本文選題：支撐軸力 + MPPT控制器　； 參考：《西南科技大學(xué)》2016年碩士論文

【摘要】：隨著我國城市化規(guī)模的發(fā)展,城市地鐵也進(jìn)入了一個(gè)蓬勃發(fā)展的階段,地鐵深基坑工程建設(shè)也日益增多。在深基坑施工過程中,其圍護(hù)結(jié)構(gòu)的穩(wěn)定性就顯得極其重要。地鐵冠梁支撐軸力作為評價(jià)基坑圍護(hù)結(jié)構(gòu)健康的主要參數(shù),對其進(jìn)行監(jiān)測是確保支撐受力不超過構(gòu)件承載力,保證基坑安全的重要方法。我國支撐軸力監(jiān)測應(yīng)用時(shí)間并不長,在目前對其監(jiān)測主要存在監(jiān)測自動(dòng)化水平低、監(jiān)測軸力受溫度及環(huán)境影響比設(shè)計(jì)值偏大等問題。針對以上問題,本文在已有的研究和設(shè)計(jì)成果的基礎(chǔ)上,依托成都地鐵4號線二期工程,以地鐵冠梁支撐軸力為研究對象,對軸力監(jiān)測系統(tǒng)進(jìn)行了整體設(shè)計(jì),并詳細(xì)研究了系統(tǒng)供電方式及數(shù)據(jù)管理系統(tǒng)的設(shè)計(jì),同時(shí)結(jié)合支撐軸力影響因素對監(jiān)測軸力值進(jìn)行分析研究。主要工作如下:首先,針對地鐵施工現(xiàn)場供電環(huán)境的復(fù)雜性及安全性,設(shè)計(jì)了一種太陽能最大功率點(diǎn)跟蹤(MPPT)控制器,主要基于改進(jìn)的電壓擾動(dòng)觀察法獲得太陽能電池板的最大功率穩(wěn)定輸出。實(shí)驗(yàn)證明了該太陽能控制器的跟蹤效率可達(dá)到95%以上,相比無MPPT控制器的跟蹤效率提高了19%,并具有體積小、成本低、可靠性高等優(yōu)點(diǎn),已成功運(yùn)用在本監(jiān)測系統(tǒng)中,提高了監(jiān)測系統(tǒng)的長效性。其次,采用QT作為開發(fā)平臺(tái)設(shè)計(jì)了遠(yuǎn)程數(shù)據(jù)管理軟件�；贕SM網(wǎng)絡(luò)實(shí)現(xiàn)了穩(wěn)定的數(shù)據(jù)傳輸,然后建立數(shù)據(jù)解析及數(shù)據(jù)顯示模塊;同時(shí)基于My SQL平臺(tái),建立監(jiān)測數(shù)據(jù)庫平臺(tái),最終實(shí)現(xiàn)了系統(tǒng)通信控制、監(jiān)測站點(diǎn)管理、數(shù)據(jù)分析處理、數(shù)據(jù)庫維護(hù)等功能。最后,結(jié)合支撐軸力影響因素對監(jiān)測數(shù)據(jù)進(jìn)行分析,對支撐軸力監(jiān)測值進(jìn)行了溫度修正,溫度修正后的支撐軸力減少了近20%,有效去除了因溫度變化造成支撐軸力監(jiān)測值偏大的現(xiàn)象。同時(shí)采用標(biāo)準(zhǔn)卡爾曼濾波算法與自適應(yīng)卡爾曼濾波算法對支撐軸力進(jìn)行對比預(yù)測,結(jié)果表明方差自適應(yīng)卡爾曼濾波結(jié)果絕對誤差均小于12%,更接近實(shí)測值,在混凝土支撐軸力預(yù)測技術(shù)上也具有一定的理論指導(dǎo)意義。
[Abstract]:With the development of urbanization in our country, urban subway has entered a stage of vigorous development, and the construction of subway deep foundation pit is increasing day by day. In the process of deep foundation pit construction, the stability of enclosure structure is very important. The supporting axial force of crown beam of subway is the main parameter to evaluate the health of foundation pit enclosure. Monitoring it is an important method to ensure the bearing capacity of supporting member and the safety of foundation pit. The application time of supporting axial force monitoring in our country is not long. At present, the monitoring automation level is low, the monitoring axial force is influenced by temperature and environment than the design value, and so on. In view of the above problems, based on the existing research and design results, this paper, relying on the second phase of Chengdu Metro Line 4, and taking the axial force of the crown beam as the research object, has carried out the overall design of the axial force monitoring system. The design of the power supply system and the data management system are studied in detail. At the same time, the value of the monitoring axial force is analyzed and studied in combination with the influence factors of the supporting axial force. The main work is as follows: firstly, a solar maximum power point tracking (MPPT) controller is designed for the complexity and security of power supply environment in subway construction site. The maximum power stable output of solar panel is obtained based on the improved voltage disturbance observation method. The experimental results show that the tracking efficiency of the solar controller can reach more than 95%. Compared with the MPPT controller, the tracking efficiency is improved by 19%, and has the advantages of small volume, low cost and high reliability. It has been successfully applied in this monitoring system. The long-term effectiveness of the monitoring system is improved. Secondly, the remote data management software is designed using QT as the development platform. Based on GSM network, the stable data transmission is realized, and then the module of data analysis and data display is established. At the same time, based on my SQL platform, the monitoring database platform is established. Finally, the system communication control, monitoring site management, data analysis and processing are realized. Database maintenance and other functions. Finally, according to the influence factors of supporting axial force, the monitoring data are analyzed, and the temperature correction of the monitoring value of bracing axial force is carried out. The temperature correction reduces the axial force of the support by nearly 20 parts, and effectively removes the phenomenon that the monitoring value of the support axial force is too large due to the change of temperature. At the same time, the standard Kalman filter algorithm and the adaptive Kalman filter algorithm are used to predict the support axial force. The results show that the absolute error of the variance adaptive Kalman filter is less than 12, which is closer to the measured value. It is also of theoretical significance in predicting the axial force of concrete braces.
【學(xué)位授予單位】：西南科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：U231.3;TP274

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