Manually adjust the piano volume

The volume is proportional to the velocity of the felt hammer. Fundamentally speaking, the volume depends on the dynamic energy that causes the movement of the keys. Dynamic energy is proportional to the square of the amount of exercise and speed, so either increasing the amount of exercise or increasing the speed of exercise can enhance dynamic energy. Let's take a closer look.

When translated into "piano" language, the sound can be enhanced in two ways.

1. We increase the amount of exercise, that is, let the forearm or hand wave, not the finger.

2. We improve the speed of actively waving organs, that is, playing faster and more powerfully.

However, there is a problem here, that is, under what conditions can we make maximum use of the energy of actively waving organs to pronounce.

When the network is disconnected, the speed of pressing the button should be the highest, because after the network is disconnected, the button has lost contact with the felt hammer, that is, the button can no longer control the speed of the felt hammer, so it can no longer control the sound played. Only the kinetic energy applied to the keys before disconnection can be converted into sound. The speed of actively waving organs can also change during the same performance: accelerate to the limit at the beginning and then slow down.

In this way, the maximum volume to be achieved by waving can only be obtained when our waving organs reach the highest speed, that is, at the moment when they are just disconnected. Of course, when the keys are not touched, the keys will suddenly become obstacles to the acceleration of waving organs. Nevertheless, the maximum energy can still be generated at the moment when the organ is actively waved at the highest speed before it is blocked. If this is not achieved, the speed of the felt hammer will be relatively small. The practical significance of all the above is that when playing with the same strength, the movement axis of fingers, that is, the distance from the whole hand to the keyboard is different, and the volume obtained is also different.

The closer the axis of finger movement is, the stronger the volume will be, but this is only limited to the coincidence of the highest speed of finger and the breaking point. If you get too close, the volume will also decrease, so that no matter how the pianist throws or squeezes the keys, the piano will not make a stronger sound, but will only enhance the unpleasant overtones below.

The most important way to adjust the volume is to move the active axis closer or farther. This can be achieved by using different impact forces, so the adjustment of impact force and weight effect are also meaningful for the difference of display intensity.