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1	Contamination Level Detection of Hydraulic Pressure Filters in Forklifts : using only pump motor currents and load pressure measurements Sehlstedt, Robert, Sellén, Erik January 2022 (has links) With the advent of Industry 4.0 and the Internet of Things, collecting data on Cyber-Physical systems has become the norm practice in large scale industries. By collectingrelevant data, it is possible to monitor the health status of whole systems or specificcomponents within them. Such practices allow for historical maintenance strategies suchas reactive maintenance or preventive maintenance to be phased out.In this thesis two separate algorithms are presented, both designed to identify contaminationlevels in the hydraulic pressure filters of forklifts. Furthermore, in contrast torelevant literature for similar applications only sensory data from the hydraulic pump’smotor current and hydraulic fluid pressure at the load was used. More specifically, theproposed algorithms are based on trends observed in the relationship between the measurementsand how it changes over time. The algorithms were evaluated on data fromfour forklifts used in Toyota’s factory. The forklifts had been collecting data while usedin production for over a year.The results indicate strong evidence that both algorithms can be used to detect degradationin the hydraulic system. This is especially true for one forklift where it was knownthat the damage at the time of replacement was substantial. However, it cannot be trulyestablished without further testing whether the algorithms detect degradation in the filteror pump. forklift contamination level fault detection hydraulic pressure filter pump motor current pressure data pdm predictive maintenance rm reactive physical model modelling models moving window linear regression armature mean gaffeltruck kontamineringsnivå kontaminering detektering feldetektering tryckfilter hydraulikfilter hydraulfilter filter pumpfilter pump motor motorström tryck linjär regression linjärregression fysikalisk modellering modell armatur genomsnittsvärde fönster data datafönster Reliability and Maintenance Tillförlitlighets- och kvalitetsteknik

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Contamination Level Detection of Hydraulic Pressure Filters in Forklifts : using only pump motor currents and load pressure measurements