【正文】
s Day. More and more young Chinese people begin to celebrate this day in a very similar way as that in western countries. Fewer people than ever will gaze at the heavens on Saturday to pick out the two stars shining bright on either side of the Milky Way, that is, if people even know on which day Qixi falls. There are ready reminders dotted about, in the form of big ads saying Sales on Chinese Valentine39。 Festival. In this day, girls will throw a sewing needle into a bowl full of water on the night of Qixi as a test of embroidery skills. If the needle floats on top of the water instead of sinking, it proves the girl is a skilled embroiders. Single women also pray for finding a good husband in the future. And the newly married women pray to bee pregnant quickly. Tradition transformed The love story of Niulang and Zhinu, and the Qixi Festival have been handed down for generations. Yet these ancient traditions and customs are slowly dying out. Many modern Chinese, particularly youngsters, seem to know more about St Valentine39。s time for the wild fruits to ripe. The picturesque Arxan in Autumn is indeed a fairyland only exists in a dream that satisfies all your fantasies. If it rains heavily on Saturday night, some elderly Chinese will say it is because Zhinu, or the Weaving Maid, is crying on the day she met her husband Niulang, or the Cowherd, on the Milky Way. Most Chinese remember being told this romantic tragedy when they were children on Qixi, or the Seventh Night Festival, which falls on the seventh day of the seventh lunar month, which is usually in early August. This year it falls on Saturday, August 2. Folklore Story As the story goes, once there was a cowherd, Niulang, who lived with his elder brother and sisterinlaw. But she disliked and abused him, and the boy was forced to leave home with only an old cow for pany. The cow, however, was a former god who had violated imperial rules and was sent to earth in bovine form. One day the cow led Niulang to a lake where fairies took a bath on earth. Among them was Zhinu, the most beautiful fairy and a skilled seamstress. The two fell in love at first sight and were soon married. They had a son and daughter and their happy life was held up as an example for hundreds of years in China. Yet in the eyes of the Jade Emperor, the Supreme Deity in Taoism, marriage between a mortal and fairy was strictly forbidden. He ordered the heaven troop to catch Zhinu back. Niulang grew desperate when he discovered Zhinu had been taken back to heaven. Driven by Niulang39。 ll wait in the line for one hour to get a ticket, and another two hours at the site, to only see a tiny bit of the place due to the crowds. Last year, 428 million tourists traveled in China over the weeklong holiday in October. Traveling during this period is a matter that needs thorough preparation. If you are short on time to plan the uping Golden Week it may not be a bad idea to avoid some of the most crowded places for now. There is always a place so fascinating that everyone yearns for. Arxan is a place like this. The beauty of Arxan is everlasting regardless of the changing of four seasons. Bestowed by nature, its spectacular seasonal landscape and mountains are just beyond word. Arxan is a crucial destination for the remended travelling route, China Inner Mongolia Arxan — Hailar — Manzhouli. It is also the joint of the four prairies across the SinoMongolian border, where people gravitate towards the exotic atmosphere mixed with Chinese, Russian, and Mongolia elements. As a historic site for the Yitian Battle, Arxan still embodies the spirit of Genghis Khan. Walking into Arxan, you will be amazed by a kaleidoscope of geous colors all the year round the Spring azaleas blooming red in the snow, the Summer sea wavering blue in the breeze, the Autumn leaves painted in yellow covering volcanic traces, and the Winter woods shining white on the vast alpine snowscape. Hinggan League Arxan city is situated in the far eastern area of Inner Mongolia Autonomous Region. Its full name Haren Arxan means hot holy water in the Mongolian language. Arxan is a tourism city in the northern frontier with a blend of large forest, grand prairies, vast snowfield, heaven lake cluster, thermium, as well as volcanic cluster. It is a rare and unique ecotourism base filled with healthy sunshine, clean air and unspoiled green. Nestled close to the country39。由于我的學術水平有限,所寫論文難免有不足之處,懇請各位老師和學友批評和指正!感謝張雷老師。本文引用了數(shù)位學者的研究文獻,如果沒有各位學者的研究成果的幫助和啟發(fā),我將很難完成本篇論文的寫作。另外,在校圖書館查找資料的時候,圖書館的老師也給我提供了很多方面的支持與幫助。AGV 智能充電站的設計與應用25參考文獻[1] 王永華. 現(xiàn)代電氣控制及 PLC 應用技術. 中國航空航天大學出版社 2022.[2] 莫正康. , 2022.[3] 朱獻清,. 北京:機械工業(yè)出版社,2022.[4] . 北京:電子工業(yè)出版社,2022.[5] 步科公司, ET070 觸摸屏組態(tài)手冊河南機電高等??茖W校畢業(yè)論文26致 謝歷時將近兩周的時間終于將這篇論文寫完,在論文的寫作過程中遇到了無數(shù)的困難和障礙,都在同學和老師的幫助下度過了。(l)蓄電池串聯(lián)均衡充電單個蓄電池的電壓與容量有限,AGV 車用蓄電池是由多個單體電串聯(lián)然后并聯(lián)組成的,充電時各個單體電池間的不一致性會使得蓄電池充電不均衡,這將導致蓄電池組壽命縮短,當前 AGV 車對蓄電池串聯(lián)均衡充電要求不高,且大多蓄電池并沒有相應的單體檢測裝置,故沒有在這方面做深入的研究,只是用小電流充電實現(xiàn)了簡單的均衡充電。其次,研究了蓄電池充電的可接受充電電流曲線,分析了蓄電池的常規(guī)充電方法和快充電方法及充電終止控制方法的優(yōu)缺點,并在此基礎上提出了帶放電極化的三段式可變脈沖智能充電方法,采用三相全控整流電路,能夠安全,快速,高效,無損的實現(xiàn)用于電動汽車的各個種類的蓄電池組的快速充電,并具有故障自診斷功能,最后,重點設計了智能充電機的硬件電路、PLC 控制方式,觸摸屏界面設計等。每隔一定時間周期對每一個蓄電池的電壓、電流、溫度以及整個蓄電池組的電壓進行采樣分析,對三相輸入的電壓、電流值進行周期采樣分析,對 IGBT 的溫度進行周期采樣分析,如果發(fā)現(xiàn)異常,立即調用相應的保護中斷程序,確保電路的安全正常工作。因此,本文中的充電電流設定值、充電電壓閥值以及后面將提到的負脈沖放電寬度,都將隨著充電電池狀態(tài)的不同而改變,從而使充電機根據(jù)電池的荷電狀態(tài)采取不同的智能充電技術,達到智能化充電的效果。此時,將電池組的初始狀態(tài)參數(shù)與設定的充電電壓和電流曲線進行比較,得到合適的充電點,并將此時的充電電壓和電流值反饋到控制器中,進行分析處理,算出合適的移相控制角 a,進而輸出合適的 PWM 波形控制 IGBT 的關斷,從而得到需要的充電電壓值和電流值。此時,如果電池組初始電壓電流參數(shù)值小于涓流充電設定的門限值,則在一定延時后進入涓流充電狀態(tài),對電池組進行小電流涓流充電直至達到快速充電狀態(tài)。首先,檢測電池組的初始狀態(tài),包括初始電壓 U0。然后進行電池檢測,檢測蓄電池組是否連接正確,如果檢測發(fā)現(xiàn)無蓄電池或者蓄電池連接不正確,則提示“請接入或正確連接電池組” ,并重新連接。系統(tǒng)通電以后,首先進行系統(tǒng)的初始化。VW912 值為1 時為時間到、VW912 值為 2 時為人工停。其中電流到跟電壓到是同一道理。均可根據(jù)二階段充電曲線來設定。例如容量偏低的電池容易出現(xiàn)過充電,并使電池不一致性擴大,這就加劇了電池組中容量低的電池過充電現(xiàn)象,造成個別電池性能迅速下降而過早報廢,從而影響整個電池組的使用性能,降低了電動汽車的動力性和經(jīng)濟性。動力