Browsing by Author "Ueckermann, Andreas"

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    Further Investigations On The Weighted Longitudinal Profile
    Spielhoffer, Roland; Ueckermann, Andreas (2012)
    The weighted longitudinal profile (WLP) is a recent approach to characterize evenness of roads. This paper focuses on the development of an evaluation scheme for motorways derived from the power spectral density of the profile. When the evaluation scheme is established, the derived limits are verified. Different surface types (asphalt, concrete) and the influence of their typical evenness characteristic on the evaluation by the WLP are investigated. The WLP shows to be capable to clearly bring out these characteristics without introducing a bias into the evaluation. Motorway networks in Germany and Austria (data from first and second lane) are evaluated then. In comparison to the IRI (currently in use in Austria), the WLP shows a lot more differentiation between good and bad sections. A comparison of WLP and the planograph in the frame of new work approval of motorway sections in Austria is drawn, but further research is necessary to get a conclusive picture of a possible change in the new work approval regulations. Furthermore, the Austrian motorway ramps and intersections are evaluated. An adaptation of the evaluation scheme is proposed to take into account the different driving speed on ramps and hence lower requirements regarding the evenness.
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    A Routine Monitoring Method Using Weighted Longitudinal Profile
    Kamiya, Keizo; Kawamura, Akira; Glattki, Winfried; Ueckermann, Andreas (2012)
    Weighted Longitudinal Profile (WLP) which is a new index for characterizing longitudinal evenness was introduced in SURF 2008. As a result of sensitivity analysis of the WLP method using longitudinal profile data from the Japanese motorways, each of road surface distress showed its own identical tendency in a relationship between ΔWLP and σWLP. Moreover, since data sites with larger ΔWLP of bridge joint tend to emerge upward in the relation between profile variation Δ and standard deviation of profile σ in octave bands #3 and #4, both octave bands are considered to give critical values to the original surface profile. Because a laser profiler and a mobile profiling system, named STAMPER showed a similar slope of regression between Δ and σ, STAMPER can be used as alternative of laser profiler. By driving a STAMPER-equipped rent-a-car for 5 days on Autobahn, it was observed that IRI is distributed quite similarly between Autobahn and NEXCO motorways. It was also found that octave bands #5 and #6 are prevailing when profile variation Δ is low, or road surface is less deteriorated. Finally if STAMPER can be used routinely and WLP is calculated for surface distress type, this will be an innovative monitoring method.