Open AccessStudy on contactless measurement method of dropper load
Author(s) -
Jidong Liu,
Jiqin Wu,
Runan Liang,
Junying Cheng,
Weirong Chen
Publication year - 2022
Publication title -
advances in mechanical engineering/advances in mechanical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.318
H-Index - 40
eISSN - 1687-8140
pISSN - 1687-8132
DOI - 10.1177/16878132221089168
Subject(s) - catenary , vibration , superposition principle , structural engineering , engineering , displacement (psychology) , enhanced data rates for gsm evolution , suspension (topology) , angular displacement , acoustics , mathematics , physics , mathematical analysis , psychology , telecommunications , homotopy , pure mathematics , psychotherapist
The fatigue fracture of dropper will threaten the safe operation of high-speed railway. The accurate measurement of dropper load plays an important role in dropper fatigue test and service life prediction. In this work, according to the structural characteristics of catenary suspension and based on string vibration theory, a contactless method for measuring dropper load is proposed. In this method, the edge recognition technology is used to obtain the vibration displacement time history data of the dropper clamp position on the messenger wire, the random vibration is transformed into the linear superposition of sinusoidal vibration through Fourier transform to solve the vibration differential equation. Through the relationship between the shape change of messenger wire and concentrated force, the change of dropper load is analyzed. The measurement accuracy is tested on the test platform built in the laboratory, and the results show the measurement accuracy can reach 0.50%.