Development of an experimental setup for a ship's propeller shaft vibrations study

The results of the design and construction of an experimental installation for studying transverse, torsional, axial and related vibrations of a ship's shaft line are presented. The analysis of publications devoted to the research of dynamic phenomena accompanying the operation of the propulsive complex is carried out. It is noted that in order to increase the accuracy of calculation methods and experimental data, the mechanical vibrations of the shafts must be considered as combinations, i.e., not isolated. The design of an experimental installation is described, the operation of which is close to the real operating conditions of the shaft pipeline. The general principles of experiments that can be carried out when using individual components of the device are given. The operation of the installation components determines the list and range of experimental factors. The results of work on assessing the operability of the constructed installation by sequentially switching on components and evaluating their effect on the stress-strain state of the shaft pipeline are presented. The vibration parameters were recorded by strain gauge measuring equipment mounted on the shaft surface. The measurement results are presented in the form of tensograms of transverse, torsional and axial vibrations of the shaft. The analysis of experimental data revealed the presence of separate zones of dynamic instability when the corresponding components of the installation are switched on. Boundaries are defined for each dynamic instability zone and normal and tangential mechanical stresses are estimated. The design of the installation makes it possible to increase the accuracy of studies of both individual types of vibrations of the ship's shaft line and their combinations by increasing the accuracy of simulating the operation of the shaft line in real operating conditions. The main area of scientific research that will be conducted on this device is devoted to solving theoretical and experimental problems of improving the reliability of marine power plants.