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Radiated noise from various components is of increasing concern for today's automotive manufacturers. Traditionally, this analysis was usually performed with Boundary Element Method (BEM) software. Unfortunately, there is no sensitivity or optimization capability within any known BEM code. This paper addresses the problem by describing the software developed by CDH, i.e., OPT and VAO, which combine the structural FEM analysis and optimization with BEM analysis such that one can perform analysis and optimization very quickly and efficiently. A sample air cleaner problem is described which illustrates the minimization of radiated noise at a predefined far-field positions.

During the process of basic research on reduction of emission levels in a diesel engine offering high thermal efficiency and excellent fuel consumption performance, full-scale research was started on a two-stroke diesel engine as the optimum choice for such an engine. 1),2) Based on the results of basic testing on the engine itself consisting of output, fuel consumption and exhaust emissions, the next step was to examine its application as an automobile engine. As a result of that study, the target was set on its application in a compact car of the future, and research was begun on its practical application. The developed engine was a two-stroke diesel engine using crankcase compression and loop scavenging, equipped with a semi-DI combustion chamber.