Publikationen


Suche nach „[M.] [Lenz]“ hat 2 Publikationen gefunden
Suchergebnis als PDF
    NachhaltigAngewandte Naturwissenschaften und WirtschaftsingenieurwesenTC Weißenburg

    Beitrag (Sammelband oder Tagungsband)

    Damigos, Y., V. Kalidromitis, S. Camarinopoulos, Frankenstein, B., Loupos, K., A. Tsertou, Gerhard, R., Amditis, A., Anastasopoulos, S. Lenas, K. Lenz, S. Schneider, M. Hill, Wirges, W., Dmitry Rychkov, A. Adesiyun, V. Tsaoussidisa

    Skin-like Sensor Enabled Bridge Structural Health Monitoring System

    Proceedings of the 8th European Workshop On Structural Health Monitoring (EWSHM 2016), Bilbao, Spain

    2016

    Abstract anzeigen

    Structural Health Monitoring (SHM) has an important role in the management of transport infrastructure. However, most SHM techniques are based on data obtained from dense networks of point-based sensors (rather than sparse networks of spatial sensors) and so, inrelative terms, they are costly to implement. Most commercially available strain sensors have a limited maximum range - typically 1% to 2% - and are not well-suited to providing information of a severe loss of structural integrity. The SENSKIN project develops a dielectric-elastomer and micro-electronics-based skin-like sensor, based on the use of a largehighly extensible capacitance sensing membrane and advanced micro-electronic circuitry, for monitoring transport infrastructure - such as bridges. The sensor will provide spatial measurements of strain of more than 10% and is being designed to (a) require low power to operate, (b) be easy to install (c) have a comparable or lower cost than conventional strain sensors, (d) allow simple signal processing, and (e) have the ability to self-monitor and self-report. The system will support the new and emerging technology of Delay/Disruption-Tolerant Networking to secure that strain measurements acquired will reach the base station even under extreme conditions where communications may be disrupted. SENSKIN also develops a Decision-Support-System (DSS) for proactive condition-based structural interventions under normal operating conditions and reactive emergency intervention following an extreme event. In assessing potential rehabilitation options, the DSS will use the data supplied by the SENSKIN sensors together with advanced structural analysis models, whilst taking account of the lifecycle economic, social and environmental implications. The overall monitoring system will be evaluated and benchmarked on actual bridges of Egnatia Highway (Greece) and Bosporus Bridge (Turkey). This paper describes the concept and principles of the SENSKIN sensing system, and its various components with attention to end-user requirements, specifications and system architecture.

    Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen

    Zeitschriftenartikel

    M. Lenz, Engelbert Hofbauer

    Vignettierung als physikalisches Messprinzip zur zweidimensionalen Winkelmessung

    tm - Technisches Messen, vol. 75, no. 3, pp. 153-167

    2008

    DOI: 10.1524/teme.2008.0824

    Abstract anzeigen

    Ein neues Verfahren mit vignettierender Feldblendenauswertung nutzt die Vignettierung zur Winkelmessung und umgeht die Problematik der Messbereichseinschränkung beim klassischen Autokollimator. Messprinzip, Messbereich sowie die mathematischen Grundlagen mit numerischer Simulation werden vorgestellt. Die Einflüsse geometrischer und photometrischer Effekte auf die Intensitätsverteilung sowie auf die dadurch verursachte Linearitätsabweichung werden theoretisch hergeleitet und mit experimentellen Werten verglichen. A newly developed measuring procedure uses vignetting to evaluate angles and angle changes. That enables to avoid the problem of restricted measuring range with the classical autocollimator. Principles of measurement, measuring range, as well as the mathematical basics with numerical simulation are presented. The influences of geometrical and photometric effects on the intensity profile and on the linearity error are discussed and compared with experimental values.