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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 馬小康 | |
dc.contributor.author | Yen-Feng Li | en |
dc.contributor.author | 李彥鋒 | zh_TW |
dc.date.accessioned | 2021-06-16T06:32:20Z | - |
dc.date.available | 2014-08-08 | |
dc.date.copyright | 2014-08-08 | |
dc.date.issued | 2014 | |
dc.date.submitted | 2014-08-06 | |
dc.identifier.citation | 1. N. Narendran, Y. Gu, Life of LED-Based White Light Sources, Journal of Display Technology 1 (2005) 167-171.
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dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/56981 | - |
dc.description.abstract | 在本研究中,多重壓電磁力風扇冷卻系統分別應用於以下兩個模組,模組 A:LED用散熱鰭片和模組B:PC用散熱鰭片。多重壓電磁力風扇冷卻系統是由一個壓電風扇和兩個磁力扇葉所組成的,在結合了壓電效應、磁鐵同級互斥效應、共振效應三者之後,藉由葉片的快速震動,多重壓電磁力風扇冷卻系統可以產生強制對流的效果。
實驗結果顯示,運用碳纖維布料作為磁力風扇扇葉的材料,具有更高的楊氏係數和低密度的優勢,在25W的LED熱源之下,PVC材質的風扇熱阻為1.13℃/W,而碳纖維材質的風扇熱阻為0.82℃/W,透過材質的更動,有效降低了27.4%的熱阻,證明碳纖維片確實是良好的扇葉材質,散熱的表現足以取代原本使用的PVC材質。 模組A運用T型扇葉的設計後,LED的表面溫度從68.7℃下降到45.2℃, 葉片(a)非T型葉片設計達到3.64℃/W的熱阻,M_p為168.6%,葉片(b)T型葉片達到2.47℃的熱阻,M_p為371.4%,相較之下,T型葉片的設計可以額外降低32.1%的熱阻。 模組B運用麥拉片與碳纖維片的複合葉片概念,可以有效地提升共振頻率,在最佳化的複合比例2:8和3:7之下,熱阻值達到1.4℃/W,M_p為165.8%,T型葉片和增加額外磁力的效益也有探討。 | zh_TW |
dc.description.abstract | In this study, multiple piezoelectric-magnetic fans cooling system is applied on the thermal management of Light-emitting diodes lamp (module A) and CPU chip(module B). The multiple piezoelectric-magnetic fans system composed of one piezoelectric fan and two magnetic blades. By applying the piezoelectric effect, magnetic effect and resonance effect, multiple piezoelectric-magnetic fans system induces force convection by fast vibration.
The experimental results show the application of carbon fiber sheet as magnetic fan have the advantage of higher Young’s modulus and low density. The thermal resistance is 0.82℃/W comparing with the PVC performance of 1.13℃/W under 25W LEDs lighting. Changing the material for blade can decrease the thermal resistance by 27.4%. Carbon fiber sheet is proved to be a nice choice for blade to replace the original usage of PVC. In module A with T shape blade design, the temperature of LEDs substrate can drop from 68.7℃ to 45.2℃. The thermal resistance with T shape blade design is 2.47℃/W comparing with no T shape blade design of 3.64℃/W. T shape blade design can decrease the thermal resistance by 32.1% In module B, the combination of mylar and carbon fiber increases resonance frequency. The optimum ratio is 2:8 and 3:7 whose thermal resistance is 1.4℃/W. The efficiency of T shape blade design and extra magnetic force are also tested in this module. | en |
dc.description.provenance | Made available in DSpace on 2021-06-16T06:32:20Z (GMT). No. of bitstreams: 1 ntu-103-R01522310-1.pdf: 2308085 bytes, checksum: 9fad337e4cfedaf88a4fc4cfbdcef754 (MD5) Previous issue date: 2014 | en |
dc.description.tableofcontents | 致謝 I
摘要 II Abstract III 目錄 IV 圖目錄 VII 表目錄 X 符號說明 XI 第一章 緒論 1 1.1前言 1 1.2 LED簡介 2 1.3常見電子元件散熱技術 3 1.4文獻回顧 6 1.4.1早期壓電散熱 6 1.4.2頻率與振幅參數研究 6 1.4.3多片壓電風扇使用 8 1.5研究動機 9 1.6研究目標 10 第二章 散熱鰭片內置系統 11 2.1壓電材料 11 2.2壓電風扇特性 12 2.3壓電風扇結構 13 2.4磁力連動壓電風扇 13 2.4.1連動原理 14 2.4.2共振運作 15 2.4.3熱對流係數與熱阻計算 15 2.5 系統設計 18 2.5.1 複合葉片 19 2.5.2 模組A:LED用散熱鰭片 19 2.5.3 模組B:PC用散熱鰭片 20 第三章 實驗量測架構 21 3.1實驗參數 21 3.1.1葉片材質 21 3.1.2葉片形狀 23 3.1.3複合葉片比例 24 3.1.4驅動磁力強度 26 3.2實驗架設 28 3.2.1葉片材質比較 28 3.2.2模組A:LED用散熱鰭片 29 3.2.3 模組B:PC用散熱鰭片 30 3.3實驗儀器 30 3.3.1溫度量測 30 3.3.2訊號產生 31 3.3.3熱源輸出 31 3.4材料特性 32 第四章 結果與討論 33 4.1不同葉片材質之影響 33 4.2模組A:LED用散熱鰭片 34 4.2.1不同扇葉形狀及面積之影響 34 4.2.2不同輸入功率之影響 35 4.2.3不同電壓供給之影響 35 4.3模組B:PC用散熱鰭片 37 4.3.1複合材料比例之影響 37 4.3.2不同驅動磁力強度之影響 39 4.3.3不同扇葉形狀及面積之影響 41 第五章 結論與建議 43 5.1研究結論 43 5.2建議與未來展望 46 參考文獻 47 | |
dc.language.iso | zh-TW | |
dc.title | 壓電風扇模組內置於散熱鰭片之研究 | zh_TW |
dc.title | The Study of Multiple Piezoelectric-Magnetic Fan System in the Interior of Heat Sink | en |
dc.type | Thesis | |
dc.date.schoolyear | 102-2 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 蔣本基,顏溪成,王興華 | |
dc.subject.keyword | 壓電風扇,冷卻,T型葉片,強制對流,散熱鰭片, | zh_TW |
dc.subject.keyword | piezoelectric-magnetic fans,cooling,T shape blade,forced convection,heat sink, | en |
dc.relation.page | 79 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2014-08-06 | |
dc.contributor.author-college | 工學院 | zh_TW |
dc.contributor.author-dept | 機械工程學研究所 | zh_TW |
顯示於系所單位: | 機械工程學系 |
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