Abstract

Aiming at the noise reduction problem of fixed platform mass production excavators, the application method of acoustic packaging louvers is proposed. Under the premise of economy, louvers' application is an important means of acoustic packaging, which can effectively reduce noise through reasonable design and installation. Based on the applicability of boundary element under pressure boundary conditions, the insertion loss sensitivities are obtained by OFAT method for four parameters of louvers' fin, which are orientation, spacing, coincidence rate and inclination angle. Thereby the impacts of these four parameters on the acoustic packaging performance are quantified. The insertion loss evaluation method based on acoustic power measurement is proposed, which is more reliable than the traditional single-point sound pressure measurement. Sensitivity analysis of insertion loss confirms that there is a critical level of fin spacing, coincidence rate, and inclination angle, and that crossing the critical value can degrade or even weaken the marginal utility of acoustic packaging.