航天服

As the pressure inside the spacesuit than normally low, there may human tissue inside the release of nitrogen in the formation of air embolism within blood vessels, leading to decompression sickness, and even endanger human life.

由于航天服内的压力比正常情况下低，有可能会使人体组织内的氮气释放，在血管内形成气栓，导致减压病，甚至危及人的生命。

When the spaceflight which carry human befell to leakiness.

新的宇航服主要由服装、头盔、手套和航天靴等组成。

Th e motion performance of two areospace pressure suit were studied. Human mechani cs and its physiological basis was applied in the design of one suit only.

方法对比在两种航空航天压力服设计中，采用或不运用人体力学与其生理基础进行设计的活动效能。

The odor is similar to the smell of burnt gunpowder, and is not noticeable inside a spacesuit.

气味类似火药烧焦的气味，并没有明显的航天服内。

The holistic design of the system and resolved the designs of software and hardware based on VXI bus are put forward according to the demand of test system. The hardware and software is designed, including the formation and design of hardware system, visual instrument software architecture, program design for instrument driver, high speed real-time data collection. In the dynamic test program, the idea of"software is instrument"was applied to meet the diverse test demands. Last, it is proposed that the VXI test system be developed to more totalization and networked. The basic theory of system identification was introduced briefly at first. The principle of spectrum analysis system identification based on Wiener-Hopf equation was expatiated. and the questions in applying Peusdo Random signal as spectrum analysis methods stimulate signal was studied, The generation principle of the peusdo random signal is researched, the characteristic of peusdo random are analyzed from time domain and frequency domain, the inverse repeat peusdo random signal is brought forward to make up the shortage of ordinary peusdo random signal. And a new chaos genetic algorithmis presented to solve the unprecise problem of the traditional method. In the servo valve dynamic characteristic test system, the spectrum analysis methods was applied successfully, the servo valve dynamic characteristic could be acquired rapidly and exactly, the test results were analyzed and the ameliorate methods were brought forward at last.

结合航天某集团液压测试中心测试系统的需求，提出了基于VXI总线的液压测试系统的整体设计方案，完成了测试系统的硬件设计与软件设计，包括硬件系统构成与设计、虚拟仪器软件结构、仪器驱动程序设计、高速同步实时数据采集等内容；以伺服阀动态特性测试为例设计了测试模块，该模块体现了VXI总线仪器软件开发所倡导的"虚拟仪器"的思想，以软件的灵活应用满足了不同的测试需求；结合自动测试系统的发展，研究了VXI测试系统与网络技术结合，实现各种软硬件资源共享，进一步提高设备及数据的利用率和系统的扩展性，使自动测试向综合化、网络化方向发展；研究了伪随机信号作为谱分析法辨识的激励信号时存在的问题，讨论了伪随机信号的产生机理，从频域和时域分析了伪随机信号的性质及其应用，提出了用逆重复伪随机信号弥补了普通伪随机信号的不足，并以混沌遗传算法对逆重复伪随机信号产生过程中的参数进行优化，可以更合理而不是凭经验产生需要的逆重复伪随机信号。

Objective To develop a portable ventilation device to cool and dehumidify for the astronauts who work or move dressed in spacesuit in the atmospheric environment on the ground.

在地面大气环境下，对穿着航天服作业和移动的航天员进行便携式通风，以达到降温和除湿的目的。

Based on electro-hydraulic servo control technology and computer control technology, this thesis studies the digital self-adaptative control dynamic electro-hydraulic fatigue testing machine, which is widely applied in several fields, such as aerospace, national defense and military industry, railways equipment, machinofacture, vehicle and ship industry, metallurgy, mine engineering, architectural material, petrochemical industry, plastic and rubber industry, wire and cable industry, etc.

本文以广泛应用于航空航天、国防军工、铁路装备、机械制造、车辆船舶、冶金矿山、建筑建材、石油化工、塑料橡胶、电线电缆等多个领域的电液疲劳试验机为研究对象，以电液伺服控制技术和计算机控制技术为基础，旨在研究高响应、高静态精度、高动态精度、数字化、载荷自适应的疲劳试验机。

The holistic design of the system and resolved the designs of software and hardware based on VXI bus are put forward according to the demand of test system. The hardware and software is designed, including the formation and design of hardware system, visual instrument software architecture, program design for instrument driver, high speed real-time data collection. In the dynamic test program, the idea of"software is instrument"was applied to meet the diverse test demands. Last, it is proposed that the VXI test system be developed to more totalization and networked. The basic theory of system identification was introduced briefly at first. The principle of spectrum analysis system identification based on Wiener-Hopf equation was expatiated. and the questions in applying Peusdo Random signal as spectrum analysis methods stimulate signal was studied, The generation principle of the peusdo random signal is researched, the characteristic of peusdo random are analyzed from time domain and frequency domain, the inverse repeat peusdo random signal is brought forward to make up the shortage of ordinary peusdo random signal. And a new chaos genetic algorithmis presented to solve the unprecise problem of the traditional method. In the servo valve dynamic characteristic test system, the spectrum analysis methods was applied successfully, the servo valve dynamic characteristic could be acquired rapidly and exactly, the test results were analyzed and the ameliorate methods were brought forward at last.

结合航天某集团液压测试中心测试系统的需求，提出了基于VXI总线的液压测试系统的整体设计方案，完成了测试系统的硬件设计与软件设计，包括硬件系统构成与设计、虚拟仪器软件结构、仪器驱动程序设计、高速同步实时数据采集等内容；以伺服阀动态特性测试为例设计了测试模块，该模块体现了VXI总线仪器软件开发所倡导的&虚拟仪器&的思想，以软件的灵活应用满足了不同的测试需求；结合自动测试系统的发展，研究了VXI测试系统与网络技术结合，实现各种软硬件资源共享，进一步提高设备及数据的利用率和系统的扩展性，使自动测试向综合化、网络化方向发展；研究了伪随机信号作为谱分析法辨识的激励信号时存在的问题，讨论了伪随机信号的产生机理，从频域和时域分析了伪随机信号的性质及其应用，提出了用逆重复伪随机信号弥补了普通伪随机信号的不足，并以混沌遗传算法对逆重复伪随机信号产生过程中的参数进行优化，可以更合理而不是凭经验产生需要的逆重复伪随机信号。

In this paper,the position accuracy improving method of the opening CNC system based on PMAC is analyzed,the servo-control algorithm which involves PID,velocity/acceleration feed forward control and notch filter and the error compensation function provided by PMAC is discussed,the pitch error compensation and the clearance error compens.

文章分析了在基于 PMAC 的开放式数控系统中提高定位精度的具体方法，对 PMAC 所提供的&PID+速度/加速度前馈+陷波滤波器&的伺服控制算法和误差补偿功能进行了阐述，将螺距误差补偿和间隙误差补偿应用于航空航天领域某型测控系统的系统误差补偿中，取得了良好效果。

With the development of navigation and astronavigation industry, the large batch production of servovalves is bringing forward, and spool valve overlap measuring precision and efficiency has became the key point in servovalve machining process, the reaserch on the measuring technology for overlap value of spool valve has an important significance for increasing national defense strength and application foreground.

随着航空航天事业的不断发展，对伺服阀也提出了批生产的要求，滑阀叠合量的测量精度和效率更成为伺服阀制造中的技术关键，因此研究滑阀叠合量测量技术对提高伺服阀的制造工艺水平，进而提升军工生产能力有着重要意义和应用前景。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。