Research On Vibration Checkout Gear Of Marine Propulsion Shafting

The vibration test of the marine propulsion shafting is an important part of Ship detection. The design proposal of the marine propulsion shafting wins approval only if the testing of vibration satisfies the requirements.This paper introduces the research significance of vibration testing device, and the domestic and international researches and development condition. Besides, it discusses the knowledge of single freedom system and two free-dimensions. On the basis of theoretical knowledge of the shaft model simplified calculation, get the shaft is calculated parameters such as stiffness and damping, etc. The theoretical calculations tend to biggish error with the actual measurement, necessary data for correction. This paper also introduces the technique of measurement of torsional vibration and whirling vibration of shafting, the selection of sensor and the type of vibrator. Then the paper concretely studies design of hardware and software in the vibration detector. The technique of measurement on vibration consists of the principle of signal collection, preprocessing methods of the signal, A/D conversion technology, and the common methods of signal analysis and processing.In the design of the vibration system, we take PC as main controller, through a serial port, and then send commands to RAM information monitoring the single chip microprocessor carries on corresponding operation according to the interface. The data sampling program of torsional vibration longitudinal vibration and whirling vibration of shafting has been ingrained into single chip. The single chips control the CPLD to process data, which will save hours of hardware resources and circuit delay. The system use photoelectric encoder and eddy current transducer to realize the collection of the signal of torsional vibration and the signal of cyclotron real-time and accurately respectively. Vast amounts of data file can be stored by FLASH. High-speed data transmission between microcontroller and PC can be realized by USB interfaces. This paper completed a simulation of torsion vibration test and tensional vibration incentive project design.