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Dai Y.-L.,Wuhan Naval University of Engineering | Wang C.-H.,Army | Miao H.,Wuhan Naval University of Engineering | Liu Z.-Y.,Wuhan University of Technology
Chuan Bo Li Xue/Journal of Ship Mechanics | Year: 2011

The motion stability theory of a nonlinear system and the principles of continuation based on homotopy techniques were applied to stable state response and motion stability analysis of submarines during emergency ascent. The stability analysis results were verified by simulations using direct numerical integrations of the fully nonlinear, coupled six degrees-of-freedom equations of motion for the submarine. It indicates that homotopy and continuation theory techniques could be an effective analysis method for motion stability of submarines under water.


Dai Y.,Wuhan Naval University of Engineering | Wang C.,Army | Miao H.,Wuhan Naval University of Engineering | Liu Z.,Wuhan University of Technology
Wuhan Ligong Daxue Xuebao (Jiaotong Kexue Yu Gongcheng Ban)/Journal of Wuhan University of Technology (Transportation Science and Engineering) | Year: 2010

In order to eliminate the effects of strong coupling between all dimensions of movements, severe nonlinearities and time-varying characteristics, a sliding mode fuzzy controller for a submarine during emergency ascent was developed in this paper. A novel multivariate sliding mode fuzzy grey predictive controller was also proposed in order to compensate the delay of the actuators such as rudder, drainage and the pneumatic blowing system. The simulation results show that the control approach not only remains robustness of sliding mode control, but also avoids the effects of chattering phenomenon, and possess better performance of the system. The stability and robustness of the system are good.


Evans T.,Royal Center for Defence Medicine | Holdsworth D.A.,University of Oxford | Jackson S.,Army | Nicol E.,Royal Brompton Hospital | Nicol E.,Royal Center for Defence Medicine
Journal of the Royal Army Medical Corps | Year: 2015

‘Palpitations’ include a broad range of symptoms relating to the perception of abnormal activity of the heart. They may reflect an underlying arrhythmia or a hyperawareness of normal cardiac activity caused by stress or anxiety. The challenge to a clinician assessing patients with palpitations is to assess the likely cause of symptoms, to stratify the individual patient risk and to choose the correct management strategy delivered with appropriate urgency. The young military population, subject to increased exposure to environmental stress, is at an increased risk of palpitations. Due to the distracting nature of this symptom and the frequently sudden and unheralded onset, a common consequence is medical downgrading. This article will provide a guide to assessing the heterogeneous group presenting with palpitations and how to both establish the cause and identify the correct treatment for each patient in a timely manner. © 2015, Royal Army Medical College. All Rights Recevied.


PubMed | Oxford Genetics, Royal Brompton Hospital and Army
Type: Journal Article | Journal: Journal of the Royal Army Medical Corps | Year: 2015

Palpitations include a broad range of symptoms relating to the perception of abnormal activity of the heart. They may reflect an underlying arrhythmia or a hyperawareness of normal cardiac activity caused by stress or anxiety. The challenge to a clinician assessing patients with palpitations is to assess the likely cause of symptoms, to stratify the individual patient risk and to choose the correct management strategy delivered with appropriate urgency. The young military population, subject to increased exposure to environmental stress, is at an increased risk of palpitations. Due to the distracting nature of this symptom and the frequently sudden and unheralded onset, a common consequence is medical downgrading. This article will provide a guide to assessing the heterogeneous group presenting with palpitations and how to both establish the cause and identify the correct treatment for each patient in a timely manner.


Dai Y.,Wuhan Naval University of Engineering | Kong Q.,Wuhan Naval University of Engineering | Huang W.,Wuhan Naval University of Engineering | Wang C.,Army | Zhu Y.,Hunan University of Technology
Chinese Control Conference, CCC | Year: 2013

In this paper the HLA (High Level Architecture) simulation techniques were used to design the simulation system of marine power plants. A kind of hierarchical system structure was proposed so as to separate the application layer from RTI (Runtime Infrastructure). Hence the developed simulation application is plug and play. The reusability and interoperability of simulation application is fulfilled. There is a study of key technologies such as composition and development process of federation based on FEDEP (Federation Development and Execution Process) model. A prototype of the simulation system of marine power plants was presented. The simulation results show that the presented procedure is valid. © 2013 TCCT, CAA.


Tsay T.I.J.,National Cheng Kung University | Lai Y.F.,Army | Hsiao Y.L.,Army
IEEE/RSJ 2010 International Conference on Intelligent Robots and Systems, IROS 2010 - Conference Proceedings | Year: 2010

The developed mobile manipulator is primarily composed of a mobile base, a robot manipulator and an eye-in-hand vision system. The material handling of a mobile manipulator has two stages: guiding the mobile base between stations, and picking up a workpiece from a station. Fast landmark recognition and obstacle detection based on color segmentation are proposed for path following, obstacle avoidance and mobile base positioning. Using the machine vision, a vision-based vector field histogram method is modified and applied to guide the mobile manipulator for obstacle avoidance. However, after the mobile manipulator arrives at the station, positioning errors of the mobile base and the non-horizontality of ground inevitably cause position and orientation errors of the mobile base relative to the station. A vision-guided control strategy with a behavior-based look-and-move structure is presented. This strategy is based on six predefined image features. In the designed neural fuzzy controllers, each image feature is taken to generate intuitively one degree of freedom motion command relative to the camera coordinate frame using fuzzy rules, which define a specific visual behavior. These behaviors are then combined and executed in turns to perform grasping tasks. ©2010 IEEE.


Lan X.Y.,Shenyang Aerospace University | Guan Q.Y.,Shenyang Aerospace University | Zou Y.,Army
Applied Mechanics and Materials | Year: 2014

It is known that computational complexity of the propagator method (PM) can be significantly smaller than those of MUSIC and ESPRIT because the PM does not require any eigenvalue decomposition (EVD) of the received data. However, most the algorithm based on PM requires more antenna elements than targets. In order to solve these issues, a novel low energy algorithm utilizing array base-line rotation for multiple targets estimation is proposed. By rotating two elements and setting a fixed time delay, even number of elements is selected to form a virtual UCA. Then, the received data of signals will be sampled at multiple positions, which improves the array elements utilization greatly. Simulations results verified the effectiveness of the proposed algorithm with high resolution and estimation accuracy performance. © (2014) Trans Tech Publications, Switzerland.


Cheng J.-X.,Beijing Qinghe Building Number 8 | Zhu W.-K.,Beijing Qinghe Building Number 8 | Hu Y.-X.,Beijing Qinghe Building Number 8 | Chen J.,Beijing Qinghe Building Number 8 | And 4 more authors.
Hedianzixue Yu Tance Jishu/Nuclear Electronics and Detection Technology | Year: 2010

It introduces the important meaning of the application of grey relational analysis on the monitoring point optimization of radiation background survey. It gives out the grey relational analysis theory. It also quotes some background survey results to demonstrate the method. The examples prove that this method has feasibility in the monitoring point optimization of radiation background survey.


Lei J.,Ordnance Engineering College | Fu J.,Ordnance Engineering College | Guo Q.,Army
ICQR2MSE 2011 - Proceedings of 2011 International Conference on Quality, Reliability, Risk, Maintenance, and Safety Engineering | Year: 2011

The observing system made up of panoramic annular lens (PAL) can observe objects around the lens, which fits for the quality inspection of gun bore. But there is serious distortion in the tangential and radial directions on the annular image formed through twice reflection. The paraboloid perspective projection model is proposed to correct the image distortion according to the imaging feature of PAL. Firstly, the PAL correction model which includes distortion parameters is constructed. The annular image is transformed back into a cylinder in three-dimensional space under this model. Then spreads out the curved image plane into a flat one. Meanwhile, the distortion parameters are obtained by adopting modified genetic algorithm according to the labelled image. Simulation and panoramic gun bore image experiments demonstrate that this algorithm could greatly correct the tangential and radial distortions and enhance the classified precision of gun bore flaw. © 2011 IEEE.


Wheatley R.J.,Army
Journal of the Royal Army Medical Corps | Year: 2014

The Role 1 orientated JRAMC of September 2012 was a welcome addition to the body of Role 1 literature. In particular, the Role 1 capability review by Hodgetts and Findlay detailed both current issues and future aspirations for Role 1 provision. This personal view considers issues still prevalent during Op HERRICK 18 namely the provision of primary healthcare by combat medical technicians on operations and the organisational issues that contribute to historical structural and attitudinal obstructions to the employment of combat medical technicians in firm base primary healthcare. It also considers a dynamically updating dashboard capable of displaying risk across the Role 1 network with the implied move to a model of continuous healthcare assurance.

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