Research On The Integrated Collection Method Of Key Parameters For Ship Propulsion Shafting Operation State Monitoring

The ship’s propulsion shafting is an important part of the ship’s power plant,and it is critical to ensuring the stable and efficient navigation of the ship.Due to the harsh working environment of ship propulsion shafting,accidents frequently occur,and the site is not conducive to the real-time collection of the shafting.Therefore,the prevention of shafting failure is very important.This requires data of the operating status of the shaft system.Mastering the key parameters of the ship’s propulsion shafting operation status can not only effectively avoid shafting failures,but also improve the working efficiency of the shafting.Through the research on the dynamic performance of the ship’s propulsion shafting,the key parameters that can reflect the operating state of the shafting system are summarized as vibration state,functional state and alignment state.Based on the research on the principle of the current parameter testing technology,this paper integrates sensor technology,data communication technology and signal analysis and processing technology to design a set of real-time data collection method for the key parameters of the ship’s propulsion shafting operating state.In terms of hardware design,strain gauges,acceleration sensors,photoelectric speed sensors,etc.are used to collect the original signals,and wireless transmission and collection equipment and wireless receiving base stations are used to achieve wireless transm ission of most parameters.In terms of software design,the method of mixed programming of C# and MATLAB is used to compile the monitoring software.The main functions are signal acquisition,graphic display,analysis and processing,data storage and export,etc.Through the research of signal processing technology,the wavelet threshold denoising technology is used to denoise the original data when the collected parameters are processed;the fast Fourier transform algorithm is used to perform real-time frequency domain conversion and analysis of the original signal;The numerical time-domain integration algorithm for the value,DC component and trend term is integrated,the acceleration signal is integrated into speed and displacement signals;the mathematical model between shaft bending strain and bearing load,shaft torsional strain and torque,and shaft power is established,Calculate bearing load and shaft power based on the shaft strain signal,and perform torsional vibration analysis.Finally,in order to verify the test plan,this paper independently designed a shafting test platform,and built test functions such as a pressure acquisition system,and conducted experimental tests on the shafting test platform to verify the feasibility of the collection plan.