The Infrared Hyperspectral Atmospheric SounderⅡ(HIRAS-Ⅱ)is the key equipment on FengYun-3E(FY-3E)satellite,which can realize vertical atmospheric detection,featuring hyper spectral,high sensitivity and high precisio...The Infrared Hyperspectral Atmospheric SounderⅡ(HIRAS-Ⅱ)is the key equipment on FengYun-3E(FY-3E)satellite,which can realize vertical atmospheric detection,featuring hyper spectral,high sensitivity and high precision.To ensure its accuracy of detection,it is necessary to correlate their thermal models to in-orbit da⁃ta.In this work,an investigation of intelligent correlation method named Intelligent Correlation Platform for Ther⁃mal Model(ICP-TM)was established,the advanced Kriging surrogate model and efficient adaptive region opti⁃mization algorithm were introduced.After the correlation with this method for FY-3E/HIRAS-Ⅱ,the results indi⁃cate that compared with the data in orbit,the error of the thermal model has decreased from 5 K to within±1 K in cold case(10℃).Then,the correlated model is validated in hot case(20℃),and the correlated model exhibits good universality.This correlation precision is also much superiors to the general ones like 3 K in other similar lit⁃erature.Furthermore,the process is finished in 8 days using ICP-TM,the efficiency is much better than 3 months based on manual.The results show that the proposed approach significantly enhances the accuracy and efficiency of thermal model,this contributes to the precise thermal control of subsequent infrared optical payloads.展开更多
The rocket sled system is not only a high-speed dynamic ground test system,but also one of the future aerospace horizontal launch schemes.The winged load,as a common type of payload,has greater vibration and noise int...The rocket sled system is not only a high-speed dynamic ground test system,but also one of the future aerospace horizontal launch schemes.The winged load,as a common type of payload,has greater vibration and noise intensity than the wingless load.Due to the severe aerodynamic instability prior to separation,the head-up or head-down phenomena are more evident and the test accuracy significantly decreases.The high-precision computer fluid dynamics and aeroacoustic analysis are employed to explore the multifield coupling mechanism of a rocket sled with the winged payload in the wide speed range(Ma=0.5–2).The results show that as the incoming velocity increases,the cone angle of the shock wave of the rocket sled decreases,the shock pressure increases quickly,and the vortex between the slippers splits and gradually shrinks in size.The velocity of the rocket sled exerts little influence on the modal resonance frequency.The wing has a significant impact on aerodynamic noise,and as the sound pressure level rises,the propagation direction gradually shifts towards the rear and upper regions of the wing.展开更多
The quasi-zero-stiffness (QZS) vibration isolators are effective in achieving low-frequency vibration isolation for a designedpayload, but the isolation effect would be substantially reduced by payload mismatch. To ta...The quasi-zero-stiffness (QZS) vibration isolators are effective in achieving low-frequency vibration isolation for a designedpayload, but the isolation effect would be substantially reduced by payload mismatch. To tackle such a challenging problem, acompensating QZS (CQZS) vibration isolation system (VIS) is proposed to acquire QZS characteristics under arbitrarypayloads. The dynamic characteristics of the CQZS VIS are analyzed to estimate the performance decline of vibration isolationunder payload mismatch. Moreover, the compensation principle of the CQZS VIS is demonstrated, and then the CQZS VIS isfabricated by combining a passive QZS isolator and a compensation system. Finally, experiments are conducted to evaluate thecompensation capability and vibration isolation performance enhance of the CQZS VIS. It is found that the CQZS VIS is ableto compensate payload mismatch, and thus the QZS characteristic can be regained when the payload deviates from thedesigned one, which enabls the QZS VIS to achieve significant low-frequency vibration isolation under payload mismatch.展开更多
The electro-optical payloads on mobile platforms generally suffer undesirable vibrations generated by maneuvers and turbulence.These vibrations are in six degrees of freedom and cause line-of-sight jitters,resulting i...The electro-optical payloads on mobile platforms generally suffer undesirable vibrations generated by maneuvers and turbulence.These vibrations are in six degrees of freedom and cause line-of-sight jitters,resulting in image blurring and loss of tracking accuracy.In this paper,a Hexapod Vibration Isolation System(HVIS)is proposed and optimized to solve this problem.The optimization aims to centralize and minimize the natural frequencies of HVIS,for expanding the vibration isolation bandwidth and improving the vibration isolation in the higher frequency band.Considering that the design space for HVIS is limited and interfered with the frames of the mobile platform,a non-collision algorithm is proposed and applied in the optimization to obtain the feasible optimal design.The optimization result shows that the natural frequency bandwidth has been reduced by 42.9%,and the maximum natural frequency is reduced by 30.2%.The prototypes of initial and optimal designs are manufactured and tested.Both simulated and experimental results demonstrate the validity of the optimization,and the optimal design provides a maximum of 15 dB more isolation in rotation direction than the initial design.展开更多
Large unmanned underwater vehicles can carry big payloads for varied missions and it is desirable for them to possess an upright orientation during payload release.Their attitude can hardly be maintained during and af...Large unmanned underwater vehicles can carry big payloads for varied missions and it is desirable for them to possess an upright orientation during payload release.Their attitude can hardly be maintained during and after the phase of payload release.Releasing a payload from the vehicle induces uncertainties not only in rigid-body parameters,e.g,the moment of inertia tensor due to the varying distribution of the masses on board the vehicle,but also in the hydrodynamic derivatives due to the vehicle’s varying geometric profile.A nonlinear attitude stabilizer that is robust to these time-varying model uncertainties is proposed in this paper.Stability is guaranteed via Lyapunov stability theory.The simulation results verify the effectiveness of the proposed approach.展开更多
Earth’s near space,located in the region between 20 and 100 km above sea level,is characterized by extreme conditions,such as low temperature,low atmospheric pressure,harsh radiation,and extreme dryness.These conditi...Earth’s near space,located in the region between 20 and 100 km above sea level,is characterized by extreme conditions,such as low temperature,low atmospheric pressure,harsh radiation,and extreme dryness.These conditions are analogous to those found on the surface of Mars and in the atmosphere of Venus,making Earth’s near space a unique natural laboratory for astrobiological research.To address essential astrobiological questions,teams from the Chinese Academy of Sciences(CAS)have developed a scientific balloon platform,the CAS Balloon-Borne Astrobiology Platform(CAS-BAP),to study the effects of near space environmental conditions on the biology and survival strategies of representative organisms in this terrestrial analog.Here,we describe the versatile Biological Samples Exposure Payload(BIOSEP)loaded on the CAS-BAP with respect to its structure and function.The primary function of BIOSEP is to expose appropriate biological specimens to the harsh conditions of near space and subsequently return the exposed samples to laboratories for further analysis.Four successful flight missions in near space from 2019 to 2021 have demonstrated the high reliability and efficiency of the payload in communicating between hardware and software units,recording environmental data,exposing sample containers,protecting samples from external contamination,and recovering samples.Understanding the effects of Earth’s near space conditions on biological specimens will provide valuable insights into the survival strategies of organisms in extreme environments and the search for life beyond Earth.The development of BIOSEP and associated biological exposure experiments will enhance our understanding of the potential for life on Mars and the habitability of the atmospheric regions of other planets in the solar system and beyond.展开更多
为了更好探测识别与跟踪空飘球,考虑到空飘球运动与环境风的高度相关性,综合应用雷达探测定位、风场反演技术提出一种预测空飘球轨迹并判断其载荷的方法。基于当下主流的速度平面处理方法提出双体积单元风场反演方案。方案中,通过建立...为了更好探测识别与跟踪空飘球,考虑到空飘球运动与环境风的高度相关性,综合应用雷达探测定位、风场反演技术提出一种预测空飘球轨迹并判断其载荷的方法。基于当下主流的速度平面处理方法提出双体积单元风场反演方案。方案中,通过建立空飘球流体力学分析下的动力学模型实现空飘球在空轨迹的预测;引入轨迹惯性度(degree of inertia,DOI)和质阻比计算空飘球空载状态下理论轨迹与实际轨迹的差异,分析其自身空飘属性与携带载荷状况。通过仿真实验验证所提方法,结果表明所提风场反演方法各方向风场反演平均绝对误差在0.1以下,轨迹预测误差小于0.162,且在随机观测误差下展现了较好的鲁棒性;通过DOI值能有效判断空飘球带载有无的情况且判断结果受风场观测误差影响较小,相较于空载状态,载荷质量增加1%时DOI值增加16倍,并能较好表现空飘球与载荷之间的质量分布关系,且当载荷质量占比7%以上时DOI判据更为有效;同时通过DOI值能用于判断空飘球是否具备自主动力,根据仿真结果可以认为DOI值大于202,表明空飘球可能具备自主动力。展开更多
【背景】可控热核聚变研究具有巨大政治、经济、社会意义;中国和全球主要国家在这个领域开展了全面、深入的合作,其中基于网络的科研协同成为了必然选择。【目的】针对热核聚变国际科研协同中不同应用的特点,提升长延时高带宽国际链路...【背景】可控热核聚变研究具有巨大政治、经济、社会意义;中国和全球主要国家在这个领域开展了全面、深入的合作,其中基于网络的科研协同成为了必然选择。【目的】针对热核聚变国际科研协同中不同应用的特点,提升长延时高带宽国际链路的传输性能,确保设计协同和在线实验的顺利开展。【方法】依托中国科技网,研究和应用多种网络数据传输加速手段,分别提升端到端应用、专用高性能传输节点间(DTNs Data Transfer Nodes)的网络传输性能。【结果】测试以及实践结果表明,本文的方法有效地支撑了热核聚变国际科研设计协同和在线实验的网络需求。展开更多
针对恶劣海况下吊装细长杆件产生的双摆现象而带来的作业效率低、风险高以及难以精确定位等问题,提出了一种新型多柔索减摇定姿系统(multi-tagline anti-swing and positioning system,MTAPS),采用多体动力学和牛顿经典力学方法建立MTAP...针对恶劣海况下吊装细长杆件产生的双摆现象而带来的作业效率低、风险高以及难以精确定位等问题,提出了一种新型多柔索减摇定姿系统(multi-tagline anti-swing and positioning system,MTAPS),采用多体动力学和牛顿经典力学方法建立MTAPS的动力学模型。试验数据表明,MTAPS可以有效抑制规则吊重和细长杆件吊重的摆动,在短时间内可使细长杆件吊重趋于相对稳定状态,在设定工况下MTAPS对规则吊重和细长杆件的平均减摇比分别在90%和85%以上。通过动力学仿真分析比较了船舶运动激励下多柔索减摇系统和MTAPS的减摇效果以及动力学特性。基于多柔索减摇系统研制的起重机防摆装置已完成实船应用,为实现海上细长杆件的快速转运和精确定位提供了一种新思路。展开更多
基金Supported by the National Key Research and Development Program of China(2022YFB3904803)。
文摘The Infrared Hyperspectral Atmospheric SounderⅡ(HIRAS-Ⅱ)is the key equipment on FengYun-3E(FY-3E)satellite,which can realize vertical atmospheric detection,featuring hyper spectral,high sensitivity and high precision.To ensure its accuracy of detection,it is necessary to correlate their thermal models to in-orbit da⁃ta.In this work,an investigation of intelligent correlation method named Intelligent Correlation Platform for Ther⁃mal Model(ICP-TM)was established,the advanced Kriging surrogate model and efficient adaptive region opti⁃mization algorithm were introduced.After the correlation with this method for FY-3E/HIRAS-Ⅱ,the results indi⁃cate that compared with the data in orbit,the error of the thermal model has decreased from 5 K to within±1 K in cold case(10℃).Then,the correlated model is validated in hot case(20℃),and the correlated model exhibits good universality.This correlation precision is also much superiors to the general ones like 3 K in other similar lit⁃erature.Furthermore,the process is finished in 8 days using ICP-TM,the efficiency is much better than 3 months based on manual.The results show that the proposed approach significantly enhances the accuracy and efficiency of thermal model,this contributes to the precise thermal control of subsequent infrared optical payloads.
基金supported by the National Natural Science Foundation of China(No.12104047)。
文摘The rocket sled system is not only a high-speed dynamic ground test system,but also one of the future aerospace horizontal launch schemes.The winged load,as a common type of payload,has greater vibration and noise intensity than the wingless load.Due to the severe aerodynamic instability prior to separation,the head-up or head-down phenomena are more evident and the test accuracy significantly decreases.The high-precision computer fluid dynamics and aeroacoustic analysis are employed to explore the multifield coupling mechanism of a rocket sled with the winged payload in the wide speed range(Ma=0.5–2).The results show that as the incoming velocity increases,the cone angle of the shock wave of the rocket sled decreases,the shock pressure increases quickly,and the vortex between the slippers splits and gradually shrinks in size.The velocity of the rocket sled exerts little influence on the modal resonance frequency.The wing has a significant impact on aerodynamic noise,and as the sound pressure level rises,the propagation direction gradually shifts towards the rear and upper regions of the wing.
基金supported by the National Natural Science Foundation of China(Grant Nos.12302003,12272129,and 12122206)Hong Kong Scholars Program(Grant No.XJ2022012).
文摘The quasi-zero-stiffness (QZS) vibration isolators are effective in achieving low-frequency vibration isolation for a designedpayload, but the isolation effect would be substantially reduced by payload mismatch. To tackle such a challenging problem, acompensating QZS (CQZS) vibration isolation system (VIS) is proposed to acquire QZS characteristics under arbitrarypayloads. The dynamic characteristics of the CQZS VIS are analyzed to estimate the performance decline of vibration isolationunder payload mismatch. Moreover, the compensation principle of the CQZS VIS is demonstrated, and then the CQZS VIS isfabricated by combining a passive QZS isolator and a compensation system. Finally, experiments are conducted to evaluate thecompensation capability and vibration isolation performance enhance of the CQZS VIS. It is found that the CQZS VIS is ableto compensate payload mismatch, and thus the QZS characteristic can be regained when the payload deviates from thedesigned one, which enabls the QZS VIS to achieve significant low-frequency vibration isolation under payload mismatch.
基金supported by the National Key R&D Program of China(No.2021YFA1003503)。
文摘The electro-optical payloads on mobile platforms generally suffer undesirable vibrations generated by maneuvers and turbulence.These vibrations are in six degrees of freedom and cause line-of-sight jitters,resulting in image blurring and loss of tracking accuracy.In this paper,a Hexapod Vibration Isolation System(HVIS)is proposed and optimized to solve this problem.The optimization aims to centralize and minimize the natural frequencies of HVIS,for expanding the vibration isolation bandwidth and improving the vibration isolation in the higher frequency band.Considering that the design space for HVIS is limited and interfered with the frames of the mobile platform,a non-collision algorithm is proposed and applied in the optimization to obtain the feasible optimal design.The optimization result shows that the natural frequency bandwidth has been reduced by 42.9%,and the maximum natural frequency is reduced by 30.2%.The prototypes of initial and optimal designs are manufactured and tested.Both simulated and experimental results demonstrate the validity of the optimization,and the optimal design provides a maximum of 15 dB more isolation in rotation direction than the initial design.
文摘Large unmanned underwater vehicles can carry big payloads for varied missions and it is desirable for them to possess an upright orientation during payload release.Their attitude can hardly be maintained during and after the phase of payload release.Releasing a payload from the vehicle induces uncertainties not only in rigid-body parameters,e.g,the moment of inertia tensor due to the varying distribution of the masses on board the vehicle,but also in the hydrodynamic derivatives due to the vehicle’s varying geometric profile.A nonlinear attitude stabilizer that is robust to these time-varying model uncertainties is proposed in this paper.Stability is guaranteed via Lyapunov stability theory.The simulation results verify the effectiveness of the proposed approach.
基金supported by the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDA17010505)
文摘Earth’s near space,located in the region between 20 and 100 km above sea level,is characterized by extreme conditions,such as low temperature,low atmospheric pressure,harsh radiation,and extreme dryness.These conditions are analogous to those found on the surface of Mars and in the atmosphere of Venus,making Earth’s near space a unique natural laboratory for astrobiological research.To address essential astrobiological questions,teams from the Chinese Academy of Sciences(CAS)have developed a scientific balloon platform,the CAS Balloon-Borne Astrobiology Platform(CAS-BAP),to study the effects of near space environmental conditions on the biology and survival strategies of representative organisms in this terrestrial analog.Here,we describe the versatile Biological Samples Exposure Payload(BIOSEP)loaded on the CAS-BAP with respect to its structure and function.The primary function of BIOSEP is to expose appropriate biological specimens to the harsh conditions of near space and subsequently return the exposed samples to laboratories for further analysis.Four successful flight missions in near space from 2019 to 2021 have demonstrated the high reliability and efficiency of the payload in communicating between hardware and software units,recording environmental data,exposing sample containers,protecting samples from external contamination,and recovering samples.Understanding the effects of Earth’s near space conditions on biological specimens will provide valuable insights into the survival strategies of organisms in extreme environments and the search for life beyond Earth.The development of BIOSEP and associated biological exposure experiments will enhance our understanding of the potential for life on Mars and the habitability of the atmospheric regions of other planets in the solar system and beyond.
文摘为了更好探测识别与跟踪空飘球,考虑到空飘球运动与环境风的高度相关性,综合应用雷达探测定位、风场反演技术提出一种预测空飘球轨迹并判断其载荷的方法。基于当下主流的速度平面处理方法提出双体积单元风场反演方案。方案中,通过建立空飘球流体力学分析下的动力学模型实现空飘球在空轨迹的预测;引入轨迹惯性度(degree of inertia,DOI)和质阻比计算空飘球空载状态下理论轨迹与实际轨迹的差异,分析其自身空飘属性与携带载荷状况。通过仿真实验验证所提方法,结果表明所提风场反演方法各方向风场反演平均绝对误差在0.1以下,轨迹预测误差小于0.162,且在随机观测误差下展现了较好的鲁棒性;通过DOI值能有效判断空飘球带载有无的情况且判断结果受风场观测误差影响较小,相较于空载状态,载荷质量增加1%时DOI值增加16倍,并能较好表现空飘球与载荷之间的质量分布关系,且当载荷质量占比7%以上时DOI判据更为有效;同时通过DOI值能用于判断空飘球是否具备自主动力,根据仿真结果可以认为DOI值大于202,表明空飘球可能具备自主动力。
文摘【背景】可控热核聚变研究具有巨大政治、经济、社会意义;中国和全球主要国家在这个领域开展了全面、深入的合作,其中基于网络的科研协同成为了必然选择。【目的】针对热核聚变国际科研协同中不同应用的特点,提升长延时高带宽国际链路的传输性能,确保设计协同和在线实验的顺利开展。【方法】依托中国科技网,研究和应用多种网络数据传输加速手段,分别提升端到端应用、专用高性能传输节点间(DTNs Data Transfer Nodes)的网络传输性能。【结果】测试以及实践结果表明,本文的方法有效地支撑了热核聚变国际科研设计协同和在线实验的网络需求。
文摘针对恶劣海况下吊装细长杆件产生的双摆现象而带来的作业效率低、风险高以及难以精确定位等问题,提出了一种新型多柔索减摇定姿系统(multi-tagline anti-swing and positioning system,MTAPS),采用多体动力学和牛顿经典力学方法建立MTAPS的动力学模型。试验数据表明,MTAPS可以有效抑制规则吊重和细长杆件吊重的摆动,在短时间内可使细长杆件吊重趋于相对稳定状态,在设定工况下MTAPS对规则吊重和细长杆件的平均减摇比分别在90%和85%以上。通过动力学仿真分析比较了船舶运动激励下多柔索减摇系统和MTAPS的减摇效果以及动力学特性。基于多柔索减摇系统研制的起重机防摆装置已完成实船应用,为实现海上细长杆件的快速转运和精确定位提供了一种新思路。
