[ 06/29/2017 ] Labels: 81.Solution & Study1
A 2mmD x 500mmL steel rod behaves like as a string and also an endpin.
(2mmDx500mmLの細い鉄棒、その動きは弦のようでもあり、太いエンドピンのようでもあり、観察に利用できそうです。)
81.. 2mmD steel rod -bowed and plucked-
70d. The mechanical resonance of cello
[ 06/06/2017 ] Labels: 95.Video & Study1
- Effect of rebounded vibration from floor
- Flattened vibration beats
- Whole length slow swing
- Vibration center shifting
(床置きしてエンドピン先端の振動を止めることによる影響：
床からのリバウンド、響きの平坦化、全身振動、胴体振動の中心変化)
20. Vibration of C string (arco, on floor, 32 times slower)
[ 04/26/2017 ] Labels: 20.Vibration-Video
When appropriate pressure and speed applied into a bow, the C string takes a pure C vibration( of 1 beat, 66Hz, cycle=15.2ms) from the beginning accompanied with tiny fluctuation.
In this case, the fingerboard also takes 1 beat synchronized, and the G string widely resonates too.
Be noticed, G string's vibration is not of a 'G' but a 'C', because it is just synchronizing to 66Hz(15.2ms) probably taking 4-beat.
If G string can create a real sound by itself, it is presumed as a C 263Hz(= 2 octave above) sound.
We can find such mechanical resonances here and there on our cello.
C note (66 Hz, open)
Cello: 110-year-old German cello
Strings : Evah pirazzi Weich
with steel pipe endpin on the floor
32 times slower
C線を丁寧に演奏すると、C弦は最初から１ビートの純粋な(Cの)振動をします。この場合、テールピースも１ビートで共振し、G線はGの振動でなく４ビートのC音(=２オクターブ上のC)で共振しているのがわかります。
20. Vibration of C string (arco, on stand -floating-, 32 times slower)
[ 04/26/2017 ] Labels: 20.Vibration-Video
50. A(221Hz) Endpin-tip vibration data
[ 04/08/2017 ] Labels: 48..Beat.Endpin
3 sec after a A(221Hz, open string) pizzicato
Cello: 110-year-old German cello
Endpin: 10mm(D) steel pipe, 28cm(11in) below tailpin
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Some data might show weakness in intensity. The reason is unknown but it might caused by low-voltage at battery in contact microphone.
50. G(98Hz) Endpin-tip vibration data
[ 4/04/17 ] Labels: 50.Beat.Endpin
On stand, endpin is floating,
pin-tip takes natural various beats.
Placed on the floor, endpin is fixed in place,
pin-tip keeps homogeneous 3-beat.
On Advanced Endpin Holder,
pin-tip takes a mediate vibration beat pattern between above.
----------------------------------------------
3 sec after a G(98Hz, open string) pizzicato
Cello: 110-year-old German cello
Endpin: 10mm(D) steel pipe, 28cm(11in) below tailpin
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