A sound fatigue test device using electric speakers to achieve high sound pressure levels

Abstract

The invention provides a sound fatigue testing apparatus using an electric loudspeaker for realizing high sound pressure level. The testing apparatus includes a sound source, a horn, a circle to square transition section, a testing section, a damping section, a controller and an optical strain measuring device. The sound source, the horn, the circle to square transition section, the testing section and the damping section are successively connected. According to the invention, the apparatus play noise load at any frequency spectrum that is customized by a user without distortion loss, and has one continuous sounding time no less than 30 mins; a sound signal transmitted is disseminated to the testing section after a certain sized circle to square transition section, and arrives at an even sound field environment which has a highest high sound pressure level of 140 dB at a sound field stabilizing area of the testing section; the apparatus, through 4 points mean value feedback control, enables the stabilizing precision of the sound pressure level of the testing section to reach noise testing requirements of GJB150.17A-2009; the apparatus can flexibly change the methods of gripping a testing piece, and realizes wall hanging, hanging, and sound-silence combined loading test; the apparatus increases precision of strain measuring, and is free from limitation of temperature and environment; the apparatus has a total length of not greater than 2.5m, and has a radiation noise smaller than 65dB (A) at 2m of the radius.

Description

technical field [0001] The invention belongs to the field of aeronautical structure strength testing or the field of spacecraft dynamic testing, in particular to a sound fatigue testing device which utilizes an electric speaker to realize high sound pressure level. Background technique [0002] In recent years, research on new aerospace vehicles has gradually emerged, and it has attracted much attention due to its significant advantages such as high maneuverability, long combat distance and short attack time. Its development, production and installation will greatly enhance the country's military defense strength. Due to the high flight speed, the new type of aircraft faces extremely harsh working environment. In the extremely harsh service environment, the material structure of the aircraft is prone to fatigue failure. The most common form of failure is acoustic fatigue. Because the aircraft will interact with the fluid during high-speed flight, forming a turbulent boundar...

Images