i wrote: > Not only. The function includes also the hammer speed and the strings > impedance (including mass and tension of the string). and also the feltīs damping. ----- Original Message ----- From: "Bernhard Stopper" <b98tu@t-online.de> To: "Pianotech" <pianotech@ptg.org> Sent: Saturday, October 02, 2004 3:46 PM Subject: Re: Evidence of overlacquered hammers > David wrote: > > > > The amount of energy imparted to the string which is > > > transferred to the soundboard is a function of mass and/or density of > > > the object striking the string. > > Not only. The function includes also the hammer speed and the strings > impedance (including mass and tension of the string). If you put in the > same amount of energy into the key, the speed will be lower so the loudness > will not change therefore. With a heavier hammer you will get louder lower > partials, but less higher partials. May thatīs why you have the impression > of a louder sound. But the overall energy does not change. > > Bernhard > > ----- Original Message ----- > From: "Bernhard Stopper" <b98tu@t-online.de> > To: "Pianotech" <pianotech@ptg.org> > Sent: Saturday, October 02, 2004 3:22 PM > Subject: Re: Evidence of overlacquered hammers > > > > David, > > > > Yes thatīs what i say. As long as you put the same amount of energy into > the > > key, the sound will not be louder. This the principle of conservation of > > energy. > > > > Bernhard > > > > ----- Original Message ----- > > From: "David Love" <davidlovepianos@comcast.net> > > To: "'Pianotech'" <pianotech@ptg.org> > > Sent: Saturday, October 02, 2004 2:34 PM > > Subject: RE: Evidence of overlacquered hammers > > > > > > > What you are saying then is that heavier and/or harder hammers do not > > > make the sound louder except by the excitement of a different set of > > > partials. That's just not the case. I'm sorry but I believe you are > > > misinformed on this. But don't take my word for it, ask a physicist or > > > an engineer. The amount of energy imparted to the string which is > > > transferred to the soundboard is a function of mass and/or density of > > > the object striking the string. > > > > > > David Love > > > davidlovepianos@comcast.net > > > > > > -----Original Message----- > > > From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] On > > > Behalf Of Bernhard Stopper > > > Sent: Saturday, October 02, 2004 1:21 AM > > > To: Pianotech > > > Subject: Re: Evidence of overlacquered hammers > > > > > > David wrote: > > > > > > >A panel which > > > >moves less efficiently will require more mass, density or both from the > > > >hammer in order to achieve the same displacement of air by its motion > > > >than a panel that moves more efficiently for which a softer hammer will > > > >achieve the same result. > > > > > > No i donīt agree, because there is the string between the soundboard and > > > the > > > hammer. If the string is too thin, more mass in the hammer has no > > > possibility to arrive at the soundboard. > > > > > > Bernhard > > > > > > > > > ----- Original Message ----- > > > From: "David Love" <davidlovepianos@comcast.net> > > > To: "'Pianotech'" <pianotech@ptg.org> > > > Sent: Saturday, October 02, 2004 2:40 AM > > > Subject: RE: Evidence of overlacquered hammers > > > > > > > > > > My understanding is that the soundboard is a transducer, not an > > > > amplifier--there is no added energy--it's function is to convert > > > energy > > > > of the vibrating string into a larger moving body which has the > > > ability > > > > to move the air which the string by itself does not possess in > > > > sufficient quantity. The panel's ability to do that is a function of > > > > several factors including: panel thickness, rib dimensions and > > > > stiffness, crown, spring rate, type of rim, location of bridges and > > > > probably other things which I have forgotten. Not all soundboards > > > will > > > > move with the same efficiency and some will move too much--or some > > > areas > > > > of the panel will. The hammer imparts a blow to the strings and the > > > > energy imparted is a function of hardness, mass or both. A panel > > > which > > > > moves less efficiently will require more mass, density or both from > > > the > > > > hammer in order to achieve the same displacement of air by its motion > > > > than a panel that moves more efficiently for which a softer hammer > > > will > > > > achieve the same result. How the partials develop is a somewhat > > > > different issue, which I am not addressing here. > > > > > > > > So, if not all panels are created equal, then one hammer will not > > > yield > > > > the same result on different panels. How much different the panels > > > need > > > > to be to be able to hear that is another issue. > > > > > > > > David Love > > > > davidlovepianos@comcast.net > > > > > > > > -----Original Message----- > > > > From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] On > > > > Behalf Of antares > > > > Sent: Friday, October 01, 2004 12:52 PM > > > > To: Pianotech > > > > Subject: Re: Evidence of overlacquered hammers > > > > > > > > > > > > On 1-okt-04, at 21:41, Bernhard Stopper wrote: > > > > > > > > > The time, the hammer is in contact with the string is the main > > > effect > > > > > of how > > > > > many partials and in what weight they will occur. The soundboard > > > > > itself has absolutely no possibiliy to add any partials to the > > > strings > > > > > spectrum (except the short shock spectrum caused by the hammer > > > impact) > > > > > > > > > and > > > > > acts only as an amplifier and filter. But the oscillator is the > > > > string. > > > > > > > > > > best regards > > > > > > > > > > Bernhard Stopper > > > > > > > > > > > > > Exactly. Thank you for your clear explanation Bernhard! > > > > > > > > André Oorebeek > > > > > > > > _______________________________________________ > > > > pianotech list info: https://www.moypiano.com/resources/#archives > > > > > > > > > > > > _______________________________________________ > > > > pianotech list info: https://www.moypiano.com/resources/#archives > > > > > > _______________________________________________ > > > pianotech list info: https://www.moypiano.com/resources/#archives > > > > > > > > > _______________________________________________ > > > pianotech list info: https://www.moypiano.com/resources/#archives > > > > _______________________________________________ > > pianotech list info: https://www.moypiano.com/resources/#archives > > _______________________________________________ > pianotech list info: https://www.moypiano.com/resources/#archives
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