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RISS 인기검색어
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- 저자 : Jianyue Zhu (검색결과 6 건)
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Yun Zhu,Chengwenyuan Huang,Yang Wang,Jianyu Wang 한국자동차공학회 2022 International journal of automotive technology Vol.23 No.4
Accurate short-term traffic state prediction is a crucial requisite for control and guidance of traffic flow in the intelligent traffic system, which has attracted increasing attention in the transportation field recently. This paper tests the optimization performances of two emerging bionic algorithms, known as Cuckoo Search Algorithm (CS) and Bat Algorithm (BA). Combined with the Support Vector Regression (SVR) principle, the two aforementioned algorithms are applied to optimize the kernel function parameters in SVR. At last, the speed data of a road network in Guangzhou are collected. The prediction performances of the CS-SVR and BA-SVR models are tested after preprocessing the data. From the overall prediction rates, the CS-SVR algorithm is slightly better than BA-SVR in terms of calculating speed. Furthermore, the two algorithms are significantly superior to the traditional SVR model and long short-term memory networks (LSTM), thereby verifying their effectiveness and practicability in short-term traffic state prediction.
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Integrated Modeling for the Design of Deformable Mirrors Using a Parametric Module Method
Junqing Zhu,Wei Sha,Changzheng Chen,Xingxiang Zhang,Jianyue Ren 한국광학회 2015 Current Optics and Photonics Vol.19 No.5
Active optics is a key technology for future large-aperture space telescopes. In the design of deformablemirrors for space applications, the design parameter trade-off between the number of regularly configuredactuators and the correction capability is essential but rarely analyzed, due to the lack of design legacy. This paper presents a parametric module method for integrated modeling of deformable mirrors withregularly configured actuators. A full design parameter space is explored to evaluate the correctioncapability and the mass of deformable mirrors, using an autoconstructed finite-element parametric modelingmethod that utilizes manual finite-element meshing for complex structures. These results are used to providedesign guidelines for deformable mirrors. The integrated modeling method presented here can be used forfuture applied optics projects
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Zhiqiang Wang,Jianyue Zhu 대한토목학회 2024 KSCE Journal of Civil Engineering Vol.28 No.4
To investigate wheel-rail contact stick-slip characteristics (SSCs) under coupling damages of rail corrugation and wheel flat and explain the co-action mechanism of the two damages, a vehicle-track system model was built, and the SSCs were analyzed by employing the index of the overall dispersion rate of adhesion coefficient (ODRAC). The results show that both inner and outer wheel-rail systems (WRSs) on the curve have a propensity for stick-slip motion. Since the values of SSCs of the inner WRS are 1.204 to 2.963 times higher than those of the outer one, the inner WRS is easier to stick-slip vibration (SSV). When the rail corrugation is fixed, the overall dispersion rates of adhesion coefficients (ODRACs) progressively decrease with the increase of flat depth and length, and the decrease range is 2.766 − 41.775%. When the wheel flat is fixed, the ODRACs also progressively decrease as the corrugation wavelength increases, and the decrease ranges from 7.129% to 42.474%; the ODRACs incrementally increase together with the increase of the corrugation wave depth, and the increase ranges from 10.030% to 30.380%. The presence of flat will attenuate the level of SSV of the original system with rail corrugation, whilst the presence of corrugation will intensify the level of SSV of the original system with wheel flat.
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Zhe Chen,Junqing Zhu,Jiantao Peng,Xingxiang Zhang,Jianyue Ren 한국광학회 2016 Current Optics and Photonics Vol.20 No.1
A novel optical design for high resolution, large field of view (FOV) and multispectral remote sensingis presented. An f/7.3 Korsch and two f/17.9 Cook three-mirror optical systems are integrated by sharingthe primary and secondary mirrors, bias of the FOV, decentering of the apertures and reasonable structurearrangement. The aperture stop of the Korsch system is located on the primary mirror, while those ofthe Cook systems are on the exit pupils. High resolution image with spectral coverage from visible tonear-infrared (NIR) can be acquired through the Korsch system with a focal length of 14 m, whilewide-field imaging is accomplished by the two Cook systems whose focal lengths are both 13.24 m. The full FOV is 4°×0.13°, a coverage width of 34.9 km at the altitude of 500 km can then be acquiredby push-broom imaging. To facilitate controlling the stray light, the intermediate images and the real exitpupils are spatially available. After optimization, a near diffraction-limited performance and a compactoptical package are achieved. The sharing of the on-axis primary and secondary mirrors reduces the costof fabrication, test, and manufacture effectively. Besides, the two tertiary mirrors of the Cook systemspossess the same parameters, further cutting down the cost.
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Suppression of abnormal chattering of a high-speed EMU carbody
Dao Gong,Zegen Wang,Jinsong Zhou,Jianyue Zhu 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.4
A carbody chattering phenomenon accompanied by bogie hunting movement was investigated. The online test results showed that the vehicle at a large tread conicity state exhibited insufficient stability when running at higher speeds, causing the hunting frequency of the bogie to continuously increase, approach the diamond-shaped deformation modal frequency of the carbody, consequently causing the carbody to chatter. To improve the running stability of the vehicle, to suppress the carbody chattering, a two-step progressive optimisation method that combined analytical optimisation, simulation optimisation to optimise the parameters of the anti-yaw damper was proposed. Furthermore, the effect of optimisation was experimentally verified. Results showed that after optimisation, the critical speed of the vehicle under the condition of worn wheel was significantly enlarged, the bogie exhibited no obvious hunting motion, carbody chatter was significantly alleviated, both the ride quality, the curve passing performance were improved.
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