Searched for: subject%3A%22Contact%255C+force%22
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Zhang, P. (author), Li, S. (author), Li, Z. (author)
Short pitch corrugation is a quasi-periodic rail defect that induces a high level of noise and accelerates track degradation. This paper proposes a methodology to mitigate short pitch corrugation by rail constraint design, including four steps. In Step 1, corrugation is numerically reproduced by employing a three-dimensional (3D) finite...
journal article 2023
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Song, Yang (author), Wang, H. (author), Frøseth, Gunnstein (author), Nåvik, Petter (author), Liu, Zhigang (author), Rønnquist, Anders (author)
The interaction performance of the pantograph-catenary is of great importance as it directly determines the current collection quality and operational safety of trains. The finite element method (FEM) is dominantly used for simulating pantograph-catenary interaction, which is normally computationally heavy. In this work, addressing the...
journal article 2023
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Zhang, P. (author), Li, Z. (author)
This paper presents an experimental study on the development mechanism of short pitch corrugation using an innovative downscale V-Track test rig. Rail corrugation is reproduced in the V-Track with two wavelengths of 6.4 mm and 8.9 mm. Based on the measured wheel-rail contact forces, track dynamic behaviors, and observations, the consistent...
journal article 2023
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Zhang, Zhihai (author), Xiao, Hong (author), Wang, Y. (author), Fang, Jia (author), Nadakatti, M. M. (author), Wang, Haoyu (author)
The lateral resistance of ballast bed is an important parameter to prevent track expansion and maintain track stability. The invasion of sand particles can cause the change of lateral resistance of ballast bed and affect the stability of track structure, but little attention has been paid to the change characteristics of nonlinear lateral...
journal article 2022
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Xing, Chao (author), Liu, Bo (author), Sun, Zhiqi (author), Tan, Yiqiu (author), Liu, X. (author), Zhou, Changhong (author)
Asphalt mixture is a skeleton filling system consisting of aggregate, asphalt, and mineral powder. High performance asphalt mixture design is directly affected by internal stress transmission of skeleton filling system. In this paper, the discrete element method based on digital image was employed to study the stress transmission. By...
journal article 2022
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Xiao, Hong (author), Zhang, Zhihai (author), Chi, Yihao (author), Wang, Xiaoyu (author), Wang, Haoyu (author), Jiang, Ziqing (author)
The sand intrusion in railway tracks in sandy regions can significantly change the mechanical behaviour of tracks and thus threaten the safety of train operation. This paper presents substantial field tests on both sandy and clean railway tracks to study the effect of sand intrusion on the longitudinal resistance of ballast bed and the...
journal article 2022
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Martinelli, M. (author), Galavi, Vahid (author)
This paper describes an MPM formulation using linear quadrilateral elements suitable for soil-structure-interaction problems. The volumetric locking and stress-oscillations are mitigated using a reduced integration technique and the Gauss integration scheme, respectively. The formulation can be used with both structured and unstructured...
journal article 2022
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Rijneveld, Martin (author)
For railway travel the Insulated Rail Joint (IRJ) is a critical part in most railway safety systems but at the same time also considered a weak link. The IRJ creates a discontinuity in stiffness and geometry that leads to wheel-rail impact forces. The angled IRJ is a proposal to reduce these impact forces. Despite the real-world experiences with...
master thesis 2021
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Song, Yang (author), Wang, H. (author), Liu, Zhigang (author)
In railway pantograph-catenary systems, the contact surfaces undergo wear in long-term operations, directly affecting interaction performance and potentially deteriorating the current collection quality. The effect of contact wire wear (CWW) on the current collection quality should be evaluated to understand the system's health status in...
journal article 2021
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Zhang, P. (author), Moraal, J. (author), Li, Z. (author)
An innovative downscale test rig called V-Track has been constructed for wheel-rail contact experiments under impact loading conditions. In this paper, a force measurement system termed a dynamometer was developed in V-Track to measure the wheel-rail contact forces. The dynamometer consists of four 3-component piezoelectric force sensors and...
journal article 2021
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Eenkhoorn, Chantal (author)
BACKGROUND: Knee problems are the most common complaints of the lower extremity in the Netherlands. Osteoarthritis has the highest prevalence of all knee complaints. Knee osteoarthritis is likely to start at the patellofemoral joint and is associated with the aggravation of pain. Mechanical overloading is hypothesized to contribute to the...
master thesis 2019
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Adriaanse, Michiel (author)
A new photoplethysmography-based device called the Multiphotodiode Array (MPA) was validated to successfully measure the PWV in the vasculature of the distal phalanx of healthy subjects. It comprises an array of photodiodes and an array of opposing LEDs to detect blood volume changes due to the passing pressure pulse wave in the vasculature of...
master thesis 2019
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Damsteeg-van Berkel, Selma (author), Beemster, Fleur (author), Dankelman, J. (author), Loeve, A.J. (author)
Purpose: DNA is a highly valuable lead to identify people who were possibly involved in a crime. Even by small contact events, minute amounts of DNA (‘trace DNA’) can be transferred from a DNA source to an evidentiary item, which can be enough for a successful DNA analysis. The focus of this research is to get more insight in the collection...
journal article 2019
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Deng, X. (author), Li, Z. (author), Qian, Zhiwei (author), Zhai, Wanming (author), Xiao, Qian (author), Dollevoet, R.P.B.J. (author)
Weld-induced squats are a major damage type in high-speed railways as well as in conventional railways. They incur high maintenance costs and endanger operational safety. This paper first presents and analyzes five-year continual field monitoring observations and measurements of squats at rail welds. A hypothesis of the formation and development...
journal article 2019
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Richards, R. E. (author), Andersen, M. S. (author), Harlaar, J. (author), van den Noort, J. C. (author)
Objective: To evaluate 1) the relationship between the knee contact force (KCF) and knee adduction and flexion moments (KAM and KFM) during normal gait in people with medial knee osteoarthritis (KOA), 2) the effects on the KCF of walking with a modified gait pattern and 3) the relationship between changes in the KCF and changes in the knee...
journal article 2018
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Zamiralova, M. (author)
This dissertation investigates how to design a pipe belt conveyor system in a more effective way, considering two aspects: to ensure conveyor belt has sufficient bending stiffness to form an enclosed pipe shape without a contact loss with the idler rolls; and to reduce energy consumption of the system from the indentation rolling resistance. <br...
doctoral thesis 2017
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Damsteeg-van Berkel, S. (author)
DNA can function as a significant part of evidence in forensic investigation, because it can link a potential perpetrator to a crime. Even by skin contact, micro-traces of DNA-containing material can be transferred. This type of DNA is called ‘trace DNA’. When DNA is collected from an evidentiary item for forensic purposes, the goal is to...
master thesis 2017
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Liu, Zhigang (author), Wang, H. (author), Dollevoet, R.P.B.J. (author), Yang, S. (author), Nunez, Alfredo (author), Zhang, J. (author)
This paper explores the use of pantograph-catenary contact force (PCCF) for monitoring of the current collection quality and detection of anomalies in the interaction between pantograph and catenary. The concept of catenary structure wavelength (CSW) is proposed as the dominant component of PCCF. It describes the signal components caused by the...
journal article 2016
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Zamiralova, M. (author)
conference paper 2015
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Arnet, U. (author), Van Drongelen, S. (author), Van de Woude, L.H.V. (author), Veeger, H.E.J. (author)
Background The manual wheelchair user population experiences a high prevalence of upper-limb injuries, which are related to a high load on the shoulder joint during activities of daily living, such as handrim wheelchair propulsion. An alternative mode of propulsion is handcycling, where lower external forces are suggested to be applied to reach...
journal article 2012
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