System for performing mechanical and shafting vibration measurements on ship propeller models

Abstract

The invention discloses a system for executing mechanical and shafting vibration measurement of a ship thruster model. The system comprises a connecting wall, a magnetic disc type coupler, a first transmission shaft and a second transmission shaft, wherein the connecting wall is of a vertical cabin wall structure and is mounted between a propeller and a driving motor; the magnetic disc type coupler consists of two magnetic discs which are mutually and oppositely arranged and are respectively mounted at the left side and the right side of the connecting wall; the two transmission shafts are respectively arranged at both sides of a connecting shaft and are used for respectively connecting the driving motor and the propeller with the magnetic disc type coupler; besides, a power driver is arranged at the shaft end, which is positioned at one side of the connecting wall, of the second transmission shaft, and a velocity sensor is mounted on the middle connecting wall. Through adoption of the system, the motor, the propeller and measuring elements can be thoroughly separated from the connection, the adverse effect generated by the vibration of the motor on the process of the measurement is avoided, at the same time, the precision and the reliability of the measurement are obviously improved, and the watertight link of the measurement system becomes easier.

Description

technical field [0001] The invention belongs to the technical field of ship component detection, and more particularly relates to a system for performing mechanical and shafting vibration measurement on a ship propeller model. Background technique [0002] For surface and underwater vehicles such as ships, when their propellers operate in an uneven flow field, they will generate force pulsations and vibrations, which will cause the vibration of the stern of the vehicle and generate radiated noise from the vehicle, which will affect the navigation. An important factor in the stealth performance of the device. Therefore, when carrying out model tests, researchers need to measure the force and shafting vibration characteristics of the model aircraft propeller, as an important reference factor to measure the hydrodynamic performance of the ship. [0003] see figure 1 , in the prior art, the currently widely used propeller model mechanics and shafting vibration characteristics ...

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Problems solved by technology

[0004] However, further studies have shown that the above-mentioned prior art still has the following defects or deficiencies: First, the measurement system has high requirements on the axial coaxiality of the components, resulting in difficulties in installation and debugging, and due to the pre-tightening force left, It is easy to have a great impact on the follow-up measurement accuracy. In addition, the existence of the pre-tightening force will also make the working life of the long shaft drop sharply; The vibrations generated by the model pulse force are mixed together, which greatly deteriorates the accuracy and reliability of the measurement results. Satisfactory measurement results could not be obtained; again, since the long axis was connected between the propeller and the drive motor as a complete shaft, it was difficult to implement waterproof protection inside the propeller model, making the dynamic seal prone to water leakage during the measurement process, This in turn leads to damage to the drive motor and the model; finally, because this type of measurement system performs the measurement of the thrust and pulse conditions of the shaft system symmetrically on the side of the shaft, it is found that the measurement accuracy is prone to decline in actual tests

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