Jiang H.L.,PLA Navy Submarine Academy |
Zhang H.P.,PLA Navy Submarine Academy |
Zhang H.P.,Navy Equipment Research Institute |
Xia Z.S.,PLA Navy Submarine Academy |
Qi H.,PLA Navy Submarine Academy
Applied Mechanics and Materials | Year: 2014
In order to reduce the impact of shaft-rate electric field (SRE) on the concealment of the ship, the factors that influence shaft-rate electric field are studied based on the analysis of its energy source. The ship electrical equivalent model is established by analyzing the structure of ship shafts, and on this basis, the electrical properties of the ship shafting is analyzed, laying the theoretical foundation for the study of shaft-rate electric field. It is shown that the bearing contact impedance changing is the important part of the ship shaft structure electricity analysis among the factors and its analysis is the base of research on shaft-rate electric field restrains technology. © (2014) Trans Tech Publications, Switzerland.
Sun J.-Y.,Shanghai JiaoTong University |
Jiao S.-J.,Shanghai JiaoTong University |
Zhang L.,Navy Equipment Research Institute |
Hua H.-X.,Shanghai JiaoTong University
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2013
To obtain shock absorption characteristics of a viscous fluid damper, a non-Newtonian fluid damper was designed and made, and then shock tests were performed for it under various height conditions. To analyze the damping force mechanism from the aspect of fluid dynamics, a modified power law function model was used to describe the viscosity of silicone oil, and the parameters of the model was determined with the measured viscosity data under various shear rates. CFD software FLUENT was adopted and combined with the dynamic meshing technology to obtain the characteristics of damping force under shock conditions. By comparing the results of tests and those of simulations, it was indicated that both the results approximately match each other and they can be used to guide damper designs.
Li Z.,Navy Equipment Research Institute |
Sun X.-L.,PLA Second Artillery Engineering University |
Lei J.-N.,Navy Equipment Research Institute |
Ji G.-X.,PLA Second Artillery Engineering University |
Liu Z.-Y.,Academy of Equipment Command and Technology
Xitong Gongcheng Lilun yu Shijian/System Engineering Theory and Practice | Year: 2012
A matrix decomposition algorithm was proposed for calculating exact reliability of multistate networks based on d-minimal cuts (d-MCs). This algorithm was more efficient than the inclusion-exclusion algorithm by means of decomposition principle, absorption law and definition of d-minimal cuts matrix and matrix probability. Based on recursive matrix decomposition and reduction, the algorithm obtained exact reliability by recursive matrix probability calculation. Furthermore, the algorithm reduced computational complexity by defining deletion function and dynamically selecting decomposition edge. This algorithm is characterized by clear structure, simple accomplishment and low computational complexity, which has an exponential relationship with the edge amount in the network.
Du X.,Shijiazhuang Mechanical Engineering College |
Zhu N.,Shijiazhuang Mechanical Engineering College |
Huang J.,Navy Equipment Research Institute
ICQR2MSE 2011 - Proceedings of 2011 International Conference on Quality, Reliability, Risk, Maintenance, and Safety Engineering | Year: 2011
An Interactive Electronic Technical Manual (IETM) is a digital package of information required for diagnosis and maintenance of equipment systems. Now, IETM authoring system can not obtain right information directly from modern product data management (PDM) system. This has resulted in an obstacle to the product logistic support design, postponed the delivery of equipment manual. This paper presents a solution to the above problem based on concurrent engineering idea and PDM technology. It offers a framework of a PDM-based IETM authoring system, points out that the key to implement concurrent developing of IETM should establish three basic data model to transform non-structured product information into structured IETM data. © 2011 IEEE.
Guan J.,Nanjing University of Science and Technology |
Yi W.,Nanjing University of Science and Technology |
Chang S.,Nanjing University of Science and Technology |
Li X.,Navy Equipment Research Institute
Mathematical Problems in Engineering | Year: 2016
This article details a new optimizing algorithm called Adaptive Chaotic Mutation Particle Swarm Optimization (ACM-PSO). The new algorithm is used to perform aerodynamic parameter estimation on a spinning symmetric projectile. The main creative ideas of this new algorithm are as follows. First, a self-adaptive weight function is used so that the inertial weight can be adjusted dynamically by itself. Second, the initialized particle is generated by chaos theory. Last, a method that can be used to judge whether the algorithm has fallen into a local optimum is established. The common testing function is used to test the new algorithm, and the result shows that, compared with the basic particle swarm optimization (PSO) algorithm, it is more likely to have a quick convergence and high accuracy and precision, leading to extensive application. Simulated ballistic data are used as testing data, and the data are subjected to the new algorithm to identify the aerodynamic parameters of a spinning symmetric projectile. The result shows that the algorithm proposed in this paper can effectively identify the aerodynamic parameters with high precision and a quick convergence velocity and is therefore suitable for use in actual engineering. © 2016 Jun Guan et al.
Xue R.-J.,Harbin Engineering University |
Xue R.-J.,Navy Equipment Research Institute |
Wang M.-Y.,Harbin Engineering University |
Li C.-J.,Harbin Engineering University |
Zhu H.,Harbin Engineering University
Harbin Gongye Daxue Xuebao/Journal of Harbin Institute of Technology | Year: 2012
To accurately know heat transfer and flow processes of AP1000 passive residual heat removal heat exchanger(PRHR HX), and provide a reference for the safe operation of our new AP1000 advanced pressurized water reactor nuclear power plant, FLUENT software is used. By comparative analysis of the distribution of temperature-field and flow-field in different locations at the same time, and the change of temperature-field and flow-field in the same location at different times, we can know the heat transfer and flow characteristics which are changed with time more intuitive, and analyze the effect of straight tubes and elbow tubes on the natural circulation. The results show that the temperature difference, vortex, flow around make the interaction of temperature field and flow field. Due to the influence of elbow tubes structure, the fluid natural convection in the IRWST is more complex.
Xue R.,Harbin Engineering University |
Xue R.,Navy Equipment Research Institute |
Chen Z.,Harbin Engineering University |
Li Y.,Harbin Engineering University
Hedongli Gongcheng/Nuclear Power Engineering | Year: 2014
Shared condenser have two steam imports, and it is consisted of two steam turbine. A dynamic mathematical model of the condensation system in shared condensation is presented based on the working principle of the system and structural. The operation characteristics of the shared condenser is simulated and analyzed and different dynamic characteristics of each subsection is obtained.
Yuan S.,Navy Equipment Research Institute
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2014
Put forward a compound eye possessing a wide field of view (FOV), which is characterized by small and compact structure. Based on the total reflection theory, the ommatidia on the edge of the compound eye are designed with free-form surface prism, which enables the light beams reflected inside the ommatidium. This contributes to ommatidia of small size and distortion decrease of the marginal ommatidia, finally image quality of the marginal FOV is dramatically enhanced and the FOV of the compound eye is broadened obviously. The size of the designed compound eye is Φ12.2mm×3mm, the FOV increases to 180°. However, the image distortion whitin the entire FOV is smaller than 25%. The MTF is still larger than 0.1 even at the frequency of 100lp/mm. The simulation of the proposed compound eye structure is conducted using the LightTools. Results indicate that there is no crosstalk between adjacent ommatidia and it can image with high quality. © 2015 SPIE.