Medical diagnostics HS code classification

Engine compartment soundproofing (improving engine compartment noise and Medical diagnostics HS code classificationimproving the driving experience) In the automobile industry, the engine compartment soundproofing of the vehicle is an extremely important issue, which directly affects the user experience and market competitiveness of the vehicle. Noise is an inevitable problem in the process of driving a car, especially when driving on the highway. And for sendingRegarding the noise problem of the engine compartment, vehicle manufacturers are constantly exploring ways to improve the sound insulation performance of the vehicle and improve the driving experience. This article will focus on the engine compartment soundproofing scheme and its related technologies. I. The noise source of the engine compartment will be affected by a variety of noises. Among them, noise mainly comes from the following factors: wind noise, road noise and engine noise. The engine noise ranks first. When driving, the faster the driving speed, the faster the engine speed will be, so the noise will become more and more intense. In addition to the speed, the control of the engine actuator will also produce noise. II. Engine compartment soundproofing scheme. In response to the noise problem of the engine compartment, vehicle manufacturers have proposed a variety of schemes, and different schemes will be selected for different models. At present, the common engine compartment soundproofing schemes are as follows: 1.The soundproofing scheme of the chassis is mainly to reduce the impact of engine noise by reducing the noise of the road surface on the noise in the car. By increasing the thickness of the chassis material, increasing the number and density of soundproofing materials, and increasing the body sealing of the rear edge of the chassis, the contribution of chassis noise to in-car noise can be effectively reduced. Two. The sound insulation scheme of the cooling fan The noise generated by the engine cooling fan is usually greater than the noise generated by the engine itself. Therefore, it is a very effective noise reduction measure to wrap the cooling fan with soundproofing material to reduce the noise when the fan rotates. 3. Engine soundproofing mat Engine soundproofing mat is a method of reducing engine noise transmission. The engine (including the oil sp and the basket chassis) can be isolated from the body to reduce vibration noise by strengthening the sound insulation pad.Four. The engine compartment soundproofing cover is a relatively novel sound insulation technology. By installing the cover around the engine, the engine space is closed and the spread of noise is reduced. Soundproof covers are usually composed of molded hard materials and soundproof materials. However, this method requires the redesign of the space around the engine, which increases the manufacturing cost. III. Engine compartment soundproofing technology 1. Soundproofing materials At present, most of the soundproofing materials are composed of foam, silk, cotton and synthetic materials. These new materials have better sound insulation and vibration resistance than traditional materials. For example, new foam materials can improve acoustic isolation performance, mechanical rigidity and strength through their special structural design. Two. The purpose of vibration control technology vibration control is to restrict the vibration range of the engine and reduce the propagation of engine noise. Control and startThe vibration of the machine can be achieved by adjusting the mass balance of the engine, using flexible brackets or shock absorbers and other methods. 3. Damper damper is a high-tech material with very good sound insulation effect. The main function of the damper is to eliminate the resonance noise and toxic sound of the engine, while fixing these noises in the soundproofing material to avoid its spread into the car. IV. Conclusion Engine compartment noise is an inevitable problem for drivers in the process of driving. Vehicle manufacturers have been constantly researching sound insulation technology to improve the sound insulation performance of the vehicle and improve the driving experience. In response to the noise problem of the engine compartment, vehicle manufacturers have proposed a variety of solutions, including the soundproofing scheme of the chassis, the soundproofing scheme of the cooling fan, the engine soundproofing mat and the engine compartment soundproofing cover, etc. In addition, the continuous innovation of engine compartment soundproofing technology also provides new possibilities for the improvement of sound insulation effect.By adopting new soundproofing materials, vibration control technology and dampers and other means, the noise problem of the engine compartment can be better solved and the quality of the driving experience can be improved.

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