Research On Access Vehicle Strategy Optimization And Control System Of Tower Stereo Garage

With the vigorous development of China’s economic and the improvement of the people’s living standards,the number of private cars has increased year by year,especially in big cities with large populations,cars ownership per head is much higher.The continuous increase in the number of cars requires the continuous supply of parking spaces.However,the traditional flat parking lot is more and more difficult to meet the parking demand.Due to the limited land use area of the city,it is very difficult to expand the parking lot.At present,the construction of a stereo garage is an effective way to solve the less parking spaces and difficult parking problems.The stereo garage has high space utilization,and the entire operation process can be controled through PLC,which has high automation and saves a lot of manpower and material resources.However,during the operation process,the neglect of the access policy leads to the customer waiting in line for a long time to obtain the service during the peak service period,which increases the social waiting time.Therefore,optimizing the access process is an important means to improve the efficiency of the stereo garage.In this thesis,takeing tower stereo garage as the research object,adopting simulation technology,the influence of optimization strategy on reducing system service time and customer waiting time,was analyzed considering the dynamic process of operation.And a control system for optimization strategy was designed based on GE-PAC.The main research contents were as follows:(1)Through the literature review and in-depth understanding of the research status of the stereo garage in the access strategy and control system,the research direction of the access strategy optimization,research theory and the design of the control system,were determined.A general mathematical model for analyzing a stereo garage access strategy was established,and the model is more in line with the research object of researching stereo garage access strategy,which provides a reliable theoretical basis for the in-depth study of the access optimization of the stereo garage service process.(2)In this thesis,the embedded Markov chain was chosen to design the dynamic model of customer,and the MATLAB simulation software was used to establish the simulation program of access strategy optimization for simulating the customer arrival situation of the stereo garage in the actual operation process.The genetic algorithm was applied to optimize the service sequence.The effect of optimizing the access strategy during peak hours and nonpeak hours is compared to reduce the service time.(3)The configuration software iFIX and RX3i series controllers of General Electric Company were used to design control system for the tower stereo garage and the proposed optimization strategy.Based on the principle of the designed access optimization,a control program is written for the control system,which realizes the operation of the tower stereo garage access vehicle and the monitoring function of the tower stereo garage operation process.Based on the operation process of the tower stereo garage,the modeling of customer arrival law,optimization strategy modeling and simulation,and the optimization direction and parameter selection for access during the service process are investigated throughly.The works in this thesis provide a theoretical basis for the optimization of access strategy for the stereo garage and have universal applicability and important engineering practical value for the access optimization of large-scale garages.