【摘要】：螺栓松動(dòng)將導(dǎo)致結(jié)構(gòu)完整性的破壞,螺栓連接狀態(tài)的實(shí)時(shí)有效監(jiān)測(cè)和評(píng)估具有重大意義。提出了一種基于亞諧波共振分析的螺栓松動(dòng)識(shí)別方法。針對(duì)螺栓連接結(jié)構(gòu)簡(jiǎn)化的單自由度非線性模型,采用多尺度方法分析了亞諧波共振現(xiàn)象,定性模擬了螺栓松動(dòng)損傷亞諧波激勵(lì)條件。以鋁梁螺栓搭接結(jié)構(gòu)為實(shí)驗(yàn)對(duì)象,利用粘貼在鋁梁表面的壓電作動(dòng)/傳感單元,采用不同頻率的激勵(lì)信號(hào)作用在作動(dòng)片上,傳感片接收響應(yīng)信號(hào),對(duì)其進(jìn)行頻譜分析,通過提取響應(yīng)頻譜中的亞諧波成分進(jìn)行螺栓松動(dòng)損傷識(shí)別。仿真與實(shí)驗(yàn)結(jié)果表明,亞諧波產(chǎn)生所需激勵(lì)頻率在兩倍固有頻率附近,使用亞諧波檢測(cè)方法能有效識(shí)別螺栓松動(dòng)。
[Abstract]:The loosening of bolt will lead to the damage of structural integrity, and it is of great significance to monitor and evaluate the state of bolt connection in real time and effectively. A bolt loosening identification method based on subharmonic resonance analysis is proposed. In view of the simplified single-degree-of-freedom nonlinear model of bolted connections, the subharmonic resonance phenomenon is analyzed by using multi-scale method, and the subharmonic excitation conditions of loosening damage of bolts are qualitatively simulated. Taking the bolt lap structure of aluminum beam as the experimental object, the piezoelectric actuating / sensing unit pasted on the surface of aluminum beam was used. The excitation signals of different frequencies were used to act on the actuators, and the sensing plates received the response signals and analyzed the frequency spectrum of the sensors. The sub-harmonic component of the response spectrum is extracted to identify the bolt loosening damage. The simulation and experimental results show that the excitation frequency required for sub-harmonic generation is near twice the natural frequency, and the bolt looseness can be effectively identified by using the sub-harmonic detection method.
【作者單位】： 武漢大學(xué)工程力學(xué)系;
【基金】：國家自然科學(xué)基金資助項(xiàng)目(51378402)
【分類號(hào)】：TH131.3
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本文編號(hào)：2439641