基于西门子611D的力矩电机控制技术

简要介绍了力矩电机在航空制造设备的应用及控制技术要求。着重介绍了基于西门子611D全数字伺服控制下,力矩电机驱动参数的配置及速度环、位置环的优化,为力矩电机的控制技术应用提供了实践基础。     

一种适合P2PMMOG的安全同步算法

为了保证游戏通信协议具有较好的状态同步和防欺骗能力,提出一种适合P2P MMOG的安全同步算法.该算法在防欺骗协议NEO中加入事件排序和基于事件关联的回滚机制,在保证更新信息安全交换的基础上,对游戏事件进行排序,并对迟到事件进行处理.实验结果表明,该算法保证了较好的回滚次数和响应时间,可以有效维护游戏状态的一致性.在防欺骗和游戏状态同步的基础上维护了游戏的公平性.     

垂直发射微小型地-空导弹可拦截区的计算

建立了导弹及目标的飞行数学模型,给出了地-空导弹可拦截区的计算方法,对导弹及目标的对抗飞行运动进行了仿真。对仿真结果进行综合分析后认为,导弹可拦截区主要由以下因素决定：导弹发动机与机动能力、导弹-目标相对位置与目标的初始速度矢量、目标的机动飞行能力等。所给出的导弹可拦截区算法可以计算出任意情况下的可拦截区。     

Precise modeling of arc tooth face-gear with transition curve

A fabrication method is adopted for which an imaginary gear simultaneously realizes conjugated meshing with an arc tooth cylindrical gear and an arc tooth face-gear. The cutter fillet and tooth crest edge form the tooth root fillet of the gear, and the linear tooth surface equation of the imaginary gear and the position vector of the curvature center of the cutter fillet arc constructed with certain cutter inclination to deduce a working arc tooth surface equation. The tooth root fillet equation of the arc tooth face-gear is derived from the meshing geometry and kinematics. A numer- ically controlled machining model of the arc tooth face-gear is established through the transforma- tion of adjustment parameters from the cutter-tilt milling machine to a common multi-axis NC machine. Motion parameters of each movement axis of the NC machine are acquired. A processing example is presented to verify the precision of the fabrication method in processing the arc tooth face-gear. The method provides a theoretical and tentative basis for the analysis of tooth surface contact stress, tooth root bending stress and dynamics. A hobbing test is conducted to demonstrate the good meshing condition of the arc tooth face-gear pair.     

夸克磁共振及磁共振治癌

主要提出了以下学术观点：①粒子世界中并不存在强相互作用，夸克休系是自由旋着的夸克在电磁－弱相互作用下产生的进动维系稳定的；②物质的质量源于夸克的质量，夸克的质量又源于它的自旋。自旋转速不同，能量不同，质量就不同；③用高能粒子碰撞分离出自由夸克很难，但用夸克磁共振（ＱＭＲ）分离出自由夸克却很容易；④利用纵向驰豫时间的差别，使ＱＭＲ仅在肿瘤组织内分离出自由夸克，就可在治癌的同时，不伤及正常组织，从而为     

空间环境对聚合物基复合材料性能的影响分析

文章介绍了空间飞行器工作过程中的空间环境条件。为满足这些要求 ,在设计与选材时须考虑一些因素。此外对某型号任务中使用的P75S/环氧 6 48复合材料耐空间环境条件的性能做了简要评述     

The HAL-3 radar test set

This paper presents the HAL-3 radar test set (called the set in the following) used to measure the technical specifications of the HAL-3 airborne radar and to maintain it based on tested results. Some new techniques are employed in the set, including sinusoidal pulsewidth modulation (SPWM) in the power supply, digital gyro simulator and automatic test module (ATM) with STD industrial control microprocessor series. The specially designed software implements man-machine interaction with menu in Chinese, selects parameters and operation mode, and controls testing procedures. These techniques may be extensively applied to other automatic test instruments     

一种期刊管理自动化系统（PMAS）的模式

论述了期刊管理自动化的重要性，讨论了对期刊实行自动化管理的具体内容，其中包括期刊管理，期刊服务。文中还提出了组成这一自动化系统的模块化结构，最后探讨了采用微机网络实现其自动化的可能性。     

宁强碳质球粒陨石基质及暗色边化学成份研究

采用仪器中子活化方法分析了宁强碳质球粒陨石基质及暗色边化学成份。结果表明,宁强陨石的基质比全岩富集轻稀土和亲硫元素,并大致具有与Allende陨石基质相似的稀土特征。暗色边与陨石基质的差别在于:前者富FeO而贫难熔元素。推测陨石基质与暗色边物质来源于太阳星云不同区域。与形成暗色边有关的突发性事件可能曾多次在太阳星云的不同区域中发生。     

CFD predictions of LBO limits for aero-engine combustors using fuel iterative approximation

Lean blow-out (LBO) is critical to operational performance of combustion systems in propulsion and power generation. Current predictive tools for LBO limits are based on decadesold empirical correlations that have limited applicability for modern combustor designs. According to the Lefebvre’s model for LBO and classical perfect stirred reactor (PSR) concept, a load parameter (LP) is proposed for LBO analysis of aero-engine combustors in this paper. The parameters contained in load parameter are all estimated from the non-reacting flow field of a combustor that is obtained by numerical simulation. Additionally, based on the load parameter, a method of fuel iterative approximation (FIA) is proposed to predict the LBO limit of the combustor. Compared with experimental data for 19 combustors, it is found that load parameter can represent the actual combustion load of the combustor near LBO and have good relativity with LBO fuel/air ratio (FAR). The LBO FAR obtained by FIA shows good agreement with experimental data, the maximum prediction uncertainty of FIA is about ±17.5%. Because only the non-reacting flow is simulated, the time cost of the LBO limit prediction using FIA is relatively low (about 6 h for one combustor with computer equipment of CPU 2.66 GHz · 4 and 4 GB memory), showing that FIA is reliable and efficient to be used for practical applications.