Under-ship-movement trigger signal self-trigger device for ship stern flow field PIV measurement in waves and measurement method

Abstract

The invention provides an under-ship-movement trigger signal self-trigger device for ship stern flow field PIV measurement in waves and a measurement method. The under-ship-movement trigger signal self-trigger device comprises a PIV data acquisition and signal conditioning computer, a laser sensor, a PIV measurement system, a laser signal receiving and signal triggering mark plate, a signal synchronizer, a ship model movement sinking-merging rod and a pitch angle shaft encoder, wherein the pitch angle shaft encoder is arranged on a ship model, the ship model movement sinking-merging rod is arranged above the pitch angle shaft encoder, and the laser signal receiving and signal triggering mark plate is arranged on the ship model movement sinking-merging rod. When laser light signals transmitted by the laser sensor pass through a silver mark line on the mark plate, a signal trigger access is formed, trigger signals are sent to the synchronizer, the synchronizer receives signals sent during pitch movements and sinking-merging movements and triggers the PIV flow field measurement system, and the PIV flow field measurement system begins to work and acquires pictures. The under-ship-movement trigger signal self-trigger device is used for avoiding the problem that man-made signal trigger and interference and movement positions are desynchronized with measurement positions.

Description

technical field [0001] The invention relates to a ship motion self-triggering device and a measurement method for a trigger signal for PIV measurement of a ship's wake field in waves, and belongs to the field of ship test flow field measurement. Background technique [0002] During the ship design process, it is very important to study the attitude and performance of the ship in waves. In order to study the propulsion performance of a ship in waves, it is necessary to measure the velocity of the flow field on the propeller disk when the ship sails in waves. Pitot tube, LDV (single-point velocimetry) and PIV (particle image velocimetry) are three commonly used methods for measuring and obtaining detailed flow fields. With the development of laser and image processing technology, LDV and PIV have gradually replaced the treatment The flow field has pitot tubes in contact with the disturbance. Compared with the single-point measurement of LDV, PIV has been widely used by a lar...

AI Technical Summary

Problems solved by technology

The vehicle-mounted PIV system is also widely used to measure the flow field of the ship model sailing in the towed pool. However, the traditional vehicle-mounted PIV system cannot be used to measure the flow field change of the ship model under the action of waves.

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