TY - JOUR A1 - Dackermann, U. A1 - Yu, Y. A1 - Niederleithinger, Ernst A1 - Li, J. A1 - Wiggenhauser, Herbert T1 - Condition Assessment of Foundation Piles and Utility Poles Based on Guided Wave Propagation Using a Network of Tactile Transducers and Support Vector Machines JF - Sensors N2 - This paper presents a novel non-destructive testing and health monitoring system using a network of tactile transducers and accelerometers for the condition assessment and damage classification of foundation piles and utility poles. While in traditional pile integrity testing an impact hammer with broadband frequency excitation is typically used, the proposed testing system utilizes an innovative excitation system based on a network of tactile transducers to induce controlled narrow-band frequency stress waves. Thereby, the simultaneous excitation of multiple stress wave types and modes is avoided (or at least reduced), and targeted wave forms can be generated. The new testing system enables the testing and monitoring of foundation piles and utility poles where the top is inaccessible, making the new testing system suitable, for example, for the condition assessment of pile structures with obstructed heads and of poles with live wires. For system validation, the new system was experimentally tested on nine timber and concrete poles that were inflicted with several types of damage. The tactile transducers were excited with continuous sine wave signals of 1 kHz frequency. Support vector machines were employed together with advanced signal processing algorithms to distinguish recorded stress wave signals from pole structures with different types of damage. The results show that using fast Fourier transform signals, combined with principal component analysis as the input feature vector for support vector machine (SVM) classifiers with different kernel functions, can achieve damage classification with accuracies of 92.5% ± 7.5%. KW - Structural Health Monitoring KW - Non-Destructive Testing KW - Sensor network KW - Support vector machine KW - Utility poles PY - 2017 UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-434868 UR - http://www.mdpi.com/1424-8220/17/12/2938 DO - https://doi.org/10.3390/s17122938 SN - 1424-8220 VL - 17 IS - 12 SP - Article 2938, 1 EP - 16 PB - MDPI CY - Basel, Schweiz AN - OPUS4-43486 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Hong, Shuxian A1 - Wiggenhauser, Herbert A1 - Helmerich, Rosemarie A1 - Peng, B.D. A1 - Xing, D. F. T1 - Long-term monitoring of reinforcement corrosion in concrete using ground penetrating radar JF - Corrosion Science N2 - A new method for periodically monitoring reinforcement corrosion in concrete with Ground-Penetrating Radar (GPR) is proposed and a ten-year long-term corrosion periodic monitoring experiment is reported. GPR historical data was taken in different years, under different conditions. In order to align and normalize the obtained images properly prior to effectively performing any automatic defect detection, image registration techniques based on mutual-information are employed, and a new signal processing scheme is proposed for normalizing the intensity of GPR images. Then, the processed image results can be used to compare and find out the change of GPR detection due to corrosion. KW - Steel reinforced concrete KW - Atmospheric corrosion KW - Pitting corrosion PY - 2017 DO - https://doi.org/10.1016/j.corsci.2016.11.003 SN - 0010-938X VL - 114 SP - 123 EP - 132 PB - Elsevier Ltd. AN - OPUS4-38346 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Niederleithinger, Ernst A1 - Wiggenhauser, Herbert A1 - Mielentz, Frank A1 - Bertschat, Anja-Sophie A1 - Mierschke, Vivien A1 - Werner, Andreas T1 - Untersuchung von Veränderungen in Beton mit Ultraschall-Codawelleninterferometrie N2 - Die Coda transmittierter Ultraschallsignale in Beton enthält Informationen zu Struktur und Zustand des Materials bzw. deren Änderung. Relevant sind u. a. Temperatur, Stress, Feuchtigkeit und verschiedene Schädigungsmechanismen. Die zahlreichen Einflussfaktoren sind nur schwer zu trennen und die Messeffekte oft zu Beginn sehr klein.Die CWI ermöglicht die Detektion kleinster Geschwindigkeitsveränderungen durch den Vergleich, der in kleinen Schritten gestauchten oder gestreckten Signalen mit eine Referenzmessung. Andere Indikatoren für Änderungen im Material sind: • Kreuzkorrelation • Laufzeit direkte Welle • Energie/Amplitude • Änderungen im Frequenzspektrum Die beschriebene Technik wird von uns bisher primär in klein- und großskaligen Laborversuchen genutzt. Die Forschung konzentriert sich auf die Untersuchung und Trennung verschiedener Einflusseffekte. Aber auch erste reale Bauwerke wurden schon instrumentiert, z. B. Brücken und eine Tunneldecke. T2 - 77. Jahrestagung der Deutschen Geophysikalischen Gesellschaft CY - Potsdam, Germany DA - 27.03.2017 KW - Beton Ultraschall Monitoring PY - 2017 AN - OPUS4-39661 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Wiggenhauser, Herbert T1 - FA ZfPBau - Welches sind die Zukunftsthemen? N2 - Vortrag über die bisherige Arbeit des Fachausschusses ZfP im Bauwesen und über mögliche zukünftige Themenfelder. T2 - FA ZfP im Bauwesen CY - Berlin, Germany DA - 11.05.2017 KW - DGZfP KW - Bauwesen KW - Zukunft PY - 2017 AN - OPUS4-40236 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Wiggenhauser, Herbert T1 - Non-destructive testing in civil engineering at BAM N2 - Non-Destructive assessment of the National Infrastructure in Germany has been the topic of R&D at BAM since many years. In 1989 BAM has established a R&D group dedicated to the development and application of Non-Destructive Testing in Civil Engineering. Since then, this group has left has participated in numerous research projects and cooperated with many researches and institutes worldwide. A complex system of inspection and maintenance is in place to inspect and maintain roads, bridges, tunnels and other installations. Based on visual inspection structures like bridges are inspected regularly. In case of concerns which cannot be resolved in this process, a procedure “Object Oriented Damage Analysis” has been put into place where additional inspection methods, especially NDT methods, are being utilized. NDT methods to establish material properties such as strength, porosity, moisture, carbonation, etc need more attention to strengthen the links between engineers and inspectors. BAM and TU Berlin have established a joint Junior Professor to address this research area with gravity. Research is currently focused on methods, data, validation, certification and standardization. Industry 4.0 has become a widely discussed topic with unforeseeable impact. Current research topics include - Large Aperture UltraSound (LAUS) to evaluate very thick concrete elements (> 1m) - Embedded ultrasound sensors to monitor changes in concrete - Data fusion algorithms for honeycomb detection, corrosion localization and reinforcement diameter determination - Reverse Time Migration to improve imaging of concrete structures - Laser Induced Breakdown Spectroscopy (LIBS) with new applications, improved sensitivity and resolution, new devices - RFID based humidity and corrosion sensors - Analysis of scattered Radar waves for the classification of concrete - Development of reference specimens for selected NDT tasks The presentation will present examples of current research and ideas for research directions. T2 - FHWA Seminar CY - Washington, D.C., USA DA - 25.07.2017 KW - Non-destructive Testing in Civil Engineering KW - Ultrasound; RFID KW - Ground Penetrating Radar KW - Laser Induced Breakdown Spectroscopy KW - Data Fusion KW - Large Aperture UltraSound (LAUS) KW - Monitoring of Concrete Structures KW - Reference Specimen PY - 2017 AN - OPUS4-41256 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Wiggenhauser, Herbert T1 - Nondestructive testing in civil engineering N2 - Vortrag über die Aktivitäten des Fachbereichs 8.2 in der zerstörungsfreien Prüfung im Bauwesen. T2 - 7th international Workshop on Structural Life Management of Eco-Power Structures CY - Daejeon, Korea DA - 20.09.2017 KW - ZfPBau KW - Zerstörungsfreie Prüfung KW - Bauwesen KW - Infrastruktur PY - 2017 AN - OPUS4-42203 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Wiggenhauser, Herbert T1 - Non-Destructive Testing in Civil Engineering JF - Journal of Infrastructure Systems N2 - Preface to Special Collection of coutributions to the International Symposium NDT-CE 2015 in Berlin/ Germany. KW - NDT KW - Civil engineering PY - 2017 DO - https://doi.org/10.1061/(ASCE)IS.19-555X.0000398 SN - 1076-0342 SN - 1943-555X VL - 23 IS - 4 SP - 02017001-1 AN - OPUS4-42204 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Wiggenhauser, Herbert T1 - Application of NDT to nuclear structures N2 - The presentation is #4 of the lecture series within the CE5390 NDT&E Course at the “University of Texas at El Paso”, USA (UTEP): 1. Application of NDT to Transportation Infrastructure 2. Application of NDT to Pavements 3. Application of NDT to Tunnels 4. Application of NDT to Nuclear Structures 5. Ultrasonic Methods 6. Electrical Resistivity (ER) 7. Galvanostatic Pulse Measurement (GPM) 8. Half-Cell Potential (HCP) 9. Ground Penetrating Radar (GPR) to Infrastructure 10. Ground Penetrating Radar (GPR) to Pavements 11. Impact Echo (IE)/Ultrasonic Surface Waves (USW) 12. Infrared Thermography (IR) 13. Magnetic Flux Leakage (MFL) 14. Ultrasonic Tomography (UST) 15. Falling Weight Deflectometer/Light Weight Deflectometer 16. Spectral Analysis of Surface Wave 17. Traffic Speed Deflectometer 18. Integrity of Foundations 19. Integration of Technologies Applications of NDT for nuclear structures are presented with an overview over the special challenges for NDE in this area. The lecture was held as a webinar on August 29, 2017 T2 - Webinar UTEP CE 5390 Special Topics Civil Engineering CY - Berlin, Germany DA - 31.08.2017 KW - Non-destructive testing in civil engineering KW - Nuclear structures PY - 2017 AN - OPUS4-41810 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Wiggenhauser, Herbert T1 - Bauwerksdiagnostik – Indikatoren für die Zukunft T1 - Building Diagnostics - Indicators for the Future JF - Bautechnik N2 - Vor dem Hintergrund der alternden Verkehrsinfrastruktur und des großen Bauwerksbestands allgemein gewinnt deren Zustandserfassung an Bedeutung. Durch die Einführung von Bauwerksmanagementsystemen und die Digitalisierung der Wirtschaft im Rahmen von Industrie 4.0 wird diese Entwicklung noch mehr Dynamik entfalten. Die Vernetzung von Zustandsdaten mit der Belastung, Wartung und Instandsetzung sowie der politischen Planung, wird eine hohe Bedeutung bekommen. Angesichts der Altersstruktur der Verkehrsinfrastruktur und begrenzter öffentlicher Gelder wird zukünftig eine selektive Instandsetzung von Bauwerken nach deren Zustandsnoten notwendig sein. Zerstörungsfreie Untersuchungsverfahren für Bauwerke nehmen in diesem Kontext eine wichtige Rolle ein, sie sollen die quantitativen Zustandsdaten erbringen und in die Datenbanken für Managementsysteme mit zuverlässigen und objektiven Messdaten füllen. KW - Bauwerksdiagnostik KW - Zerstörungsfreie Prüfung KW - Infrastruktur PY - 2017 DO - https://doi.org/10.1002/bate.201771003 SN - 1437-0999 VL - 94 IS - 10 SP - 675 EP - 675 PB - Ernst & Sohn CY - Berlin AN - OPUS4-42618 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Wiggenhauser, Herbert A1 - Niederleithinger, Ernst A1 - Mielentz, Frank A1 - Kind, Thomas A1 - Krause, Martin A1 - Völker, Christoph A1 - Maack, Stefan A1 - Uhlig, Marc A1 - Algernon, Daniel A1 - Zoega, Andreas A1 - Mayer, K. T1 - Acoustic and electromagnetic waves in nondestructive testing in civil engineering N2 - Research and Development; Application of NDT for Civil Structures; Reference Specimen; Validation of Testing Solutions; Standardization; Training; Structural Investigation (thickness, location of elements, cracks, ...); Material Properties (strength, composition, moisture, …) T2 - WAVES Workshop Cambridge CY - Cambridge, UK DA - 26.03.2017 KW - Acoustic KW - Electromagnetic KW - Waves PY - 2017 AN - OPUS4-39629 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -