电动舵机直流伺服电机选用方法

根据空空导弹电动舵机对直流伺服电机的要求,介绍了直流伺服电机输出力矩和转速的计算方法、电动舵机选用直流伺服电机的基本原则、电机发热校验的方法,提出了在电动舵机设计中应过载使用直流伺服电机的观点。     

超声波电机在制导武器执行机构中的应用前景探讨

本文探讨了一种全新的电动舵机，它用超声波电机代替了传统的伺服电机，具有响应快、无源自锁、不受电磁干扰、位置分辨率高、结构紧凑等特点。同时．也讨论了制约该舵机发展的几个因素。     

提高电动舵机动态特性的方法研究

针对导弹对电动舵机动态特性的要求,介绍了电动舵机的一般组成,分析了影响舵机动态特性的因素,研究了伺服电机、间隙、摩擦和控制器对舵机动态性的影响,提出了在工程实际中提高舵机动态性的方法。     

超声波电机在制导武器执行机构中的应用前景探讨

本文探讨了一种全新的电动舵机,它用超声波电机代替了传统的伺服电机,具有响应快、无源自锁、不受电磁干扰、位置分辨率高、结构紧凑等特点.同时,也讨论了制约该舵机发展的几个因素.     

BTT导弹电动舵机系统的可行性与可靠性分析

针对倾斜转弯(BTT)导弹自动驾驶仪的执行机构，采用电动舵机伺服系统的方案，进行了可行性论证和可靠性预测。分析结果表明，采用稀土直流伺服电机、滚珠丝杆与连杆组合传动装置以及变结构控制器组成的电动舵机伺服系统，不仅方案可行，而且十分可靠。     

电机转速饱和对电动舵机性能影响

针对目前常用电动舵机的结构和电机驱动控制方式,建立了电动舵机系统和驱动器的数学模型。PID控制是舵机系统控制中应用最广泛的控制算法,针对该控制算法研究了电机转速饱和对舵机系统的性能影响。当舵机系统跟踪大幅值信号时,由于电机转速饱和,舵机系统跟踪信号的相位滞后将增大,舵机系统的线性模型不再适用,对滚转弹的控制将带来不利影响。研究结论对滚转弹电动舵机系统指标的确定具有重要意义。     

一种微小型电动舵机设计仿真与试验

为满足微小型导弹用舵机体积小、质量小、响应快的特点,设计了一种高可靠性、高灵敏度、低成本、小型化的电动舵机伺服系统。经建模仿真和试验验证,该系统满足快速性、线性度、频带宽度等方面的指标,为舵机小型化设计及导弹微小型化设计奠定基础。     

BTT导弹电动舵机系统的可行性与可靠性分析

针对倾斜转弯(BTT)导弹自动驾驶仪的执行机构,采用电动舵机伺服系统的方案,进行了可行性论证和可靠性预测.分析结果表明,采用稀土直流伺服电机、滚珠丝杆与连杆组合传动装置以及变结构控制器组成的电动舵机伺服系统,不仅方案可行,而且十分可靠.     

电动舵机系统建模及控制算法

舵机是导弹控制系统重执行机构,其性能直接影响导弹命中精度;为了提高舵机系统跟踪精度与带宽,对直流无刷电动舵机系统分析、建模,设计经典PID控制器与指数趋近律滑模控制器;系统仿真表明：滑模变结构控制器在电动舵机控制方面具有优良的动态品质,满足舵系统指标求。     

导弹电动舵机的研究现状及发展趋势

在回顾国外关于导弹电动舵机的发展历史和研究现状的基础上, 着重分析了导弹电动舵机今后的发展趋势, 指出了导弹电动舵机的技术难点, 使大家对导弹电动舵机的发展有一个更加清楚的认识.     

Stability of the Third Generation Intensifier under Illumination

The stability under illumination of transmission-mode GaAs photocathode sealed in the third generation intensifier is investigated by use of spectral response testing instruments. The variations of spectral response with the illumination times under weak and intense illumination are compared. The variations of photoemission performance parameters are also characterized. The results show that during initial several weak illuminations photocathode behaves no evident decay and a maximum sensitivity is achieved, while under intense illumination the sensitivity of photocathode begin to decrease largely at the first illumination. The calculated performance parameters show that the variation of surface escape probability with illumination times is a direct cause of instability of photocathode. It is also found that under intense illumination peak wavelength is moved towards short-wave and peak response is decreased, which shows that the ability of long-wave response of photocathode is decreased.     

Open Rule-setting System Applied to Conceptual Design of Engines

Open rule-setting method advanced in this paper concentrates on providing designers of engines with a convenient way to express their design innovations and develop the expected prototypes in the early CAD stage, and constitute effective models for the following analysis process of CAE and CAPP. The problems arisen in the process of conceptual design with the traditional experience-based development method are analyzed. Based on those analyses, open rule-setting method is presented and some associated technical problems are discussed. The functional framework of open rule-setting system was built as software engineering methods. The speciality of the engine product as a kind of complex product and the requirement of the engine product based on its structural particularity to rule-setting system are considered carefully. A demonstration is supplied to illustrate how the open rule-setting method enhances the efficiency and quality of the engine conceptual design.     

Research on Linux Network Device Driver

By analyzing the working principle of Linux network device driver, discussing the Linux network driver structure and its key technologies, the general network driver structure and its design methodologies in Linux system are summarized. Through modifying the network device driver of Linux device driver 3rd version snull, c and improving the COW technology, the Zero-Copy technology in Linux （kernel version 2.6.11 ） is implemented. In the end, the success test tells us that the thorough analysis of network device driver is the foundation of many applications, and it also provides a certain improvement to a lot of real applications, even to military application development.     

Passive Acoustic Radar for Detecting Supersonic Cruise Missile

A Passive Acoustic Radar is presented as a necessary complement to electromagnetic wave radar, which will be expected to be an effective means for detecting cruise missiles. Acoustic characteristics of supersonic flying projectiles with diverse shapes are expounded via experiment. It is pointed out that simulation experiment could be implemented using bullet or shell instead of cruise missile. Based on theoretical analysis and experiment, the ““acoustic fingerprint““ character of cruise missile is illustrated to identify it in a strong noise environment. After establishing a locating mathematical model, the technique of acoustic embattling is utilized to resolve a problem of confirming the time of early-warning, considering the fact that velocity of sound is much slower than that of light. Thereby, a whole system of passive acoustic radar for detecting supersonic cruise missile is formed.     

Algorithm for Multi-laser-target Tracking Based on Clustering Fusion

Multi-laser-target tracking is an important subject in the field of signal processing of laser warners. A clustering method is applied to the measurement of laser warner, and the space-time fusion for measurements in the same cluster is accomplished. Real-time tracking of multi-laser-target and real-time picking of multi-laser-signal are introduced using data fusion of the measurements. A prototype device of the algorithm is built up. The results of experiments show that the algorithm is very effective.     

Super-resolution Restoration of Remote-sensing Images

A novel image restoration scheme, which is super-resolution image restoration algorithm Poisson-maximum-afterword-probability based on Markvo constraint （MPMAP） combined with evaluating image detail parameter D, has been proposed. The advantage of super-resolution algorithm MPMAP incorporated with parameter D lies in the fact that superresolution algorithm MPMAP model is discrete, which is in accordance with remote-sensing imaging model, and the algorithm MPMAP is proved applicable to linear and non-linear imaging models with a unique solution when noise is not severe. According to simulation experiments for practical images, super-resolution algorithm MPMAP can retain image details better than most of traditional restoration methods; at the same time, the proposed parameter D can help to identify real point spread function （PSF） value of degradation process. Processing result of practical remote-sensing images by MPMAP combined with parameter D are given, it illustrates that MPMAP restoration scheme combined PSF estimation has a better restoration result than that of Photoshop processing, based on the same original images. It is proved that the proposed scheme is helpful to offset the lack of resolution of the original remote-sensing images and has its extensive application foreground.     

Design and Simulation of TF and TA Controller for Missile

A nonlinear terrain following(TF) and terrain avoidance(TA) controller is proposed for missile control systems. Based on classical TF algorithm (adaptive angle method), a new method for TF controller is proposed by using angle of attack. A method of obtaining terrain outline data from digital elevation map (DEM) for TF control is discussed in order to save store space. A TA algorithm is proposed by using bank-to-turn technique. The block control model, which is suitable for backstepping design, is given for nonlinear model of missile. Making full use of the characteristics of the system and combining block control principle and backstepping technique, a robust controller design method is proposed. Uncertainties in every sub-block are allowed, and can be canceled by using the idea of nonlinear damping. It is proved that the state tracking errors are converged to a neighborhood of the origin exponentially. Finally, nonlinear six-degree-of-freedom simulation results for the missile model are presented to demonstrate the effectiveness of the proposed control law.     

Design and Analysis of Test Schemes of Static Postponing Time on Shrapnels Used to Riot Control

The test scheme of static postponing time given in our actual national military test standard on shrapnels used to control riot is a nine-point test scheme on the combined action of three kinds of temperatures and three kinds of pressures,the consumed ammunitions are more excessive. Statistic analysis and tentative checkout about a lot of test data are done,feasibility gists are put forward for optimizing of the test design scheme. The optimizing design and data analysis of test scheme of the item are done by managing uniformity design theory, two scientific and reasonable six-point test schemes are confirmed. The feasibility and reliability of the optimizing design schemes put forward above are proved ulteriorly by test validating. The gained schemes not only have good design uniformity and little ammunition wastage and meet the test demand, but also have better forecast ability for the result data of other points using the mathematic models from the actual test points.     

Influence of Installing Error on the Surface Shape Precision of the Axial Symmetry Aspheric Workpiece in Lapping

A method to calculate the surface shape error, which is caused by the installing error between the workpiece and the lapping tool in the process of form lapping, is proposed. The mathematical model which the installing translation error influences on the workpiece surface shape error is established. The changing rule of the error is simulated through the calculating example of the paraboloid workpiece. The results indicate that the surface shape error of the workpiece is increasing with the increase of the installing translation error, it is also increasing gradually along the center point of the curve surface to the edge, and the influence is severer to the curve surface with great curvature than that of the small curvature when the translation error is the same.     

Experimental Research on Output Performances of Giant Magnetostrictive Actuator

The paper introduces the performances of magnetostrictive actuators and its applications, discusses the design methods for the structure and internal magnetic circuit of a giant magnetostrictive actuator, and makes tests on the output displacement and force characteristics for an actuator using homemade magnetostrictive material. The experimental result shows that the actuator has satisfactory output precisions and ranges in transient and stable states, and can be used in lowfrequency vibration control system of precise equipment.