Using the CFX mesh module of ANSYS Workbench software, the grid model of the engine cylinder head and cooling water channel was built up and the interface of the solid and fluid, was cou?pled to realize the heat transfer. In the CFX module of ANSYS Workbench software, using the method of dispersing and resolving in together, the grid model was calculated and the flow field of the water and the temperature field of the cylinder head and the temperature field of the interface were ob- tained under condition of rated power. They provide gist for further calculating thermal stress and thermal distortion.

Test-equipment selection is an important part in the systemic testability analy

The toss motion is a trouble for amphibious vehicle in sea-way. It may severely affect the battle effec?tiveness of crew in the vehicle. A linear toss motion in wave was described based on the wave resistance theory for snips in this paper. Resonance frequency and damping coefficients of vehicle and mechanism of suspension and propelling in roll and heave motions were obtained by experiment. Then, these coefficients are used to ana?lyze the possible toss motion of three typical vehicles in a sea area of our country.

2-axis gyro stabilization is widely applied to the mobile operational platforms to stabilize collimator, artillery, radar and antenna, etc. The angular velocity compensations of carrier attitude measurement are differ?ent if the installation modes of gyros are different. Based on the principle of the stabilized theory and gyro atti?tude measurement theory, a mathematic model was established. According to a mathematic expression, three in?stallation modes were summarized. In the end, an application example was introduced.

A adaptive backstepping sliding mode control approach was introduced to control the pitch motionof a rocket gun. Its control law was proposed to guarantee that the control system was ultimately bounded in a Lyapunov sense and make the servo system could track the instruction of reference position globally and asymptotically. In addition, the sliding mode control can restrain effects of parameter uncertainties and external disturbance. The functions of adaptive mechanism and sliding mode control were analyzedby using simulation under different conditions. The simulation results illustrate that the method is applicable and robust.

The erosion and wear of gun barrel can reduce the gun barrel erosion life and restrict the gun development. The new technologies to extend the erosion life of gun barrel are summarized m this pa-per including laser heat treating of the inner face of gun barrel, manufacturing of composite gun barrel and coating of the inner face of gun barrel. Then every technology was studied according to the struc-ture and principle of gun barrel. In the end, a suitable method to extend the erosion life of gun barrel was proposed.

Accelerated life testing (ALT) and accelerated degradation testing (ADT) are two main kind of reliability accelerated testing technology. AL T is abroad studied by both statisticians and relia?bility engineers, but there are just a few researchers who study the theory and engineering practice of ADT. The comparison between ADT and ALT technologies, related background, degradation models, data analysis methods and design and optimization of ADT are described. The recent statuses of ADT technology and engineering application are summarized. The key techniques of ADT are also explored and some suggestions are given for further researches.

The effect of “unchangeable force” ammunition ramming on the muzzle velocity was analyzed and quantitatively studied for the issues existing in the semi-automatic loading device of self-propelled gun. The solutions of unchangeable force ammunition ramming were presented.

Based on the recent researches of the author and his collaborators on penetration acceleration test, the paper summarizes and reviews the researches both in China and abroad on high g acceleration field test during projectile penetration into hard target with high velocity for over the last decade，especially the on-board test application in acceleration test. The paper also summarizes correlative technology on penetration acceleration test, including the anti-high shock capability and calibration of accelerometer, and the anti-proshock ability of battery. At last, based on the existing research works and potential national defense demands, the development trends and problems worth of consideration in the field are demonstrated.

Some shortcomings oi current” statistical model for maneuvering target are discussed ? The applicable bound of modified Rayleigh distribution was derived. Based on the result, a new “current” statistical model de?scription was proposed. Computer simulation by MATLAB shows that the tracking accuracy of the new method is preferred, to tKe old one.

The features of double-walled cylindrical explosion containment vessels closed with flat heads are presented. Experimental research has been conducted to investigate the dynamic elasto-plas- tic response of the vessels to the blast loading produced by the detonation of high explosives positioned within vessels. With the double-layered structure and the thin wall cylinder energy-absorbing system， the explosion wave and high-speed fragments were successfully sustained within the container.

On the basis of an introduction on the basic principle of the simulation test system of gun recoil，the paper establishes the numerical calculation model by combining gun recoil witn interior bal?listics according to the system’s characteristics. Numerical calculation is made for two different types of guns and its results are contrasted with test. The results oi numerical calculation show good agree?ment with simulation tests. Numerical calculation plays an important part in the simulation test.

A missile visual simulation system was designed by OpenGL and the flight path and flight attitude in different status of the missile were displayed vividly. The establishment problems of the 3D scene were presented including construction and redeployment of a model, creation of the virtual scene, setting of the multi-viewports and multi-windows etc. The missile’ s data driver, system flow, the modules and their mutual relations of the missile visual simulation system are discussed. A missile flight simulation results and the effect of the scenes were given.

A interior ballistic mathematical model of steel gasbag ejection machanism of cluster muni?tion was presented, including the processes of propellant combustion, steel gasbag charge, and bullet dispersion. The interior ballistic performances of this system were calculated to obtain the pressure in pressure chambers, the velocity and acceleration of submunitions using a simulation method. The sim?ulating results show that the dispersing results by simulating are similar to those by testing.

Basea on the convergence analysis of discrete errors on the basis of comparison with experi?ment, a V6 diesel engine’s finite element models oi its chief components and assembly have been estab-lished. Adopting the Lanczos method, their free-free modal computations have been conducted. Evaluations have been made on the dynamic characteristics of the modified scheme，and conclusions drawn from the analysis have been successfully adopted in the redesign of the diesel’s structures.

A dynamic analysis method for the flexible cage dynamic formula of high-speed angular contact ball bearing was described. The flexible cage dynamic formula of high-speed angular contact ball bearing computational formulation was established using a modified Craig-Bampton component mode synthesis method based on angular contact ball bearing dynamics analysis. The dynamic characteristics of cage of high-speed angular contact ball bearing was analyzed using rigid-flexible multi-body dynamic analysis program ADAMS, and was verified by the computation example of Gupta. The results show that the rotary smoothness of cage will be broken if the ratio of pocket clearance to guided clearance and the ratio of radial load to axial load become too large or too small. The flexible cage runs more smoothly compared to the rigid cage.

SSGT configuration and procedure have been used to investigate the influence of particle size and gradation of the base explosive HMX on the shock sensitivity and output of a PBX explosive. The particle size of HMX under investigation varies from 1μm to 150μm and the densities of samples adopted are taken at 90% and 95. 5% in TMD. The trend of influence of particle size and gradation of the base explosive upon the shock sensitivity and output of the composition explosive have been revealed. These results are significant in the choice of particle size of base explosives for booster explosives and other explosive compositions.

Stable scanning is one of the key items in the study of target-sensitivity projectile (TSP). On the basis of analysis of both the advantages and disadvantages of existing stable scanning techniques, the pa?per puts forward a new way to realize stable scanning using a 'tip-weighted single fin, that is, using a strongly-asymmetric mass and aerodynamic means in analyzing the system’s mechanical situation, and es?tablishes a two-body kinetic model. By discussing the method of eliminating and simpliiymg the restriction of force and moment in this model, the paper develops the standard-form equation set suitable for program?ming in a computer, and programs it. A numerical example shows that this kind of structure can realize sta?ble scanning. So the structure can be used in stable scanning, and the kinetic model can be used in the study of TSP total design and its scanning equipment design.

The index system of evaluating torpedo operational effectiveness (TOE) was brought for?ward and the subordinate function of each index was given. The fuzzy multifactorial evaluation model of TOE was presented based on BP neural networks. The method can conquer the limition of subjec?tive factors and repeat the knowledge, experience and thought of experts. The simulated result shows effectiveness and feasibility of the model.

Deals with the surface alloying of cast iron by the Xu-TEC process. Microstructure composition and properties of the alloyed layers are introduced. Effects of some factors on the formation of the alloyed layer are analysed , including temperature, cycle time, discharge condition and the composition of the cast iron.

Multidisciplinary design optimization (MDO) is a new solution to design large complex systems. This paper gave parameter representations in MDO and analyzed the disciplines and variables involved in torpedo design, represented models with three MDO methods, that is, multidisciplinary feasible method (MDF), individual discipline feasible method (IDF) and collaborative optimization (CO). At the end, these three models were analyzed with their own properties.

The influence of LFM interference on correlation detection performances of the pseudo-ran?dom code fuse was analyzed. It is found that the correlation output is deteriorated when the LFM in?terference power exceeds the anti-jamming limitation of the fuse itself. Thus, the LFM interference must be excised before correlation. By analyzing the fractional Fourier transform (FRFT) result of LFM signal, a method of excising LFM interference in fractal domain was put forward. To avoid the disadvantage of useful signal loss with the fixed threshold when strong interference exists, a method of adaptive threshold was proposed. Simulation results show that it can excise the LFM interference ef?fectively, ameliorate the correlation output and improve signal to jamming ratio.

Damping material optimal placement in damping structure design was studied. A mathemat?ical model of the modal loss factor maximum was constructed, and the damping material optimal place?ment was found by evolutionary structural optimization(ESO) . The method is suited for free damping structure and constrained damping structure, by using less material.

The shear characteristics models for aescriDmg the Takelamagan desert sand in Xinjiang under a moving vehicle and methods for determining their parameters are studied.丄 he index for evaluating the terrain shear characteristic models is set up. Based on the viewpoint of vehicle walking characteristics, shear stress-displacement rela?tions of the sand are tested and an optimum snear characteristics model for the descrip?tion of sand is obtained. These results lay a foundation for developing sand traversing vehicles, exploiting desert resources and crossing through desert areas in military opera?tions .

A close-loop control of the electro-hydraulic buffering control in the vehicle transmission was realized by applying an electro-hydraulic proportional decompressing valve and a dynamic math model was created. On the basis of simulation and experimentation, the dynamic characteristics of electro-hy- draulic proportional buffering control system with PID and DMC control were discussed.

The influence of firing order and firing interval on vibration characteristic and firing disper?sion of multiple launch rocket system (MLRS) was analyzed. The method to improve firing dispersion by optimizing firing order and xirmg interval was presented. Using transfer matrix method of multi?body system and launch dynamic theory, the relations between the firing order and firing interval vs. performance of MLRS were established. The new technology is developed by optimizing firing order and iiring interval of MLRS. The test results show that firing dispersion of MLRS is improved.

It is the most important R&D criteria for airborne armored vehicle to optimize the hull structure assured of both strength and weight control. The structure analysis simulation depends on the data of vehicle airborne test. The finite element model for the aluminum alloy body and its welded joint was built. The landing process of the vehicle was simulated by dynamic nonlinear finite element method. The transient results of displacement, strain and stress under normal, worse and worst air?drop conditions were obtained. The simulation results are in agreement with the actual experimental data, indicating that the finite element model and the simulation method are correct. The improved design for the body structure is provided.

A numerical simulation analysis of a high power density(HPD) diesel engine (volume power approaches 92 kW/L) perhaps used in the field of the military target is carried out in this paper. The main factors which influence the performance of engine were touched upon, and the key measures were also presented.

Augmented reality is an evolving field of virtual reality technology widely adopted in business applications. Recent developments of the technique and device in augmented reality system for military use were presented. Requirements of augmented reality system for military use were analyzed and their future application prospects in information battlefield were discussed. The significance of augmented reality in military use were further illustrated.

Presents the interacting process between an abrasive waterjet and the material being cut. rhe principle diagram and main features of a 270MPa ultrahigh pressure abrasive waterjet cutting system are given. The influence of pressure ratio oi mtensifier and accumulator volume on the pressure fluctuation are explored by experiment. The relationships between the cutting speed and pressure fluctuation, pressure of system, cutting parameters and the abrasive are tested and analyzed. The results obtained have practical meanings for the development and application of ultrahigh pressure abrasive waterjet cutting system.

Using the detected signals of a three-axles magnetometer, a real-time EMRES (equable magneti?zation rotation elliptic-sphere) model can be established. A statistic test algorithm is developed to judge the signals to be from a moving on water magnetic object or not. The magnetic state of the object is also esti-mated. Experiments show that this technology can detect moving object reliably with low-false alarm proba?bility even if the SNR is lower than zero (dB) and the frequency band of signal and background noise is heavily overlapped, and it also possesses target recognizing ability.

A new method which uses a pair of spatial isolated coils in a strongly coupled magnetic resonance regime to achieve the wireless power transmission and information synchronous setting between setter and fuze was proposed based on magnetic resonance theory in order to meet the requirement of weapon systems for power and information efficiency and high-quality synchronous transmission at long distance (meter level) and to solve the problem of widely used electromagnetic induction setting mode for short distance (millimeter level). A circuit model of magnetic-resonance wireless power transmission system was established. Resonance frequency splitting phenomena was observed by analyzing the mutual inductance coupling model, and the exact analytical solution of intrinsic extremum angular frequency was given. Further more, the transmission characteristics of the system in frequency domain and time domain were analyzed by Orcad simulation software. It is found that the current amplitude in pickup coil loop varies sensitively with the operating frequency, and the start-up time of system in resonance condition is microsecond level. The theoretical analysis and simulation results indicate that the method synchronous transmission of wireless power and information is effective and feasible.

The paper presents a model that can be used to obtain accurate firing data of shipbome gun weapon system by solving external ballistic equations. The model presented in the paper includes the method to calculate the firing data and flight time with the target position by solving the external ballistic e- quations once only, as well as methods to correct the informal ballistic and meteorological conditions, move?ment of the ship and the side deviation of projectiles. The method presented in the paper can be used to re?duce the calculation of finding firing data of the shipbome gun weapon system by solving the external ballis?tic equations, thus raising the calculation speed.

The influence of particle size and gradation of RDX particles on the shock sensitivity of a polymer bonded explosive RDX/F2641 (95 /5) with different dencities was experimentally investigated by small scale gap tests, In this study, the particle size of RDX is changed from Iμm to 150 μm, densities of the compos?ite formulation are 80% , 90% and 95 % TMD. Generally, shock sensitivity decreases with the increase of mean particle size of RDX, but the tendency of influence in different dencities are different. The results mainly represent the effect of particle size of explosive on the hot spot ignition under test conditions.

The influence of electrode structure on the sensitivity of proximity capacitive sensors is studied. The paper presents a kind of capacitive sensor with shielded elecrtode by summing up the relationship between sensitivity and structure of several types of proximity capacitive sensors. The equivalent capacitance is studied before and after a target draws near. Formulation of sensitivity and theoretical analysis is given. Through a series of tests it is verified that the sensor has higher sensitivity and longer detecting range.

There exist many failure models in a redunant structure, it is rather complicated to calculate precisely the failure probability in a structure. In this paper, a simple method is proposed to evaluate the failure probability in structures. Based on the bounding criterion and the formulation of the maximum contribution of the excluded failure modes to the structure failure probability, the lower and upper bounds of failure probability are estimated by branching and bounding operations selecting only the dominant failure modes to complete the calculation of failure probability in a structure. A numerical example is provided to demonstrate the validity of the proposed method.

High reliability and safety are the main criteria for a successful design of man-machine sys?tems (MMS). Operator’s dependence is defined through response(R), as a function of stimulus (S) and organism (U). Based on the identification of operator’s key performance shaping factors, an operator be?haviour shaping model is proposed，incorporating an analysis of the ability of self-adaptation or self-study of the operator, that is able to correct errors from a critical situation. An expression for operator9 s reliability as some parameters is derived from the operator behavior shaping model, and such parameters are obtained from data of accidents or faults in MMS. An application of the reliability model to man-machine systems with vehicle is given as a sample case. The relationship between human reliability and operator’s depen?dence is discussed m detail.

The configuration of piezoelectric sensors and actuators for the cantilever beam is studied. Firstly, a finite element formulation for the vibration of composite beam was established. The finite el?ement analysis(FEA) is then used to analyze the configuration of piezoelectric sensors and actuators. Considering the control of each of the first five vibration modes, the FEA was combined with the ge?netic algorithm (GA), a new configuration method oi the sensors and actuators was developed.

Characteristics and causes of formation of adiabatic shear bands in 30CrMnMo armor steel plate are analyzed. It is shown that the adiabatic shear bands don，t occur in the initial stage of launching and plugging. They occur in the stable penetrating stage because of enough strain. The adiabatic shear bands distnouting sparsely make an angle of about 45° with penetrating direction. The critical shearing strain forming the adiabatic shear bands is about 0.47 and the critical temperature is about 391℃? Non-homoge- nous deformation and centralizing of stress and strain in the adiabatic shear bands will cause micro-crack and micro-pores during cooling of the plate.