回复 7# 倏逝
Understanding what determines string tension.
In order to determine the tension at which a string will vibrate, you need three pieces of
information: the Unit Weight, the Scale Length, and the Frequency of the string. You can use
the charts in this brochure to get a pre-calculated tension for the D’Addario strings listed or
you can use the formulas below to calculate the exact tension for any string using the scale
length of your particular instrument. All of the charts illustrate string tensions for each
string at a variety of pitches, in case you use alternative tunings.
UW- Unit Weight. In all the charts and formulas in the brochure, unit weight is
expressed in pounds per linear inch (lb/in).
L- Scale Length. This is the vibrating length of the string. This is determined by
measuring the distance from the nut to the bridge of the instrument in inches (in).
F- Frequency or pitch. This is the pitch at which you will be tuning the string
expressed in cycles per second (Hertz).
On the following page are two fingerboard graphics detailing the various
frequencies for the standard guitar and electric bass guitar.
To calculate the tension of a string in pounds use the formula below,
inserting the three variables described above:
T (Tension) = (UW x (2 x L x F)^2) / 386.4
To convert the result into Newtons, simply multiply by 4.45.
If you know what tension you want the string to have, you can calculate the string
unit weight. You can then use the charts in this guide to locate a string with
approximately the same desired unit weight.
UW (unit weight) = (T x 386.4) / (2 x L x F)^2