ML070120304

JAFNPP - SEIS Web References - Chppm Noise Levels of Army Equipments

ML070120304
Person / Time
Site:	FitzPatrick
Issue date:	12/27/2006
From:	US Dept of the Army, Ctr for Health Promotion & Preventive Medicine
To:	Office of Nuclear Reactor Regulation
jmm7
References
Download: ML070120304 (7)

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'Noise Levels Page I of 7 I

Advanced Search rGO-US Army Center for Health Promotion and Preventive Medicine Hearing Conservation Program USACHPPM Home Page Hearing Conservation Home Page Hearing/Hearing Loss Prevention Hearing Protective Devices DOEHRS-HC Hearing Checks About Noise Noise Levels of Common Army Equipment Fact Sheets Health Education Training Tools Noise Levels of Common Army Equipment (Print-friendly version)

The sound levels listed in tables A-1 and A-2 are the highest typical measured values under normal operation.

For most items of equipment there may be several normal operating conditions. Each condition generates a different noise level. For example, there is a 5 to 10 dB difference in noise at the driver position of a truck depending on window closure and auxiliary equipment such as heater fans. There can also be some variation among individual units of the same type of equipment. Different test reports may list somewhat different levels.

Table A-1 Regulations STEADY NOISE Compensation Reports Army Charts Cost Effectiveness of HCP DOEHRS-HC Training Courses HCPEP Survey Links to Professional Organizations Links Disclaimer Coding FAQs Speed Sound Photo Model Name, Condition Location km/hr or Level I _(mph) dB(A)

M966, also:

High mobility multi-wheeled Crew positions 0(idle) 7E M996 vehicle (HMMWV), at 2/3 M997 payload M1037 and other 48(30) non-heavy

__________________________________88(55) 9_____

M996 lesc HMMWV mini and maxi Patient areas up to 88 thar M997 ambulance, at 2/3 payload (55)

M1097 HMMWV heavy variants, at up to 50 lesp 2/3 payload Crew positions (31) thar M 1 097A2 8r 64(40) 8E M1114 80(50) 96(60) 9_

up to 40 (25) less thar M1097 HMMWV heavy variant, at full Crew positions http://chppm-www.apgea.army.mil/hcp/NoiseLevels.aspx 12/27/2006

'Noise Levels Page 2 of 7 Ir-~

payload 81, I0C 96(60)

M1008 M1009 Mi010 Commercial utility cargo vehicle (CUCV)

In cab below 88 (55) lesE thar8E 85 tc 91 M1028 88(55) 51 M1010 Ambulance all belo" Patient Areas speeds M1080 Light medium tactical vehicles In cab 0 idle 8C

chassis, (LMTV 2 1/2 ton trucks), 2/3 72(45) 84 includes payload M1078 75(46)

M1079 M1081 88(55) 8K Medium tactical vehicles (MTV In cab 0 idle 8C M1092 and 5 ton trucks), 2/3 payload M19672(45) 84

chassis, except 75(46)

K M 1089 wrecker 88(55) 8K up to 48

lesE, M1089 5 ton wrecker, towing, 2/3 In cab (30) thar payload K

56(35) 87 S

M984E1 Heavy Expanded Mobility In cab 64(40) belo*

Tactical Truck (HEMTT) and 8b below 72(45) 93.1 M44A3 2 1/2-ton truck, extended life In cab Idle 72-81 l series program (ESP), 2/3 payload 16(10) 8r includes M35A3 32(20) 87 S M35A3C M36A3 80(50) 97 Heavy Equipment Transporter In cab All Below M1070 (HET), loaded speeds K

M1074 Palletized load system, 16.5 In cab, All 85 ob M1075 tons windows speeds beloA closed Windows open 88(55) 87 below

belo8,

__________88(55) 8______

M 1 13A3 family including Armored Personnel Carrier A3 version. M113, M113A1, M113A2, OSV(BMP2) have Idle 85-92 16(10) 10oE http://chppm-www.apgea.army.mil/hcp/NoiseLevels.aspx 12/27/2006

• Noise Levels Page 3 of 7 Ii M 106A2 M1 064A3 M1 059A3 M58A3 M730A2 M901A3 M981A3 similar noise levels 32(20) 48(30) 63(40) 1 Oý 114 11E

MlA2, Idle Abrams tank In vehicle Ml, M1Al Ml chassis similar Grizzley breacher, Wolverine Heavy assault bridge (HAB)

Tac idl 16(10) 48(30) 63(40) 1 01 10QE 114 117/

12A2 Idle 74-9E Bradley Fighting Vehicle In vehicle M2, M3,

M2A1, M3A1, M3A2 similar 16(10) 32(20) 61(38) lic 11 Ir 11E M88A2 Hercules recovery vehicle In vehicle various 89 tc 10 E II M270 Multiple Launch Rocket In vehicle Idle 83-9E System (MLRS) vehicle

'*i;*

Moving,e various 111 speeds Idle M109A3E2 other versions similar Paladin, 155 mm self propelled howitzer In vehicle

Moving, various speeds 83-9E 99 tc 111 MEP-802A 5 kW Tactical Quiet Generator (TQG)

Operator panel Rated load 8C

'-803A 10 kW TQG Op panel Rated load 81 II MEP-804A 15 kW TQG Op panel Rated 84 MEP-805A 30 kW TQG Op panel Rated load MEP-806A 60 kW TQG Op panel Rated load 87 http://chppm-www.apgea.army.mil/hcp/NoiseLevels.aspx 12/27/2006

'Noise Levels Page 4 of 7

-H-47D Chinook helicopter Cockpit 102.r UH-60A Blackhawk helicopter Pilot copilot 10E 10EO YAH-64 Apache helicopter Pilot 104 copilot 101.3 N

OH-58D Kiowa helicopter Right seat Left seat 101.E 100.3 UH-1H HPilot/copilot 101.ý x

Huey helicopter

• i*':;iMax in rear 102.c Table A-2 IMPULSE NOISE Sound Photo Model Name Location Level dB(P)

[

M

[16A2 5.56mm rifle Shooter 157

ýZVA M9 9mm pistol Shooter 157 5.56mm Squad Automatic 0249 Weapon (SAW) fired from a Gunner 159.5 HMMWV 11 M60 7.62mm machine gun fired from a Gunner 155 http://chppm-www.apgea.army.milihcp/NoiseLevels.aspx 12/27/2006

'Noise Levels Page 5 of 7 H-MMWV 0.50 caliber machine gun fired from a HMMWV Gunner 153 MK 19 Mod 3 machine gun fired from a HMMWV Gunner 145 Grenade At 50 ft 164.3 saw M3 MAAWS recoilless rifle Gunner 190 MLight Antitank Weapon (LAW)18 Gunner open 159.9 Position Gunner enlosed 166.2 p osition Gunner fighting 172.3 position 105MM towed howitzer at charge 8 1-ý M198 155mm towed howitzer Gunner 178 firing M203 propellant M109A5/6 Paladin, 155mm self In fighting 166.1 propelled howitzer firing compartment, M4A2 zone 7 charge hatches open except driver's 8-inch self propelled

.v1110A2 howitzer firing M 106 Gunner 176.9 projectile with a M 188A1 zone 9 propelling charge, M224 60mm mortar, M888 round, charge 4, QE 800 mil D.5 m from the muzzle, 0.9 m above ground, 105 degree azimuth 185 http://chppm-www.apgea.army.mil/hcp/NoiseLevels.aspx 12/27/2006

-Noise Levels Page 6 of 7 TOW II Missile from

.4 V

Gunner 179.

M29A1 81 mm mortar, M374A3 1 m from the 178.8 round with muzzle, 0.9 m charge 4 above ground, 135 degree azimuth A-2. Characteristics of individual equipment noise. The following paragraphs summarize noise exposure considerations for common Army equipment:

a. Trucks and High Mobility Multi-wheeled Vehicles (HMMWV). Noise levels increase with increasing speed and, for HMMWV, with increasing load. The levels are below 85 dBA at low to medium speeds and can be over 100 dBA at top speed for some models. When driven mostly at low speeds with short periods at moderate or high speed trucks and HMMWVs are not hazardous. They can be hearing hazards to uprotected soldiers if operated for long time periods at high speed.

b. Bradley Fighting Vehicle (BFV) and derivatives. The major noise source is the drive train, particularly the action of the track links as they round over the sprockets, idlers and wheels. For this reason, high noise levels (101 to 115 dBA) occur when the vehicle is in motion. The crew wear the combat vehicle crewman's (CVC) helmet which has integral hearing protectors. A CVC with active noise reduction (ANR) providing added noise protection is available on newer models. The passengers (infantry squad) must rely on their own hearing protectors such as earplugs. These are less effective than the CVC with ANR. For training, the exposure time in moving carriers is restricted depending on the hearing protectors worn and the speed of the vehicle. The severest restriction is on exposure of passengers wearing the less effective earplugs.

c. MI 13 Armored Personnel Carrier and derivative vehicles. Among the loudest of Army equipment. Noise sources and hearing protection are similar to the BFV. Levels are very high when moving.

d. Abrams Tank and derivative vehicle (Wolverine and Grizzly).

(1) Steady noise levels range from 96 to 117 dBA when moving. The crew wear the CVC helmet which has integral hearing protectors.

(2) On the tank, impulse noise levels at exterior commander and loader positions are above or just below the limit of hearing protector effectiveness for training depending on caliber (105 or 120 mm), cartridge model, and tube elevation. The drivers hatch should be closed at all times when firing the main gun. Training with crew heads above the hatch plane is not permitted per the user manuals for certain defined conditions. These restrictions are not applicable to battle situations.

e. Helicopters. In flight, helicopter crews wear the helicopter crew helmets which have integral hearing protectors. Passengers must rely on their own hearing protectors such as earplugs or ones supplied by the air operations. Training restrictions on exposure time apply, as discussed for the BFV.

http://chppm-www.apgea.army.mil/hcp/NoiseLevels.aspx 12/27/2006

,Noise Levels Page 7 of 7

f. Generators. Diesel powered generators form the Tactical Quiet Generator (TQG) series are quiet at the operator panel and other close-in areas if the covers are in place. Older generators have been loud with levels above 100 dBA at the panel and above 85 dBA up to several meters away. High levels are generated by TQG if the covers are removed. See (Figure 2 ). for comparison of the noise imact from generator types.

For additional Information click here

g. Impulse noise from weapons. All firearms produce impulse noise levels requiring hearing protection at crew positions for training. Some produce levels under certain conditions, which exceed the safe training limit for crews wearing hearing protectors.

(1) Small arms-rifles pistols, machine guns, and 40 mm grenades. Noise levels at gunner positions are low to moderate. The hazard can be serious because of the large number of rounds that can be fired by the individual shooter. Noise levels are higher in front and to the side of the muzzle than to the rear. For small arms levels at about 5 feet to the side can be higher than at the shooter position. Except very near the muzzle, all levels are within the mitigation capability of hearing protectors.

(2) Mortars. Noise levels range from low to very high because of the wide variation in charge increments and head locations. The requirement to load the cartridge through the muzzle places the head close to the muzzle, which is the source of the impulse. For the top charge on the large ground mount mortars, a safe noise level for training occurs only at 2 m from the muzzle, no higher than 0.9 m above ground. Some mortars include a funnel-shaped blast-attenuating device on the muzzle.

(3) Howitzers without fighting compartments. For the 155 mm towed and 8-inch self-propelled howitzers the levels are medium to high depending on the charge increment, but are below the training exposure limit for protected soldiers.

(4) Howitzers with fighting compartments. For the 155 mm self propelled howitzer the walls of the fighting compartment tend to attenuate the peak levels but the reverberation within the compartment aggravate the noise exposure. For some higher charges the front, top, and side hatches should be closed during training fire.

(5) Tanks. The levels above the turret hatches can be very high for some cartridges and at some tube elevations. For these, training fire with crew heads above the hatch plane is not recommended. Levels below the hatch plane, even with the hatch open, are lower.

(6) Rocket launcher vehicles. Impulse noise in the MLRS, Avenger, and FOG-M launchers are low to medium.

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