A ship shafting torsional vibration testing device

Abstract

The invention provides a test device for ship shafting torsional vibration. The test device comprises a torsional vibration sensing member which is disposed on a shaft surface of a to-be-tested shafting component and is used for perceiving and transmitting torsional vibration of the to-be-tested shafting component; the torsional vibration sensing member includes a belt drum and an encoder disposedon the belt drum; an output shaft of the belt drum is fixed with the encoder; the belt drum is in transmission connection with the to-be-tested shafting component through a belt; an output end of theencoder is connected to a signal collection instrument; the signal collection instrument is connected to a signal collection computer; the test device further comprises a supporting mechanism for fixing the to-be-tested shafting component; the supporting mechanism includes a supporting base, a clamping subassembly and a transmission sliding block. The to-be-tested shafting component is stably supported in a test process, thus the operation is convenient and the test accuracy is improved.

Description

technical field [0001] The invention relates to a testing device, in particular to a testing device for torsional vibration of a ship shaft system. Background technique [0002] Ship shafting vibration includes torsional vibration (referred to as torsional vibration), transverse vibration and longitudinal vibration. It is an important vibration index for evaluating the performance of ship shafting, and it is also one of the important evaluation bases for the safe operation of the ship's main propulsion system. Existing ship shafting torsional vibration tests generally use Hall digital tooth sensors to collect periodic pulse signals of flywheel end gears, thereby realizing the collection of shafting torsional vibration signals. There are three problems in this method: (1) The installation position is limited, it is limited to the position of the flywheel, and the positional relationship between the sensor and the tooth surface of the gear is vertical, and the installation gap...

AI Technical Summary

Problems solved by technology

There are three problems in this method: (1) The installation position is limited, it is limited to the position of the flywheel, and the positional relationship between the sensor and the tooth surface of the gear is vertical, and the installation gap is 1-3mm; (2) It is not easy to obtain the number of teeth. The number of teeth is a necessary parameter for the torsional vibration test of the shaft system. Before the measurement, it is necessary to mark the gear and turn the main engine for at least one turn to obtain the number of teeth; (3) The measurement accuracy is not fixed, because the collected shaft The torsional vibration signal of the system is converted by gear pulses, so its test accuracy is related to structural parameters such as gear structure, modulus, and number of teeth, and even the test results may not be credible due to the low accuracy

[0005] The above-mentioned test device cannot effectively support and fix the shafting, thus affecting the final test results

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