Ship rotary shaft system instantaneous rotational speed measurement device and method

Abstract

The invention discloses a ship rotary shaft system instantaneous rotational speed measurement device and method. The device comprises a magnetic grid, a magnetic read head, a signal preprocessing unit, a signal acquisition unit and a rotational speed calculation unit; the magnetic grid surrounds the surface of a to-be-measured rotary shaft of a ship, and formed round rings are coaxial with the to-be-measured rotary shaft; the magnetic read head is arranged above the magnetic grid, an effective induction face of the magnetic read head faces the magnetic grid and is tangent to the round rings ofthe magnetic grid, and a direction where a long edge of the magnetic read head is positioned should be the same with a rotation direction of the magnetic grid; the signal preprocessing unit is used for converting a magnetic grid pulse signal read by the magnetic read head into a square wave pulse signal; the signal acquisition unit is used for acquiring the magnetic grid square wave signal processed by the signal preprocessing unit and carrying out counting; and the rotational speed calculation unit is used for generating a high-frequency clock signal and combining a magnetic grid square wavepulse number to calculate an instantaneous rotational speed of the to-be-measured rotary shaft. The device disclosed by the invention is convenient to mount, high in reliability, high in rotational speed measurement accuracy and high in frequency.

Description

technical field [0001] The invention relates to the speed measurement of a ship's rotating shaft system, in particular to a device and method for measuring the instantaneous speed of a ship's rotating shaft system. Background technique [0002] The rotating shaft speed of the rotating shaft system is a key parameter of the ship's operating conditions, and it is of great significance to measure the ship's operating state. For example, the rotational speed of the impeller shaft directly affects the speed and course of the ship, while the rotational speed of the main shaft of the ship affects the output power of the main engine. At present, there are mainly three methods for measuring the speed of the ship's rotating shaft system as follows: [0003] The photoelectric encoder measures the speed by placing a multi-division photoelectric encoder on the free end of the shaft to be measured, and using the photoelectric effect to generate a pulse signal to calculate the speed. How...

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Problems solved by technology

[0006] In addition to their respective disadvantages in the measurement of ship shafting, the above three speed measurement methods also have a common disadvantage: no matter through gratings, reflectors or gears, the number of pulse signals that can be generated per revolution is too small to perform high-frequency measurement. , high-precision instantaneous speed measurement

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