nishantshivam Posted July 8, 2015 Share Posted July 8, 2015 Why do jackhammers and all other percussive drills make noise despite having a shock absorbing system? Why can't we design a structure that can get rid of the noise? we can use, may in some ways, the conservation of energy law to make use of the sound energy and in turn gain more efficiency in the drilling process. There's construction work going on in my neighborhood. Hence, this discussion. Link to comment Share on other sites More sharing options...
studiot Posted July 8, 2015 Share Posted July 8, 2015 (edited) The energy lost to sound is negligable in a jackhammer and inherent in the mechanics. Muffler arrangements do exist, but they simply absorb the sound, they do not and cannot prevent it. Having said that some hammers are noisier than others. Edited July 8, 2015 by studiot Link to comment Share on other sites More sharing options...
swansont Posted July 8, 2015 Share Posted July 8, 2015 The energy lost to sound is negligable in a jackhammer and inherent in the mechanics. Indeed. The mount of energy in what we think of as loud sound is amazingly small. 120 dB - pretty loud - is just 1 Watt https://en.wikipedia.org/wiki/Sound_power Link to comment Share on other sites More sharing options...
iNow Posted July 9, 2015 Share Posted July 9, 2015 How much of the noise comes from the hammer itself and how much comes from the repeated impact it makes with the solid ground? Smash a flat shovel on the ground over and over and it will make a loud noise, and this is true no matter how well designed the shovel. Likewise with a framing hammer hitting a nail... Link to comment Share on other sites More sharing options...
Endy0816 Posted July 9, 2015 Share Posted July 9, 2015 1 Link to comment Share on other sites More sharing options...
StringJunky Posted July 9, 2015 Share Posted July 9, 2015 Yes! Erect vacuum tents over the work site, with the workers suitably attired, problem solved. 1 Link to comment Share on other sites More sharing options...
Endy0816 Posted July 10, 2015 Share Posted July 10, 2015 For every problem there exists an Engineering solution 1 Link to comment Share on other sites More sharing options...
Enthalpy Posted July 17, 2015 Share Posted July 17, 2015 Most noise comes from the air exhaust and could certainly be reduced. You get an idea of the percussion noise by hearing a hand-held hammer drill (remembering the size ratio) or by hearing distinctly both noises.Could the percussion noise be reduced too? Not so much if the tool must break hard material like concrete, for which peak force is paramount. In a first approximation, the shock of the piston on the hammer must be as hard as the target material. But with an adjustment, less hard parts would be used for asphalt.In countries where jackhammers were recognized as harmful for the workers, disc saws replace jackhammers on most occasions, especially to open asphalt. Link to comment Share on other sites More sharing options...
Sorcerer Posted August 16, 2015 Share Posted August 16, 2015 This ties in a bit with my thread on piezoelectricity and roads, perhaps piezoelectric crystals could be used as shock absorbers, helping to dampen the noise and recover some of that (even if only slight) energy loss. I'm guessing this has been thought off and overlooked due to cost/benefit ratios though. Link to comment Share on other sites More sharing options...
Enthalpy Posted August 17, 2015 Share Posted August 17, 2015 If shock damping were acceptable for the function of a jack hammer, it would be easy to achieve by many cheap means. But how to break concrete with a soft shock? Link to comment Share on other sites More sharing options...
Sorcerer Posted August 18, 2015 Share Posted August 18, 2015 Well if there is inefficiency in the recoil that could be used to generate current. Waste energy as noise is one of those inefficiencis, shock absorbed to the operators arms, not directed back to impact for breaking is another. I know there is no such thing as perpetual motion machines, but there are maximum efficiency machines. So why not transfer that ease energy to a more useful form and at the same time reduce noise and impact on the operator? Link to comment Share on other sites More sharing options...
studiot Posted September 2, 2015 Share Posted September 2, 2015 Here is the ultimate piledriver quieting system. https://www.youtube-nocookie.com/embed/cFb0nLCKypg?rel=0 3 Link to comment Share on other sites More sharing options...
imatfaal Posted September 3, 2015 Share Posted September 3, 2015 Here is the ultimate piledriver quieting system. https://www.youtube-nocookie.com/embed/cFb0nLCKypg?rel=0 Love it! Link to comment Share on other sites More sharing options...
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