simulation stage was proposed,which increases the effectiveness of acoustic prediction and improves the level of vibro-acoustic design. By applying the finite element and automatically matched layer(AML)method on a16 V type marine diesel engine,the sound pressure distribution of the external sound field and the sound power contribution of each part were obtained. The oil sump structure improvement was completed through the loudness feature analysis of sound field points by using the Moore model. The specific loudness and sound power level of the diesel engine declined obviously in the analytical frequency domain,which validates the feasibility of the loudness valuation and optimization process.更多还原