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（1 同濟(jì)大學(xué)結(jié)構(gòu)防災(zāi)減災(zāi)工程系， 上海 200092; 2 上海房地產(chǎn)科學(xué)研究院， 上海 200031）

［摘要］為改善傳統(tǒng)的單擺式調(diào)諧質(zhì)量阻尼器（PTMD）對(duì)頻率調(diào)諧敏感的缺點(diǎn)，提出了一種自變頻單擺式調(diào)諧質(zhì)量阻尼器（SA-PTMD），SA-PTMD由擺繩、質(zhì)量塊、阻尼器和伺服控制系統(tǒng)構(gòu)成。伺服控制系統(tǒng)包含一個(gè)加速度計(jì)、控制中樞的微電路板和調(diào)節(jié)擺長(zhǎng)的步進(jìn)電機(jī)。電路板根據(jù)主結(jié)構(gòu)的加速度信號(hào)，通過(guò)Hilbert-Huang變換（HHT）計(jì)算得到主結(jié)構(gòu)的瞬時(shí)頻率，控制步進(jìn)電機(jī)實(shí)時(shí)調(diào)節(jié)PTMD的擺長(zhǎng)以調(diào)諧其自振頻率。介紹了SA-PTMD的機(jī)械組成和安裝方式及基于HHT的變擺長(zhǎng)控制算法。給出了一個(gè)數(shù)值模擬算例，在算例中，對(duì)比了無(wú)TMD,PTMD,SA-PTMD控制下模型在簡(jiǎn)諧激勵(lì)和脈動(dòng)風(fēng)激勵(lì)下的加速度和位移響應(yīng)。結(jié)果表明，SA-PTMD在PTMD頻率偏離主結(jié)構(gòu)頻率和激勵(lì)頻率偏離PTMD控制頻率時(shí)，均能實(shí)時(shí)調(diào)節(jié)自身頻率，降低主結(jié)構(gòu)的加速度和位移響應(yīng)。

［關(guān)鍵詞］自變頻單擺式調(diào)諧質(zhì)量阻尼器；  瞬時(shí)頻率識(shí)別； Hilbert-Huang變換； 簡(jiǎn)諧激勵(lì)； 脈動(dòng)風(fēng)激勵(lì)

中圖分類(lèi)號(hào)：TU352， TU317文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2020)21-0097-05

Research on vibration reduction effect of semi-active pendulum tuned mass damper

WANG Liangkun1, SHI Weixing1, LU Zheng1, WANG Hongtao2

（1 Department of Disaster Mitigation for Structures, Tongji University, Shanghai 200092, China;2 Shanghai Real Estate Science Research Institute, Shanghai 200031, China)

Abstract:In order to improve the shortcomings of traditional single pendulum tuned mass damper (PTMD) that are sensitive to frequency tuning, a semi-active pendulum tuned mass damper (SA-PTMD) was proposed. SA-PTMD consists of the swing rope, mass block, damper and servo control system. The servo control system includes an accelerometer, a control center micro-circuit board and a stepping motor for adjusting the pendulum length. The circuit board calculates the instantaneous frequency of the main structure through Hilbert-Huang transform (HHT) according to the acceleration signal of the main structure, and controls the stepper motor to adjust the PTMD′s pendulum length in real time to tune its natural frequency. The mechanical composition, installation method  of the SA-PTMD  and variable pendulum length control algorithm based on HHT were introduced. A numerical simulation case was given, in the case, the acceleration and displacement responses of the model under harmonic excitation and pulsating wind excitation under control conditions of without TMD, PTMD and SA-PTMD were compared. The results show that when the PTMD frequency deviates from the main structure frequency and the excitation frequency deviates from the PTMD control frequency, SA-PTMD can adjust its own frequency in real time and reduce the acceleration and displacement response of the main structure.

Keywords:semi-active pendulum tuned mass damper;  instantaneous frequency identification; Hilbert-Huang transform; harmonic excitation; pulsating wind excitation

*國(guó)家自然科學(xué)基金項(xiàng)目(51922080)，上海市優(yōu)秀學(xué)術(shù)帶頭人計(jì)劃(20XD1423900)。