Vibration and noise control of chipping hammers.
Molisani L; Burdisso R
Nature and Technology side-by-side, proceedings of the 11th Pan-American Congress of Applied Mechanics, January 4-8, 2010, Foz do Iguacu, PR, Brazil. Aguiar AR, ed. Austin, TX: American Academy of Mechanics, 2010 Jan; :24
Pneumatic percussive power tools are extensively used in construction, industrial, and mining sites. They are one of the noisiest machinery used in the construction industry, generating noise levels well above of 110 dB. Besides, the vibration from the hand held power tools lead to the hand-arm vibration (HAV) disorder such as pain, numbing, and blanching of the fingers known as the white finger disease. Techniques to reduce noise and vibration have been developed, however they are not sufficiently effective. The main goal of this effort is to reduce the noise and vibration levels of a chipping pneumatic hammer by using a single integrated device. A prototype was developed to control noise and vibration of a chipping hammer. The vibration control is based in the implementation of simultaneous Impact Vibration Absorbers (IVAs). The noise control is based on using compact silencers and re-directing the noise away from the tool operator. A prototype vibration/noise control device was fabricated and tested. The results indicate good reduction of the implusive accelaration, e.g. peak reductions of 27%. Noise measurements show the effectiveness of the acoustic treatment implemented in the new device. Noise reduction is achieved over a wide frequency range, e.g. from 125 to 4000 Hz range. Maximum reduction occurs in the 1250 Hz band with and attenuation of 6 dB. it is important to remark that the noise reduction achieved in the low frequency range can complement the good noise reduction performance of other such as ear muffs.
Pneumatic-tools; Power-tools; Tools; Construction-industry; Construction; Noise; Noise-exposure; Noise-induced-hearing-loss; Noise-levels; Noise-pollution; Repetitive-work; Vibration-effects; Vibration; Vibration-exposure; Hand-injuries; Hand-tools;
Author Keywords: vibration control; noise control; impact vigration absorbers; chipping hammer
Leonardo Molisani, Grupo de Acustica y Vigraciones (GAV), Department of Mechanics, National University of Rio Cuarto Ruta Nacional 36 km. 601. (X5800BYA) Rio Cuarto, Cordoba, Argentina
Nature and Technology side-by-side, proceedings of the 11th Pan-American Congress of Applied Mechanics, January 4-8, 2010, Foz do Iguacu, PR, Brazil
Virginia Polytechnic Institute and State University