操纵评分自动管理系统在机务系统的应用

研究一种新模式,对乘务员机车标准化作业、乘务员档案信息等进行自动管理、统计和考核,代替原有的人工模式,加强管理者对机务行车部门的管理,提高管理的效益和水平,同时也确保运用行车的安全,使机务系统信息化得到进一步提高。     

某型螺旋桨发动机连接螺栓预紧力研究

对某型螺旋桨发动机1个重要部位的连接螺栓进行了预紧力研究。介绍了螺栓预紧力的计算和螺栓的静强度、疲劳强度校核方法,得出了试验和改型机用该连接螺栓的锁紧力矩。     

导弹控制系统长期加电可靠性分配方法研究

介绍了几种常用的可靠性分配方法,分析和比较了这几种方法的适用性,提出了控制系统长期加电的可靠性分配方法.该方法依据工作时间长短对原有控制系统可靠性指标进行修正,并采用专家评分法思想计算出各单机设备的修正值.     

SEM在霉菌研究中的应用

简要介绍了扫描电镜(SEM)产生和发展的历史,并阐述了它的基本组成和工作原理, 最后论述了扫描电镜在研究霉菌的生长、繁殖和死亡等方面的应用。     

冷热加工技术在铝合金薄壁零件中的应用

通过分析工艺系统动、静误差及工件安装误差,提出了一种铝合金薄壁零件冷热加工方案。该方案通过合理选用刀夹具、切削用量、冷却液及多次走刀、稳定化时效处理,有效地控制了铝合金薄壁零件的加工变形,质量稳定可靠。     

电推进系统工质氙气充装特性试验研究

文章介绍了卫星电推进系统工质氙气充装特性试验系统及测试方法,开展了氙气充装饱和蒸气压,气相及超临界状态PVT充装特性试验研究,建立了新的氙气饱和蒸气压方程,拟合得到了氙气的临界压力,并与其他研究机构的试验数据进行了比较分析。氙气饱和蒸气压试验结果与NIST方程计算值的相对偏差小于0.2%,发现并验证了NIST方程计算值在近临界区的偏差最高达到6 kPa。试验数据为建立氙气充装加注预估模型奠定基础,为卫星电推进系统充装加注及在轨应用提供重要的参考。     

一种飞机升降舵需用功率的计算方法

为提供舵面需用功率的计算依据,对工程作动器的设计提供理论支撑,提出了一种飞机升降舵需用功率的计算方法,通过不同类型飞机实例进行计算。首先,针对不同种类的工况进行阐释,并详述速率计算所用的评价准则;然后,提出带载荷平均速率计算方法步骤,分析铰链力矩特性;最后,通过计算空载速率,分析舵面需用功率,并进行计算分析。计算结果表明,该方法计算出的需用功率不仅保证稳定裕度,且与舵面载荷具有理论相关性,设计结果安全合理,对工程设计具有实用指导意义。     

A study on optimal control of the aero-propulsion system acceleration process under the supersonic state

In order to solve the aero-propulsion system acceleration optimal problem, the necessity of inlet control is discussed, and a fully new aero-propulsion system acceleration process control design including the inlet, engine, and nozzle is proposed in this paper. In the proposed propulsion system control scheme, the inlet, engine, and nozzle are simultaneously adjusted through the FSQP method. In order to implement the control scheme design, an aero-propulsion system component-level model is built to simulate the inlet working performance and the matching problems between the inlet and engine. Meanwhile, a stabilizing inlet control scheme is designed to solve the inlet con-trol problems. In optimal control of the aero-propulsion system acceleration process, the inlet is an emphasized control unit in the optimal acceleration control system. Two inlet control patterns are discussed in the simulation. The simulation results prove that by taking the inlet ramp angle as an active control variable instead of being modulated passively, acceleration performance could be obviously enhanced. Acceleration objectives could be obtained with a faster acceleration time by 5%.     

Spatial working memory is enhanced for movement experts in traditional and embodied tasks

Movement experts tend to outperform non-experts on some tasks of spatial ability, suggesting that movement experts possess enhanced spatial-cognitive abilities, which may be developed over years of practice. In the current study, movement experts (dancers and athletes) and non-experts completed one verbal working memory task and two spatial working memory tasks—a traditional Corsi block-tapping task and a new full-bodied version of the Corsi task, nicknamed the “Twister Task.” Movement experts outperformed non-experts on both the Corsi and Twister tasks but not on the verbal task, suggesting that movement experience may relate to spatial working memory specifically. Additionally, the Twister task significantly correlated with the traditional Corsi task, providing validation for a new measure of spatial working memory.     

单相流体回路工质的优选研究

流体工质的选择是单相流体回路设计的一项重要内容,文章概述了流体工质的基本性能参数与选择标准,简要介绍了单相流体回路的分析计算过程,提出了能初步衡量工质优劣的一个特征性能参量热耗比F,设定3种工况条件,分别绘制了6种工质的热耗比F随温度的变化曲线,将比较结果应用于一个流体双回路系统的内回路,在SINDA/FLUINT中建立数值仿真模型,计算结果显示利用热耗比F可以对流体工质进行初步的优选。