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Changbao Yang, Zhisheng Wang, Yuanwei Lyu, Jingyang Zhang and Ben Xu
With increasing demand for load capacity and dynamic responses, the new generation of Gas Dynamic Foil Bearings (GDFB), assembled from preloaded elastic multi-leaf foils, has been put forward. It exhibits steady and dynamic characteristics that are more ...
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Yonggui Zheng, Meng Liu, Hao Wu, Jun Wang, Peng Xu and Side Jin
As a critical system of onboard aircraft equipment, the environmental control system (ECS) has an essential impact on flight safety. The performance of the ECS is usually tested using the thermal test facility. The facility comprises temperature and pres...
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Rongbin Xin, Jinguo Zhai, Chang Liao, Zongyu Wang, Jifeng Zhang, Zabihollah Bazari and Yulong Ji
Development of intelligent ships requires marine diesel engine simulation models of high accuracy and fast response. In addition, with advent of tighter shipping air emissions regulations, such models are required to have emission prediction capabilities...
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Doubly-fed induction generators (DFIGs) are widely used in wind energy conversion systems. The dynamic features of DFIGs make it important to focus on designing high-performance control schemes. However, the dynamic characteristics of such generators dep...
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Xiancheng Gu, Linghua Dong, Tong Li and Weidong Yang
An active rotor with trailing-edge flaps (TEFs) is an effective active vibration control method for helicopters. Blade flapping dynamic characteristics have a significant effect on the active vibration control performance of an active rotor. In this stud...
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Tuo Jia, Tucun Shao, Qian Liu, Pengcheng Yang, Zhinuo Li and Heng Zhang
As countries attach great importance to the ocean-going navigation capability of ships, the energy consumption of shipborne equipment has attracted much attention. Although energy consumption analysis is a guiding method to improve energy efficiency, it ...
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Amjad Humaidi and Mustafa Hameed
In this work, a new adaptive block-backstepping control design algorithm was developed for an under-actuated model (represented by a ball?arc system) to enhance the transient and steady-state behaviors and to improve the robustness characteristics of the...
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Yin Zhang, Jian Shen, Liwei He, Jimeng Feng, Lina Chi and Xinze Wang
Human activities, global warming, frequent extreme weather events, and changes in atmospheric composition affect the solar radiation reaching the Earth?s surface, affect mass and heat transfer at the air?water interface, and induce oscillations in wind-d...
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Fuming Xia, Bo Jing and Wenfeng Xu
This work investigates the short-term dynamics caused by shape changes of morphing aircraft. We select a symmetric variable sweep morphing aircraft as the object of study and establish a six-degree-of-freedom multi-loop cascade model, and the coupling be...
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Marwan Rosyadi, Atsushi Umemura, Rion Takahashi and Junji Tamura
In this paper, a detailed model and an average model of an MMC (Modular Multilevel Converter)-controlled Permanent Magnet Synchronous Generator (PMSG)-based direct drive wind turbine are proposed. The models are used to analyze the steady-state and trans...
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Igor V. Kaliberda,Alexander Chernyshev
Pág. 52 - 56
The problem of practical implementation of the theory of control systems is that real objects are most often not linear and their models cannot be adequately represented in the form of systems of linear equations. For nonlinear systems, in turn, there ar...
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Zhipeng Zhu and Houlin Liu
Ship ballast pumps have stringent requirements for their transient characteristics. Here, the pneumatic control valve and programmable logic controller (PLC) are applied to realize the rapid reduction in flow rate for ballast pumps, and the dynamic press...
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Zeynep Bala Duranay, Hanifi Guldemir, Servet Tuncer
Pág. 35 - 48
DSP implementation of speed control of three phase induction motor drive is presented in this paper. A closed loop speed control has been achieved using constant V/f technique which is a simple scalar control method used to control the magnitude of the c...
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Dongxu Liu, Changchuan Xie, Guanxin Hong and Chao An
In this paper, multibody dynamic modeling and a simulation method for the wingtip-jointing process of a new-concept composite aircraft system are investigated. When the wingtips of two aircraft are jointed, the resultant wingtip-jointed aircraft is regar...
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Song-Hun Chong
This paper proposes a theoretical framework for the characterization of the strain-dependent dynamic properties of soils. The analysis begins with an analytical constitutive model for soils under steady-state cyclic loading. The model describes the domin...
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Liangliang Li, Di Zhang and Yonghui Xie
In this study, the sensitivity of MEMS gas bearing? performance to the wear in different axial and circumferential positions is investigated in detail. Rarefaction effect is introduced into the transient and steady lubrication equation, and then the fini...
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Jianfeng Zhu, Guochen Huang, Maoguang Xu, Ming Liu, Bo Diao and Po Li
Combined with the development trend of high speed generators and the high voltage of DC microgrids in high-power series hybrid aero propulsion system, a set of hybrid systems with a power of 200 kW, voltage of 540 V, and speed of 21,000 r/min is establis...
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Qian Yang, Suoping Li, Hongli Li and Weiru Chen
To accurately estimate the service delay behavior of IEEE 802.11 networks, this paper comprehensively considers four main factors that affect the performance of IEEE 802.11 networks and establishes a service delay model with statistical characteristics. ...
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Mingke Liao, Deshan Cui, Xun Bao, Zhuo Qiao and Chenxi Zhao
The reservoir water level in the Three Gorges Reservoir (TGR) of the Yangtze River is adjusted between 145 m and 175 m throughout the year. The landslide below the reservoir water level bears periodic dynamic seepage pressure on the basis of the original...
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Junfeng Sun, Meihong Liu, Zhen Xu, Taohong Liao, Xiangping Hu, Yuxian Li and Juan Wang
A new type of cylindrical gas film seal (CGFS) with a flexible support is proposed according to the working characteristics of the fluid dynamic seal in high-rotational-speed fluid machinery, such as aero-engines and centrifuges. Compared with the CGFS w...
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