气体静压向心轴承静态特性的理论分析

本文根据简化的二维流动模型,提出一种新的计算方法,用以计算小孔节流气体静压向心轴承的承载能力和刚度。该计算方法简单方便,理论计算结果与实验结果很接近,适合于工程上的实际应用。     

单传力承力结构疲劳全寿命分析

根据某歼击教练机疲劳定寿要求，从工程角度对机翼主梁根部疲劳危险孔进行全寿命分析。     

飞机俯仰敏捷性的数字仿真与模拟试验

借鉴国外研究飞机俯仰敏捷性机动的经验，选用了俯仰敏捷性评价尺度，确定了数字仿真用的数学模型以及操纵规律，具体计算某机在常规空战飞行高度和速度范围内的俯仰敏捷性，包括加到最大过载所需的时间和卸到零过载所需的时间，最大正过载变化率和最大负过载变化率及最大上仰和下俯机动范围内的俯仰角速率。最后在地面固基模拟器上进行俯仰敏捷性机动模拟试验，试验结果与数字仿真结果基本一致。     

基于混合遗传算法的航空发动机数学模型解法

针对发动机模型现有平衡方程迭代解法存在不收敛或计算效率差的不足,以涡轮风扇发动机为对象,结合遗传算法与牛顿-拉夫逊法的优点,设计了在模型不收敛点采用遗传算法与牛顿-拉夫逊法交替计算的平衡方程求解混合算法。理论分析与数值仿真结果表明,对于整个模型而言,该算法既保持了牛顿-拉夫逊法的高计算效率,又吸收了遗传算法全局收敛的优点,可实现模型大范围收敛。     

基于单CPU的通用微机冲击振动控制技术

基于单ＣＰＵ的通用微机冲击振控制技术的独到之处在于，冲击驱动信息的生成、修正以及冲击响应信号的采样、分析等操作均由微机软件进行控制。主要介绍实现该技术的软件设计原理，并给出相应控制实验结果。     

单向陶瓷基复合材料任意应力本构行为快速计算方法

为了实现快速预测陶瓷基复合材料(CMCs)任意应力加卸载作用后的损伤状态和本构行为,对CMCs任意应力加卸载力学行为进行研究。提出了任意应力加卸载曲线简化方法,得到仅包含决定CMCs损伤状态的等效载荷曲线。基于剪滞模型,直接给出CMCs在等效载荷曲线作用后的滑移区分布,避免对载荷曲线的逐点计算。进而预测了材料的损伤状态和应力应变行为。将原始加卸载曲线带入剪滞模型,计算CMCs滑移区分布和应力应变,并与本文提出的方法进行比较,结果表明,两种计算方法计算的结果一致,说明了本文提出的载荷曲线简化方法和滑移区分布计算方法是可行的。     

Space exploration and human survival

I am sympathetic to the view that, given the likelihood of massive natural disasters, such as collisions between the Earth and large asteroids, we should engage in large-scale space exploration and colonization so as to hedge our bets against extinction. I will consider several criticisms of this view. For example, some philosophers may raise objections against the notion of long-term human survival as a value. How can we have obligations towards beings who have not even been conceived yet and thus cannot be properly said to have rights? On a different note, Wendell Berry argues that the abundance of resources in space will produce bad character, for good character requires the discipline of finitude. Others challenge the connection between space exploration and survival, for they fear that by entertaining the promise of new Earths in the heavens we are more likely to neglect our planet, thus leading to our downfall. Presumably, we should instead increase our efforts to restore and preserve the balance of nature. I will advance a variety of replies. For example, we do decide for posterity to a great extent. We may plant the trees from which “our” descendants will receive nourishment and shade, or we may destroy what could have given them a fighting chance against drought and famine. We have an obligation not to plant a bomb that will go off two years from now in a hospital nursery, and another to ensure that the buildup of chemicals in the hospital water tank will not reach critical mass and kill most of the newborns in ten years. The “balance of nature” involved in another objection is a myth that cannot be justified by natural history, whether astronomical or biological. Moreover, the inevitable changes in the environment, independent of asteroid impacts, will make the Earth uninhabitable in a few hundreds of millions and years. In addition, in order to act wisely we need an understanding of the Earth as a planet, and this requires the exploration of space.     

某发射装置扭板式平衡机的设计

针对某飞行器发射装置的结构特点，给出了扭板式平衡机设计主要参数的计算及其加工工艺。相应的扭转测试表明，试验结果与计算结果基本一致，平衡曲线平滑，性能满足总体要求。     

飞机作动筒耐久循环加载试验计算机控制系统设计

介绍某飞机作动筒耐久循环试验电液伺服和加载控制系统的设计。该控制系统以工控机为核心，实时完成载荷谱的分解计算、控制信号校正、试验数据的采集和处理。     

计算机集群技术在测控系统中的应用研究

本文介绍了计算机集群技术的特点，结合测控系统的应用现状及需求，着重针对数据处理、通信接口和存储系统三个方面，提出了将集群技术应用于测控计算机系统的解决方案。