Zobrazeno 1 - 10 of 136 pro vyhledávání: '"Matti Linjama"'
1
Akademický článek
Analyzing the design and performance of a high flow rate digital flow control unit: Structural insights and simulation findings
Autor: Essam Elsaed, Matti Linjama
Publikováno v: Advances in Mechanical Engineering, Vol 16 (2024)
Digital hydraulics offers advantages over traditional proportional valves but lacks high flow rate performance. This study proposes a solution based on operated on/off valves. The proposed system achieved a flow rate of nearly 350 LPM at nominal oper
Externí odkaz: https://doaj.org/article/0477a57cc83545599741d3a62c88c7b9
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2
Akademický článek
Representation Learning for Detecting the Faults in a Wind Turbine Hydraulic Pitch System Using Deep Learning
Autor: Panagiotis Korkos, Jaakko Kleemola, Matti Linjama, Arto Lehtovaara
Publikováno v: Energies, Vol 15, Iss 24, p 9279 (2022)
Wind turbine operators usually use data from a Supervisory Control and Data Acquisition system to monitor their conditions, but it is challenging to make decisions about maintenance based on hundreds of different parameters. Information is often hidd
Externí odkaz: https://doaj.org/article/c996ceb6bed947689d505cd3a25645a8
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4
Fault Detection in a Wind Turbine Hydraulic Pitch System Using Deep Autoencoder Extracted Features
Autor: Panagiotis Korkos, Jaakko Kleemola, Matti Linjama, Arto Lehtovaara
Publikováno v: PHM Society European Conference. 7:261-268
A wind turbine is equipped with lots of sensors whose measurements are recorded by the supervisory control and data acquisition (SCADA) system and stored every 10 minutes. The pitch subsystem of a wind turbine is of critical importance as it presents
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::87bcc38bf40c864ed23dcdda2ff5d7d9
https://doi.org/10.36001/phme.2022.v7i1.3330
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5
Energy efficient throttling control of a multi-pressure system using a genetic algorithm and model predictive control
Autor: Matti Linjama, Mikko Huova
Publikováno v: Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering. 236:406-417
The energy efficiency of hydraulic cylinder drives can be increased by replacing the actuator with a multi-chamber cylinder, utilising multiple supply lines with unique pressures or a combination of the concepts. Previous studies have demonstrated si
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::effccd8e6e013a74d119610a2397853c
https://doi.org/10.1177/09596518211027713
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6
Control of Multi-Pressure Hydraulic Supply Line Using Digital Hydraulic Power Management System
Autor: Mikko Huova, Matti Linjama
Publikováno v: BATH/ASME 2022 Symposium on Fluid Power and Motion Control.
Multi-pressure hydraulic supply line, i.e., hydraulic bus enables efficient use of energy in multi-actuator systems of off-road machinery. Number of constant pressure supply lines, each providing unique pressure level, are routed to every actuator in
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a2978c8ea7a299c63e02643b36cbe726
https://doi.org/10.1115/fpmc2022-89366
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7
Digital Hydraulic Technology for Linear Actuation:A State of the Art Review
Autor: Matti Linjama, Torben Ole Andersen, Viktor Hristov Donkov, Morten Kjeld Ebbesen
Publikováno v: Donkov, V H, Andersen, T O, Linjama, M & Ebbesen, M K 2020, ' Digital Hydraulic Technology for Linear Actuation : A State of the Art Review ', International Journal of Fluid Power, vol. 21, no. 2 . https://doi.org/10.13052/ijfp1439-9776.2125
This paper analyses the current state of the art in linear actuation with digital hydraulics. Based on the differences in their aims the paper partitions the area into four actuation concepts – parallel valve solutions, single switching valve solut
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7e0162aa9f1acd12d793567e873af394
https://vbn.aau.dk/da/publications/d3ef8cb7-77e4-45a7-b118-6ed225cc56b9
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8
Investigation on positioning control strategy and switching optimization of an equal coded digital valve system
Autor: Matti Linjama, Gao Qiang, Yuchuan Zhu, Miika Paloniitty
This article concerns high accuracy positioning control with switching optimization for an equal coded digital valve system. Typically, pulse number modulation control cannot realize micro-positioning due to the characteristics of step-wise flow vari
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3b57dd31e4510c9cf7bad272fa1157dd
https://trepo.tuni.fi/handle/10024/135382
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9
Open-loop independent metering control of a multi-dof forwarder boom
Autor: Matti Linjama, Jyrki Tammisto, Mikko Huova
This study applies independent metering control in a forestry forwarder in order to improve its energy efficiency. The paper describes the control method, which enables smooth control mode switches and relatively accurate velocity tracking without po
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1215f48cd02758c1aee84686f8c9218f
https://trepo.tuni.fi/handle/10024/127897
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10
Variable speed digital hydraulic transformer–based servo drive
Autor: Matti Linjama
This article studies a digital hydraulic servo drive driven by a variable speed electric servomotor. Digital displacement control is implemented by using a two-port digital hydraulic power management system having six pistons and 18 on/off control va
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bc3517602aec6cbb2290814e058b9c94
https://trepo.tuni.fi/handle/10024/134822
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