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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 黃心豪 | zh_TW |
| dc.contributor.advisor | Hsin-Haou Huang | en |
| dc.contributor.author | 陳品傑 | zh_TW |
| dc.contributor.author | Pin-Chieh Chen | en |
| dc.date.accessioned | 2024-12-24T16:30:03Z | - |
| dc.date.available | 2024-12-25 | - |
| dc.date.copyright | 2024-12-24 | - |
| dc.date.issued | 2024 | - |
| dc.date.submitted | 2024-12-02 | - |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/96354 | - |
| dc.description.abstract | 振動在工程中扮演至關重要的角色，振動對伺服器的負面影響近年來備受矚目。本研究聚焦於振動抑制的關鍵問題，並應用了一種新興方法，即超穎材料局部共振的應用，以改善伺服器中的硬碟存儲性能。超穎材料是一種人造材料，其特殊的結構設計使其能夠在如電磁波、聲波、振動波或其他波動的控制方面具有特殊的性能。利用局部共振的減振機制，能夠在特定頻率範圍內形成帶隙，用於抑制特定頻率的振動，降低振動傳遞和振幅，並有效地減少振動對結構的不利影響。本研究中，已知目標伺服器易受到300~400 Hz來自冷卻風扇振動的主頻及其倍頻之影響，利用局部共振的原理，設計出適合目標伺服器之幾何限制的局部共振子，並且藉由實驗驗證共振子具有良好的效果，相較原始機台情況，加了共振子的伺服器在頻譜密度圖的峰值振動下降了50%，硬碟讀寫效率經過測試提升了10%以上。 | zh_TW |
| dc.description.abstract | Vibration plays a crucial role in engineering, and the negative impact of vibrations on servers has gained significant attention in recent years. This study focuses on the critical issue of vibration suppression and applies an emerging method involving the application of local resonance in metamaterials to enhance hard drive storage performance in servers. Metamaterials are artificial materials whose unique structural design enables them to exhibit special properties in controlling waves, such as electromagnetic waves, sound waves, vibration waves, and other forms of vibrations. By leveraging the damping mechanism of local resonance, band gaps can be created within specific frequency ranges to suppress vibrations at those frequencies, reduce vibration transmission and amplitude, and effectively mitigate adverse effects on structures. In this study, it is known that the target server is particularly susceptible to the primary frequency vibrations of 300~400 Hz from cooling fans and their harmonics. Using the principle of local resonance, we designed local resonators suited to the geometric constraints of the target server. Experimental verification showed that these resonators significantly reduced peak vibration in the power spectral density by 50% and improved hard drive read/write efficiency by over 10% compared to the original server setup. | en |
| dc.description.provenance | Submitted by admin ntu (admin@lib.ntu.edu.tw) on 2024-12-24T16:30:03Z No. of bitstreams: 0 | en |
| dc.description.provenance | Made available in DSpace on 2024-12-24T16:30:03Z (GMT). No. of bitstreams: 0 | en |
| dc.description.tableofcontents | 口試委員會審定書 i
謝辭 ii 中文摘要 iii 英文摘要 iv 目次 v 圖次 ix 表次 xiii 名詞對照 xiv 符號說明表 xvi 第一章 緒論 1 1.1 研究動機 1 1.2 研究背景 2 1.3 研究目的 2 1.4 重要性與貢獻 5 1.5 研究流程 6 第二章 文獻探討 8 2.1 超穎材料 8 2.2 局部共振子 8 2.3 梁超穎共振子結構 10 2.4 其他共振子結構 12 2.4.1 非線性共振子 12 2.4.2 軟材料共振子 13 2.4.3 局部共振子結合聲學黑洞 14 2.4.4 摺紙超穎結構 15 第三章 研究方法 16 3.1 頻散方程式 16 3.2 局部共振 18 3.3 超穎結構設計方法 19 3.4 超穎共振子單元 20 3.4.1 彈簧質量共振子與梁型共振子 20 3.4.2 質量補償結構 23 3.5 模擬設置與研究模組 24 3.5.1 頻域研究模組 24 3.5.2 特徵頻率研究模組 24 3.5.3 固定約束 25 3.5.4 受迫運動 25 3.5.5 薄彈性層 25 3.5.6 單元測試模擬邊界條件設置 26 3.5.7 模擬頻散圖繪製方法 26 3.5.8 頻率響應函數模擬設置與方法 28 3.6 振動量測及數據處理 28 3.6.1 快速傅立葉轉換 29 3.6.2 振動量測的數據處理方式 30 3.6.3 頻率響應函數 32 3.6.4 權重因子 33 3.7 實驗方法 34 3.7.1 奈奎斯特採樣定理 34 3.7.2 共振子單元自然頻率測試 34 3.7.3 伺服器振動實驗 35 3.7.4 硬碟讀寫效率實驗 36 3.8 實驗設備介紹 37 3.8.1 伺服器 37 3.8.2 硬碟 38 3.8.3 加速度規安裝裝置 38 3.8.4 振動量測儀器 38 3.8.5 受迫振動輸入訊號儀器 39 第四章 超穎共振子結構實驗及模擬驗證結果 40 4.1 超穎共振子頻散分析 40 4.2 單元測試結果 44 4.2.1 彈簧質量共振子自然頻率測試結果 44 4.2.2 梁型共振子頻率調控驗證 47 4.2.3 梁型共振子自然頻率測試結果 48 4.2.4 彈簧質量共振子與梁型共振子單元測試比較 49 4.3 伺服器振動量測實驗結果 51 4.3.1 彈簧質量共振子 51 4.3.2 針對風扇主頻率之梁型共振子 53 4.3.3 針對硬碟敏感頻率之梁型共振子 55 4.4 IOPS實驗結果 57 4.4.1 彈簧質量共振子 57 4.4.2 針對風扇主頻率之梁型共振子 59 4.4.3 針對硬碟敏感頻率之梁型共振子 61 第五章 超穎共振子結構討論 64 5.1 質量彈簧共振子數量討論 64 5.1.1 共振子數量對振動及硬碟讀寫效率的影響 64 5.1.2 不同間距的彈簧質量共振子對硬碟讀寫效率討論 66 5.2 梁型共振子數量討論 67 5.3 週期性及頻率響應模擬討論 69 5.3.1 不同列數討論 69 5.3.2 相同列數不同位置的討論 71 5.4 共振子尺寸討論 72 5.5 阻尼大小對減振能力討論 73 5.6 彈簧質量共振子重要參數對頻率的影響討論 75 5.7 梁型共振子重要參數對頻率的影響討論 76 5.8 磁鐵對伺服器的影響討論 77 第六章 結論與未來展望 79 6.1 結論 79 6.2 未來展望 80 參考文獻 81 附錄 87 | - |
| dc.language.iso | zh_TW | - |
| dc.title | 基於局部共振帶隙及可變頻率設計的共振子在伺服器的振動控制 | zh_TW |
| dc.title | Vibration Control in Servers Using Resonators with Local Resonance Bandgaps and Tunable Frequency Design | en |
| dc.type | Thesis | - |
| dc.date.schoolyear | 113-1 | - |
| dc.description.degree | 碩士 | - |
| dc.contributor.oralexamcommittee | 宋家驥;陳伯修;施文彬;周光武 | zh_TW |
| dc.contributor.oralexamcommittee | Chia-Chi Sung;Po-Hsiu CHEN;Wen-Pin Shih;Kuang-Wu Chou | en |
| dc.subject.keyword | 局部共振,頻散方程式,伺服器,硬碟性能,振動隔離,超穎材料, | zh_TW |
| dc.subject.keyword | Local resonance,dispersion equation,server,hard drive performance,vibration isolation,metamaterials, | en |
| dc.relation.page | 103 | - |
| dc.identifier.doi | 10.6342/NTU202404661 | - |
| dc.rights.note | 未授權 | - |
| dc.date.accepted | 2024-12-03 | - |
| dc.contributor.author-college | 工學院 | - |
| dc.contributor.author-dept | 工程科學及海洋工程學系 | - |
| 顯示於系所單位： | 工程科學及海洋工程學系 | |
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