- 摘 要
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(1 天津大學(xué)航空航天研究院，天津 300072； 2 天津大學(xué)建筑工程學(xué)院，天津 300072)
［摘要］研究了磁流變(MR)阻尼器控制力幅值對結(jié)構(gòu)半主動控制效果的影響。建立了多自由度結(jié)構(gòu)MR阻尼器控制系統(tǒng)的運(yùn)動方程，根據(jù)最優(yōu)控制算法和半主動控制率提出了MR阻尼器控制力幅值的取值方法，最后仿真分析了不同的幅值取值方法對結(jié)構(gòu)半主動控制效果的影響。研究表明，隨MR阻尼器控制力幅值的增大，會出現(xiàn)控制效果趨于穩(wěn)定的平臺區(qū)段，在平臺范圍內(nèi)降低MR阻尼器的控制力幅值，并不會明顯降低結(jié)構(gòu)的控制效果。降低后的控制力幅值可以減小MR阻尼器的設(shè)計(jì)尺寸，更便于阻尼器在工程上的應(yīng)用。研究還表明，對于控制力幅值已定的MR阻尼器，適當(dāng)減小權(quán)矩陣系數(shù)比，使控制效果曲線較晚進(jìn)入平臺區(qū)段，也可達(dá)到提高結(jié)構(gòu)響應(yīng)控制效果的目的。
［關(guān)鍵詞］磁流變(MR)阻尼器；半主動控制；半主動控制率；控制力幅值；最優(yōu)控制算法
Influence of control force amplitude of MR damper on semi-ctive control effects
Jiang Nan1, Li Zhongxian2(1 Institute of Aeronautics and Astronautics, Tianjin University, Tianjin 300072，China;2 School of Civil Engineering, Tianjin University, Tianjin 300072, China)
Abstract:The influence of control force amplitude of magnetorheological (MR) damper on semi-ctive control effects is discussed. The motion equations of the MR damper control system with multi-reedom degrees structure are established. The method of determining the amplitude of control force of MR damper is presented based on the optimal control algorithm and the sei-ctive control strategy. The effect of different methods of determining the amplitude of control force to semi-ctive control effects is analyzed in calculation examples. The results show that a steady flat section appears with the increasing of the amplitude of control force. In this section decreased amplitude of control force with less losing in control effects can reduce the designed dimension of MR damper for its convenient application in engineering. The plat section of control effects curve may appear later and control effects can be improved by minishing the ratio of weight matrix for those MR dampers with fixed amplitude of control force.
Keywords:magnetorheological (MR) damper; semi-ctive control; strategy; control force amplitude; optimal control algorithm
*國家杰出青年科學(xué)基金(50425824)，國家自然科學(xué)基金重大研究計(jì)劃(90715032)。作者簡介：姜南，講師，Email: wwwjiangnan@yahoo.com.cn。
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