Yin X.,Hohai University |
Liu L.,Bengbu Naval Petty Officer Academy |
Zhao X.,Anhui Science and Technology University |
Ashraf M.A.,University of Malaya |
Ashraf M.A.,Universiti Malaysia Sabah
Polish Maritime Research | Year: 2015
The travel time tomography technology had achieved wide application, the hinge of tomography was inversion algorithm, the ray path tracing technology had a great impact on the inversion results. In order to improve the SNR of inversion image, comprehensive utilization of inversion results with different ray tracing can be used. We presented an imaging fusion method based on improved Wilkinson iteration method. Firstly, the shortest path method and the linear travel time interpolation were used for forward calculation; then combined the improved Wilkinson iteration method with super relaxation precondition method to reduce the condition number of matrix and accelerate iterative speed, the precise integration method was used to solve the inverse matrix more precisely in tomography inversion process; finally, use wavelet transform for image fusion, obtain the final image. Therefore, the ill-conditioned linear equations were changed into iterative normal system through two times of treatment and using images with different forward algorithms for image fusion, it reduced the influence effect of measurement error on imaging. Simulation results showed that, this method can eliminate the artifacts in images effectively, it had extensive practical significance.
Li F.,Yantai Naval Aeronautical and Astronautical University |
Hu Z.,Bengbu Naval Petty Officer Academy |
Zhao G.,Yantai Naval Aeronautical and Astronautical University
Proceedings of the Institution of Mechanical Engineers. Part I: Journal of Systems and Control Engineering | Year: 2016
This article is concerned with observer-based fault estimation and adaptive fault tolerant control for a class of continuous-time dynamical systems. First, a second-order sliding mode observer is proposed, which is capable to eliminate chattering effects for fault estimation caused by the conventional sliding mode observer. Second, in order to avoid the cumbersome stability proving process by the geometric method, a Lyapunov function is adopted to prove the observer error dynamical system. Third, based on the estimated fault information by the proposed observer, an adaptive fault tolerant control law is developed to guarantee the stability of the faulty system. Finally, the proposed method is applied to the Boeing 747-100/200 flight control system, and the simulation results verify the effectiveness of the proposed scheme. © IMechE 2016.
Yan B.,Wuhan Naval University of Engineering |
Guo H.S.,Wuhan Naval University of Engineering |
Li X.,Bengbu Naval Petty Officer Academy
Advanced Materials Research | Year: 2014
A new passive target motion analysis (TMA) based on method a single seismic-filed vector sensor is designed using pitching angle and multi-path delay is studied. The state equation and measurement equation are established and analyzed systemically by improvement particle filter based on the measurements of both bearings and time delay that are collected by the sensor. The Monte Carlo simulation experiment results demonstrate that the algorithm has some advantages of fast convergence, high precision and stability. © (2014) Trans Tech Publications, Switzerland.
Wang M.,Bengbu Naval Petty Officer Academy |
Zhou Q.D.,Wuhan Naval University of Engineering |
Wang Y.F.,Wuhan Naval University of Engineering |
Ji G.,Wuhan Naval University of Engineering |
And 2 more authors.
Advanced Materials, Structures and Mechanical Engineering - Proceedings of the International Conference on Advanced Materials, Structures and Mechanical Engineering | Year: 2016
Large-scale acoustic model experiments underwater are usually difficult, while airacoustic experiments in an anechoic room have a better efficiency and are easier to organize. If acoustic similarity in different fluids is discovered, the data gained in air-acoustic experiment can be used to calculate underwater noise. Via dimensional analysis, acoustic similarity in an arbitrary fluid is firstly studied. Then, via FEM/BEM method, using NASTRAN to simulate surface vibration and FORTRAN BEM program to simulate sound radiation, sound pressure of ring stiffened cylinder in water, air, and a virtual fluid is calculated. Theory analysis and numerical calculation both point out that when any 8 parameters in different acoustic systems among non-dimensional material density, non-dimensional material stiffness, Poisson ratio of material, damping coefficient of structure, non-dimensional exciting force, nondimensional sound velocity in fluid, non-dimensional coordination in sound field and non-dimensional sound pressure are the same, respectively, the last one should have the same value. © 2016 Taylor & Francis Group, London.
Li S.-Q.,University of Chinese Academy of Sciences |
Yang Y.-Z.,University of Chinese Academy of Sciences |
Xie Q.-L.,Bengbu Naval Petty Officer Academy |
Wang Y.,University of Chinese Academy of Sciences |
Chen F.,University of Chinese Academy of Sciences
Journal of Geology | Year: 2015
Late Mesozoic lithospheric extension in NE Asia resulted in the development of a large extensional province and widespread formation of volcanosedimentary basins. Songliao basin is the biggest in that region, situated between the Siberian and Sino-Korean (North China) cratons. The Songliao basin contains voluminous volcanic rocks as a major part of the basin fill. Volcanic successions form a significant but unexposed part of the late Mesozoic magmatic province in NE China. Here we report zircon U-Pb ages and geochemical data for felsic volcanic rocks from the Songliao basin. Zircon populations of two types of rhyolites with distinct I- and A-type affinities, analyzed by laser ablation inductively coupled plasma mass spectrometry, yielded similar U-Pb ages of 114 5 2 and 113 5 2 Ma, respectively. Whole-rock Nd and zircon Hf isotope data of the felsic rocks indicate an origin from newly formed crustal protoliths. The I-type dacites and rhyolites show geochemical signatures with subduction-related affinity, indicating generation by partial melting of juvenile crust that originated from melting of subduction-modified mantle sources, whereas the A-type rhyolites have higher heavy rare earth element and high field strength element concentrations and lower Ba/Nd ratios that are interpreted as evidence for melting of I-type felsic lower crustal sources in an intraplate tectonic environment. Typical geochemical compositions of A-type rhyolites indicate anorthite-rich plagioclase as a residual magmatic phase and imply melting at shallow crustal levels. The A-type felsic rocks were generated during a period of maximum lithospheric extension below eastern China around 110 Ma, and this thinning process was probably related to the retreat of the Paleo-Pacific trench. © 2015 by The University of Chicago.
Jia J.,Hefei University of Technology |
Jia J.,Bengbu Naval Petty Officer Academy |
Lu S.,Hefei University of Technology
Procedia Engineering | Year: 2013
In order to understand the fire damages on warship caused by non-contact explosion, a mission-oriented risk assessment methodology was developed in this paper. Firstly, an eight-step flow chart was proposed to analyze the fire effect on a warship, and the main factors, which determined the fire consequences, were summarized. Then based on the specialist marking methods and statistical data, the fire damage on warship could be calculated by using Bayesian Networks, which is a nice tool to assess the risk for complicated system. Finally, the methodology was applied a hypothetical ship with five compartments. The results show that fire intensity mainly depends on the fuel load and the fire damage depends on the function occupancy rate. Moreover, the result of sensitivity analysis indicates that fire damage could be effectively reduced by some ways, such as decrease leakage caused by shock, shorten the response time of fire detection and so on. © 2013 International Association for Fire Safety Science.
Fang Q.,Bengbu Naval Petty Officer Academy |
Wang Z.,Automobile Management Institute |
Mei D.,Automobile Management Institute
Proceedings - 2013 International Conference on Computer Sciences and Applications, CSA 2013 | Year: 2013
The Principal Component Analysis(PCA) is used to aggregate the recognition attribute, in order to decrease the association of each attribute and reduce the attribute. The Neural Networks is used to recognize the target. The use of optimizing policy can improve the constringency speed and the generalization ability of the Neural Networks. The combination of Principal Component Analysis and Neural Networks not only can recognize the target in high efficiency, but also can have the ability of self-study and adapting which can recognize the target in naval battlefield. A simulation is given to prove the efficiency of this algorithm. © 2013 IEEE.
Liu L.,Bengbu Naval Petty Officer Academy |
Xiong Z.,Bengbu Naval Petty Officer Academy |
Hu H.,Bengbu Naval Petty Officer Academy
Advanced Materials Research | Year: 2013
W-type hexagonal ferrite BaZn0.6Co1.4Fe16O27 was prepared by the method of coprecipitation with flux. Various products were prepared by different thermal treatments. The microstructure, element composition, crystal structure, phases and dynamic electromagnetic parameters of the products were analyzed by SEM, EDS, XRD and the microwave vector network analyzer. The formation of the ferrite was studied and the optimal thermal treatment condition was confirmed, under which pure tiny W-type hexagonal ferrite powders were achieved. © (2013) Trans Tech Publications, Switzerland.
Tao H.,Bengbu Naval Petty Officer Academy |
Liu L.-N.,Bengbu Naval Petty Officer Academy
Proceedings - 2013 International Conference on Computational and Information Sciences, ICCIS 2013 | Year: 2013
We study the advantages of the DOA and TDOA methods in passive locating algorithm. DOA method is simple and less computation, but the precision is relatively poor; TDOA method has high precision, but the demand of time unification is very high for each observation station, the system is more complex, however the positioning error is high for low altitude target. So an improved hybrid positioning LS weighted method is presented. First we calculate the target localization by a master station and a secondary station measurement information in turn with LS estimation, then fuse several positioning results which are calculated with different secondary station measurement information. Through the introduction of appropriate weighting factor, we get the final radiation source location coordinates. The simulation result shows the effectiveness of the improved LS weighted method. © 2013 IEEE.
Chen X.,Bengbu Naval Petty Officer Academy |
Shen S.,Bengbu Naval Petty Officer Academy
Advanced Materials Research | Year: 2013
Represent a new Weapon-Target Assignment (WTA) model of warship fleet as to the characteristic of the modern naval battle field and the battle modality. This model considers the WTA to a multi-objects optimization problem, and a Fast and Elitist Non-Dominated Sorting Genetic Algorithm (FENSGA) is applied to resolve this model. The FENSGA can reach a set of wide-distributing, robust solution. One running of the FENSGA can reach a multi-Pareto solution, which the commander can select from. A simulation is given to prove the validity of this model and algorithm. © (2013) Trans Tech Publications, Switzerland.