Development Of A Measurement System Of Brake Glide Distance Of Crane Based On Dynamics-Model And MEMS

As an important shipping equipment, crane is widely used in ports, factories, metallurgy and other places, and plays an important role in the national economy. Crane braking performance affect their security and reliability directly. As one of parameters of braking performance, brake glide distance is the key to guarantee the safe operation of the crane. Aiming at the problem that brake glide distance is difficult to be detected, a detecting Brake glide distance system (DBGDS) based on modeling of load system and MEMS is developed in this paper.A nonlinear two-dimensional dynamic mathematical model of hoist system using the Lagrange Equation is designed and implemented. Crane braking process is analyzed through the simulation, the results showed that the established model can obtain the brake glide distance and deflection angle effectively.The hardware platform of detecting motion parameters system is composed of the MSP430 minimum system, motion parameter acquisition module, communication module and the solar charging module. And the acceleration, angular velocity and magnetic field signal are obtained with MEMS sensor in the data acquisition module. The upper machine is communicated with the lower machine and the serial port communication and network communication are included in the communication module. And the solar panel is used for lithium battery charging scheme.The DBGDS's software is composed of the upper machine and the lower machine software. The communication management, data acquisition and system initialization are included to realize the transmission from the sensor to the PC. And the TCP communication, interface management and data storage are included. And the kalman filter is used to preprocess the acceleration signal to filter out the random noise component of acceleration sensor, and the complementary filter is used to fuse the three kinds of data from MEMS sensor to improve the measurement precision and dynamic performance of the system.Finally, the experimental platform of crane hoisting system is built based on the design of hardware and software platform. From the collection of the stationary, lifting, braking condition of the experimental data, the changing trend in conformity with the actual motion is obtained and the accuracy of the developed software and hardware platform are showed. The braking process of mathematical model and experiment data are analyzed based on the virtual instrument platform and the correctness of the theoretical research is verified.