Method and system for measuring inversion propeller longitudinal excitation based on shafting longitudinal vibration response

Abstract

The invention provides a method and a system for measuring inversion propeller longitudinal excitation based on shafting longitudinal vibration response, and the method comprises the steps: dividing ashafting into N segments according to a certain standard based on a general structure of a propulsion shafting, building a shafting segmented waveguide model, and obtaining a propeller excitation expression based on the model; for a shaft section with a non-uniform cross section and a non-uniform material, estimating a wave amplitude coefficient by combining a modal method and a waveguide method,namely solving the wave amplitude coefficient according to the vibration response of the measurable shaft section, and recursively obtaining the wave amplitude coefficient of the shaft stern sectionaccording to a wave amplitude coefficient recurrence relationship between the shaft sections; substituting the amplitude coefficient of the shaft stern section into a propeller excitation expression obtained based on the model to obtain the solution of the propeller excitation force. The method can be conveniently used for measuring the torque excitation of the propeller through the torsional vibration of the propulsion shafting.

Description

technical field [0001] The present disclosure relates to the technical field of vibration and noise testing, in particular to a method and system for inverting propeller longitudinal excitation based on shafting longitudinal vibration response measurement. Background technique [0002] When the stern propeller rotates in a spatially inhomogeneous and temporally unsteady flow field, it will receive periodic pulsating force and transmit it to the propulsion shafting. The pulsating force caused by the rotation of the propeller is the propeller excitation, which is an important factor causing the vibration of the propulsion shafting, and even causes damage to the shafting in severe cases, affecting the safety of the hull structure and stealth performance. It can be seen that the study of propeller excitation is an extremely important work. [0003] The inventor found in the research that there are three main methods for researching and analyzing propeller excitation at present:...

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Problems solved by technology

[0008] The purpose of the implementation of this specification is to provide a method for measuring and inverting the propeller longitudinal excitation based on the longitudinal vibration response of the shaft system, which solves the problem that it is difficult to measure the propeller excitation through actual measurement at present, and achieves high measurement accuracy and strong operability

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