关键词: 船舶动力装置, 位姿测量, 对中监测, 复合迭代算法

Abstract: In order to grasp the alignment status of diesel power plants in real time, a monitoring system was designed based on position sensitive detectors. Firstly, a measurement method for position and posture was proposed based on position sensitive detectors, and a nonlinear equation group incorporating position and posture was formed. By means of position and posture transformation, the alignment deviation and opening angle changes were obtained. Secondly, high-precision measurement of the constants in the equation group was achieved through the sensor bracket components. Through hardware and software design, a measurement system was formed. A composite iterative algorithm was designed to ensure fast and accurate solution of the equations based on simple Newtons method. Finally, the accuracy of the measurement system was analyzed and validated using a four-dimensional platform. The experimental results show that the monitoring system has low noise, with a deviation noise of less than 0.005 mm and an angle noise of less than 0.01°. The accuracy is greatly affected by the incident direction of the laser, with a maximum deviation measurement errors isless than 0.02 mm and a maximum opening angle measurement errors is less than of 0.019° under the best incident direction. This system will be used for monitoring the alignment status of domestic diesel power plants.

Key words: marine power plant, position and posture measurement, misalignment monitor, compound iterative algorithm