Heliopolis "GelioPolis"
New in the noise of the car
It is easy to notice, that in the last time car manufacturers have ceased to pay due attention to the noise of cars. Old foreign cars, sometimes, much quieter new. All this is due to the fact that companies are trying to reduce the cost and simplify the process of manufacturing and operation of automobiles. That has a negative impact on the parts, which require special attention.
Question noise rarely arises when thinking about, what kind of car to buy. Tend to look at the engine power, dimensions and other parameters. Although it is from the comfort depends on the pleasure of driving. Especially if the trip takes a lot of time. There are many ways to make it quieter. This design features of the machine, various vibration and noise-absorbing materials. The Internet is full of information on this account. We won't stop. A few words about sprayed insulation.
All of the work for the protection of the vehicle from the noise of the falls in the hands of the service workers, which may, using special soundproof drugs, bring to mind the comfort inside the passenger compartment. There are a lot of auxiliary materials and products to help get rid of excess rattle, squeak and vibration. But in case, if the vehicle is new, such gaps should not be, remains to overcome the external noise. Reduce the level of noise caused by an external source of sound - the cry of a car or the signal rings, all this is an Amateur. But the noise, which is formed as a result of contact of stones, water and sand on the surface of the car will never be over reduce or even eliminate.
For this type of noise is best suited evaporated noise insulation. Preparation for spraying produce a variety of companies, for example PRIM Антишум, but the principle is the application they have very similar. After washing the car, his carefully dried, cleaned of old антикора and other materials. Cause the preparation of a special gun under pressure. This method of application provides the ability to evenly distribute the product, not forming clots and layers.
The material is applied on a chassis of the vehicle, with the outer and inner side. Dense particles, falling on the surface of the product, springs, not making a sound and vibrations.
In compliance with the layer of a certain thickness, increased acoustic insulation of the interior. The thicker the layer of the product, the higher the sound insulation. But it is important to ensure that the product did not work too much, otherwise it may happen peel.
This treatment lasts for a few years, but it always depends on the roads on which to ride. The very processing of such material includes and corrosion protection, as the drug has anti-corrosive properties. Therefore, treatment of such drugs is not only protects you from unnecessary noise, but also prolongs the life of your car for many years.
Active noise insulation
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Sound insulation of the car - the complex of measures to reduce the level of noise in the car. Transport is used mainly passive sound insulation, but there are cases, when for achievement of the set objectives using methods of active noise cancellation (for example on water transport and on some cars Toyota system (ANR Active Noise Reduction). Active noise reduction (ACP) is now one of the most popular technologies of noise reduction used in headphones and head headsets for use in aviation (helicopters, airplanes with пропеллерными engines) and for the ground transport (auto racing, especially Formula-I, heavy trucks, дорогостроительная and лесодобывающая equipment, railway locomotives).
The main principle of work of systems of the ACP simple. He is imposing on noise exactly the same signal, only in the opposite phase.
ACP is used, firstly, to reduce the level of audible operator noise to prevent the loss of hearing is a professional disease pilots, machinists and people like that, secondly, for improved intelligibility negotiations operator on the radio, which is also important.
Currently the company operates in two parallel directions of the ACP: the traditional - analog, and more promising - digital. The advantage of the first approach is the relative cheapness of products ($150-$1200), their compactness (no wiring, powered by two AA batteries), to the disadvantages - rigid attachment as to the noise situation, so for many of the physical characteristics , such as the shape of the ears of the operator, in the absence of headphones mechanical defects, etc. Relatively expensive and still is in a stage of development of method of active digital noise reduction allows you to tune in to all of these physical characteristics of the system by means of adaptive minimize the noise level inside the headphones. In addition, digital filtering allows you to not suppress, but, on the contrary, strengthen the signals of a certain type, which can be defined as useful, for example, human speech, various horns and sirens, etc. and, on the contrary, to intensify the suppression of certain frequencies of the spectrum, for example, the harmonics of the frequency of rotation of the propeller plane.
Active noise (Active Noise Control, ANC, Active Noise Reduction, ANR) is a modern high-tech development, which found a wide application in various technical devices: audio, office equipment, vehicles, aircraft, submarines and even space ships. In cars of this system for the first time applied the engineers of the company Toyota in 2008.
Active noise is designed to suppress the noise of the engine and other units in the vehicle. The system allows to lower the level of low frequency noise on 5-8 DB, which is the level of comfort comparable with noise insulation elite limousine.
Along with the increase of comfort, the application of noise reduction system provides reduction of vibration, structural elements, caused by the sound fluctuations, due to which reduces wear these elements and fuel consumption.
Active noise has the following General structure:
microphones;
the electronic control unit;
the audio system;
the speakers.
Microphones mounted on the ceiling of the vehicle interior and directly perceive negative noise. The signal from the microphone is supplied to the electronic control unit, where in accordance with the rotation frequency of the crankshaft of the engine are formed the control actions on the radio.
The audio system generates acoustic signals in the opposite phase to the noise, which is its suppression. In the system of active noise cancellation use a separate audio system.
Amplified sound signals from the audio is served on the speakers, of which two are fitted in the front doors and one (subwoofer) for the rear seat.
We modernized the system. Have made it easier and more efficient.
In our disposal there were two cars VAZ 2114 and Skoda Octavia RS. All of them had additional passive noise isolation.
Were installed 4 microphone; 1 in motor 1 in the exhaust system and 2 in подкрылках. We didn't have to reinvent the wheel, but just bought two pairs of headphones with adjustable active noise-protecting and pulled them. The signal from microphones going to фазоинверторы, and from there on regular Bluetooth ready car sound system. The difficulty was set-up and adjustment. But as a result of being in the passenger compartment of VAZ 2114, we have not heard the noise of the engine and be able to travel without the muffler. Skoda Octavia RS itself is quiet machine, and with our system is just the limo. Noises were absent completely. Silence full, but it is only on the front seats. Noise reduction in the rear seats to the 4 points on a five-point scale. The radio was the sound is amazing. The cost of all of the system (the work is not considered) about 5000 rubles, and the effect is astounding. Complexity only in the configuration. The system can be deactivated at any time. The difference is immediately visible.
Who does not agree or does not believe to write!
The lights of the car.
Dot matrix led light. Not a secret, that the illumination of the road, dimensions and brake lights play an important role in the traffic safety and comfort of driving. It is noticed, that the best coverage depends on the frequency of flashing lights of the car. The idea of progressive technology is that the car's electronics will automatically manages then headlights, depending on the driving conditions. The built-in camera in the front bumper of the car, according to designers, to be able to identify riding in a meeting of the car and shut the intense glow of some segments of the lights, in order to avoid the glare of the driver.
Feature of the given technology that shuts off the only part of the beam, which presumably could dazzle oncoming motorists. The LEDs on the basis of which is made optics allow to double the savings of the electric power consumed. Each matrix headlight is a set of four light segments, and each segment is four light source. Accordingly all optics is equipped with a 16-controlled LEDs, and each of them can be controlled individually. Well as the promise to establish the detection of pedestrians and characters. In the first case, the headlights will be «wink» foot of the presence of the vehicle, and in the second simply intense the highlight sign.
We thought that if the sync frequency of flashing LEDs with the rhythms of the human, and the reaction of the driver will be different.
EEG rhythms adult waking man:
• alpha-rhythm frequency of 8 to 13 Hertz, the amplitude of up to 100 dB. The increased level of functional activity of the brain amplitude rhythm is reduced and often it completely disappears;
• beta-rhythm frequency 14...40 Hz, the amplitude of up to 15 dB. Disappears in the performance or even the mental representation of the movement;
• Chelsea-rhythm frequency of 8 to 13 Hertz, the amplitude of up to 50 dB.
• (wichet) - аркообразный rhythm is activated during mental stress and mental tension;
• gamma-rhythm frequency 40...70 Hz, the amplitude of up to 7 dB.
• "High-beta-rhythm".
Rhythms and phenomena, pathological adult waking man:
• theta-rhythm frequency 4...6 Hertz, the amplitude of more than 40 dB (up to 300? V);
• Sigma-rhythm frequency of 0.5...3 Hz, the amplitude of more than 40 dB;
Manifestation of rhythms
• Alpha waves, 13 Hertz are observed in normal conditions, stress, anxiety.
• Beta-waves, 8 to 12 Hertz-present in the light of relaxation , positive mood and mental images.
• Theta waves, 4 - 7 Hertz - Deep relaxation , meditation , swimming working with memory and a state of focused attention.
• Delta-waves, 1-3 Herz - a deep sleep ,"clear the dream", active involvement in the
the work of the immune system.
• Gamma waves - up to the end is not studied.
Synchronizing the activity of the brain at these frequencies, you can not only deliberately change your state of consciousness, mood, emotions.
When applying the two slightly different frequencies arise heartbeat, corresponding to the difference. We have observed that in the study of vocal Opera singers. These beats can be and subsonic frequencies. For the brain doesn't matter how you call is not peculiar to him the alpha-rhythm.
It is important that the fluctuations of the инфранизкой frequency affects the Central nervous system and violates its work.
You can pick up these rhythms and combinations of tones in music, that their harmonics, that is, the sounds with frequencies that are multiples of the frequency of the main tone (they determine the timbre and character of the sound of the instrument), and the beating will be in the infrasound range.
With repeated blows with a frequency of about 3-4 attacks per second most strongly distinguishes the fundamental frequency and its harmonics, i.e., frequency of about 6-8 Hz, 9-12 Hz, etc. The rest of the frequency of a few suppressed. You consciously perceive repeated strikes and unknowingly exposed to infrasound. Remember, when the dangerous stunts in a circus orchestra "plays" drumming, emphasizes the feeling of anxiety. It is precisely because of the impact on the Central nervous system imposed by the alpha-rhythms.
We tried to pick up the frequency of flashing LEDs stop signal so that the reaction of the driver was sharper and stronger. Set the system to the Skoda Octavia RS. Like work!!!
