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Establishing multi-combination vehicle trajectories under acceleration from rest

机译：从静止加速建立多组合车辆的轨迹

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摘要

Multi-combination vehicles (MCVs) that require long times to clear intersections or railway level crossings from rest can cause excessive delay to other traffic, and compromise safety if sight distances are inadequate. Intersection clearance time is of most concern in urban areas, because of its effect on vehicle productivity and the safety and efficiency of intersections. Clearance time at railway level crossings is of concern because trains require clear passage. Over a given merging distance, an MCV attains a lower speed than smaller vehicles, which may compromise the safety and efficiency of the merge area. This paper reviews current specifications for clearance time and acceleration and speed characteristics of MCVs. It reports an in-field testing program conducted to measure trajectories of a range of MCVs and a model calibrated from the tests to describe vehicle trajectory. It then examines trajectories of MCVs based on the model, compares results with current specifications, and identifies avenues of future research. An understanding has been gained from this model on the retarding influences of mass and grade on acceleration capability and attained speed. Curves estimating clearance times for crossing widths, and speed as a function of travel distance, have been established for each MCV tested, across a range of grades. The model has been used to quantify acceleration capabilities of various MCVs. It is recognised that further calibration of the trajectory model is required for estimation of trajectories over longer distances and higher speeds, and for prime movers of varying power and gearing.
机译：需要长时间清理十字路口或铁路平交道口以使其静止的多用途车辆（MCV）可能会导致其他交通的过度延误，并且如果视距不足，也会损害安全性。在城市地区，路口通行时间最受关注，因为它会影响车辆的生产率以及路口的安全性和效率。铁路平交道口的通关时间值得关注，因为火车需要通行。在给定的合并距离内，MCV的速度低于较小的车辆，这可能会损害合并区域的安全性和效率。本文回顾了MCV的清除时间以及加速和速度特性的当前规范。该报告报告了为测量一系列MCV的轨迹而进行的现场测试程序，以及根据测试校准后的模型以描述车辆的轨迹。然后，基于模型检查MCV的轨迹，将结果与当前规范进行比较，并确定未来研究的途径。通过该模型，可以了解质量和坡度对加速能力和达到的速度的延迟影响。已经为各种等级的被测MCV建立了估算交叉宽度的净空时间以及速度与行进距离的函数关系的曲线。该模型已用于量化各种MCV的加速能力。公认的是，对于更长距离和更高速度的轨迹估计以及变化的动力和传动装置的原动机，轨迹模型需要进一步校准。

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