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Xin Wei,Zhaohui Yao,Feng Jin,Zhixiong Wang,Honghu Ji 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.6
In order to investigate the leakage and heat transfer of eccentric labyrinth seals, the flow and heat transfer process of eccentric and rotating straight-through labyrinth seals were numerically simulated. The research results show that the influence of eccentricity and rotation on the leakage coefficient is very small, and the change range is less than 2 %. Under the condition of non-eccentricity, the influence of rotating speed on the leakage coefficient depends on the rotating Taylor number. When the Taylor number is greater than 34.2, the leakage coefficient decreases slightly with the increase of rotating speed. At the same pressure ratio and rotating speed, the average Nusselt number of stator is greater than that of rotor. With the increase of eccentricty, the average Nusselt number of the section with larger clearance increases gradually, while the average Nusselt number of the section with smaller clearance decreases gradually.
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代云红(Yunhong Dai),尧朝晖(Zhaohui Yao) YIXIN 출판사 2023 Journal of China Studies Vol.1 No.5
如今数字化被视为能提高企业核心竞争力的热点话题,而企业中存在的代理问题能否随数字技术的应用而得以缓解却仍是黑箱。本文以2010-2022 年在沪深A 股上市的公司为样本,采用实证研究的方法,探究数字化转型对企业代理成本的影响及其作用机制。研究结果表明:数字化转型会增加企业的代理成本。机制分析发现,数字化转型通过增加高管薪酬粘性和在职消费进而增加了企业代理成本,但通过企业内部的海外人才招聘以及外部的金融机构持股可以缓解由企业数字化转型带来的代理问题。进一步分析发现,数字化转型虽然加剧了企业代理问题,在非国有、成熟期、非高新技术、东部地区企业进行数字化转型时,影响更加明显,但成本增加的同时数字化转型也提高了企业的投入产出率以及缓解了企业的融资约束。综上,研究结果从公司治理的角度论证了企业数字化带来的影响,为减少企业代理问题提供了新的解决依据和思路,丰富和拓展了技术革新对经济社会的影响研究。 Nowadays, digitization is regarded as a hot topic that can improve the core competitiveness of enterprises, and whether the agency problems existing in enterprises can be alleviated with the application of digital technology is still a black box. This article takes companies listed on the Shanghai and Shenzhen A-shares from 2010 to 2022 as samples and uses empirical research methods to explore the impact and mechanism of digital transformation on corporate agency costs. The research results indicate that digital transformation will increase the agency costs of enterprises. Mechanism analysis found that digital transformation increases agency costs by increasing executive compensation stickiness and on-the-job consumption, but through internal overseas talent recruitment and external financial institution shareholding, agency problems caused by digital transformation can be alleviated. Further analysis reveals that although digital transformation exacerbates the agency problem of enterprises and has a more significant impact on non-state-owned, mature, non-high-tech, and eastern region enterprises when conducting digital transformation, while increasing costs, digital transformation also improves the input-output rate of enterprises and alleviates financing constraints. In summary, the research results demonstrate the impact of enterprise digitization from the perspective of corporate governance, providing new solutions and ideas for reducing agency issues in enterprises, and enriching and expanding research on the impact of technological innovation on the economy and society.
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Ying Huang,Yan Wu,Changhong Chen,Zhaohui Huang,Yao Yao 국제구조공학회 2019 Steel and Composite Structures, An International J Vol.31 No.6
As an extremely destructive accident, progressive collapse is defined as the spread of an initial local failure from element to element, resulting eventually in the collapse of an entire structure or disproportionately large of it. To prevent the occurrence of it and evaluate the ability of structure resisting progressive collapse, the nonlinear static procedure is usually adopted in the whole structure design process, which considered dynamic effect by utilizing Dynamic Increase Factor (DIF). In current researches, the determining of DIF is performed in full-rigid frame, however, the performance of beam-column connection in the majority of existing frame structures is not full-rigid. In this study, based on the component method proposed by EC3 guideline, the expression of extended endplate connection performance is further derived, and the connection performance is taken into consideration when evaluated the performance of structure resisting progressive collapse by applying the revised plastic P-M hinge. The DIF for structures with extended endplate beam-column connection have been determined and compared with the DIF permitted in current GSA guideline, the necessity of considering connection stiffness in determining the DIF have been proved.
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Component-based model for posttensioned steel connections against progressive collapse
Yan Fei Zhu,Chang Hong Chen,Ying Huang,Zhaohui Huang,Yao Yao,Leon M. Keer 국제구조공학회 2021 Steel and Composite Structures, An International J Vol.40 No.4
A component-based method for the estimation of the posttensioned (PT) steel frame against progressive collapse is proposed and presented in the current paper. A mechanical model of PT steel connections is developed and benchmarked with experimental data of a PT beam-column substructure from literature. The developd mechanical models of four PT connections are able to capture the initial elastic stiffness, decompression load, and residual stiffness under lateral loading. Then, analysis of a reduced-scale three-storey two-bay PT steel frame is carried out with sufficient accuracy by incorporating the proposed joint model into the frame analysis. The proposed method is then applied to assessing progressive collapse of a one-storey two-bay PT frame under middle column removal scenario, and is verified against existing experimental and ANSYS finite element results. Three resistance mechanism for progressive collapse of the PT frame are evaluated, which consists of angle flexural mechanism, beam compression arching action and strand tensile catenary action. Finally, parameter analyses of the PT frames are conducted to investigate the effects of the connection details on the behavior and resistance of progressive collapse. The proposed model can be used to predict the quasi-static behavior of PT frames under monotonic vertical loading conditions with satisfactory accuracy.
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