Print Email Facebook Twitter Experimental Investigation Into the Condition of Insulated Rail Joints by Impact Excitation Title Experimental Investigation Into the Condition of Insulated Rail Joints by Impact Excitation Author Oregui, M. Molodova, M. Nunez, A. Dollevoet, R.P.B.J. Li, Z. Faculty Civil Engineering and Geosciences Department Structural Engineering Date 2015-07-08 Abstract This paper presents a feasibility study to determine if the health condition of Insulated Rail Joints (IRJs) can be assessed by examining their dynamic response to impact excitation. First, a reference dynamic behavior is defined in the frequency domain of 50-1200 Hz based on field hammer test measurements performed on a IRJ baseline (i.e., a set of IRJ without visible damage). Then, measurements on IRJs with different damage states are compared to the IRJ baseline response via the frequency response function (FRF) based statistical method. Three cases of IRJs are analyzed: a IRJ with a broken fastening, a IRJ with a damaged insulation layer and a IRJ with a rail top with plastic deformation. Combining hammer test measurements, hardness measurements and pictures of the IRJs, two frequency bands were identified as characteristic for damaged IRJs. In the identified high frequency band (1000-1150 Hz), the measured dynamic response with both a vehicle-borne health monitoring system and hammer tests shows a clear difference between the damaged IRJs and the IRJ baseline. Furthermore, different damage types may be able to be identified by examining the dynamic responses in the identified mid-frequency band (420-600 Hz). Further analysis over a larger number of IRJs may complete and support the promising results so that the information can be employed for the condition assessment and monitoring of IRJs. Subject health monitoringinsulated rail jointhammer testaxle box acceleration measurementhardness testfrequency response function based statistical method To reference this document use: http://resolver.tudelft.nl/uuid:8f6d35c1-dbe8-47ed-ab4c-8c08b705b634 Publisher Springer ISSN 0014-4851 Source https://doi.org/10.1007/s11340-015-0048-7 Source Experimental Mechanics, 2015 Part of collection Institutional Repository Document type journal article Rights © 2015 The Author(s)This article is published with open access at Springerlink.com Files PDF Li_2015.pdf 3.63 MB Close viewer /islandora/object/uuid:8f6d35c1-dbe8-47ed-ab4c-8c08b705b634/datastream/OBJ/view