In general, car noise has four “source”: engine noise, tire noise, air noise and body structure caused by noise. 1. Engine noise. In addition to the mechanical sound emitted by the engine body, it also includes the noise of the intake system, that is, the high-speed gas enters the cylinder through the air filter, the intake pipe and the valve, and a strong aerodynamic noise is generated during the flow. Engine noise is mainly transmitted to the cockpit by the fire wall and the front floor of the cab. 2. Tire noise. The general tire noise is mainly composed of three parts: one is the air flow in the tire pattern gap and the air noise caused by the air disturbance around the tire; the second is the tire vibration noise caused by the vibration of the carcass and the pattern part; the third is the road noise caused by the uneven road surface. . 3. Air noise. First, the wind noise is the noise caused by the pressure change caused by the separation of the airflow around the body; the second is the wind leakage, or the sound of the suction, which is the noise generated by the interaction between the cab and the body gap and the airflow around the body; The third is other noise, including cavity resonance. 4. Body structure noise. Mainly affected by two factors, one is the vibration transmission mode of the body structure, and the other is that the metal components on the vehicle body generate noise due to vibration under the action of inside and outside. To deal with these noises, we can use two methods: The first is to fundamentally make the noise disappear or become smaller, to eliminate the noise fundamentally. First of all, let us first understand the noise of the car from where? Targeted to find out the different sources of noise in the car, in order to prescribe the right medicine, cure “noise”, in order to get rid of the disease. For example, if the tire is noisy, you can choose a tire with low tire noise to reduce the noise. This is the fundamental solution to the problem. The second is to do the whole car sound insulation project, which is the method adopted by most people. So we will introduce it, although the noise does not change outside, but it is quiet in the cab. Car noise is generally suitable for cars with lower configuration, more comfortable or lower end. If it is a high-end car, the original sound insulation has been quite good, and then spend money to do sound insulation instead. There are also car friends who question the effect of the car after upgrading the sound insulation. It is believed that the effect of shielding the noise after the car is upgraded and soundproofed is very little or even ineffective, and it also increases the load and fuel consumption of the vehicle. This is mainly the brand of the soundproof product selected by the rider. Due to improper quality. How to choose car sound insulation? Door noise insulation construction operation procedure Step 1: Remove the door liner. Step 2: Silent material installation. Remove the dirty, oily and residual glue inside the door. If it is not cleaned, the damping material is not easy to stick and easy to fall off. Use the pretreatment agent to coat the surface to be pasted before pre-shocking. The third step: stickers vibration damping, sound absorbing materials. Cut the appropriate size of the damping material into the door, and evenly scrape the surface of the damping material with a squeegee to make it fully adhered to the door. Cut the appropriate size of the sound absorbing material and paste it on the vibration absorbing material. as a center. Step 4: Appropriate application of the hose. If the paste affects the movement of the switch handle, install a wiring hose on the door switch handle. Step 5: Stick the anti-sound material. Cut the appropriate size of the anti-sound material onto the inner liner and apply it evenly with a squeegee to adhere it to the inner liner. Do not stick the small holes used in the inner liner. Step 6: Apply sealing material. Applying a sealing material around the speaker and around the mounting plate enhances sound insulation and increases fuel consumption.
July 29, 2019 0 Comments
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