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| Moderated by: Tony Provencher, Richard Hefner |
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| The Physics Behind the Erhu | Rate Topic |
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| Posted: Mon Jan 25th, 2010 04:13 am |
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1st Post |
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kdavis1109 Approved
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The Physics Behind the Erhu by Erika Rose McLaughlin something I found on a google search... http://triangular.stormloader.com/erhu.html Last edited on Mon Jan 25th, 2010 01:40 pm by kdavis1109 ____________________ Thank you. |
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| Posted: Mon Jan 25th, 2010 01:02 pm |
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2nd Post |
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huqiner Approved
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Interesting! But this bit doesn't seem right: For instance, when the lower string, tuned to a D throughout this experiment, was bowed, the pitch was higher by about a quarter tone on the upbow stroke than on the downbow stroke, which matched the plucked pitch of the string. This occurred regardless of the contact point of the bow on the string. The reason for this was discovered when it was noticed that the higher string, tuned to A440, increased in pitch on the downbow. This made it apparent that somehow the strings were being lengthened by being pulled sideways toward each other. I take it that quarter tone means half of a semitone/halfstep, but that's a huge difference! There's no way that any normal erhu will have a quarter tone difference between a down bow and an up bow. It then goes on to say that the strings are slipping under the qianjin, and there's this drawing:  Note the strings are straight, going from the pegs to the bridge. I think maybe the erhu wasn't set up correctly. Last edited on Mon Jan 25th, 2010 01:03 pm by huqiner |
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| Posted: Mon Jan 25th, 2010 01:31 pm |
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3rd Post |
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kdavis1109 Approved
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This is why I posted it, I found it while surfing the web and wanted some feedback on the report... I am new to erhu, and I have no issue as of yet (knock on wood) of a tone difference on down/up bow. But I did think this link would be a good conversation thread... My issue seems to be getting a sold tone through out the lenght of the bow, I am using sensitve violin rosin but I have a black hair bow, I have been reading that I may need to invest in a white hair bow plus I need to work on my wrist movement... I am playing on 38 cm string lenght as I have smaller hands with 2cm neck to string width. Last edited on Mon Jan 25th, 2010 01:46 pm by kdavis1109 ____________________ Thank you. |
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| Posted: Fri Jan 29th, 2010 12:51 pm |
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4th Post |
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kaze Approved
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 Why does the erhu sound? Because the string vibrates. Why does the string vibrate? Because the force of the static friction is greater than that of the kinetic friction. If not, the string does not go back. This is the very point. When the string and the bow goes in the same direction, the static friction works. And when the elastic force becomes bigger than or equal to that of the static friction, the string slips. When the string slips, the kinetic friction works. Because the force of the the kinetic friction is weaker than the elastic force, the string can goes a distance in the opposite direction of the moving of the bow.
____________________ ♪二胡大好き♪ 
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| ezFolk Forums > Other Instruments > Erhu > The Physics Behind the Erhu | Top |
