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首頁> 外文學位 >Influence of road roughness and directional maneuvers on the dynamic performance of heavy vehicles.
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Influence of road roughness and directional maneuvers on the dynamic performance of heavy vehicles.

機譯：道路不平整度和定向操縱對重型車輛動力性能的影響。

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The gross vehicle weight (GVW) and dimensions of articulated freight vehicles have been considerably relaxed during the past few decades, which have contributed to many concerns related to highway safety and preservation of the roadways. The directional dynamics of articulated heavy vehicles is investigated to study the influence of road roughness on the directional performance measures and the road damage potentials of the vehicle undergoing a directional maneuver. The directional performance characteristics and the road damage potentials are investigated for low speed cornering and high-speed directional maneuvers. A number of measured road profiles are analyzed to identify three groups of roads, namely: smooth, medium and rough roads based on their roughness index (RI) values. A detailed analysis of the road roughness data is carried out to derive correlation between the right and left wheel excitations. A range of performance measures are formulated to study the influence of road roughness on the directional dynamics and the influence of steering maneuver on the pavement damage. The equations of motion of the vehicle are solved for typical low-speed cornering, and high-speed lane-change and evasive maneuvers. The results of the study show that the road roughness affects some of the directional performance measures of the vehicle in a significant manner, specifically the lateral load transfer ratio related to dynamic rollover potential of the vehicle. The study also revealed that the multiple excitations arising from the tire-road interactions and the directional maneuvers, significantly contribute to the dynamic wheel loads transmitted to the pavement. The contributions of excitations arising from directional maneuvers to the dynamic wheel load are presented in terms of different measures, which have been related to the road damaging potentials of heavy vehicles. These measures include dynamic load coefficient, the dynamic road stress factor and the peak tire force.
機譯：在過去的幾十年中，鉸接式貨運車輛的車輛總重（GVW）和尺寸已大大放松，這引起了許多與高速公路安全和道路養(yǎng)護有關(guān)的擔憂。對鉸接式重型車輛的方向動力學進行了研究，以研究路面不平度對方向性測度的影響以及進行方向性操縱的車輛的道路破壞潛力。針對低速轉(zhuǎn)彎和高速定向操縱，研究了方向性能特性和潛在的道路破壞潛力。分析許多測得的道路輪廓，以根據(jù)其粗糙度指數(shù)（RI）值識別三組道路，即：平坦，中等和粗糙道路。對道路粗糙度數(shù)據(jù)進行了詳細分析，以得出左右車輪激勵之間的相關(guān)性。制定了一系列性能指標，以研究路面不平整度對方向動力學的影響以及轉(zhuǎn)向操縱對路面損壞的影響。對于典型的低速轉(zhuǎn)彎，高速車道變換和回避操作，求解了車輛的運動方程。研究結(jié)果表明，路面不平度會顯著影響車輛的某些方向性能指標，特別是與車輛動態(tài)側(cè)翻潛力相關(guān)的橫向載荷傳遞比。研究還表明，輪胎-道路相互作用和方向性操縱引起的多重激勵極大地促進了傳遞給人行道的動態(tài)車輪載荷。定向操縱引起的激勵對車輪動態(tài)載荷的貢獻是通過不同的方法來表示的，這些方法與重型車輛的道路破壞潛力有關(guān)。這些措施包括動載荷系數(shù)，動態(tài)道路應力因子和輪胎峰值力。

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