Noise blasting

A somewhat different application of foam is in blast and fire suppression during attempts to deactivate, or intentionally destroy, suspected terrorist bombs. When such a device, or even a small explosive device used to destroy the suspected item, explodes, severe damage can be caused by the compression wave emanating from the blast or from the fireball that may follow the blast. In Section 9.6 it was mentioned that foam blankets have been developed for blast noise and pressure wave... 

Yoshida T., Wada Y., Kobayashi N. and Saito T., "Reducing the Blasting Noise of... 

Although the suppressor will eliminate muzzle blast noise,flash and smoke, a super sonic crack will be heard when standard 5.56 NATO or commercial. 223 ammo is used. If special circumstances dictate maximum sound control and allow for reduced range and stopping power,the crack can be eliminated by firing specially loaded subsonic rounds. 

Neutralization or Demilitarization Hazardous items may be neutralized by detonation in place, or they may be removed to a demilitarization facility located on, or at some distance from, the site undergoing remediation. Detonation in place, which is often the only safe method for neutralization of explosive items, carries with it concerns for blast, noise, and vapor containment. Blast containment coverings tend to be heavy, bulky, and difficult to position. Sand tamping for noise control is labor intensive and time consuming, and it creates problems with dust. Reliable mathematical models for predicting the noise impact on neighboring communities do not appear to be available, although their development should not be particularly difficult. 

Wiss, J. F., Linehan, P. W. (1978). Control of vibrations and blast noise from surface coal mining (Volumes 1-lV, Report to U.S. Bureau of Mines). Bureau of Mines. 

Hearing loss caused by a sudden loud noise in one ear, or by a sudden blow to the head. In most cases, hearing loss is temporary, although there may be some permanent loss. Welding sparks (to the eardrum), blows to the head, and blast noise are examples of events capable of producing acoustic trauma. 

There are both inherent hazards in storing and handling explosives and undesirable noise and blast effects from the explosion. 

Thunderous noise during an interruption, because of air blast. The intensity can be controlled by providing silencers... 

In a fear-conditioning experiment, a neutral stimulus, such as a tone or a light, is paired with an aversive stimulus, such as a shock, a loud noise, or an aversive air blast. Following this experience, the formerly neutral stimulus becomes a conditioned stimulus (CS-F) and acquires the ability to elicit behaviors and physiological responses formerly only associated with the aversive stimulus, the unconditioned stimulus (UCS). Enthusiasm for this work derives at least partly from the precise delineation of neural circuits, down to the level of the genome, engaged by environmental components that produce fear conditioning (LeDoux,... 

The LEDC produces very little noise on detonation and for this reason can be used in highly populated areas. It is usually recommended for operations where bottom-hole initiation is desired and electric blasting caps cannot be used for fear of prematute detona-... 

The principal benefits of rubber lining are its excellent resistance to corrosive and abrasive chemicals and materials, e.g., acids, alkalies, salt water, slurries, sand, shot blast media, crushed ores etc. In addition to this, rubber linings provide other benefits including noise and vibration reduction, electrical and thermal insulation and product protection. 

Background. The report or noise of a tiring gun is numbered among the various objectionable phenomena that develop at the muzzle. Noise is closely associated with flash and muzzle blast inasmuch as attempts to attenuate any of the three will unquestionably have some influence on the other two. On the other hand, if no controlling measures are taken, secondary flash may prolong the duration of report and muzzle blast but not necessarily increase their intensity. And, since muzzle gas pressures are related to all three, noise and blast intensity may be assumed to influence flash... 

Noise produced by weapon firing can be hazardous to hearing, cause communication interference and aid the enemy in detection. A blast deflector offers relief to the crew by di-... 

Non-explosive Pwvder. When this powder is ignited it does not explode, but burns slowly with a hissing noise. It loosens and raises stones without blasting them. It is cheaper than the ordinary powder, of quite a coarse grain, and contains 3 parts of potassium nitrate to 1 of sodium nitrate. The powder is mixed in the following proportions 56.22 to 56.23 per cent, of potassium nitrate, 18.33 to 18.39 per oent. of sodium nitrate, 9.68 per cent of sulphur, and 14 14 to 15.01 per cent, of charcoal. 

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