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| 1 | Placement suitability criteria of composite tape for mould surface in automated tape placement显示文摘Automated tape placement is an important automated process used for fabrication of large composite structures in aeronautical industry. The carbon fiber composite parts realized with this process tend to replace the aluminum parts produced by high-speed machining. It is difficult to determine the appropriate width of the composite tape in automated tape placement. Wrinkling will appear in the tape if it does not suit for the mould surface. Thus, this paper deals with establishing placement suitability criteria of the composite tape for the mould surface. With the assumptions for ideal mapping and by applying some principles and theorems of differential geometry, the centerline trajectory of the composite tape is identified to follow the geodesic. The placement suitability of the composite tape is examined on three different types of non-developable mould surfaces and four criteria are derived. The developed criteria have been used to test the deposition process over several mould surfaces and the appropriate width for each mould surface is obtained by referring to these criteria. | Zhang Peng Sun Ronglei Zhao Xueying Hu Lingjin | 2015 | Chinese Journal of Aeronautics2015，28，5： | 5 |
| 2 | Innovative Design and Performance Evaluation of a High-speed Bionic Mechanical Leg显示文摘 | Hua Nie Ronglei Sun Chaoke Guo Guohua Qin Huiyang Yu | 2015 | Journal of Bionic Engineering2015，12，3： | 3 |
| 3 | Control of a Cheetah Robot in Passive Bounding Gait显示文摘 | Hua Nie Ronglei Sun Liya Hu Zhendong Su Wenqiang Hu | 2016 | Journal of Bionic Engineering2016，13，2： | 3 |
| 4 | Iterative learning scheduling: A combination of optimization and dispatching rules显示文摘 | Sun Ronglei Ding Han Xiong Youlun | 2004 | J of Manufacturing Technology Management2004，15，3： | 1 |
| 5 | Fungal spore record of pastoralism on the NE Qinghai-Tibetan Plateau since the middle Holocene显示文摘Pastoralism is considered a crucial factor in the eventual year-round occupation of high-altitude regions(>3000 m asl)of the Qinghai-Tibetan Plateau,and the northeastern Qinghai-Tibetan Plateau(NE-QTP)was an important corridor for early human occupation.We analyzed fossil fungal spore records for the last 8500 years from a high resolution aeolian section at Langgeri(LGR)on the NE-QTP.Thirty-two fungal spore types were identified in the LGR section,including seven coprophilous types.We combined analysis of coprophilous fungal spores,Cyperaceae,Artemisia,and Hippophae pollen,and the charcoal>50µm fraction to explore the timing and controls of pastoralism on the NE-QTP since the middle Holocene.Pastoralism commenced at LGR shortly before ca.5.5 ka and gradually increased between ca.5.5–3.5 ka,but markedly intensified after ca.2.2 ka,with three periods of growth at ca.2.1–1.9,1.4–1.2,and 0.6–0 ka,and a decline at ca.1.1–0.6 ka.The timing of changes in pastoral activity on the NE-QTP based on the coprophilous fungal spore record is supported by regional archeology and historical documents.Technological and political developments,rather than climate change,played key roles in the long-term fluctuations of regional pastoralism on the NE-QTP in the late Holocene. | Haicheng WEI Chongyi E Ronglei DUAN Jing ZHANG Yongjuan SUN Guangliang HOU Jingyi GAO | 2021 | Science China Earth Sciences2021，64，8： | 1 |
| 6 | A Biologically Inspired Cross-Type Ankle–Foot Exotendon:Assisting Plantarflexion Moment and Movement Stability显示文摘Cable-driven ankle–foot exoskeletons have attracted numerous researchers over the previous decade.The assistive forces of most exoskeletons pulled the back bottom of the shoes,across talocrural and subtalar joints.The talocrural joint is inherently mediolateral unstable at the plantarflexion position due to its sliding mortise structure,while the subtalar joint allows inversion/eversion.In this paper,a biologically inspired cross-type double-cable-driven ankle–foot exotendon was proposed to assist not only the plantarflexion moment but also the movement stability.The novel structure was bio-inspired by the behind-calf anatomically symmetric layout and under-foot cross-configuration of the ankle–foot muscles.To examine the combined functions,we conducted a forward pelvis perturbed standing experiment on five subjects without and with exotendon assistance and recorded the biomechanical data.Compared to the unpowered condition,the biological ankle plantarflexion moment was reduced by 39 with 0.1 Nm/kg exotendon assistance for one leg.Besides,the forward margin of stability was increased by 17 during the late perturbation period,which indicated the improvement of balance in the sagittal plane.In addition,the standard deviation of the lateral CoP and three-dimensional marker trajectories for the ankle condylar and heel all descended,which provided evidence for ankle–foot stability improvement.The results suggested that the proposed biological exotendon can provide the compound ankle–foot assistance,reducing plantarflexion moment and improving movement stability. | Yuyao Liu Ronglei Sun Ying Li Miao Zhang Kaijie Zou | 2023 | Journal of Bionic Engineering2023，20，6： | 0 |
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