مهندسی سازه و ساخت

مهندسی سازه و ساخت

استخراج پارامترهای بهینه و ارزیابی عملکرد سیستم دارای قابلیت خودکنترلی با تحلیل‏های حوزه فرکانس و زمان

نوع مقاله : علمی - پژوهشی

نویسنده
استادیار، گروه مهندسی عمران، دانشگاه آزاد اسلامی واحد خورموج، خورموج، ایران
چکیده
سیستم‎های سازه‎ای با قابلیت خودکنترلی مثل سازه بلند با بخش‎های معلق جدا شده یا سیستم مگاساب کنترل‎شده که در آن‎ها بخشی از سازه اصلی به عنوان زیرسازه جاذب ارتعاش عمل می‎کند، در سال‎های اخیر پیشنهاد شده و مورد توجه قرار گرفته‎اند. در این تحقیق، قابلیت کنترل سیستم خودکنترل با ارائه مدل مفهومی دو درجه آزادی با سیستم اولیه میرا تحت تحریک تصادفی نوفه سفید مورد بررسی قرار گرفت. هدف کنترل به نحوی انتخاب شد که ارتعاشات هر دو جرم کنترل شود و پارامترهای بهینه و عملکردهای کنترلی سیستم خودکنترل و TMD با استفاده از تحلیل حوزه فرکانس مقایسه شد. همچنین، ارتعاش جرم‎ها با تحلیل حوزه زمان نیز بررسی گردید. برای ارزیابی نقش روش خودکنترلی در کاهش ارتعاشات سازه‎ها و مقایسه عملکرد آن‏ها با مدل مفهومی، مثالی از ساختمان بلند در معرض باد ارائه و بررسی شد. نتایج نشان داد کارآیی سیستم خودکنترلی با افزایش نسبت جرمی بیشتر می‎شود. به‎طور مثال، در مدل مفهومی، برای نسبت جرمی 30 درصد، جایجایی نسبت به حالت کنترل نشده، 7/70 درصد کاهش داشت. تحلیل حوزه زمان نشان داد در سیستم خودکنترل، ارتعاشات جرم‏های اولیه و ثانویه مشابه هستند ولی نسبت به هم اختلاف فاز دارند که زمینه را برای کاهش ارتعاشات توسط میراگر فراهم می‎کند. برای ساختمان بلند، سیستم خودکنترلی نقش موثری در کنترل ارتعاشات سازه به‏ویژه نوسانات عرضی که غالب‎تر از ارتعاشات طولی بود، داشت. پارامترهای بهینه پاسخ طولی ساختمان در مقایسه با پاسخ عرضی، به پارامترهای مدل مفهومی نزدیک‏تر بود. برای ساختمان بلند، ارائه مدل سازه‏ای و بارگذاری دقیق‎تر، با نتایج بهینه‏سازی مطلوب‎تری همراه بود.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Extracting optimal parameters and evaluating the performance of the self-control system using frequency and time domain analyses

نویسنده English

Namat Khodaie
Assistant Professor, Civil Engineering Department, Islamic Azad University Khormuj Branch, Khormuj, Iran
چکیده English

Structural systems with self-control capabilities, such as tall buildings with isolated suspended parts or controlled Mega-Sub systems, in which a part of the main structure acts as a vibration-absorbing substructure, have been proposed and noticed in recent years. In this research, the control performance of the self-control system was investigated by presenting a two-degree-of-freedom conceptual model with the primary damped mass under the white-noise random excitation and the vibrations of both masses are controlled. The optimal parameters and control performance of self-control system and TMD were compared using the frequency-domain analysis, and the vibration of the masses was also obtained with time-domain analysis. An example of a tall building under wind loads was presented and analyzed. The results showed that the efficiency of the self-control system increases with mass ratio. For example, in the conceptual model, for a mass ratio of 30%, the displacement was reduced by 70.7% compared to the uncontrolled state. The time-domain analysis showed that in the self-control system, the vibrations of the two masses are similar, but they have a phase difference, which provides the basis for controlling the vibrations by the damper. For the tall building, the self-control system played an effective role in controlling the structure's vibrations, especially the crosswind direction, which were more dominant than the along-wind vibrations. The optimal parameters of the along-wind response compared to the crosswind one were closer to the parameters of the conceptual model. For the tall building, providing a more accurate structural model and loading was associated with more favorable optimization results.

کلیدواژه‌ها English

Dynamic vibration absorber
Random vibration
Self-control ability
Passive control
Optimization
[1] Anh N D, Nguyen N X and Hoa L T (2013) Design of three-element dynamic vibration absorber for damped linear structures.  Journal of Sound and Vibration 332:4482–4495.
[2] Ormondroyd J and Den Hartog J P (1928) The theory of the dynamic vibration absorber. ASME Journal of Applied Mechanics 50(7) 9-22.
[3] Hahnkamm E (1932) Die dampfung von fundaments-chwingungen bei veranderlicher erregergrequenz.  Ing Arch. 4:192–201.
[4] Brock J E (1946) A note on the damped vibration absorber. ASME Journal of Applied Mechanics 13(4): A-284.
[5] Crandall S H and Mark W D (1963) Random vibration in mechanical systems. Academic Press, New York.
[6] Warburton G B (1981) Optimum absorber parameters for minimizing vibration response. Earthquake Engineering and structural Dynamics 9:251–262.
[7] Warburton G B (1982) Optimum absorber parameters for various combinations of response and excitation parameters. Earthquake Engineering and structural Dynamics 10:381–401.
[8] Nishihara O and Asami T (2002) Closed-Form Solutions to the Exact Optimizations of Dynamic Vibration Absorbers (Minimizations of the Maximum Amplitude Magnification Factors). Journal of Vibration and Acoustics 124(4): 576-582.
[9] Viana F A C, Kotinda G I, Rade D A and SteffenJr V (2008), Tuning dynamic vibration absorbers by using ant colony optimization. Computers & Structures 86(13–14): 1539–1549.
[10] Brown B and Singh T (2011) Minimax Design of Vibration Absorbers for Linear Damper Systems. Journal of Sound and Vibration 330: 2437–2448.
[11] Tigli O F (2012) Optimum vibration absorber (tuned mass damper) design for linear damped systems subjected to random loads. Journal of Sound and Vibration 331:3035–3049.
[12] Etedali S, Akbari M, & Seifi M, (2019). MOCS-based optimum design of TMD and FTMD for tall buildings under near-field earthquakes including SSI effects. Soil Dynamics and Earthquake Engineering, 119, 36–50.
[13] Hosseinaei S, Ghasemi M R, Etedali S, Optimal Design of Passive and Active Control Systems in Seismic-excited Structures Using a New Modified TLBO, Periodica Polytechnica Civil Engineering, 65(1), pp. 37–55, 2021.
[14] Etedali S, & Mollayi N, (2018), Cuckoo Search-Based Least Squares Support Vector Machine Models for Optimum Tuning of Tuned Mass Dampers, International Journal of Structural Stability and Dynamics, 18(02), 1850028.
[15] Yang, F., Sedaghati, R. and Esmailzadeh, E., (2022), Vibration suppression of structures using tuned mass damper technology: A state-of-the-art review, Journal of Vibration and Control, 28(7-8):812-836.
[16] Khodaie N., (2020), Vibration control of super-tall buildings using combination of tapering method and TMD system, Journal of Wind Engineering & Industrial Aerodynamics 196, 104031.
[17] Elias, S., Matsagar, V., & Datta, T. K., (2019), Along-wind response control of chimneys with distributed multiple tuned mass dampers. Structural Control and Health Monitoring, 26(1), e2275
[18] He, Y. C., & Li, Q., (2014), Dynamic responses of a 492-m-high tall building with active tuned mass damping system during a typhoon. Structural Control and Health Monitoring, 21(5), 705-720.
[19] Zhou, K., Li, Q.-S., & Li, X., (2020), Dynamic Behavior of Supertall Building with Active Control System during Super Typhoon Mangkhut, Journal of Structural Engineering, 146(5), 04020077.
[20] Feng M Q and Mita A (1995) Vibration control of tall buildings using mega sub configuration. Journal of Engineering Mechanics 121(10):1082–1088.
[21] Zhang X, Qin X, Cherry S, Lian L, Zhang J and Jiang J A (2009) New Proposed Passive Mega-Sub Controlled Structure and Response Control , Journal of  Earthquake Engineering 13: 252–274.
[22] Zhang X, Zhang J L, Wang D and Jiang J S (2005), Controlling characteristics of passive mega-sub controlled frame subjected to random wind loads, Journal of Engineering Mechanics, 131(10): 1046–1055
[23] Limazie T, Zhang X and Wang X (2013), Vibration control parameters investigation of the Mega-Sub Controlled Structure System (MSCSS). EARTHQ. STRUCT. 5(2): 225-237.
[24] Wang Ch, Lü Z and Tu Y (2011), Dynamic Responses of Core-Tubes with Semi-Flexible Suspension Systems Linked by Viscoelastic Dampers under Earthquake Excitation. Advances in Structural Engineering 14(5): 801-813.
[25] Liu Y and Lu Z (2014), Seismic Performance and Story-Based Stability of Suspended Buildings. Advances in Structural Engineering 17(10) 1531-1550.
[26] Moon K (2009), Tall Building Motion Control Using Double Skin Facades. Journal of Architectural Engineering 15(3): 84–90.
[27] Makino A, Imamiya J and Sahashi N (2008), Seismic vibration control of a high-rise R.C. building by a large tuned mass damper utilizing whole weight of the top floor. The 14th World Conference on Earthquake Engineering, Beijing, China.
[28] Kalehsar H.E., Khodaie N, (2018), Optimization of Response of a Dynamic Vibration Absorber Forming Part of the Main System by the Fixed-point Theory. KSCE J Civ Eng 22, 2354–2361.
[29] Deodatis G (1996), Simulation of ergodic multivariate stochastic processes, Journal of engineering mechanics, 122, 778–787

  • تاریخ دریافت 06 مرداد 1403
  • تاریخ بازنگری 12 آذر 1403
  • تاریخ پذیرش 11 دی 1403