多自由度可調變形狀記憶材料吸振器之設計與結構減振研究

Design and Measurement of a Multi Degrees-of-Freedom Tunable Vibration Absorber Consisted of Hybrid Smart Shape Memory Materials

陳俊元(Chun-Yuan Chen) ； 白崇安(Chung-An Pai) ； 李春穎(Chun-Ying Lee)

《中華民國振動與噪音工程學會論文集》 2013 (2013/06) Pp. 233-239

摘要

本文旨在研究形狀記憶合金（shape memory alloy，SMA）包覆高分子聚合物（shape memory polymer，SMP）套管製做之可調變吸振器（tunable vibration absorber）用於結構減振之設計與分析。本研究中，利用超彈性合金（superelastic alloys，SE）線，製作成螺旋彈簧形式，外包覆高分子聚合物製作成可調變吸振器，通過不同電流以控制溫度改變吸振器剛性及阻尼效果來減低激振器所產生的外界干擾效果，以達到可依擾動頻率調變減振功效。實驗結果顯示若以1.5A電流加熱包覆四層SMP吸振器可調第1模態頻率範圍61.6%。首先藉由頻譜分析儀擷取所建構之吸振器在不同電流下自然頻率與阻尼比，再利用有限元素軟體模擬實際超彈性合金線包覆高分子材料之半主動吸振器設計，推導適合的主結構模型，透過實驗找出不同振動頻率與振幅大小下的最佳減振效果所相應的電流值，達到高頻寬減振目的。

關鍵字

智慧型材料 ； 形狀記憶高分子材料 ； 超彈性記憶合金 ； 可調變吸振器

並列摘要

This study used hybrid smart materials- shape memory alloy core enclosed by shape memory polymer (SMP), to design a tunable vibration absorber for vibration reduction over a wide frequency range. The superelastic wire was trained into helical spring and sleeved with several layers of SMP to form the structural part of the absorber. Different electric currents were employed to control the heating and temperature of the shape memory materials in order to tune the dynamic characteristics of the absorber. The experimental results showed that using 1.5A current to heat the four SMP layers sleeved vibration absorber the adjustable 1st modal frequency range can reach 61.6%. After the assembling of absorber onto the main structure, the tunable capacity of the absorber under different control currents were measured. It was found that the modal frequency results from finite element simulation were within 10% error comparing with measurements.

並列關鍵字

Smart Materials ； Hybrid Shape Memory Materials ； Tunable Vibration Absorb