Why does the national small video certification always fail? Please god, thank you! !

1, the vehicle engine is a noise source, and its noise generation varies with the engine speed.

Solution: You can add some advanced sound-absorbing foam materials to the range hood, which can not only restrain the vibration brought by the range hood, but also absorb a lot of noise, and the effect is obvious.

2. When there is a leak in the intake and exhaust pipe, when the engine is started, gas will leak from the leak during the intake and exhaust process, resulting in vibration and noise.

Solution: In the face of such a situation, it is necessary to check the intake and exhaust pipes, and replacing the intake and exhaust pipes can avoid noise.

3. Tire noise is caused by the friction between the tire and the road surface when the vehicle is driving at high speed. Tire noise is determined according to road conditions. The worse the road conditions, the louder the tire noise. In addition, there are great differences between asphalt pavement and concrete pavement.

Solution: Tire noise belongs to structural noise, which mainly produces vibration. The most reasonable solution is to suppress vibration. Adding damping plates and sound absorption pads can solve the road noise and tire noise well. 1, the vehicle engine is a noise source, and its noise generation varies with the engine speed.

Solution: You can add some advanced sound-absorbing foam materials to the range hood, which can not only restrain the vibration brought by the range hood, but also absorb a lot of noise, and the effect is obvious.

2. When there is a leak in the intake and exhaust pipe, when the engine is started, gas will leak from the leak during the intake and exhaust process, resulting in vibration and noise.

Solution: In the face of such a situation, it is necessary to check the intake and exhaust pipes, and replacing the intake and exhaust pipes can avoid noise.

3. Tire noise is caused by the friction between the tire and the road surface when the vehicle is driving at high speed. Tire noise is determined according to road conditions. The worse the road conditions, the louder the tire noise. In addition, there are great differences between asphalt pavement and concrete pavement.

Solution: Tire noise belongs to structural noise, which mainly produces vibration. The most reasonable solution is to suppress vibration. Adding damping plates and sound absorption pads can solve the road noise and tire noise well. 1, the vehicle engine is a noise source, and its noise generation varies with the engine speed.

Solution: You can add some advanced sound-absorbing foam materials to the range hood, which can not only restrain the vibration brought by the range hood, but also absorb a lot of noise, and the effect is obvious.

2. When there is a leak in the intake and exhaust pipe, when the engine is started, gas will leak from the leak during the intake and exhaust process, resulting in vibration and noise.

Solution: In the face of such a situation, it is necessary to check the intake and exhaust pipes, and replacing the intake and exhaust pipes can avoid noise.

3. Tire noise is caused by the friction between the tire and the road surface when the vehicle is driving at high speed. Tire noise is determined according to road conditions. The worse the road conditions, the louder the tire noise. In addition, there are great differences between asphalt pavement and concrete pavement.

Solution: Tire noise belongs to structural noise, which mainly produces vibration. The most reasonable solution is to suppress vibration. Adding damping plates and sound absorption pads can solve the road noise and tire noise well. 1, the vehicle engine is a noise source, and its noise generation varies with the engine speed.

Solution: You can add some advanced sound-absorbing foam materials to the range hood, which can not only restrain the vibration brought by the range hood, but also absorb a lot of noise, and the effect is obvious.

2. When there is a leak in the intake and exhaust pipe, when the engine is started, gas will leak from the leak during the intake and exhaust process, resulting in vibration and noise.

Solution: In the face of such a situation, it is necessary to check the intake and exhaust pipes, and replacing the intake and exhaust pipes can avoid noise.

3. Tire noise is caused by the friction between the tire and the road surface when the vehicle is driving at high speed. Tire noise is determined according to road conditions. The worse the road conditions, the louder the tire noise. In addition, there are great differences between asphalt pavement and concrete pavement.

Solution: Tire noise belongs to structural noise, which mainly produces vibration. The most reasonable solution is to suppress vibration. Adding damping plates and sound absorption pads can solve the road noise and tire noise well. 1, the vehicle engine is a noise source, and its noise generation varies with the engine speed.

Solution: You can add some advanced sound-absorbing foam materials to the range hood, which can not only restrain the vibration brought by the range hood, but also absorb a lot of noise, and the effect is obvious.

2. When there is a leak in the intake and exhaust pipe, when the engine is started, gas will leak from the leak during the intake and exhaust process, resulting in vibration and noise.

Solution: In the face of such a situation, it is necessary to check the intake and exhaust pipes, and replacing the intake and exhaust pipes can avoid noise.

3. Tire noise is caused by the friction between the tire and the road surface when the vehicle is driving at high speed. Tire noise is determined according to road conditions. The worse the road conditions, the louder the tire noise. In addition, there are great differences between asphalt pavement and concrete pavement.

Solution: Tire noise belongs to structural noise, which mainly produces vibration. The most reasonable solution is to suppress vibration. Adding damping plates and sound absorption pads can solve the road noise and tire noise well. 1, the vehicle engine is a noise source, and its noise generation varies with the engine speed.

Solution: You can add some advanced sound-absorbing foam materials to the range hood, which can not only restrain the vibration brought by the range hood, but also absorb a lot of noise, and the effect is obvious.

2. When there is a leak in the intake and exhaust pipe, when the engine is started, gas will leak from the leak during the intake and exhaust process, resulting in vibration and noise.

Solution: In the face of such a situation, it is necessary to check the intake and exhaust pipes, and replacing the intake and exhaust pipes can avoid noise.

3. Tire noise is caused by the friction between the tire and the road surface when the vehicle is driving at high speed. Tire noise is determined according to road conditions. The worse the road conditions, the louder the tire noise. In addition, there are great differences between asphalt pavement and concrete pavement.

Solution: Tire noise belongs to structural noise, which mainly produces vibration. The most reasonable solution is to suppress vibration. Adding damping plates and sound absorption pads can solve the road noise and tire noise well. 1, the vehicle engine is a noise source, and its noise generation varies with the engine speed.

Solution: You can add some advanced sound-absorbing foam materials to the range hood, which can not only restrain the vibration brought by the range hood, but also absorb a lot of noise, and the effect is obvious.

2. When there is a leak in the intake and exhaust pipe, when the engine is started, gas will leak from the leak during the intake and exhaust process, resulting in vibration and noise.

Solution: In the face of such a situation, it is necessary to check the intake and exhaust pipes, and replacing the intake and exhaust pipes can avoid noise.

3. Tire noise is caused by the friction between the tire and the road surface when the vehicle is driving at high speed. Tire noise is determined according to road conditions. The worse the road conditions, the louder the tire noise. In addition, there are great differences between asphalt pavement and concrete pavement.

Solution: Tire noise belongs to structural noise, which mainly produces vibration. The most reasonable solution is to suppress vibration. Adding damping plates and sound absorption pads can solve the road noise and tire noise well. 1, the vehicle engine is a noise source, and its noise generation varies with the engine speed.

Solution: You can add some advanced sound-absorbing foam materials to the range hood, which can not only restrain the vibration brought by the range hood, but also absorb a lot of noise, and the effect is obvious.

2. When there is a leak in the intake and exhaust pipe, when the engine is started, gas will leak from the leak during the intake and exhaust process, resulting in vibration and noise.

Solution: In the face of such a situation, it is necessary to check the intake and exhaust pipes, and replacing the intake and exhaust pipes can avoid noise.

3. Tire noise is caused by the friction between the tire and the road surface when the vehicle is driving at high speed. Tire noise is determined according to road conditions. The worse the road conditions, the louder the tire noise. In addition, there are great differences between asphalt pavement and concrete pavement.

Solution: Tire noise belongs to structural noise, which mainly produces vibration. The most reasonable solution is to suppress vibration. Adding damping plates and sound absorption pads can solve the road noise and tire noise well.