铸钢用保温冒口及其应用研究

本文针对提高铸钢件冒口补缩效率问题，给出了微珠保温冒口的配方及生产工艺；并介绍了其在生产中的具体应用。保温冒口的使用，改善了铸件质量，并大幅度提高了企业经济效益。     

切削加工优化研究

本文通过切削加工机理的研究，建立了切削加工的数学模型，为难加工材料切削用量的选择提供了科学的方法。     

V型尾翼布局弹性体飞机操纵性分析

使用静气动弹性分析方法,对双尾撑V型尾翼布局飞机纵向静气动弹性特性随飞行动压、迎角、尾撑纵向弯曲刚度的变化趋势进行了分析,以期为类似布局飞机的设计提供参考。尾撑结构刚度对飞机的俯仰、偏航的操纵效率都有较大影响,需要结合飞行动压范围和质量要求合理选择尾撑结构的材料和尺寸,在设计时,严格控制尾撑的刚度指标。     

Design and numerical investigation of swirl recovery vanes for the Fokker 29 propeller

Swirl recovery vanes（SRVs） are a set of stationary vanes located downstream from a propeller, which may recover some of the residual swirl from the propeller, hoping for an improvement in both thrust and efficiency. The SRV concept design for a scaled version representing the Fokker 29 propeller is performed in this paper, which may give rise to a promotion in propulsive performance of this traditional propeller. Firstly the numerical strategy is validated from two aspects of global quantities and the local flow field of the propeller compared with experimental data, and then the exit flow together with the development of propeller wake is analyzed in detail.Three kinds of SRV are designed with multiple circular airfoils. The numerical results show that the swirl behind the propeller is recovered significantly with Model V3, which is characterized by the highest solidity along spanwise, for various working conditions, and the combination of rotor and vane produced 5.76% extra thrust at the design point. However, a lower efficiency is observed asking for a better vane design and the choice of a working point. The vane position is studied which shows that there is an optimum range for higher thrust and efficiency.     

双级高压涡轮气动性能试验状态模化方法

针对双级高压气冷涡轮的低温试验状态模化方法，对以空气为工质、基于不同相似准则数的试验模化状态的流场相似 性进行数值仿真。结果表明：对于有冷气试验模化方法，采用出口马赫数与设计状态一致的模化方法可获得相似性较好的试验状 态流场，此时反力度、载荷系数、马赫数均能保证良好的相似性，主要相似准则数偏差不超过5%；对于无冷气试验模化方法，保持 涡轮几何不变并增大膨胀比使得等熵速比与设计状态的一致，或通过改变叶片数保证各排出口马赫数与设计状态的一致，均能显 著改善无冷气模化状态与设计状态的流场相似性。其中前者反力度相似性接近98%，而后者载荷系数和马赫数的相似性达到了 同样水平，但破坏了模型的几何相似。     

大迎角耦合运动非定常空气动力特性

采用某飞机大迎角大振幅运动风洞实验结果，分析了大迎角非定常空气动力的一些特性。结果表明，飞机机动飞行时多自由度运动的气动特性比单自由度运动复杂，耦合运动时的气动特性和两个单自由度运动的气动特性的叠加结果相比有一定差别。此外，旋转天平实验结果同本实验的结果相比差别较大。     

基于混沌遗传算法优化神经网络方法的救护直升机效能评估与指标优化研究

采用遗传算法与神经网络相结合的方法研究救护直升机的效能评估,建立了评估指标与效能评估值的非线性关系,克服了传统线性评估方法的不足,结果表明GA-BP算法能够很好地评估救护直升机效能,并保持了很高的精确度;同时,采用BP-GA算法对救护直升机的指标进行了优化,结果同样表明该方法可以有效地优化救护直升机的指标.     

Minimizing energy utilization for growing strawberries during long-duration space habitation

Strawberry is a candidate crop for space that is rich in protective antioxidants and could also have psychological benefits as a component of crew diets during long-duration space habitation. Energy for electric lighting is a major input to a controlled-environment crop-production system for space habitation. Day-neutral strawberry cultivars were evaluated at several different photoperiods to determine minimum lighting requirements without limiting yield or negatively impacting fruit quality. The cultivars ‘Tribute’, ‘Seascape’, and ‘Fern’ were grown at 14, 17, or 20 h of light per day, and fruit yield was evaluated over a 31-week production period. This amounted to a difference of 2418 kWh m⁻² in energy usage between the longest and shortest photoperiods. All cultivars produced similar total fresh weight of fruit regardless of photoperiod. Volunteer tasters rated organoleptic characteristics including sweetness, tartness, texture, and overall appeal as measures of fruit quality. Generally, organoleptic attributes were not affected by photoperiod, but these attributes were somewhat dependent upon cultivar and harvest time. Cultivars under different photoperiods varied in their production of fruit over time. ‘Seascape’ was the most consistent producer, typically with the largest, most palatable fruit. ‘Seascape’ plants subsequently were grown at 10-, 12-, or 14-h photoperiods over a treatment period of 33 weeks. Photoperiod again had no significant effect on total fruit weight, although there were periodic flushes of productivity. Fruit under all photoperiods had acceptable approval ratings. A large-fruited, day-neutral strawberry cultivar such as ‘Seascape’ remains productive under shortened photoperiods, allowing reductions in energy and crew labor while maintaining flexibility for mixed-cropping scenarios in space.     

X射线辐照圆柱壳体产生的汽化反冲

暴露在x射线辐射场中的圆柱壳体,在吸收了大量的辐射能后其表层汽化。由于表层的汽化物质快速飞散,圆柱壳体将受到冲击载荷的作用。本文用气体动力学方法提出了计算作用在圆柱壳体上汽化反冲压力及冲量的理论模型。     

技术进步的两种测度公式及其效率——效益结构分析

本文考查了技术进步的测试方法,导出了技术进步的效率测度公式与效益测度公式;研究了资金（本）、劳动这两种生产要素的生产率增长率与收益率增长率间的关系,得出了工资增长率超过劳动生产率增长率所必须满足的条件。