Noise From an Industrial Rifle Range

Proceedings of the Instltute of Acoustics mmmmmm maanmu LM Many of the noise control prrdolers involved in the planning of an industrial rifle mge are similar to those found in the planning of any factory where high squid levels are acperienod.For sample, the noise problen can be divided into two distinct categories, as sham below:1) Ihe protection of operator from hearing damage.2) no protection of the neighbours from noise annoyance.mo factors which can unite the noise problems of an industrial rifle range partioilarly diffiuilt are the very high and impulsive nature of the strand am and the general reguirene-It for rifle ranges to be nit-doors.These, coupled with other canplioatiom, such as the wide range of guns that may be reqzired to be usei (yet mnnot be firs!until the range is licaxcd) and the psychological associatims of gunfire which could cause amoyance outcfallpropoztimtothesomdpresairelevel,makemeplanning ofa rifle range mom diffiwlt.As with any noise control engineering problem it is advantagews to have a knowledge of the basic principals of the noise gmeration.In the case of gunfire noise this is covered in the scimoe kmm as ballistics. LSIBMICW'ihe gun is a devim, in which heat is generated iron the burning of propellant.As the propellant turns, its surface undergoes menial reactions, which generate high pressure (and tanperamre) in the Sirrwnding gam.As the propellant turns within the fixed volume, the pressn e rises until the projectile starts to me along the barrel.'Ihis increases the volume and hence moderates the pressure.he propellant turns so rapidly that the motion of the projectile cannot fully ompensate and the peak pressure is readied at approcimately me tenth of the total length of the barrel.