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本科畢業(yè)論文-車道被占用對城市道路通行能力的影響-在線瀏覽

2024-07-30 17:40本頁面
  

【正文】 路實際通行能力的變化。 經(jīng)過觀察分析,事故占用二、三車道時,這兩車道上的車輛均被迫改到一車道行駛;當(dāng)事故占用一、二車道時, 這兩車道上的車輛全部變道到三車道。建立下面的變道車輛數(shù) cQ 對道路實際通行能力 cB 的損失量 sQ興義民族師范學(xué)院本科畢業(yè)論文 7 的影響模型。 B 可由公式 ? ? 21 0 11 0 0 0 /B v L L L L U I V? ? ? ? ? ? ?,求出。 由于交通事故完全占用兩條車道,被占用的兩條車道上的車輛必須全部改道,故現(xiàn)在可用變道的車輛數(shù)( 31 21? )代替 ()siQ Q q? , 31 21,分別為交通事故占用二三車道時由三變到一和由二變到一車道的車輛數(shù)目,故 31 21 cL Q Q v t? ? ? ? ? ?( ) (2) cB 的損失量 zLQs L?? (3) 將( 1)、( 2)代入( 3)可得到 3 1 2 1[]() s fCcQ vt tBQVQ ? ? ??( ) 興義民族師范學(xué)院本科畢業(yè)論文 8 上述模型可以很好地刻化道路通行能力的損失量的變化情況,進(jìn)而刻畫出道路實際通行能力的變化情況。通過對視頻一和視頻二的變道車輛數(shù)目進(jìn)行統(tǒng)計如表 2 表 2 兩段視頻車流量的統(tǒng)計表 變道 合計 31 1 6 0 5 4 6 4 4 0 4 3 3 3 4 5 1 7 2 5 0 4 71 21 4 8 2 4 2 8 4 4 1 7 6 7 3 3 9 3 9 4 9 2 8 105 13 6 2 4 2 3 3 4 0 2 0 5 1 2 3 2 1 3 4 2 2 0 51 23 5 3 8 8 4 5 1 6 1 8 3 8 3 6 3 2 5 1 7 3 6 96 從表 2得到,交通事故占用一二車道與車道占用二三車道 相比,被迫進(jìn)行變道的車輛數(shù)目較少,故實際通行能力較大,車流量也更多。若車輛排隊為單位長 度所需時間為 t ,則當(dāng)車兩排隊長度為 l 時,通過障礙路段的車流量為 xt ,故 xtl 為通過障礙路段的車流量 Q 隨著車輛排隊長度變 化的辯化率。 現(xiàn)假設(shè) q 為變化率,參照藥物在體內(nèi)的分布與排除模型 【 3】 可建立如下微分方程模型 : ? ? 2DQ qDL ? ? ? ? ? ? ? 興義民族師范學(xué)院本科畢業(yè)論文 9 接下來分析變化率 q 與事故道路橫斷面實際通行能力 cB 、路段上有車流量 之間的關(guān)系。故 q 可用 cB 和 uC 表示為 : ( 3 )cuq B C? ? ? ? ? ? ? ? ? ? ? ? 其中 ? 、 ? 分別為 q 與 T 、 uC 的相關(guān)系數(shù),且 1???? ,通過給定視屏計量出交通事故發(fā)生后相同時段 內(nèi) cB 和 uC 的多組數(shù)據(jù)后用最小二乘法求出。 1???? 是由于從視頻讀取的數(shù)據(jù)以及其他數(shù)巨量的選取過程中存在一定的誤差,但此誤差為 3%較小,擬合程度較高。從視頻 1 中讀取事故發(fā)生后任意時間段通過障礙路段的車流量即可確定 1C ,現(xiàn)讀入 24Q? 輛 /秒,得出 1 628C? 輛 /時 。該模型為交通事故所影響的路段車輛排隊長度與事故橫斷面實際通行能力、事故持續(xù)時間、路段上游車流量 三者之間的關(guān)系模型。另外, 模型 1 中的道路實際同行能力 cB 我們已在問題一的模型當(dāng)中求出 cB =1077pcu/h。即從事故發(fā)生開始,經(jīng)過 93秒后車輛排隊長度將到達(dá)上游路口。 10 秒鐘后,交通燈由紅燈變?yōu)殇洘簦ㄒ允致房诘?通行情況來斷定),第二相位車輛通行,對上游路口的通行車輛的速度進(jìn)行估算(在正常情況下通行),可知上游車大約 23 秒(誤差不超過 1 秒)到達(dá)交通事故所處橫斷面,從事故發(fā)生到此時用去時間 43 秒,而此時交通開始擁堵,車輛開始排隊,由視頻一,事故后的第一次綠放行排隊長度是 120 米,此時事故所處橫斷面到上游路口的距離是 140 米,故不可能在第一批放行的車輛來時車輛排隊長度到達(dá)上興義民族師范學(xué)院本科畢業(yè)論文 11 游路口,并且交通燈在放行第一批 30 后由錄燈變?yōu)榱思t燈,紅燈期間,橫斷面到上游路口的路段離車輛排隊長度慢慢縮短,由于上游紅路燈時間的限制,縮短的距離不 是很大,當(dāng)燈十字路口的紅燈又變?yōu)殇洘?,從事故發(fā)生到此時用去時間73 秒,此時第二相位通行,段面到上游路口的路段離車輛排隊長度由開始加成23秒后,還在處于通行狀態(tài),而從事故發(fā)生到此時用去時間 93秒,橫斷面到上游路口的路段離車輛排隊長度將到達(dá)上游路口。 針對上述模型中所用數(shù)據(jù)均由人為統(tǒng)計而得出,與真實數(shù)據(jù)誤差 有較大的缺陷,可采用統(tǒng)計軟件對數(shù)據(jù)進(jìn)行統(tǒng)計以減少以上建模過程中的誤差。 在針對問題三建立微分方程模型過程中,系數(shù) ? 、 ? 的確定,可進(jìn)行擬合回歸,以減小系數(shù)誤差,提高模型的可用性。每一個環(huán)節(jié)的不認(rèn)真,都會導(dǎo)致思路的混亂 無法繼續(xù)論文的工作;隨便一個細(xì)節(jié)的不細(xì)心,文檔編輯中就會出現(xiàn)提示錯誤的紅線;任意的態(tài)度不端正,復(fù)制與粘貼,都會導(dǎo)致論文的牛頭不對馬嘴。 每當(dāng)這些時 候,是我的室友們,安慰和鼓勵我。四年了,仿佛就在昨天。只是今后大家就難得再聚在一起吃每年元旦那頓飯了吧,沒關(guān)系,各奔前程,大家珍重! 是我的同學(xué)們幫我分析,給我提意見。曾經(jīng)給予我莫大幫助的同學(xué)們,祝你們學(xué)業(yè)有成,萬事順利! 我迷茫無助的時候,是我的 論文導(dǎo)師陸美老師悉心的指導(dǎo)。為此,我要感謝我的導(dǎo)師,祝福您在今后的日子里天天幸??鞓?! 與此同時,我應(yīng)該感謝各位老師,感謝你們平日里對我的幫助,沒有你們的幫助,我將不會那么順利就完成我的畢業(yè)論文。 t=[1:1:30]。R39。 t=[1:1:31]。k39。Dq=(a*B+b*C)/L39。L39。 c=[5,14,2,9,6,14,8,1,11,9,10,6,7,14,4,16,6,14,2,12,11,0,7,1]。 polyfit(b,c,1) ans = 興義民族師范學(xué)院本科畢業(yè)論文 16 請您刪除一下內(nèi)容, O(∩ _∩ )O謝謝?。?! Many people have the same mixed feelings when planning a trip during Golden Week. With heaps of time, the sevenday Chinese 請您刪除一下內(nèi)容, O(∩ _∩ )O 謝謝?。?! National Day holiday could be the best occasion to enjoy a destination. However, it can also be the easiest way to ruin how you feel about a place and you may bee more fatigued after the holiday, due to battling the large crowds. During peak season, a dream about a place can turn to nightmare without careful planning, especially if you travel with children and older people. As most Chinese people will take the holiday to visit domestic tourist destinations, crowds and busy traffic are inevitable at most places. Also to be expected are increasing transport and acmodation prices, with the possibility that there will be no rooms available. It is also mon that you39。s largest virgin forest, and known for its spring and ecological environment, Arxan is marveled at by many tourists as the purest land on earth. You cannot miss out the Autumn of Arxan. It is definitely the best with brightlycolored scenery full of emotions. Autumn in the northern part of the country es earlier than the South. A September rain followed by the footprints of Autumn brings more colors to the once emerald green mountain and blooming grassland. Shutterbugs flock to see for themselves the marvel of splendid colors around the mountains and waters, many of whom have travel a long distance and even camp here only to capture a moment of the nature wonder. The silver birch turns golden, while the larch is still proudly green. You will find yourself drowned in the intoxicating red of the wild fruits as well as the glamour of flowers in full blown. And your heart will be lingering on the woods as it39。s misery, the cow told him to turn its hide into a pair of shoes after it died. The magic shoes whisked Niulang, who carried his two children in baskets strung from a shoulder pole, off on a chase after the empress. The pursuit enraged the empress, who took her hairpin and slashed it across the sky creating the Milky Way which separated husband from wife. But all was not lost as magpies, moved by their love and devotion, formed a bridge across the Milky Way to reunite the family. Even the Jade Emperor was touched, and allowed Niulang and Zhinu to meet once a year on the seventh night of the seventh month. This is how Qixi came to be. The festival can be traced back to the Han Dynasty (206 BCAD 220). Traditionally, people would look up at the sky and find a bright star in the constellation Aquila as well as the star Vega, which are identified as Niulang and Zhinu. The two stars shine on opposite sides of the Milky Way. Customs In bygone days, Qixi was not only a special day for lovers, but also for girls. It is also known as the Begging for Skills Festival or Daughte
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