基于NX运动控制器的三维太空环监控系统设计

三维太空环能够模拟人在太空中的感知和体验。设计基于NX运动控制器的三维太空环监控系统,包括运动控制系统和上位机监视系统两部分。运动控制系统与伺服驱动器和触摸屏一起控制滚环的旋转速度和运行时间,上位机监视系统应用C#和SQL Server数据库开发,负责设备运行数据的采集、存储和管理。该监控系统速度控制精度高,末态定位准确,操作简单,具有异常报警等功能,且运行安全可靠。

三维太空环结构工艺性的改进

三维太空环是特种游乐设备,针对其关键部位存在的质量问题进行工艺改进。改进后在满负荷下进行试验,其技术指标达到设计规定的技术要求,证明该改进是合理的,方案是可行的。

科学家大胆设想 给地球套个太空环防止变暖

科学家们提出了一个大胆的想法，要围绕地球建立一个由小微粒或太空飞船组成的人工太空环，遮蔽热带阳光，调节地球温度。

Real-time horizontality adjusting and control system of a large platform applied to satellite experiment

In order to satisfy a satellite horizontality requirement in an experiment, it is indispensable to monitor and adjust the horizontality of a large platform loading the satellite under the condition of ultra-low temperature with real time. So the control system design and control strategy are described in detail to accomplish the horizontality monitoring and adjusting. The system adopts the industry control computer as the upper computer and the SIEMENS S7-300 PLC as the lower computer. The upper computer that bases on industry configuration software IFIX takes charge of monitoring the platform and puts forward the control strategy. PLC takes charge of receiving the adjusting instructions and controlling the legs moving to accomplish the horizontality adjusting. The horizontality adjusting strategy is emphasized and the concept of grads is introduced to establish a mathematics model of the platform inclined state, so the adjusting method is obtained. Accordingly the key question of the automatic horizontality adjusting is solved in this control system.

Images of the Future from the Past： The Metabolists and the Utopian Planning of the 1960s

During the 1960s, many changes reshaped the economy, the society and the arts. The Cold War, the Space Race, the construction of a new middle class in most western societies led by the postwar economic prosperity with unprecedented urban growth followed by severe environmental problems fostered the design of spectacular urban utopian cities and mega-architectures. In those years, Japan was the source of highly influential bold and visionary urban and architectural ideas which relied on advanced technology. These ideas were conceived on the thought that cities could be seen as gigantic but impermanent entities able to transform itself according to an organic process of adaptation of its elementary components. This paper briefly revisits and critically discusses the legacy of the iconic mega-strnctural projects of Japanese Metabolist Movement and other visionary architects and planners of the 1960s, such as Paolo Soleri, Buckminster Fuller, Archigram. It attempts to enlighten the continuity with contemporary innovative and experimental urban models and ideas for the society and the city of the future, such as the Smart Cities, Eco-Cities, Green Urbanism, whose design is led by concerns related to climate change, the necessity of energy efficiency, the improvement of urban landscape and the valorization of depleted natural resources.

Openwork Walls and Their Solar Applicability Range Jorge Hernan Salazar Trujillo

The environmental potential of perforated surfaces in the tropics is noticeable. They allow obtaining higher attenuation and spatial dispersion of both direct and diffuse lighting in indoor spaces, whereas in outdoor areas, the openwork elements reduce surfaces temperature and mitigate the characteristic glare of smooth surfaces when exposed to sunlight. Openwork walls have an immense sustainability potential in modern tropical buildings： they limit the solar rays＇ admission, as well as provide an advantageous use of natural light and cross ventilation, but the research on their solar behavior is scarce. In order to obtain suitable levels of solar gain, relationships among shape, proportion, thickness and partitions composing openwork elements must be studied. This research evaluates solar gain in perforated surfaces by defining the ＂solar applicability range＂, a property useful to identify intervals of guidance where a perforated pattern shape will present a definite solar gain, giving valuable input in the geometric design of openwork elements and introducing shade performance in the design of openwork walls. Results give geometric guidelines that allow to widen the solar applicability range of a perforation pattern and to define two perforation features that have impact on the solar performance of perforated surfaces： focalization and solar performance shift.

Low-temperature thermoplastic welding of metallic glass ribbons for in-space manufacturing

In-space manufacturing is an emerging and promising research field in space industry,which benefits the development of space explorations.Owing to the microgravity,high vacuum and complexity of the space environment,a special manufacturing strategy for alloys is highly demanded for the in-space manufacturing.Herein,a lowtemperature thermoplastic metallic welding method was proposed and employed for La-based metallic glass ribbons.With the sandwiched structures of La-and Zr-based ribbons,the welded samples exhibit a competitive fracture strength and an increased tensile strain than those of the welded la-based samples due to the second phase strengthening.This suggests that metallic glass is an ideal material candidate for in-space manufacturing,and can be well manufactured at a nonmelting state with good mechanical performances.In addition,the thermoplastic manufacturing method can also feature a moderate processing time window.In general,this work presents the promising potential of low-temperature thermoplastic welding strategy for in-space manufacturing of metallic materials.

Numerical study on the response of the Earth's magnetosphere-ionosphere system to a super solar storm

With the approaching of the 24th solar cycle peak year （2012-2014）, the impacts of super solar storms on the geospace envi- ronment have drawn attentions. Based on the geomagnetic field observations during Carrington event in 1859, we estimate the interplanetary solar wind conditions at that time, and investigate the response of the magnetosphere-ionosphere system to this extreme solar wind conditions using global 3D MHD simulations. The main findings include： l） The day-side magnetopause and bow shock are compressed to 4.3 and 6.0 Re （Earth radius）, and their flanks are also strongly compressed. The magneto- pause shifts inside the geosynchronous orbit, exposing geosynchronous satellites in the solar wind in the magnetosheath. 2） During the storm, the region-1 current increases by about 60 times, and the cross polar potential drop increases by about 80 times; the reconnection voltage is about 5 to 6 times larger than the average storms, which means a larger amount of the solar wind energy enters the magnetosphere, resulting in strong space weather phenomena.

Effects of the thermal environment on the thermal control system of AMS

This paper presents an overview of the AMS thermal control system and its thermal environment on the ISS.We give examples of analysis and correlation of space environmental impacting on the thermal control system of AMS.The most critical factors that affect the thermal environment to AMS are beta angle,attitude of ISS,ISS solar array and ISS radiator positions.The design of a special sandwich structure with embedded heat pipes provides the radiator with higher heat transfer ability for electronics and power crates,and it provides a large heat retaining capacity to balance the frequent changes of the space environment temperatures as well.In cold cases,the thermostatically controlled heaters are working actively to protect AMS.However,sometimes,because of ISS special operations plus extreme beta angle condition,AMS needs to request NASA to adjust the ISS configuration for thermal control.The AMS thermal control system is reliable and stable,which has been verified by its operation on the ISS for more than three years.All the detectors operate normally,the electronics and crates work within their specific temperature limits.