單阻尼與對稱雙阻尼弦系統減振特性對比
首發時間:2023-10-20
摘要:為了探究雙阻尼弦系統的減振特性,推導其頻率方程,對可解析求解的情況--對稱三分位阻尼弦系統的頻率方程進行代數化,得到其本征值的閉合解,并與單三分位阻尼弦系統的閉合解進行對比?;?個系統閉合解的復域特征,分小阻尼和大阻尼2個區間討論其減振特性。結果表明:1)在不同的阻尼區間,2個系統的本征值表現出相同的共軛特性;2)對稱三分位阻尼弦系統的減振效果是單三分位阻尼系統的2倍;3)在小阻尼區間,無論2個系統處于哪一階運動狀態,均不會出現相同的頻率,且2個系統的頻率構成全體實數域,可為阻尼弦系統的頻率共振問題提供潛在的解決方案。
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Comparison of the attenuation characteristics of a taut string system with single damper and two symmetrical dampers
Abstract:To explore the vibration reduction characteristics of a taut string with two dampers, derive the frequency equation, the frequency equation in which dampers are located at symmetric one third of the string length that can be analytically solved is algebraized. The analytical solution of its eigenvalues is obtained, which is further compared with the analytical solution of a taut string with a damper in one third length. Based on the complex domain characteristics of the analytical solutions of the two systems, the vibration reduction characteristics are discussed in two intervals: small damping and large damping. The results indicate that: 1) In different damping intervals, the eigenvalues of the two systems exhibit the same conjugate characteristics. 2) The damping effect of a taut string with two dampers located at symmetric one third of the string length is twice as strict as a taut string with one damper located at one third of the string length. 3) In the small damping interval, the same frequency will not occur no matter in which order of motion the two systems are, and the frequencies of the two systems form the entire real number domain, which can provide potential solutions for the frequency resonance problem of damping string systems.
Keywords: taut string with two dampers concentrated damping eigen solution attenuation characteristics
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單阻尼與對稱雙阻尼弦系統減振特性對比
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