Key indicators of protection against noise and vibrations

Increased noise and additional sounds in the car are practically the main shortcomings that, unfortunately, prevail in many domestic cars and foreign cars. Low price does not always allow to achieve the necessary comfort, so the best option for motorists would be to use various sound-absorbing and insulating materials.

The sound proofing is critical to an acceptable level

Determination of the strength of the background noise, its impacts on humans and the environment, the effectiveness of remedies have their quantitative expression. For measurement and evaluation of noise level applied standard unit of measurement is the decibel (dBA). The application of the scale may slightly discourage the average user in the perception of the characteristics. For example, compare the sounds that emanate from a whisper (40 dBA) and jet engine (140 dB), at first glance, should give a much greater difference in their value. However, there is nothing surprising here, because this value is not a linear relationship, but logarithmic increment changes the sound level and sound pressure.

Noise levels generated by the vehicle from its engine, the interaction with the road surface, and aerodynamic forces are strongly regulated regulatory field in most countries. With the development and improvement of technologies, limit values of the parameter a regular basis (every 5-10 years) reviewed for tightening. For example, in 70-e years of the 20th century the rules of the European Commission restricted the level of external noise of the car increased in 84 dBA. Over the past four decades it has changed several times, reducing to 82, 80, 77 dBA. And currently, he is 74 dBA. The same thing, although to a somewhat lesser extent we can say about the domestic auto industry regulations. The current rules in the former Soviet Union establish the extreme border of the sound field at 77 dBA.

In reality, the majority descended from the conveyor cars do not fit into the established framework, exceeding (sometimes greatly) the maximum allowable values of noise. This is affected by the deficiencies of components, low precision machining, poor Assembly units, mechanisms and machines. To address these shortcomings, the motorists are forced to resort to tuning, setting additional noise insulation and protection for your "four-ward". Installation of these kits may not remove completely the problem of the sound of movement in the car, but it will significantly reduce the discomfort and harmful effects on humans. Ongoing studies suggest the possibility of noise reduction 2 - 5 dB depending on the initial state of the object.

The index value of the mechanical loss

The main characteristic of the means for protection against vibration is the mechanical loss factor. Its physical meaning is to determine the degree of reduction of vibration when passing through a layer of absorbing material. It is determined by the ratio of the absorbed energy of mechanical vibrations to its input level. Obviously, the higher the number, the better the vibration isolation. Primarily influenced by the material (its composition, structure, physico-chemical properties), and not the thickness of the insulating layer. Manufacturers of auto accessories is constantly experimenting with various compositions of substances and technologies to maximize the ILC, resulting in the market each year have new products to protect against vibrations and the appearance of structural noise. Although, I must say that the decisive breakthrough in this area has not yet been observed.

In respect of the installation of the vibration absorbing means in a non-professional environment, often have errors that prevent the optimal use of materials and cash. In particular, the treatment of a larger surface area of the body does not substantially improve the result, but only bring a lot of worries, troubles and inconveniences. Experience shows that the sizing of 50-70% of the area in problem areas gives a comparable effect with a solid mounting. Many car owners believe that if you install multiple layers of protection, it will bring double or triple favor, although it is not so. This principle only works when combining diverse means of protection, for example, vibration damping and noise insulation. Therefore, the purchase of sets of insulation materials should be based on their reasonable application in the first place to consider the ILC.

Feature noise-reducing means

In General, the number of goods for protection against acoustic pollution of the space we can distinguish them in two main categories. Is an insulating and absorbing means. The first is aimed at the "closure" of sound in a certain space and preventing its spread into the environment. An example of this is the encapsulation of the engine compartment. Absorbing materials are designed to suppress and dissipate the initial sound pulse, thus reducing its energy and influence on objects in the zone of contact with the source of the noise.

Reliable protection against excessive acoustic oscillations is determined by their frequency and amplitude movement of particles of space, so getting a universal protection from all sources of their occurrence is problematic or inefficient in terms of resources expended. With high-frequency sounds are good products with low density and thickness, whereas noise in the low and middle range require a more structured and dense materials. Sound absorption based on the properties of substances having a honeycomb structure, take the majority of the energy of the acoustic waves repeatedly reflect and dissipate them within its structure. Such products will be particularly relevant when installing audio and multimedia systems. They processed the area of the speakers to eliminate extra speakers on the periphery of the device which may cause rattling of the panels.

Summing up some conclusions from the foregoing, we emphasize that the only reasonable application of anti-vibroacoustic phenomena will allow to fully achieve their results. In addition, this approach can save a significant portion of the budget to carry out autotuning. Well, not to make a mistake on the product, it is better to stay on his purchase from a reputable supplier, such as Internet-store car audio and tuning DD Tuning.