Effect of Microwave Treatment on the Sound Absorption Performance of Radiata Pine

[Objective] Using high-intensity microwave to modify the radiata pine, explore the influence of different microwave power, processing time and wood texture direction on the sound absorption performance of radiata pine, so as to improve the added value of wood and expand the application field of wood. [Methods] ] Dry the freshly harvested radiata pine wood to a moisture content of 40% to 60%, and process the radiant pine under different microwave power (100, 120 and 140 kW) and treatment time (20 and 30 s) combined conditions to obtain microwave treatment Material. The transfer function method is used to measure the normal sound absorption coefficient of the microwave-treated timber diameter section and the string section, and to explore the changes in the sound absorption performance of radiata pine under different processing conditions. Observe the anatomical structure and microwave of radiata pine with the help of an optical microscope and a scanning electron microscope. The microstructure morphology before