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提出了母弹自适应引信的概念,建立了子弹群对目标的最佳覆盖效果准则,定义了引信控制母弹开仓的最佳开仓条件,提出了利用母弹和虚拟子弹的弹道确定最佳开仓条件的方法,讨论了自适应电子时间引信控制开仓点的时间调整方法。 相似文献
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Micro liquid dispensing technology is widely used in the field of electronic packaging. This study presents a lumped parameter model of a needle-type piezostack-driven jetting dispenser, which can produce small high viscosity adhesive droplets with a high driving frequency. After describing the structural components and operating principles of the dispenser, a lumped parameter model for the system is derived by integrating the sub-models of the structural and fluid parts. According to the lumped parameter method, the fluid channels of the dispenser have been divided into several lumps to obtain a more accurate performance. Based on the proposed model, the jetting dispenser is designed and manufactured, and its performance is then evaluated through both computer simulations and experiments. Further experimental studies about its working properties based on the proposed dispenser are carried out. The results are used to guide the design and control works about the proposed dispenser. 相似文献
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To measure the flow dynamics at the surface of shallow water flows over a large measuring field, a simple and reliable method has been developed using the advantages of Particle Image Velocimetry (PIV). Besides the determination of mean flow conditions and turbulent flow characteristics, this method makes it possible to track two-dimensional large coherent structures, which are the dominating flow phenomena in many shallow flow applications. As basic equipment, a commercial PIV software system has been used. The measurements are carried out at the water surface, which means that no laser light sheet is needed. Depending on the time scales of the flow and camera characteristics, it is even possible to work with a constant light source. A particle dispenser to provide a homogeneous distribution of particles on the water surface is also presented. Because floating particles have a strong tendency of sticking together, different types of particles and special coatings have been tested to reduce this problem. A laboratory application of this method is presented to analyze the effects of shallow dead-water zones on exchange processes in rivers where large coherent two-dimensional flow structures in the mixing layer dominate the flow characteristics. 相似文献
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Jung Woo Sohn Juncheol Jeon Minkyu Choi 《Journal of Adhesion Science and Technology》2018,32(4):359-374
In this work, critical operating factors of a jetting dispenser driven by a dual type of the piezostack actuators are experimentally identified. As a first step, geometrical information and working principle of the jetting dispenser are briefly addressed. Subsequently, in order to investigate jetting performance eight important operating (or working) factors of the dispenser such as exciting stroke and frequency are chosen based on two levels for each factor. Then, in order to reduce the number of experiments, one-sixteenth fractional factorial design method is adopted and an experimental apparatus to measure the weight of a single dot is established. After measuring the weight of a single dispensed dot under each test condition, the effect of each operating factor on the jetting performance is analyzed using a statistical program. The main effects and interaction effects on the average and standard deviation of the weight of a single dispensed dot are then analyzed and discussed in details. In addition, the analysis of variance results for average single dot weight is undertaken to determine the specific values of the critical factors which can provide optimal jetting performances. Consequently, critical operating factors for a small amount and small weight variation of a single dot are identified, which directly represent the performances of a non-contact jetting dispenser driven by piezostack actuators such as dotting accuracy and dotting speed. 相似文献
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燃料电池汽车的推广需要地面加注系统的支持,研制加氢机势在必行。本文介绍了压缩天然气(CNG)加气机的功能、系统构成和工艺流程,根据氢气和天然气的性质参数对比,提出了加氢机设计在材料、电气设备、安全设施等方面需要注意的问题,这对于加氢机的研制有重要的参考价值。 相似文献