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Self-adaptive rotating speed measurement system and method on basis of inertial sensor

The invention relates to a self-adaptive rotating speed measurement system on the basis of an inertial sensor and a self-adaptive rotating speed measurement method on the basis of the inertial sensor. The measurement system comprises a rotating speed detector and a display terminal; an accelerometer, a gyroscope, a first microprocessor, a first wireless transmission module and a first power supply battery are arranged in the rotating speed detector; a second wireless transmission module, a second microprocessor, a display and a second power supply battery are arranged in the display terminal; the first wireless transmission module is in wireless connection with the second wireless transmission module; and both a Z axis of the accelerometer and a Z axis of the gyroscope are in parallel to a rotating shaft of a rotating body. According to the invention, functions of the gyroscope and the accelerometer are combined; when the rotating body rotates at a low speed, the system self-adaptively calculates the rotating radius of the rotating body according to an output of the gyroscope and simultaneously outputs a rotating speed; and when the rotating body rotates at a high speed, the system self-adaptively calculates, processes and outputs a high rotating speed by combining a low-speed calculating result according to a centripetal acceleration output by the accelerometer.