| Diesel monorail crane is an auxiliary transportation equipment used for the transportation of equipment,personnel,and materials in tunnels.It has the characteristics of strong transportation capacity,good flexibility,and high reliability.The braking of monorail cranes mainly relies on the friction between the brake pads and the track,which leads to severe wear of the brake pads during braking,reducing the service life of the brake pads and causing huge energy waste.Therefore,conducting research on the regenerative braking system of diesel monorail cranes is of great significance in reducing brake pad wear and reducing braking energy consumption.This article takes the DLZ110 F four-wheel drive monorail crane as the research object,designs a braking energy recovery and release system,and studies the recovery and release characteristics,braking control strategies.The specific work content is as follows:Firstly,the composition and working principle of the hydraulic system of the driving part of the diesel monorail crane were introduced.Based on this,a braking energy recovery system was designed and selected for calculation.A mathematical model and MATLAB/Simulink simulation model of the energy recovery hydraulic system were constructed.The dynamic characteristics of the energy recovery system under different parameters such as load,initial speed,slope,and accumulator volume of the monorail crane were analyzed;Secondly,a hydraulic system for braking energy release of monorail cranes was designed,and energy release control valves were selected.A mathematical model and MATLAB/Simulink simulation model for the energy release system were constructed.The influence of changes in accumulator parameters(volume,initial pressure)and operating conditions of monorail cranes(load,slope,clamping force)on braking energy release performance was studied;Subsequently,three energy recovery control strategies,namely increasing the initial pressure of the accumulator,constant mechanical assisted braking,and variable mechanical braking,were designed.The recovery performance of the recovery system and the braking performance of the locomotive under different energy recovery strategies were analyzed;Three energy release control strategies,namely constant opening,on-off switching and proportional commutation,are proposed;Based on the proportional directional release strategy,the changes in key system parameters under different energy release modes were analyzed.Finally,a regenerative braking hydraulic system experimental platform was built,and experimental research on the energy recovery system and energy release system was conducted under different parameters such as initial pressure,volume,and single rail crane load,slope,etc.of the energy accumulator;Experimental analysis was conducted on three energy release control strategies: constant opening,on-off switching,and proportional commutation,verifying the effectiveness of the proportional commutation release control strategy.Based on this strategy,the impact of energy release modes on the system was analyzed.This thesis has 71 figures,29 tables and 81 references. |
