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RISS 인기검색어
- 검색키워드
- 저자 : Kunpeng Guo (검색결과 4 건)
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Kunpeng Shi,Jinyun Guo,Xin Liu,Lu Liu,Xinzhao You,Fangjian Wang 한국지질과학협의회 2020 Geosciences Journal Vol.24 No.4
To explore the ionospheric coupling mechanism, the total electron contents (TECs) and slant TECs (STECs) were processed from GPS sites in China, Nepal and India, and the singular spectrum analysis (SSA) method was introduced to investigate the seismic-ionospheric signals prior to the Mw7.8 Nepal earthquake on April 25, 2015. The results of pre-earthquake ionospheric anomaly show that there were obviously positive on 2nd day and negative anomalies on 14th day prior to the earthquake, respectively. The radius of anomalous area with a regular elliptical shape reached 2500 km and 2000 km in the above days respectively, which was close to the radius of Nepal earthquake. After excluding the moving effects of ionosphere hump, the investigation by the global ionosphere maps (GIMs) shows that a wide TEC abnormality appeared over the epicenter and conjugated region with the duration of 12 hr. Besides, the magnitude of TEC anomalies impending the shock, with its peaks happening at the midday (local time), was proportional to the number of days prior to the occurrence. By using the STECs within seismogenic zone, we further studied the coseismic ionospheric disturbance (CID) of Nepal earthquake. The results show that two modes of CID propagation velocity have been detected. Due to the TEC respond of Rayleigh wave, one mode had average propagating speed of 1.3 km/s in the near-field within 800 km, and gradually reaching up to 2.7 km/s in the far-field beyond 2000 km. Another mode had average propagating speed of 0.6 km/s only existing in the near-field, which was in accordance with the speed of shock acoustic waves. Besides, CID intensity presented the obvious directional difference. The ambient magnetic field around the epicenter made it easier for CID to spread in the southward direction, the plateau topography also prohibited the propagation of ionospheric disturbance, and most CID points were detected along the southeast direction of the epicenter which is consistent with the rupture propagation.
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Dynamic analysis of train-bridge interaction system with flexible car-body
Wang Kunpeng,Xia He,Xu Man,Guo Weiwei 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.9
Lighter vehicles are used in high-speed trains and urban rail transit trains, which leads to lesser stiffness of car-bodies, so car-bodyflexibility should be considered in dynamic analysis of the train-bridge system. In this paper, the vehicle model is established based onflexible multi-body dynamics, in which the car-body is simulated with an Euler beam, and the movement of the car-body is the superpositionof its rigid displacement and the generalized displacement of vibration mode of the Euler beam with free boundaries. The dynamicanalysis model of train-bridge model is established using the flexible car-body model. A case study is performed of an ICE3 train runningon a (48+80+48) m three-span continuous girder bridge. The calculated results show that the car-body flexibility has little influence onbridge responses and vehicle running safety indices, but great influence on car-body accelerations. It is necessary to consider the car-bodyflexibility, especially in studying the influence of additional bridge deformations on vehicle responses.
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Application of Digital Twin to Monitor and Optimize Utility Process
Ho Dong Lee,Kunpeng Guo,Lorena F.S. Souza,Jong Min Lee 제어로봇시스템학회 2021 제어로봇시스템학회 국제학술대회 논문집 Vol.2021 No.10
Digital transformation utilizing the digital twin of a process can provide enormous benefit. It is possible to effectively monitor the process operation and control the process erroneous behavior by using the high-fidelity digital twin. In addition, the better operational strategy can be identified through process optimization from the digital twin. To perform such activities about the huge scale of process, we established a digital platform that allows the operational personnel to efficiently monitor the operation condition with the useful information such as economics and representative indexes that can be obtained from the digital twin. A chemical plant utility system that has a goal to supply the process utilities such as steam and power stably was used as the target process. As exclusive features of the project for the utility system the platform suggests the multi-level optimization results in terms of the process specifications as well as the trends of the key performance indicators of the process. It also provides a tool, what-if analysis, to simulate the hypothetical situation in preparation for the possible change of the external factors. Using the digital process twin technology, we were able to suggest the capability to save the cost and present the high-level information that cannot be utilized from the process data alone.
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Hongtao Shen,Weicheng Hu,Qing-shan Yang,Fucheng Yang,Kunpeng Guo,Tong Zhou,Guowei Qian,Qinggen Xu,Ziting Yuan 한국풍공학회 2022 Wind and Structures, An International Journal (WAS Vol.35 No.6
In wind-resistant designs, wind velocity is assumed to be a Gaussian process; however, local complex topography may result in strong non-Gaussian wind features. This study investigates the non-Gaussian wind features over complex terrain under atmospheric turbulent boundary layers by the large eddy simulation (LES) model, and the turbulent inlet of LES is generated by the consistent discretizing random flow generation (CDRFG) method. The performance of LES is validated by two different complex terrains in Changsha and Mianyang, China, and the results are compared with wind tunnel tests and onsite measurements, respectively. Furthermore, the non-Gaussian parameters, such as skewness, kurtosis, probability curves, and gust factors, are analyzed in-depth. The results show that the LES method is in good agreement with both mean and turbulent wind fields from wind tunnel tests and onsite measurements. Wind fields in complex terrain mostly exhibit a left-skewed Gaussian process, and it changes from a softening Gaussian process to a hardening Gaussian process as the height increases. A reduction in the gust factors of about 2.0%-15.0% can be found by taking into account the non-Gaussian features, except for a 4.4% increase near the ground in steep terrain. This study can provide a reference for the assessment of extreme wind loads on structures in complex terrain.
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