Trajectory Planning Of Large Propeller Blades Laser Simultaneous Measurement And Software Development

The propeller is the core component of the ship, its manufacturing quality directly affects the performance of the ship's hidden, stability and dynamic performance. In propeller's entire machining cycle, measuring occupies a large proportion. Measurement is a prerequisite for processing, and the accuracy and efficiency of measurement directly affect the machining accuracy and efficiency. With the development of high-precision instruments and equipment, propeller measurement is also moving in the direction of efficient and high-precision measuring development. Excellent measuring technology and measuring equipment improve measuring efficiency and accuracy, at the same time it bring challenges to measurement planning, while the connection between rough positioning based on measuring data with the distribution of allowance is also worth considered.In order to solve the problem of the low efficiency and accuracy of large marine propeller measurement with pitch gauge and caliper, an efficient non-contact synchronous scanning measurement is proposed with the laser displacement sensor. The model of the configuration structure is established according to the mechanical structure of the laser measuring machine and the post-processing solution process is given.According to the structure of laser measuring machine, the synchronization control condition of measurement planning based on the constraints of mechanical structure is analyzed. Combined with the geometry of the propeller, the method of the transition measurement with the parameters is applied, and the motion characteristic of each motion axis of propeller laser measuring machine in transition is analyzed. Finally, the specific examples of different size propellers are given to demonstrate the effectiveness of measurement planning.The allowances of pitch points are calculated based on the measuring points, and drilling trajectory is planned. The relation between allowance and rough registration is analyzed and a new blank registration optimization method is put forward. The matching model of propeller blade surface based on the propeller design parameter tolerance is established. The optimal registration matrix is quickly solved by simulated annealing algorithm for blank to ensure allowances of the propeller blades uniformly distribute. The validity of the drilling trajectory planning method and the effectiveness of algorithm of propeller blades for optimization of registration to automatically adjusting allowances are verified with examples of different propellers.The measuring planning module, drilling planning module and post-processing module of the propeller laser measurement software system are developed. The measuring trajectory can be generated according to different measuring parameters, and measuring NC program can be generated with post-processing module. Measurement motion simulation, collision and interference checking can be achieved. The optimization of blank registration based on measuring data can be complied to ensure allowance of propeller blades distribute uniformly. The drilling trajectory according to the drilling planning parameters can be generated. The structure of propeller laser measuring machine and the details of moving parts can be configured for post-processing, movement simulation, collision and interference checking.