The Engine Hammer Of Piano
Jan. 07, 2020
The scientific name of the hammer is a string hammer, which is composed of special felt, core felt, mallet claw and hammer nail. It is a string hitting member wrapped with a special felt that is thick in the middle and thin at the ends. Polishing Felt Supplier shares with you.
The hammer consists of two parts, one is a wooden wedge and the other is a felt. Wedges are made of hardwood, mostly maple and walnut.
The piano sound is produced by striking the strings with a hammer, causing the strings to vibrate, and transmitting the vibration energy to the soundboard through the string code. The vibration of the soundboard generates dense waves in the air. Make the sound of the piano we hear. Studies have shown that 50% of the acoustic quality of a piano is determined by the sound source, 25% is determined by the hammer, and the other 25% is determined by other factors. It can be seen that the hammer is a very important factor that affects the sound of the piano. Together with the string and soundboard, it determines the sound quality of the piano.
How the hammer works
The first step is to start with the movement of the hammer. The hammer must have a certain quality and a certain speed, and strike at a certain point of the string with a certain vibration frequency; then leave the string at a certain speed and return to the original position, so that the string can vibrate freely.
When a hammer strikes a string, it transfers some energy to the string. Therefore, the more energy the hammer passes to the string, the better the pronunciation and the louder the sound. Obviously, the timbre is largely determined by the quality and hardness of the hammer.
During normal movement of the hammer, the greater the mass of the hammer, the greater the energy obtained by the string, and the greater the volume of the sound generated by the vibration of the string. However, if the mass of the hammer is too large, the mechanical inertia resistance of the keyboard will be increased. To move a relatively heavy hammer, it will consume a large amount of force and affect the playing feel. When playing the piano, you will feel that the keys are heavy and laborious, and it will also cause the hammer to strike the string for a longer period of time, suppressing part of the string vibration, and making the loudness insufficient to cause the sound to deteriorate.
If the mass of the hammer is too small, the vibrating state will be poor (mainly the string amplitude is too small) due to insufficient energy obtained from the string when the string is struck, which will affect the volume. In the piano strings, because the bass strings are thick and long, if you want to make it have a good vibration state, you need to get relatively large excitation energy. As mentioned above, properly increasing the hammer mass is a better way to solve this problem. The treble strings are thin and short. To make them vibrate better, a hammer with a smaller mass is more suitable.
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