Design and noise reduction of elevated road barrier of micro-perforated panels with linear-change cavity;

Using transfer matrix method to analyze microperforated panel absorber s acoustic characteristic;

The possibility and the significance of replacing fibred absorption materials by fibreless materials,especially by microperforated panels,are discussed.

A calculating program of microperforated panel construction is worked out in this paper.

Based on theory about micro perforated panel,a micro perforated panel muffler was developed to meet the requirement of the pneumatic motor in roofbolter.

In this paper, based on Maa's theory, the theory of micro perforated panel(MPP) absorber is summarized, a comparison between the calculated result and the testing result for intermediate and lower frequency standing wave tubes is made.

On the basis of the general theory of microperforated-panel absorber, numeric analysis program is designed in structural design of microperforated-panel.

Due to the excellent feature of micro-perforated panel structure in noise control,the micro-perforated panel structure has drawn much attention.

In order to solve this problem,the transfer matrix method is adopted to analysis of micro-perforated panel absorber\'s acoustic structure.

Based on the accurate theory of the micro-perforated panel absorber,this paper presents one kind of approximate arithmetic for micro-perforated absorber with variational cavity.