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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Intelligent driver model ： ウィキペディア英語版 Intelligent driver model In traffic flow modeling, the intelligent driver model (IDM) is a time-continuous car-following model for the simulation of freeway and urban traffic. It was developed by Treiber, Hennecke and Helbing in 2000 to improve upon results provided with other "intelligent" driver models such as Gipps' Model, which lose realistic properties in the deterministic limit. ==Model definition== As a car-following model, the IDM describes the dynamics of the positions and velocities of single vehicles. For vehicle $\backslash alpha$, $x\_\backslash alpha$ denotes its position at time $t$, and $v\_\backslash alpha$ its velocity. Furthermore, $l\_\backslash alpha$ gives the length of the vehicle. To simplify notation, we define the ''net distance'' $s\_\backslash alpha\; :=\; x\_\; -\; x\_\backslash alpha\; -\; l\_$, where $\backslash alpha\; -\; 1$ refers to the vehicle directly in front of vehicle $\backslash alpha$, and the velocity difference, or ''approaching rate'', $\backslash Delta\; v\_\backslash alpha\; :=\; v\_\backslash alpha\; -\; v\_$. For a simplified version of the model, the dynamics of vehicle $\backslash alpha$ are then described by the following two ordinary differential equations: :$\backslash dot\_\backslash alpha\; =\; \backslash frac\; =\; v\_\backslash alpha$ :$\backslash dot\_\backslash alpha\; =\; \backslash frac\; =\; a\backslash ,\backslash left(\; 1\; -\; \backslash left(\backslash frac\backslash right)^\backslash delta\; -\; \backslash left(\backslash frac\backslash right)^2\; \backslash right)$ :$\backslash texts^$ *(v_\alpha,\Delta v_\alpha) = s_0 + v_\alpha\,T + \frac{2\,\sqrt{a\,b}} $v\_0$, $s\_0$, $T$, $a$, and $b$ are model parameters which have the following meaning: * ''desired velocity'' $v\_0$: the velocity the vehicle would drive at in free traffic * ''minimum spacing'' $s\_0$: a minimum desired net distance. A car can't move if the distance from the car in the front is not at least $s\_0$ * ''desired time headway'' $T$: the desired time headway to the vehicle in front * ''acceleration'' $a$ * ''comfortable braking deceleration'' $b$ The exponent $\backslash delta$ is usually set to 4. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Intelligent driver model」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.