31. Vibration intensity (2-4, order by PIN weight)

[ 01/31/2018 ]     Labels: 31..Intensity-TopPlate

 
Measured vibration intensity data(from 'on floor') were sorted in order of endpin weight.
There seem to be some tendencies:

(1) The behavior of top plate rather shows the similarities in the pattern between 'without pin' data and 'carbon'(:the lightest endpin).

(2) The heavier endpin selected, to the lower area shifts the vibration-center of the top plate slightly, and moreover, the mechanical vibration seems getting integrated along the whole length including the endpin.

エンドピン重量順に測定データを並べてみると、最も軽いカーボンの場合はエンドピンなしのパターンに似ており、エンドピンが重くなると最大振動中心が胴体の下方向へ少し移動して、さらにエンドピンを含めた全身振動にシフトしていくように見受けられる。

31. Vibration intensity [ Measurement 2-3 ]

[ 01/28/2018 ]     Labels: 31..Intensity-TopPlate

Vibration intensity data of cello on the top-plate, tailpiece and endpin were measured using a '8mmD' iron rod (iron alloy rod) endpin. The length of the endpin is 535mm, weight 224g(..rather heavy).

(1) Like as the previous measurements(10mmD endpin), when the tip of endpin is placed on the floor and restricted to vibrate, the vibration intensity/pattern of endpin or tailpiece changes remarkably.

(2) Cello without an endpin vibrates using its whole wood body, however if an endpin is added, the mechanical vibration seems to shift along the whole length including the endpin.

(3) Advanced Endpin Holder(AEH-011) can create the mitigated situation from the alliance vibration of endpin, tailpiece and the floor.

8mmφの鉄(棒)のちょっと重いエンドピンでの振動挙動を調べました。先般の10mmφエンドピンとよく似た傾向。エンドピンなしでは当然チェロ胴体全体で振動しますが、ピンを付けるとピンを含めた全身振動にシフトしているかのようです。
Advance Endpin Holderはこれらの乖離の中間状態を実現しているように見えます。

Device : Vibration meter VB-8205SD
Cello  : 110-year-old German cello
Endpin : 8mm(D) iron alloy rod, 28cm(11in) below tailpin
Data   : 10 data by pizzicato were averaged at each measurement point

81..Advanced Endpin Holder Developer Notes

[ 01/20/2018 ]     Labels:  81.Solution & Study1

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