傳統單點雷射與2D雷射應用於平坦度之比較研究;The Comparative Study of Pavement Roughness with 1D and 2D Laser CCD

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Title:	傳統單點雷射與2D雷射應用於平坦度之比較研究;The Comparative Study of Pavement Roughness with 1D and 2D Laser CCD
Authors:	鍾閎文;Chung,Hung-Wen
Contributors:	土木工程研究所
Keywords:	二維雷射測距儀;平坦度;陀螺儀;慣性式平坦儀;Inertial Profilers;Gyroscope;IRI;2D Laser
Date:	2012-07-10
Issue Date:	2012-09-11 18:03:01 (UTC+8)
Publisher:	國立中央大學
Abstract:	路面之平坦度為路面重要特性，不僅為影響乘車的舒適度，亦提供於道路建設與維護評估之時機，而如何有效管理道路狀況，需定期檢驗及蒐集道路資料，過去檢驗技術大都為人力檢驗較費時且費工，故逐漸以慣性式平坦儀做為新式之檢測方法。慣性式平坦儀基礎係以非接觸式測距儀進行平坦度量測，而近年雷射技術發展相當快速，從過去單點雷射提升為二維雷射，本研究便嘗試以二維雷射取代單點雷射量測道路平坦度，比對兩者之間差異性，並以國內外開發慣性平坦儀之相關規範進行參考開發，而二維雷射量測為一斷面之量測，因此定義三種不同參數進行自我比對，包含剖面平均值、峰值值及中間值，探討三者之間是否具差異性。研究結果發現，不同參數的比較亦無差異，主因為平坦度之定義為巨觀，故在微小高程之差異上並不會造成平坦度太大之改變。依照規範要求，二維雷射應用於量測上與國際認證之ARRB Working Profiler、水準儀及單點雷射慣性平坦儀所量測之國際糙度指標並無差異，透過交叉相關性分析，結果發現二維雷射與其他儀器之相關性具高度相關，二維雷射應可使用於鋪面平坦度量測。Pavement roughness is an important feature of the Surface Services, not only does it affects the comfort of riding in a vehicle, but also shows the durability of the pavement allowing the Directorate General to evaluate the frequencies of pavement maintenance. Nevertheless, to have a more efficient control of pavement conditions, collecting the data of regular pavement roughness testing is required. In addition, the testing techniques in the past wasted more time and human resources compared to the new testing meters. As a result, inertial profilers and intelligent vehicle are generally used nowadays.In this research, 1D laser is replaced by 2D to examine pavement roughness in order to compare the differences of the results between the two laser rangefinders.Furthermore, the experimental results can be as well referred to the standards of AASHTO and CNS. Additionally, 2D laser calculates the longitudinal measurements of pavement. In consequence, there are three parameters including profile average rangefinder (PAR), profile peak value (PPV) and profile center value (PCV) defined to be analyzed and see if there is difference among these values.The results revealed that there is non-significant difference among these values. On account of the definition of roughness calculating formula is macroscopic so that the micro-gap in elevation can't make too much difference. According to the standards of AASHTO and CNS, examining pavement roughness by 2D laser suggested no dissimilarity with reference profiling devices, such as Australian Road Research Board Walking Profiler, level Instrument, 1D laser Inertial profiler and International Roughness Index (IRI).Likewise, the repeatability of 2D laser was evaluated by computing the Average Cross Correlation (ACC) (IRI filtered) and the result is highly positive correlation with other devices. It is also no significant different from the result of other devices in Root Mean Square (RMS). Thus 2D laser can be equipped with inertial profilers.
Appears in Collections:	[Graduate Institute of Civil Engineering] Electronic Thesis & Dissertation

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