Directions and methods of sound proofing

The car is the place where a person spends much of their time. That is why the owners of the machines try to pay attention not only to technical aspects but also the comfort and safety of vehicles. In this respect one of the greatest challenges they have to face, is the background noise occurring during the drive. It can be monotonous and swings, Intrusive and tenuous, but in any case, the effect of his actions could be the unfavorable. He dulls the attention of the driver, increases the degree of fatigue that significantly reduces traffic safety.

The level of internal and external noise

For a modern city, not to mention metropolis is not only the interior space of the vehicle, but also the external environment. All sounds produced from their work, merging together, create an acoustic load on the living space of millions of people suffering from the external noise factors. The existing rules reglamentary not only the intensity of sound and noise in cabin pressure, but the total produced noise from the operation of the machine.

Requirements for transport in Western European countries quite hard and regularly reviewed downward the limit values. For example, the external noise today, they amount to no more than 74 dBA. Domestic regulatory framework provides for the noise of about 77 dB. However, this integrated measure does not always give an accurate picture of noise exposure, since, while remaining within acceptable limits in General, in certain frequency ranges, this figure can be "off-scale". On certain modes, this is manifested in the roar, whistles, whines when etc.

System of measurement sound waves is a logarithmic scale, therefore, the change in noise on several units leads to a significant transformation of the sound environment inside and outside the vehicle. With this purpose in automotive industry widely used means of noise reduction, which ensure the reduction in the intensity and pressure of acoustic oscillations.

Object study sound proofing

Choosing the right direction, methods and means of control of noise requires the detailed study of aspects that contribute to the formation of the sound field of the vehicle. In industrial and laboratory tests carried out on machines with run-in engine, measuring noise levels in various modes and loads. Thus control measurements are taken at the points of location of the driver and passengers, as well as outside. The results obtained serve as a basis for identifying opportunities and ways to reduce noise levels.

The obtained data can serve as a starting point in the process of reducing harmful effects from the operation of mechanisms and elements of the device of the vehicle. However, to obtain the most complete picture of the ways of dealing with excessive sound effects, it is necessary to pay attention to the following nuances:

1. The most loaded and subject to vibration point of the exterior and structural elements that create the highest frequency and amplitude;
2. The ratio of aerodynamic and mechanical components of the overall sound space;
3. The path of penetration and propagation of noise from its source;
4. The frequency of the oscillations of the trim parts, panels, auxiliary equipment and fixtures.

Such an analysis allows to take into account the greatest number of aspects that generate noise load, and to take the necessary steps to reduce it.

Ways and methods of dealing with autosomal

In strategies to prevent the negative influence of acoustic vibrations on humans and the environment can distinguish two approaches. It is a constructive technical solution and passive protection of the available sources of sound pollution space. We consider each of them in terms of activities and methods to achieve the results.

The method of constructive changes involves:

• balancing nodes and adjustment of parts of the transmission;
• the installation of the elastic intermediate means in the connection of the engine, suspension, chassis and exhaust system;
• the effective work of the exhaust system with the most rigid mount of the muffler along the bottom and the device damping vibrations absorbers;
• compliance with density and reliable mounting of the basic parts and finishing elements;
• quality seal of door and window openings.

Passive protection method is implemented:

• install protective covers to prevent spread of noise;
• using materials with properties of sound insulation, reflection and absorption of sound waves.

It is clear that the first method is more in the hands of the manufacturers and with the drivers requires the maintenance of a normal technical condition of the existing means of dealing with noise impacts. But passive protection can be completely secured products, designed to isolate the place of origin of sound vibrations from the inner space of the vehicle and the external environment. You can always buy from the online store DD Tuning.