Ferrography—then and now

Roylance, B. J.

doi:10.1016/j.triboint.2005.03.006

Cited by 112 publications

(49 citation statements)

References 14 publications

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“…However, these procedures are time consuming and require relevant laboratory apparatus. Therefore, when evaluating the current lubricant state and its residual durability, we use instrumentation methods, such as Fourier Transform Infrared Spectrometry (FTIR Spectrometry) (Glos and Svoboda, 2015;Hnilicová et al, 2016;Král et al, 2014;Sejkorová et al, 2014) combined with chemometric software (Al-Ghouti et al, 2010;Caneca et al, 2006;Sejkorová, 2013;Van de Voort et al, 2006), electro-chemical methods (Tomášková et al, 2014), emission and absorption spectrometry (Glos and Sejkorová, 2012;Mihalčová, 2014;Kumbár et al, 2014), a particle analysis using particle counters (Juránek et al, 2011;Kučera et al, 2016), and ferrography (Mihalčová and Rimár, 2015;Machalíková et al, 2008;Roylance, 2005).…”

Section: Introductionmentioning

confidence: 99%

Analysis of Degradation of Motor Oils Used in ZETOR Tractors

Sejkorová

Glos

2017

Acta Univ. Agric. Silvic. Mendelianae Brun.

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The durability of motor oil and then the change interval are influenced by numerous factors and it is not easy to determine optimal mileage for a specific means of transport or a machine. The manufacturer proposes a maximum limit, but it is not always suitable since operating conditions influence the process significantly. Using FTIR spectrometry and analytical ferrography methods we evaluated used motor oils collected from older types of ZETOR tractors. Change intervals were extended for most tested oil fills. The analysis results showed that when the tractors were exposed to a considerable everyday load during autumn tasks, the lubrication and friction processes in their motors were affected negatively which resulted in increased wear. Therefore it is not advisable to extend the change interval as proposed by the ZETOR manufacturer.

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Section: Introductionmentioning

confidence: 99%

Analysis of Degradation of Motor Oils Used in ZETOR Tractors

Sejkorová

Glos

2017

Acta Univ. Agric. Silvic. Mendelianae Brun.

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“…The study of wear debris particles is known as ferrography and was first introduced by Seifert and Westcott (1972). Since then, the science has evolved and helped to understand wear related phenomena (Roylance (2005)). These techniques are however intrusive and costly, requiring laboratory analyses.…”

Section: Introductionmentioning

confidence: 99%

Modeling and Identification of Wear in a Robot Joint under Temperature Uncertainties

Bittencourt

Axelsson

Jung

et al. 2011

IFAC Proceedings Volumes

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This paper considers the problem of wear estimation in a standard industrial robot joint. Motivated by the observation that the wear processes in a robot actuator cause an increase of the friction levels in the joint, static friction observations are used to infer the wear levels. An existing static friction model is extended to include the eects of wear, which are analyzed and modeled. The resulting model can explain friction in a robot joint with respect to changes in speed, load, temperature and wear. Based on this model and a test-cycle that generates static friction observations, a modelbased wear estimator is proposed. The performance of the estimator is found both by means of simulations and experiments on an industrial robot. As it is shown, the method can distinguish the eects of wear even under large temperature variations, opening up for the use of robust joint diagnosis for industrial robots. Abstract: This paper considers the problem of wear estimation in a standard industrial robot joint. Motivated by the observation that the wear processes in a robot actuator cause an increase of the friction levels in the joint, static friction observations are used to infer the wear levels.An existing static friction model is extended to include the effects of wear, which are analyzed and modeled. The resulting model can explain friction in a robot joint with respect to changes in speed, load, temperature and wear. Based on this model and a test-cycle that generates static friction observations, a model-based wear estimator is proposed. The performance of the estimator is found both by means of simulations and experiments on an industrial robot. As it is shown, the method can distinguish the effects of wear even under large temperature variations, opening up for the use of robust joint diagnosis for industrial robots.

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“…The function of support vector machine is used to calculate the target characteristics of primary vision, spectrum characteristics and statistical features. The kernel function uses RBF function and the cross validation method to carry out performance test [1].…”

Section: Workflowmentioning

confidence: 99%

“…Through the DSP encoding module, SIP signaling control module, RTP/ RTCP real-time data transmission module, DirectShow playback module, the use of third-party companies to provide digital video software development kit, SOC view of the analyzer, integrated development tools, Provide middleware, build embedded video surveillance platform. Through my eclipse build integrated development environment, built with sqlite3 embedded database, application HTTPD, apache-tomcat, JDK and other software, application JAVA component programming technology to create WEB server [1] [2].…”

Section: Hardware Designmentioning

confidence: 99%

Design of Visual Online Spectrometer Based on Support Vector Machine

Huang¹

2018

dtcse

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Abstract. Using the ARM and DSP dual core processor and H.264 algorithm to study the iron spectrum image classification technology, the typical oil sample image is scaled, stable and rotating, and a complete grinding grain sample library is established. By using a Vinci processor, H.264 encoding method, the Visual on-line iron spectrometer that can be used to monitor the visual line of the wear particles in the oil and meet the requirements of on-line oil monitoring is produced. The iron spectrometer is supporting vector machine and recognition accuracy are ideal.

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Ferrography—then and now

Cited by 112 publications

References 14 publications

Analysis of Degradation of Motor Oils Used in ZETOR Tractors

Analysis of Degradation of Motor Oils Used in ZETOR Tractors

Modeling and Identification of Wear in a Robot Joint under Temperature Uncertainties

Design of Visual Online Spectrometer Based on Support Vector Machine

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