With the increase of cars in China, there are more and more problems with cars. Noise in cars is an annoying thing. Noise is not only upsetting, but also seriously harmful to health. It is believed that all owners are Know well. Car soundproof material important _ how to choose car sound insulation material Car noise products originated from the United States in the late 1980s, a group of car audio enthusiasts, in order to better enjoy the fun brought about by car audio, these products can not only reduce the noise during driving, but also Can promote car audio and sound. After ten years of development, many owners have had a deeper familiarity with car noise protection projects. However, in the process of selecting car insulation brands, there is still a large degree of blindness. For owners who have little understanding of acoustic technology, choosing a reliable car noise insulation product is not easy. As a brand-new automotive aftermarket project, many Professional car audio conversion shop has started to carry out this service, but because the level of participation in the market is different, the effect is naturally different, if consumers do not grasp some basic identification techniques, I am afraid that the front of the "trap". Just as the current automotive aftermarket, the same material used for automotive acoustics, is collectively referred to as "vehicle soundproofing material". It is debatable. The main vehicle noise is structural noise, consensus noise and airborne noise; the main means of transmission are door and chassis (firewalls). , trunk, fenders, roof and other five major parts. To effectively reduce car noise, it is necessary to understand the acoustic properties of the used acoustic product and its construction site on the car. In general, we classify automotive acoustic materials into damping materials, automotive insulation, sealing materials, sound-absorbing materials, and thermal insulation materials. As we all know, the car's shell is a metal structure, and the vibration of the engine and tires causes the metal plate shell to vibrate violently and radiate strong noise. The vibration of the metal structure of the automobile often contains a series of resonant bees. The noise also has the same frequency spectrum as the structural vibration, ie, the noise spectrum also has a series of peaks. Each peak frequency corresponds to a structural resonant frequency. The noise caused by the structural vibration is called structural noise. Experts of the car audio modification shop said that it can be said that the most important noise of the car comes from structural noise, and the most effective method for car structure noise is damping vibration. Applying a layer of damping method to the metal structure vibrates the concrete structure. Reduce the noise radiation, which is what we call damping material. The main role of vibration damping material in vibration damping is: (1) Decrease the vibration energy transmitted along the structure; (2) weaken the vibration around the resonance frequency; (3) Reduce the free vibration of the structure or the vibration caused by the impact. Turn head imitation bird Feather bird small animal bird custom made bird living room decoration decoration garden.Decoration bird cage feather garden model simulation bird bird decoration photography color sparrow ornament bird creativity.Simulation feather magpie field garden ornaments teaching demonstration props home decoration magpie ornaments magpie bird.Simulation white elm finches, pigeons, white birds, bird feather, foam bird, home furnishing, plant micro landscape accessories. Decorative Pendant,Vintage Bird Decoration,Butterfly Origami Decoration,Butterfly Wall Decoration Diy Xintong Craft Gift Co.,LTD , https://www.ychcraft.com
How to choose car noise insulation