特低燃速固体推进剂低压下的燃速测试

用“高低压声发射燃速测试系统”研究测定了特低燃速丁羟推进剂（ｒ＝２ｍｍ／ｓ～４ｍｍ／ｓ）在２ＭＰａ低压下的燃速和２ＭＰａ～１４ＭＰａ范围内的燃速压强指数。结果表明,特低燃速的测试精度可达１％,某ＨＴＰＢ－ＡＰ－Ａｌ－Ｔ２９－ＨＭＸ推进剂的燃速测试临界压强为２ＭＰａ。     

电火花加工用微型压电换能器的研制

在电火花加工中,沿电极的轴向采用微幅超声振动可明显改善微小孔的加工性能,本试验对该系统Φ２０Ｘ５５的微型换能器进行了设计和有限元分析,在频率３９～４５ｋＨｚ范围内获得无侧向振动的轴向振动和对加工有利的振幅     

Plant mineral nutrition,gas exchange and photosynthesis in space: A review

Successful growth and development of higher plants in space rely on adequate availability and uptake of water and nutrients, and efficient energy distribution through photosynthesis and gas exchange. In the present review, literature has been reviewed to assemble the relevant knowledge within space plant research for future planetary missions. Focus has been on fractional gravity, space radiation, magnetic fields and ultimately a combined effect of these factors on gas exchange, photosynthesis and transport of water and solutes.     

型号专用测试设备计量保证研究CSCD

依据相关法规规范对专用测试设备的特点开展了研究工作,总结了专用测试设备的分类要求和原则,以及对专用测试设备的全过程包括方案、研制、验收、使用阶段的计量保证要求,并对未来如何做好专用测试设备计量保证工作提出了建议。     

Object injection in geodesic conditions: In-flight and on-ground testing issues

In absence of forces, any object moves along the straightest possible path in space–time, called geodesic. The presence of a gravity field generates a space–time distortion that reflects on a curvature of the geodesics. Outer space yields a privileged environment to achieve high levels of geodesic purity, thanks to the absence of many non-gravitational force disturbances typical of the Earth, mainly due to the atmosphere, micro-seismic activity, stray electro-magnetic fields, etc. Many experiments in the field of Fundamental Physics, General Relativity and Earth Observation are performed through space missions, in which objects are either set in geodesic conditions or their deviation from a geodesic is measured. In both cases, stray non-gravitational forces acting on them must be reduced to a negligible level.     

Model-based robustness testing for avionics-embedded software

Robustness testing for safety-critical embedded software is still a challenge in its nascent stages. In this paper, we propose a practical methodology and implement an environment by employing model-based robustness testing for embedded software systems. It is a system-level black-box testing approach in which the fault behaviors of embedded software is triggered with the aid of modelbased fault injection by the support of an executable model-driven hardware-in-loop (HIL) testing environment. The prototype implementation of the robustness testing environment based on the proposed approach is experimentally discussed and illustrated by industrial case studies based on several avionics-embedded software systems. The results show that our proposed and implemented robustness testing method and environment are effective to find more bugs, and reduce burdens of testing engineers to enhance efficiency of testing tasks, especially for testing complex embedded systems.     

超声波螺栓测量仪校准方法探索

针对超声波螺栓测量仪无法校准而影响实际使用的问题,提出了一种基于比较法的校准方法,为此类仪器的有效校准做了有益的探索。     

转台用光电自准直仪测试软件开发

讨论了转台主要性能的测试方法.分析了使用光电自准直仪测试转台的软件需求.给出了光电自准直仪用于测试转台软件的开发工作流程和测试数据结果.     

力控随机振动试验的双控策略研究

力控振动试验的目的是为了解决传统振动试验中的过试验问题.除了控制加速度,力控振动试验中还同时测量和限制试件和振动台之间的作用力.确定力限条件和对力、加速度进行双重同步控制是力控振动试验中的两个关键环节.目前,简单二自由度系统方法(TDFS)、复杂二自由度系统方法(TDFS)、半经验方法(SEM)等方法已经得到研究,并用于估计力限功率谱密度(即力限条件).但是在得到力谱之后,如何根据力谱和加速度谱进行力和加速度的双重同步振动控制研究甚少.本文提出了一种可行的双控策略,可用于开发力控振动试验所需的新型振动控制器.     

摆锤式冲击响应谱试验台的仿真研究

摆锤式冲击响应谱试验台是模拟爆炸冲击环境的一种较好手段,它能够模拟拐点频率在300Hz～2000Hz,峰值过载高达几千个g值的冲击谱型。根据该装置的结构和基本原理,本文应用有限元分析软件ANSYS,LS-DYNA等对其冲击响应谱产生过程进行了模拟,计算结果与试验数据吻合较好。此方法能够合理有效地模拟该装置的性能曲线,对摆锤式冲击试验台的设计具有指导意义。