連接結構微振動傳遞機理實驗探究
發(fā)布時間：2019-04-10 12:55
【摘要】：由于外太空微小隕石的撞擊,太陽輻射壓力等復雜的環(huán)境背景因素以及姿態(tài)機動,衛(wèi)星變軌,載荷啟動與停止等等因素,經常會導致在軌衛(wèi)星產生相應的動力學響應,所引起相應的結構頻率高達1000Hz,幅值低于10-1g,這個過程被稱之為微振動干擾。螺栓連接和膠接連接作為航天器平臺中最常見的兩種連接方式,對微振動的傳遞起著非常重要的作用。早期的動力學研究中,常常將結合面看成是剛性接觸,即不存在相對運動,但是隨著研究的深入,人們發(fā)現,連接處的螺栓和樹脂膠是航天器平臺上無源阻尼和非線性剛度的主要來源。螺栓和膠接連接結構會影響整體結構的固有頻率,模態(tài)振型,阻尼等等,從而使其表現出非線性的力學特性,因此對螺栓以及膠接固定結合面進行深入研究具有尤為重要的現實意義。根據前人對連接界面滑移耗能現象的研究,在理論方面,本文對承受剪力螺栓連接件簡化模型的耗能公式進行了推導,得出了在該研究條件下,模型的力-相對位移解析表達式,并且通過Matlab軟件畫出了相應遲滯回線圖形,通過代入不同的壓強模型,最終得到耗能與激勵力,耗能與相對位移所存在的冪次方關系。為了得到相應加工試件的模態(tài)參數,即獲取結構的固有頻率、振型和阻尼比我對加工好的實驗試件進行了試驗模態(tài)分析。針對前面的理論分析,我還對相應的多組螺栓和膠接連接結構的實體試件進行了實驗方面的研究。實驗過程中,利用激振器來提供外界的激勵力,通過力傳感器,加速度傳感器,LMS數據采集系統(tǒng)來采集分析處理相應的信號。整個過程中,通過改變不同的扭矩,頻率,激勵力大小來對實驗試件進行對比實驗測試。最終獲取不同實驗條件下的加速度值和力值的數據。再利用Origin軟件對加速度數據進行兩次積分處理,得到位移數據,將數據最終進行匯總,相應的就可以得到螺栓和膠接連接結構的能量耗散與激勵力和相對位移的關系圖像,并與上面提到的理論公式進行對比分析,最終得出結論。
[Abstract]:Due to the impact of small meteorite in outer space, complex environmental background factors such as solar radiation pressure, attitude maneuver, satellite orbit change, load start-up and stop, and so on, it often leads to the corresponding dynamic response of in-orbit satellites. The frequency of the structure is as high as 1000 Hz and the amplitude is less than 10 渭 g. This process is called micro-vibration interference. As the two most common connecting modes of spacecraft platform, bolted connection and glued joint play a very important role in the transmission of micro-vibration. In the early study of dynamics, the interface is often regarded as rigid contact, that is, there is no relative motion, but with the deepening of the study, people find that, The bolt and resin glue at the joint are the main sources of passive damping and nonlinear stiffness on spacecraft platform. The bolted-bonded structure will affect the natural frequency, modal mode shape, damping and so on of the whole structure, so as to show the nonlinear mechanical properties of the whole structure. Therefore, it is of great practical significance to study the bolt and fixed bonding surface in depth. According to the previous research on the slip energy dissipation phenomenon of the joint interface, in the theoretical aspect, the energy dissipation formula of the simplified model of the shear bolt connector is derived, and the results show that under the condition of this research, the energy dissipation formula of the shear bolt joint is obtained. The analytical expression of force-relative displacement of the model is given, and the corresponding hysteresis loop graph is drawn by Matlab software. Finally, the power relation between energy dissipation and excitation force, energy dissipation and relative displacement is obtained by substituting different pressure models. In order to obtain the modal parameters of the machined specimen, that is, to obtain the natural frequency of the structure, the modal shape and damping ratio I have carried on the experimental modal analysis to the well-machined experimental specimen. In view of the previous theoretical analysis, I also made an experimental study on the corresponding groups of solid specimens of bolted and bonded structures. During the experiment, the exciter is used to provide the external excitation force. The corresponding signals are collected, analyzed and processed by force sensor, acceleration sensor and LMS data acquisition system. In the whole process, different torque, frequency and excitation force are changed to test the experimental samples. Finally, the data of acceleration value and force value under different experimental conditions are obtained. Then the acceleration data are processed twice with Origin software, and the displacement data is obtained. Finally, the data are summarized, and the corresponding image of the relation between the energy dissipation and the excitation force and the relative displacement of the bolt-to-glue connection structure can be obtained. And compared with the theoretical formula mentioned above, the final conclusion is drawn.
【學位授予單位】：北京理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：V414
本文編號：2455814
[Abstract]:Due to the impact of small meteorite in outer space, complex environmental background factors such as solar radiation pressure, attitude maneuver, satellite orbit change, load start-up and stop, and so on, it often leads to the corresponding dynamic response of in-orbit satellites. The frequency of the structure is as high as 1000 Hz and the amplitude is less than 10 渭 g. This process is called micro-vibration interference. As the two most common connecting modes of spacecraft platform, bolted connection and glued joint play a very important role in the transmission of micro-vibration. In the early study of dynamics, the interface is often regarded as rigid contact, that is, there is no relative motion, but with the deepening of the study, people find that, The bolt and resin glue at the joint are the main sources of passive damping and nonlinear stiffness on spacecraft platform. The bolted-bonded structure will affect the natural frequency, modal mode shape, damping and so on of the whole structure, so as to show the nonlinear mechanical properties of the whole structure. Therefore, it is of great practical significance to study the bolt and fixed bonding surface in depth. According to the previous research on the slip energy dissipation phenomenon of the joint interface, in the theoretical aspect, the energy dissipation formula of the simplified model of the shear bolt connector is derived, and the results show that under the condition of this research, the energy dissipation formula of the shear bolt joint is obtained. The analytical expression of force-relative displacement of the model is given, and the corresponding hysteresis loop graph is drawn by Matlab software. Finally, the power relation between energy dissipation and excitation force, energy dissipation and relative displacement is obtained by substituting different pressure models. In order to obtain the modal parameters of the machined specimen, that is, to obtain the natural frequency of the structure, the modal shape and damping ratio I have carried on the experimental modal analysis to the well-machined experimental specimen. In view of the previous theoretical analysis, I also made an experimental study on the corresponding groups of solid specimens of bolted and bonded structures. During the experiment, the exciter is used to provide the external excitation force. The corresponding signals are collected, analyzed and processed by force sensor, acceleration sensor and LMS data acquisition system. In the whole process, different torque, frequency and excitation force are changed to test the experimental samples. Finally, the data of acceleration value and force value under different experimental conditions are obtained. Then the acceleration data are processed twice with Origin software, and the displacement data is obtained. Finally, the data are summarized, and the corresponding image of the relation between the energy dissipation and the excitation force and the relative displacement of the bolt-to-glue connection structure can be obtained. And compared with the theoretical formula mentioned above, the final conclusion is drawn.
【學位授予單位】：北京理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：V414
【參考文獻】
相關期刊論文 前1條
1 趙偉;;航天器微振動環(huán)境分析與測量技術發(fā)展[J];航天器環(huán)境工程;2006年04期
，本文編號：2455814
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