Many Types Of Noise And Few Nuts

Many types of noise and few nuts

Introduction

The noise spreads by various means, in that sense it is feasible to talk about speed of sound in solids, speed of fluid sound, and within the latter, speed of sound in gases. With respect to the propagation of noise through a pattern of “spherical wave”, also called the propagation of waves concentrically; In the figure that continues, said behavior is represented graphically.

Also, depending on the environment by which the sound or its most specific variant is spread, the noise, there are referential values ​​that are based on the temperature of the medium. In the table that continues some values ​​for the spread of sound whose speed is the speed of sound. On the other hand, it is noteworthy that of the various material means by which sound spreads, propagation through gases is the most frequent, in effect: "Almost all the sound waves we hear spread in the air".

Developing

There are two more usual ways to typify noise, these are: depending on the intensity in conjunction with the period and depending on the frequency. With respect to the types of noise according to their intensity and period, Herrera del Rey highlights the following:

• Continuous or constant noise. That noise whose intensity remains constant or has small fluctuations, over time.
• Fluctuating noise. That noise whose intensity varies over time, being able to present periodic or random fluctuations.

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• Impact or impact noise. That noise whose intensity increases abruptly during an impulse. For having everything impulse a transitory character, the duration is brief, compared to the time between one impulse and another.

On the other hand, with respect to the types of noise having as a typification parameter the frequency of the noise, it is to be noted that these can be up to three types; In that sense, Herrera del Rey defines these noises in the following terms:

1. White noise. Named by association with white light, it is characterized by its uniform distribution in the audible spectrum.
2. Pink or pink. That noise whose frequency response is not flat, its intensity declines 3 decibels by eighth. With respect to the latter, it is to remember that the frequency range that is audible by the human person is between 20 Hz and 20 KHz and these are in turn divided into intervals called octaves and thirds of eighth.
3. Brown noise. Although it is not a very common noise, but it exists in nature. Brown noise is mainly composed of serious and medium waves.

In addition to the types of noise cited, it is to emphasize that there are artificial noise or noise generators that emit white or pink noise. Artificial noise sources are used in acoustics to perform tests and measurements of functional characteristics of the noise among which acoustic insulation, soundproofing, and, reverberation or permanence of the sound once the original source has stopped emitting it.

Spread

The propagation of noise, because a wave is given in such a way that the particles of the medium move or vibrate perpendicularly to the direction of propagation of the wave; that is, they spread through a spherical "wave", since their wave fronts are concentric spheres that leave the disturbance source.

Likewise, there is another way to typify the presence of noise, but not the noise itself, it is the one that has to do with the area or area where it spreads; In that sense it is possible to talk about urban noise and rural noise. Urban noise is one that spreads in an urban environment, which is normatively controlled for the benefit of the populations that inhabit the cities. 

For more detail on the levels of permissible noise in the urban area, in Annexes See: Guide for urban noise in specific environments. Finally, noise in the urban area is associated with their source, in that sense it is possible to distinguish the following types of urban noises:

• Traffic noise. That noise that has the vehicular traffic as a source and is determined by a series of factors, among which are: the noise of individual vehicles, in effect, the noise will depend on the type and size, speed and transmission ratio of vehicles; The vehicular flow, in effect, the noise will depend on the flow of traffic or transit intensity, that is, the number of vehicles that circulate per hour; The composition of the traffic, in effect, the noise will depend on whether the flow is continuous or pulsating, or of whether the streets have traffic lights or not, have toll stalls or not, etc.; And, the slope of the road, in effect, the noise will depend on the slope of the circulation route, since if it is greater than a few degrees, it has a very large incidence in the resulting noise, because it forces to lower the Transmission ratio for a certain speed.
• Industrial noise. This type of noise can be considered from two points of view: the noise within an industrial plant and the noise that the plant emits outside the same. Internal noise has work important and external noise affects the neighboring community to the plant.
• NOISE OF CLATING PREMISES. Noises from premises such as discos, convention centers, etc.

For its part, rural noise is understood as that noise that spreads in rural areas, in this context and in most cases, emitting sources are characterized by being mobile and eventual, so we have the following types of noise:

• Mobile noises. The noise from the roads that cross rural areas.
• Eventual noises. Those who come from the realization of a public works.

conclusion

The identification of noise sources immediately refers us to the noise -generating sources that can be natural or artificial. The identification, understood as the location of the punctual source that emits a sound power, the noise, is intuitive and is carried out by approaching the source increased the intensity of the sound, and/or departure from the source decreased sound intensity. Regarding the latter, Ramos points out: 

The noise can be emitted from a timely focus, a spatial focus or a linear focus a car in circulation. The noise is decreasing as the distance with respect to the focus is increased. With respect to noise emitting sources, the context in which they are generated must be taken into account, that is, the acoustic fund and the elements that due to their distribution and abundance allow to characterize the environmental noise by geographical areas and/or populated areas. In an urban context, the identification of noise sources considers noise emitting elements described in the table that continues.