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  • SAGE Publications  (3)
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  • SAGE Publications  (3)
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  • 1
    Online Resource
    Online Resource
    SAGE Publications ; 2019
    In:  Advances in Mechanical Engineering Vol. 11, No. 1 ( 2019-01), p. 168781401882236-
    In: Advances in Mechanical Engineering, SAGE Publications, Vol. 11, No. 1 ( 2019-01), p. 168781401882236-
    Abstract: A new hybrid conjugate gradient method is proposed in this article based on the gradient operator and applied to the structural dynamic load identification problem. It has proved that the present method with the strong Wolfe line search possesses sufficient descent property. In addition, the present method is globally convergent when the parameter in the strong Wolfe line search conditions is restricted in some suitable intervals. Three example problems from engineering are solved by the newly developed conjugate gradient method to demonstrate the robustness and effectiveness of conjugate gradient method in solving multi-source dynamic load identification problems. Compared with the traditional Landweber iteration regularization method (Landweber), the proposed conjugate gradient method can more stably and effectively overcome the influences of noise, largely reduce the number of iterations, and provide accurate results in identifying multi-source dynamic force in practical engineering structure.
    Type of Medium: Online Resource
    ISSN: 1687-8140 , 1687-8140
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2019
    detail.hit.zdb_id: 2501620-9
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  • 2
    Online Resource
    Online Resource
    SAGE Publications ; 2020
    In:  Science Progress Vol. 103, No. 3 ( 2020-07), p. 003685042093128-
    In: Science Progress, SAGE Publications, Vol. 103, No. 3 ( 2020-07), p. 003685042093128-
    Abstract: Dynamic forces are very important boundary conditions in practical engineering applications, such as structural strength analysis, health monitoring and fault diagnosis, and vibration isolation. Moreover, there are many applications in which we have found it very difficult to directly obtain the expected dynamic load which acts on a structure. Some traditional indirect inverse analysis techniques are developed for load identification by measured responses. These inverse problems about load identification mentioned above are complex and inherently ill-posed, while regularization methods can deal with this kind of problem. However, most of regularization methods are only limited to solve the pure mathematical numerical examples without application to practical engineering problems, and they should be improved to exclude jamming of noises in engineering. In order to solve these problems, a new regularization method is presented in this article to investigate the minimum of this minimization problem, and applied to reconstructing multi-source dynamic loads on the frame structure of hydrogenerator by its steady-state responses. Numerical simulations of the inverse analysis show that the proposed method is more effective and accurate than the famous Tikhonov regularization method. The proposed regularization method in this article is powerful in solving the dyanmic load identification problems.
    Type of Medium: Online Resource
    ISSN: 0036-8504 , 2047-7163
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2020
    detail.hit.zdb_id: 2483680-1
    detail.hit.zdb_id: 2199376-2
    SSG: 11
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  • 3
    Online Resource
    Online Resource
    SAGE Publications ; 2022
    In:  Environment and Planning E: Nature and Space Vol. 5, No. 1 ( 2022-03), p. 225-249
    In: Environment and Planning E: Nature and Space, SAGE Publications, Vol. 5, No. 1 ( 2022-03), p. 225-249
    Abstract: This paper critically examines current ecological development planning and practice in China through an environmental microhistory approach. By tracing the gradual disappearance of an indigenous plant – the common reed ( Phragmites australis) – on Chongming Island in Shanghai, which is known for the grand Eco-Islands development plan, this paper reveals the paradox of ecological destruction through eco-development in China. Based on data collected from archives, through oral history and through on-site fieldwork, we have reconstructed and analysed the transformation of Chongming Island’s reed ecology over time. Our research documents the historical importance of reeds to Chongming culture and identity. The transformation of the reed landscape mirrors, we argue, broader environmental and social transformations on the island. The near extinction of the once abundant reed in the coastal wetlands due to massive land reclamation projects for the purpose of industrialisation and urbanisation is a reflection of the prevailing pursuit for economic growth. Land reclamation projects in the early 2000s were facilitated by the planting of an invasive grass that replaced reeds and other native wetland plants. Ironically, the invasive grass served to legitimise continuous land reclamation as part of Chongming’s eco-development. Moreover, reeds that grew by the rivers and constituted a central part of local livelihoods were gradually wiped out as a result of a series of river regulation projects under the eco-development. Our research reveals that the current ecological agenda has privileged modern engineering solutions and aesthetics while largely ignoring local traditional knowledge. The case of Chongming delivers a sobering message that well-intentioned ecological initiatives can in fact have disastrous effects if the local environment, its ecological features, cultural characteristics, and historical and social contexts are not fully considered. Overall, this paper pioneers an environmental microhistory approach in evaluating contemporary urban ecological initiatives and contributes methodological and empirical insights to advance Chinese eco-developments.
    Type of Medium: Online Resource
    ISSN: 2514-8486 , 2514-8494
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2022
    detail.hit.zdb_id: 2904846-1
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