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題名 | Dynamic Control of Active and Passive Constrained Layer Damping Treatments on A Cylindrical Shell=圓柱殼具主動及被動拘束阻尼層之比較 |
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作者 | 陳林宏; 黃世欽; | 書刊名 | 中國機械工程學刊 |
卷期 | 20:4 1999.08[民88.08] |
頁次 | 頁385-397 |
分類號 | 446.12 |
關鍵詞 | 圓柱殼具; 被動拘束阻尼層; 主動式拘束阻尼層; PCLD; ACLD; Passive constrained layer damping; Active constrained layer damping; Active control; Proportional feedback; Derivative feedback; |
語文 | 英文(English) |
中文摘要 | 本文將對圓柱殼具有被動式拘束阻尼層(PCLD)、主動式拘束阻尼層(ACLD)及 主動控制 (AC) 之阻尼效應作一比較。 在理論推導方面, 應用薄殼及 Donnell-Mushatri- Vlasov 理論,並用假設模態法來離散系統之能量式。 在控制法則方面,本研究應用位移及 速度回饋來作 ACLD 及 AC 之控制。在數值分析方面,首先找出最佳的覆蓋寬度及高度比, 再用此條件進行 PCLD、ACLD 及 AC 之比較。結果顯示 PCLD、ACLD 及 AC 均能增加系統之 阻尼效應, 且如所預期地,ACLD 比 PCLD 有較佳之阻尼效果; 在低的控制增益值時 ACLD 呈現較 AC 好的阻尼效果,然由於黏彈層之減緩控制力, 當增益值持續增加時,AC 之阻尼 終會高過 ACLD。 在自然頻率方面,PCLD 及 ACLD 均由於黏彈材料層 (VEM) 的影響造成自 然頻率降低,而 AC 則提高了系統的自然頻率。本文之理論模式與分析結果可以提供工程師 有價值之資料,作為拘束阻尼層設計之參考。 |
英文摘要 | This paper presents the comparison of a cylindrical shell with passive constrained layer damping (PCLD), active constrained layer damping (ACLD) and active control (AC). A thin shell theory in conjunction with the Donnell-Mushtari- Vlasov assumptions is employed to yield models for all cases. Employing the assumed-mode method to the discrete expression of energy, results in the derivation of the equations of motion. The control laws employed for ACLD and AC are the proportional and the derivative feedback. First, the best selections of coverage length and thickness ratio are determined. The comparison of damping effect of PCLD, ACLD and AC are discussed. The numberical results indicate that all three types of treatment can impose effective damping to shell structure. ACLD, as expected, shows better damping than PCLD. In addition ACLD reduces the control actuation and produces less damping at high control gain when compared to the AC case. The shell's natural frequencies are latered by each of the treatments. ACLD and PCLD decrease the natural frequencies because of their effect in the viscoelastic material (VEM) layer. However AC treatment, increases the natural frequencies. The presented results are contended to provide engineers with useful information for assessing damping effects in different treatments. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。