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RISS 인기검색어
- 검색키워드
- 저자 : Haoxiang He (검색결과 4 건)
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Haoxiang He,Shan Wu,Lican Liao 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.5
If lateral stiffness distribution of continuum structure is unreasonable, its displacement distribution will be non-uniform under lateral load. The non-uniform displacement distribution will weaken the safety of the structure. The continuum structure is equivalent to the cantilever. The optimal lateral stiffness distribution of the structure is obtained by adjusting the section size distribution. The wind load and earthquake action are simplified into three equivalent static loads: uniform load, inverted triangle load and inertia force related load. The shearing displacement and bending displacement distributions along the structural height are derived. The optimization objective is that the second derivative of the total displacement distribution is zero, that is, the displacement distribution is uniform. The section size of the cantilever is optimized and the optimal scheme is obtained. The optimization results are verified by numerical analysis and finite element analysis. The results show that the uniform displacement criterion can be realized by the cantilever with section size distribution of power function. The optimal parameters of the section under different loads are different. A practical design example is presented to prove the applicability.
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Theoretical and experimental study on damage detection for beam string structure
He, Haoxiang,Yan, Weiming,Zhang, Ailin Techno-Press 2013 Smart Structures and Systems, An International Jou Vol.12 No.3
Beam string structure (BSS) is introduced as a new type of hybrid prestressed string structures. The composition and mechanics features of BSS are discussed. The main principles of wavelet packet transform (WPT), principal component analysis (PCA) and support vector machine (SVM) have been reviewed. WPT is applied to the structural response signals, and feature vectors are obtained by feature extraction and PCA. The feature vectors are used for training and classification as the inputs of the support vector machine. The method is used to a single one-way arched beam string structure for damage detection. The cable prestress loss and web members damage experiment for a beam string structure is carried through. Different prestressing forces are applied on the cable to simulate cable prestress loss, the prestressing forces are calculated by the frequencies which are solved by Fourier transform or wavelet transform under impulse excitation. Test results verify this method is accurate and convenient. The damage cases of web members on the beam are tested to validate the efficiency of the method presented in this study. Wavelet packet decomposition is applied to the structural response signals under ambient vibration, feature vectors are obtained by feature extraction method. The feature vectors are used for training and classification as the inputs of the support vector machine. The structural damage position and degree can be identified and classified, and the test result is highly accurate especially combined with principle component analysis.
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Theoretical and experimental study on damage detection for beam string structure
Haoxiang He,Weiming Yan,Ailin Zhang 국제구조공학회 2013 Smart Structures and Systems, An International Jou Vol.12 No.3
Beam string structure (BSS) is introduced as a new type of hybrid prestressed string structures. The composition and mechanics features of BSS are discussed. The main principles of wavelet packet transform (WPT), principal component analysis (PCA) and support vector machine (SVM) have been reviewed. WPT is applied to the structural response signals, and feature vectors are obtained by feature extraction and PCA. The feature vectors are used for training and classification as the inputs of the support vector machine. The method is used to a single one-way arched beam string structure for damage detection. The cable prestress loss and web members damage experiment for a beam string structure is carried through. Different prestressing forces are applied on the cable to simulate cable prestress loss, the prestressing forces are calculated by the frequencies which are solved by Fourier transform or wavelet transform under impulse excitation. Test results verify this method is accurate and convenient. The damage cases of web members on the beam are tested to validate the efficiency of the method presented in this study. Wavelet packet decomposition is applied to the structural response signals under ambient vibration, feature vectors are obtained by feature extraction method. The feature vectors are used for training and classification as the inputs of the support vector machine. The structural damage position and degree can be identified and classified, and the test result is highly accurate especially combined with principle component analysis.
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Bin Du,Haoxiang Li,Wei Zheng,Xuedong He,Tao Ma,Huaqiang Yin 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.1
Air ingress incidents are major safety accidents in very-high-temperature reactors (VHTRs). Air containing a high volume fraction of oxygen may cause severe oxidation of core components at the VHTR, especially for the significantly thin alloy tube wall in the intermediate heat exchanger (IHE). The research objects of this study are Inconel 617 and Incoloy 800H, two candidate alloys for IHE in VHTR. The air ingress accident scenario is simulated with high-temperature air flow at 950 C. A continuous oxide scale was formed on the surfaces of both the alloys after the experiment. Because the oxide scale of Inconel 617 has a loose structure, whereas that of Incoloy 800H is denser, Inconel 617 exhibited significantly more severe internal oxidation than Incoloy 800H. Further, Inconel 617 showed a significant decrease in ultimate tensile strength and plasticity after aging for 200 h, whereas Incoloy 800H maintained its tensile properties satisfactorily. Through control experiment under vacuum, we preliminarily concluded that serious internal oxidation is the primary reason for the decline in the tensile properties of Inconel 617
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