Identifications of Tribology Parameters of Pneumatic Cylinder for Passive Solar Tracker
碩士 === 明志科技大學 === 機械工程系機械與機電工程碩士班 === 102 === The researches and developments of the renewable energies are getting more and more important for the academic and industry nowadays which are the main streams and may to meet the energy needs for the whole world. Associating with the solar tracker the o...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2014
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| Online Access: | http://ndltd.ncl.edu.tw/handle/61034170151984165483 |
| Summary: | 碩士 === 明志科技大學 === 機械工程系機械與機電工程碩士班 === 102 === The researches and developments of the renewable energies are getting more and more important for the academic and industry nowadays which are the main streams and may to meet the energy needs for the whole world. Associating with the solar tracker the output power of the solar cells may be enhanced because of the facing the sun the solar cells give more intension on the photovoltaic effects. The active solar tracker which is actuated by an electric motor associating with the feedback sensor to detect the sunlight. This active solar tracker has drawbacks of energy depletion and the emission of huge amount of carbon dioxide. The passive solar tracker is thus more suitable for solar tracking since the tracking need energy free from the electricity. The Freon tanks of each sides of the solar cell absorb the sunlight. The pressures within the tanks are proportional to the sunlight by the photothermal conversion. Two chambers of the pneumatic cylinder may be indifference if the solar cell is not facing the sun. This indifference pressure makes the pneumatic cylinder to actuate the tracker. The stick-slip effect of pneumatic cylinder may affect the tracking accuracy which is caused by the tribology of pneumatic cylinder. Based on the LuGre model this study investigates the stick-slip effect of the pneumatic cylinder of the passive tracker. Identification of the tribology parameters of the LuGre model is the purpose of this thesis. Acquiring of the tribology parameters of the pneumatic cylinder filled with the Freon is useful for application of the solar tracking system. The solar tracker may be modified to deriving excellent system dynamic response based on the previous parapeters.
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