Why does the music fountain oscillate with the music
Music fountain is a combination of water or other liquids that are sprayed through a nozzle under a certain pressure and have a specific shape. Nowadays, fountains are generally artificial landscape fountains relying on fountain equipment. Mainly through the control of frequency converter to achieve rhythm and rhythm, music fountain water changes abundantly, with lighting to give people a real and intuitive aesthetic feeling.
The various swings in the music fountain can make people feel the soft beauty of the fountain. The radial swing is caused by the swing mechanism under the water surface, which makes the water scenery beautiful, pleasant to the eye and gives people a magical feeling. It is the performance of the high-tech development of the times.
The change of the position and speed of the swaying fountain is an important factor to produce the swaying water style. The position sensor of the fountain swing mechanism should be a waterproof non-contact positioning device. Hall sensors induced by magnets, optoelectronic sensors guided by optical fibers or rotary position encoders attracted by magnets are often used. For example, the positioning device of the fountain swing mechanism using position coder includes position coder mounted on the swing motor shaft, high-speed counter, control computer and communication interface.
Because the connecting rod of the swing mechanism usually has large clearance, in order to achieve positioning, the swing mechanism can only reach the positioning point from one direction, so that its repetition accuracy can be achieved. Therefore, when the swing mechanism needs to stop, it must reach the positioning point from one direction at a time.
The positioning accuracy of the swing mechanism is affected by the motion moment and resistance moment. Motion moment is determined by the power supply voltage of the motor and the motion speed before stopping, while resistance moment is composed of the friction force of the swing mechanism, the speed of water flow and the wind force around it. Obviously, these are factors that cannot be determined in advance.
Therefore, in order to achieve the goal of positioning, we need to change its control parameters every time. There are generally two control parameters for positioning by motor energy consumption braking, the magnitude of DC braking current and start-up braking time. The more convenient way to control the computer is to change the braking time.
In the control system, the braking time of the motor can be corrected by the deviation of the detected position. According to the statistic data of the positioning deviation value of the swing mechanism, the braking time is determined by calculating the mathematical model.
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