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Landing control method of a lightweight four-legged landing and walking robot

Frontiers of Mechanical Engineering 2022, Volume 17, Issue 4, doi: 10.1007/s11465-022-0707-1

Abstract: A lightweight four-legged landing and walking robot called “FLLWR” is designed in this study.A landing control method via compliance control is proposed to solve the critical problem of impact energydissipation to realize buffer landing.Repetitive landing experiments on a five-degree-of-freedom lunar gravity testing platform are performedUnder the landing conditions with a vertical velocity of 2.1 m/s and a loading weight of 140 kg, the

Keywords： landing and walking robot     lunar exploration     buffer landing     compliance control    

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Opinion on Space Launch and Manned Lunar-landing

Zhang Zeming ,Jiang Yi ,Fu Debin

Strategic Study of CAE 2006, Volume 8, Issue 10,   Pages 37-41

Abstract:

The lunar-landing is the continuation of manned spaceflight engineering.

Keywords： lunar-landing     space launch     launch platform     lunar-landing orbit     technical route    

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Estimation of fatigue damage of airplane landing gear

LIU Ke-ge, YAN Chu-liang, ZHANG Shu-ming

Frontiers of Mechanical Engineering 2006, Volume 1, Issue 4,   Pages 424-428 doi: 10.1007/s11465-006-0051-x

Abstract: Taking the main landing gears of fighter and transport airplanes as examples, the fatigue life was estimatedThe computed results show that the landing damage to the fighter and transport airplanes is 75% and 60%of the total damage, and the damage caused by the landing stroke is 40% of the landing-gear damage.
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Planar jumping with stable landing through foot orientation design and ankle joint control

Qilong YUAN, I-Ming CHEN

Frontiers of Mechanical Engineering 2012, Volume 7, Issue 2,   Pages 100-108 doi: 10.1007/s11465-012-0318-3

Abstract: In this work, through determining the upper body posture trajectory in the flight phase, the foot landingposture is made to be flat while landing.Together with properly designing the trajectory for local center of gravity and the foot landing velocity, the soft landing trajectory is generated.Jumping motion with stable landing is achieved in a dynamic simulation environment based on this method

Keywords： biped jumping     stable landing control     jumping motion generation    

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Modeling and analysis of landing collision dynamics for a shipborne helicopter

Dingxuan ZHAO, Haojie YANG, Carbone GIUSEPPE, Wenhang LI, Tao NI, Shuangji YAO

Frontiers of Mechanical Engineering 2021, Volume 16, Issue 1,   Pages 151-162 doi: 10.1007/s11465-020-0617-z

Abstract: established based on small-angle approximation to improve the simulation model for shipborne helicopter landingResults show that the proposed dynamic model can simulate the collision motion of helicopter landingSeveral suggestions for helicopter pilot landing are likewise provided.

Keywords： shipborne helicopter     landing model     Lagrange equations     dynamics     validation    

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Buffer capacity of granular matter to impact of spherical projectile based on discrete element method

Ying YAN, Pengfei LI, Shunying JI

Frontiers of Structural and Civil Engineering 2013, Volume 7, Issue 1,   Pages 50-54 doi: 10.1007/s11709-013-0186-x

Abstract: Granular matter possesses impact-absorbing property due to its energy dissipation character. To investigate the impact-absorbing capacity of granular matter, the discrete element method (DEM) is adopted to simulate the impact of a spherical projectile on to a granular bed. The dynamic responses of the projectile are obtained for both thin and thick granular bed. The penetration depth of the projectile and the first impact peak are investigated with different bed thicknesses and impact velocities. Determining a suitable bed thickness is crucial to the buffering effect of granular matter. The first impact peak is independent of bed thickness when the thickness is larger than the critical thickness.

Keywords： granular matter     impact peak     buffer capacity     discrete element method     critical thickness    

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Study on a kind of new strengthening buffer operators and numerical simulations

Cui Jie,Dang Yaoguo,Liu Sifeng,Xie Naiming

Strategic Study of CAE 2010, Volume 12, Issue 2,   Pages 108-112

Abstract: the theory of prior using of new information,based on the research of already existed strengthening bufferoperators, some new strengthening buffer operators are established.The flaw that the existing strengthening buffer operators can,t fully use new information of the dataAn example simulation shows, compared with the existing strengthening buffer operators, the kind of newstrengthening buffer operators increases the forecast precision of GM(1,1) remarkably.

Keywords： operator     strengthening buffer operator     geometry average strengthening operator     GM(1     1)    

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Restoring soil health to reduce irrigation demand and buffer the impacts of drought

Rebecca SCHNEIDER, Stephen MORREALE, Zhigang LI, Erin MENZIES PLUER, Kirsten KURTZ, Xilu NI, Cuiping WANG, Changxiao LI, Harold VAN ES

Frontiers of Agricultural Science and Engineering 2020, Volume 7, Issue 3,   Pages 339-346 doi: 10.15302/J-FASE-2020348

Abstract:

Irrigation consumes three quarters of global water withdrawals each year. Strategies are needed to reduce irrigation water use, including increasing the efficiency of transfer methods and field application. Comprehensive restoration of soil health, specifically through organic matter amendments, can substantially reduce irrigation demand and increase crop yield. A program to restore severely degraded and desertified soils by incorporating coarse woodchips into the soil successfully increased rainfall capture and elevated soil moisture for several weeks between rainfall events at both Ningxia, north-west China and North Dakota, USA. With addition of fertilizer, woodchip incorporation further increased growth of wheat and alfalfa. Comprehensive soil health assessment of remnant grasslands was used to develop target reference soil profiles by which to guide restoration efforts. Given that most agricultural soils are degraded to some degree, soil health restoration can provide a powerful strategy toward achieving global food and water security.

Keywords： drought     irrigation     restoration     soil health     woodchips    

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Storage hierarchy oriented DPM policy based on task information

Huang Shaomin,Qi Longning,Yang Jun,Hu Chen

Strategic Study of CAE 2010, Volume 12, Issue 2,   Pages 83-89

Abstract:

Storage hierarchy oriented DPM, which uses buffer to prolong idle time

Keywords： data buffer     task information     DPM     prefetching policy    

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Effects of riparian land use on water quality and fish communities in the headwater stream of the Taizi River in China

Sen DING, Yuan ZHANG, Bin LIU, Weijing KONG, Wei MENG

Frontiers of Environmental Science & Engineering 2013, Volume 7, Issue 5,   Pages 699-708 doi: 10.1007/s11783-013-0528-x

Abstract: Riparian land use remains one of the most significant impacts on stream ecosystems. This study focuses on the relationship between stream ecosystems and riparian land use in headwater regions. Four riparian land types including forest, grassland, farmland, and residential land were examined to reveal the correlation between stream water and fish communities in headwater streams of the Taizi River in north-eastern China. Four land types along riparian of 3 km in length were evaluated at 25, 50, 100, 200 and 500 m widths, respectively. Generally, the results found a significant relationship between riparian land uses and stream water quality. Grassland was positively correlated with water quality parameters (conductivity and total dissolved solids) at scales from 100 to 500 m riparian width. Farmland and residential land was negatively correlated with water quality parameters at scales from 25 to 500 m and from 50 to 200 m riparian widths, respectively. Although the riparian forest is important for maintaining habitat diversity and fish communities, the results found that only fish communities were significantly correlated with the proportion of riparian farmland. Farmland had a positive correlation with individual fish abundance within a riparian corridor of 25 to 50 m, but a negative correlation with fish diversity metrics from 25 to 100 m. This study indicates that effective riparian management can improve water quality and fish communities in headwater streams.

Keywords： fish     water quality     land use     riparian buffer     headwater stream    

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Embedding expert demonstrations into clustering buffer for effective deep reinforcement learning Research Article

Shihmin WANG, Binqi ZHAO, Zhengfeng ZHANG, Junping ZHANG, Jian PU

Frontiers of Information Technology & Electronic Engineering 2023, Volume 24, Issue 11,   Pages 1541-1556 doi: 10.1631/FITEE.2300084

Abstract: Then we introduce a clustering buffer for modeling the internal hierarchy, which consists of on-policy

Keywords： Reinforcement learning     Sample efficiency     Sampling process     Clustering methods     Autonomous driving    

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The Present Situation and Prospect of China's Space-entering Capacity

Long Lehao,Wang Xiaojun,Guo Linli

Strategic Study of CAE 2006, Volume 8, Issue 11,   Pages 25-28

Abstract: rockets that can be launched quickly and flexibly; developing launching vehicles capable of manned lunar landing

Keywords： space activities     “Long-March” rocket family     manned lunar landing     reusable launching vehicles    

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Performance analysis of the stop-and-wait automatic repeat request protocol under Markovian interruptions Regular Papers-Research Articles

Dashdondov KHONGORZUL, Yong-Ki KIM, Mi-Hye KIM

Frontiers of Information Technology & Electronic Engineering 2019, Volume 20, Issue 9,   Pages 1296-1306 doi: 10.1631/FITEE.1700185

Abstract: We introduce the concept of buffer occupancy to simplify the analysis, and discover that data multiplexers

Keywords： Stop-and-wait ARQ protocol     Markovian interruptions     Poisson distribution     Buffer occupancy     Waiting time    

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Survey of autonomous guidance methods for powered planetary landing Review

Zheng-yu Song, Cong Wang, Stephan Theil, David Seelbinder, Marco Sagliano, Xin-fu Liu, Zhi-jiang Shao,zycalt12@sina.com

Frontiers of Information Technology & Electronic Engineering 2020, Volume 21, Issue 5,   Pages 649-808 doi: 10.1631/FITEE.1900458

Abstract: ., the lunar, Mars, and Earth landing.

Keywords： 自主制导方法；定点软着陆；动力下降；非线性规划    

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Watt Linkage–Based Legged Deployable Landing Mechanism for Reusable Launch Vehicle: Principle, Prototype Article

Haitao Yu,Baolin Tian,Zhen Yan,Haibo Gao,Hongjian Zhang,Huiqiang Wu,Yingchao Wang,Yuhong Shi,Zongquan Deng

Engineering 2023, Volume 20, Issue 1,   Pages 120-133 doi: 10.1016/j.eng.2022.05.015

Abstract: The landing mechanism, which provides landing support and impact absorption, is a vital component ofThis study proposes a novel legged deployable landing mechanism (LDLM) for RLV.To endow the proposed LDLM with advantages of large landing support region, lightweight, and reasonable

Keywords： Reusable launch vehicle (RLV)     Deployable mechanism     Optimization design    

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Title Author Date Type Operation

Landing control method of a lightweight four-legged landing and walking robot

Journal Article

Opinion on Space Launch and Manned Lunar-landing

Zhang Zeming ,Jiang Yi ,Fu Debin

Journal Article

Estimation of fatigue damage of airplane landing gear

LIU Ke-ge, YAN Chu-liang, ZHANG Shu-ming

Journal Article

Planar jumping with stable landing through foot orientation design and ankle joint control

Qilong YUAN, I-Ming CHEN

Journal Article

Modeling and analysis of landing collision dynamics for a shipborne helicopter

Dingxuan ZHAO, Haojie YANG, Carbone GIUSEPPE, Wenhang LI, Tao NI, Shuangji YAO

Journal Article

Buffer capacity of granular matter to impact of spherical projectile based on discrete element method

Ying YAN, Pengfei LI, Shunying JI

Journal Article

Study on a kind of new strengthening buffer operators and numerical simulations

Cui Jie,Dang Yaoguo,Liu Sifeng,Xie Naiming

Journal Article

Restoring soil health to reduce irrigation demand and buffer the impacts of drought

Rebecca SCHNEIDER, Stephen MORREALE, Zhigang LI, Erin MENZIES PLUER, Kirsten KURTZ, Xilu NI, Cuiping WANG, Changxiao LI, Harold VAN ES

Journal Article

Storage hierarchy oriented DPM policy based on task information

Huang Shaomin,Qi Longning,Yang Jun,Hu Chen

Journal Article

Effects of riparian land use on water quality and fish communities in the headwater stream of the Taizi River in China

Sen DING, Yuan ZHANG, Bin LIU, Weijing KONG, Wei MENG

Journal Article

Embedding expert demonstrations into clustering buffer for effective deep reinforcement learning

Shihmin WANG, Binqi ZHAO, Zhengfeng ZHANG, Junping ZHANG, Jian PU

Journal Article

The Present Situation and Prospect of China's Space-entering Capacity

Long Lehao,Wang Xiaojun,Guo Linli

Journal Article

Performance analysis of the stop-and-wait automatic repeat request protocol under Markovian interruptions

Dashdondov KHONGORZUL, Yong-Ki KIM, Mi-Hye KIM

Journal Article

Survey of autonomous guidance methods for powered planetary landing

Zheng-yu Song, Cong Wang, Stephan Theil, David Seelbinder, Marco Sagliano, Xin-fu Liu, Zhi-jiang Shao,zycalt12@sina.com

Journal Article

Watt Linkage–Based Legged Deployable Landing Mechanism for Reusable Launch Vehicle: Principle, Prototype

Haitao Yu,Baolin Tian,Zhen Yan,Haibo Gao,Hongjian Zhang,Huiqiang Wu,Yingchao Wang,Yuhong Shi,Zongquan Deng

Journal Article