Motion

摘要： 该文以某型飞机起落架及舱门收放系统为研究对象,采用VL motion与AMESim软件分别对起落架运动机构和液压控制系统建立模型并进行联合仿真,利用联合仿真模型求解得到起落架及舱门收放时间和流量需求并验证其符合性。结果表明:通过基于VL motion与AMESim的联合仿真可完成起落架在预定时间内的收放功能,可为飞机起落架收放系统设计及部件参数优化提供参考。

摘要： A practical experimental method is proposed to investigate thermal transport by characterizing the motion of plasma flows through a x-ray spectroscopic technique using tracers.By simultaneously measuring multiple parameters,namely,the mass-ablation rate,the temporal evolution of plasma flow velocities and trajectories and the temperature,it is possible to observe a variety of physical processes,such as shock wave compression,heating by thermal waves,and plasma thermal expansion,and to determine their relative importance in different phases during the irradiation of CH and Au targets.From a comparison with hydrodynamic simulations,we find significant differences in the motion of the plasma flows between CH and Au,which can be attributed to different sensitivities to the thermal transport process.There are also differences in the ablation and electron temperature histories of the two materials.These results confirm that velocities and trajectories of plasma motion can provide useful evidence in the investigation of thermal conduction,and the approach presented here deserves more attention in the context of inertial confinement fusion and high-energy-density physics.

摘要： Research on micro-machines is becoming popular.In this paper,the electric driving behavior of liquid metal columns in confining channel was studied.When the electric field was applied,the liquid metal near the negative electrode became flat,longer.The NaOH electrolyte(1.0 mol/L)could flow from the positive electrode to the negative electrode from a small space above the liquid metal column.Besides,the length and volume of the liquid metal would affect its motion and deformation behavior.Both cylindrical liquid column(R=5 mm,L=5 cm)and linear liquid column(R=5 mm,L=40 cm)exhibit deformable movements,which are similar to the bionic movements of earthworms.The electrically driven liquid metal in closed systems could provide a theoretical basis for droplet actuation in microtubes.It has a very wide application prospect in the field of micro-drive machines.

摘要： Rapid changes in the Arctic climate and those in Arctic sea ice in recent decades are closely coupled.In this study,we used atmospheric reanalysis data and satellite remote sensing products to identify anomalies of meteorological and sea ice conditions during the ice season of 2018-2019 relative to climatological means using a Lagrangian methodology.We obtained the anomalies along the drifting trajectories of eight sea ice mass balance buoys between the marginal ice zone and the pack ice zone in the western Arctic Ocean(~160°W-170°W and 79°N-85°N)from September 2018 toAugust 2019.The temporary collapse of the Beaufort High and a strong positive Arctic Dipole in the winter of 2018-2019 drove the three buoys in the north to drift gradually northeastward and merge into the Transpolar Drift Stream.The most prominent positive temperature anomalies in 2018-2019 along the buoy trajectories relative to 1979-2019 climatology occurred in autumn,early winter,and April,and were concentrated in the southern part of the study area;these anomalies can be partly related to the seasonal and spatial patterns of heat release from the Arctic ice-ocean system to the atmosphere.In the southern part of the study area and in autumn,the sea ice concentration in 2018-2019 was higher than that averaged over the past 10 years.However,we found no ice concentration anomalies for other regions or seasons.The sea ice thickness in the freezing season and the snow depth by the end of the winter of 2018-2019 can also be considered as normal.Although the wind speed in 2018-2019 was slightly lower than that in 1979-2019,the speed of sea ice drift and its ratio to wind speed were significantly higher than the climatology.In 2019,the sea ice surface began to melt at the end of June,which was close to the 1988-2019 climatology.However,spatial variations in the onsets ofsurface melt in 2019 differed from the climatology,and can be explained by the prevalence of a high-pressure system in the south of the Beaufort Sea in June 2019.In addition to seasonal variations,the meteorological and sea ice anomalies were influenced by spatial variations.By the end of summer 2019,the buoys had drifted to the west of the Canadian Arctic Archipelago,where the ice conditions was heavier than those at the buoy locations in early September 2018.The meteorological and sea ice anomalies identified in this study lay the foundations for subsequent analyses and simulations of sea ice mass balance based on the buoy data.

摘要： In signal processing,multiresolution decomposition techniques allow for the separation of an acquired signal into sub levels,where the optimal level within the signal minimises redundancy,uncertainties,and contains the information required for the characterisation of the sensed phenomena.In the area of physiological signal processing for prosthesis control,scenarios where a signal decomposition analysis are required:the wavelet decomposition(WD)has been seen to be the favoured time-frequency approach for the decomposition of non-stationary signals.From a research perspective,the WD in certain cases has allowed for a more accurate motion intent decoding process following feature extraction and classification.Despite this,there is yet to be a widespread adaptation of the WD in a practical setting due to perceived computational complexity.Here,for neuro-muscular(electromyography)and brainwave(electroencephalography)signals acquired from a transhumeral amputee,a computationally efficient time domain signal decom-position method based on a series of heuristics was applied to process the acquired signals before feature extraction.The results showed an improvement in motion intent decoding prowess for the proposed time-domain-based signal decomposition across four different classifiers for both the neuromuscular and brain wave signals when compared to the WD and the raw signal.

摘要： 飞机起落架收放系统是以液压控制系统驱动起落架机构运动的综合复杂系统,涉及运动学、多体系统动力学、液压控制等方面内容.为研究起落架收放系统特性,以某型机工作原理和数字样机为例,采用Simcenter 3 D Motion和AMESim建立了基于全机的起落架机构和液压控制系统的联合仿真模型.将起落架收放机构的负载仿真结果与某型飞机实测数据进行对比,两者基本吻合,说明该仿真可作为起落架收放系统设计及深入研究的依据.根据仿真结果,对起落架收放机构负载、收放速度以及液压控制系统的压力、流量响应特性进行了深入研究,同时对飞机各起落架相互作用的影响进行分析.

摘要： Locomotion is a fundamental interaction technique that allows free navigation in virtual scenes.A large body of literature has demonstrated that natural locomotion experience can significantly improve the sense of presence and help users achieve better performance in tasks such as searching and training.In the upcoming metaverse era,locomotion will play a critical role in the success of large-scale interactive applications.Perception and redirection are two tightly connected problems in virtual locomotion.Given a limited physical condition and a target virtual scene,how to make the perceived locomotion as natural as possible,and further unknowingly redirect the user in the physical world is an open question.In this special issue,we have selected five papers that provide their latest updates for research problems of view control,virtual jumping,climbing,and searching.

摘要： This article reports the various methods used to assess diaphragmatic function by ultrasonography.The excursions of the two hemidiaphragms can be measured using two-dimensional or M-mode ultrasonography,during respiratory maneuvers such as quiet breathing,voluntary sniffing and deep inspiration.On the zone of apposition to the rib cage for both hemidiaphragms,it is possible to measure the thickness on expiration and during deep breathing to assess the percentage of thickening during inspiration.These two approaches make it possible to assess the quality of the diaphragmatic function and the diagnosis of diaphragmatic paralysis or dysfunction.These methods are particularly useful in circumstances where there is a high risk of phrenic nerve injury or in diseases affecting the contractility or the motion of the diaphragm such as neuro-muscular diseases.Recent methods such as speckle tracking imaging and ultrasound shear wave elastography should provide more detailed information for better assessment of diaphragmatic function.

摘要： 介绍了Virtual.Lab/Motion 软件的车辆建模和分析过程。仿真表明,利用Virtual.Lab/Motion 软件技术,可对车辆进行动力学 仿真,达到缩短试验检测周期的目的。

摘要： 介绍了Virtual.Lab/Motion 软件的车辆建模和分析过程。仿真表明,利用Virtual.Lab/Motion 软件技术,可对车辆进行动力学 仿真,达到缩短试验检测周期的目的。

摘要： 介绍了Virtual.Lab/Motion 软件的车辆建模和分析过程。仿真表明,利用Virtual.Lab/Motion 软件技术,可对车辆进行动力学 仿真,达到缩短试验检测周期的目的。

摘要： 介绍了Virtual.Lab/Motion 软件的车辆建模和分析过程。仿真表明,利用Virtual.Lab/Motion 软件技术,可对车辆进行动力学 仿真,达到缩短试验检测周期的目的。

摘要： 介绍了Virtual.Lab/Motion 软件的车辆建模和分析过程。仿真表明,利用Virtual.Lab/Motion 软件技术,可对车辆进行动力学 仿真,达到缩短试验检测周期的目的。

摘要： 介绍了Virtual.Lab/Motion 软件的车辆建模和分析过程。仿真表明,利用Virtual.Lab/Motion 软件技术,可对车辆进行动力学 仿真,达到缩短试验检测周期的目的。

摘要： 本发明公开了一种基于Leap Motion的手指无接触绘图方法及系统，采用SVM算法进行静态手势识别，采用静态手势和运动追踪数据约束性条件相结合的方法识别动态手势，根据识别的静态手势和动态手势判断用户手势动作，应用QT信号槽机制实现识别后的手势数据与绘画系统之间的通信，不同的手势动作对应不同事件，响应不同的处理，再将运动追踪数据中食指指尖在传感器观察坐标系下的位置映射为屏幕坐标系下画笔的位置，实现图形和线条的绘制，完成手指无接触绘图。本发明具备趣味性以及更加自然的人机交互方式，灵活度与自由度更高，具备良好的互动性；且容易被接受和掌握，尤其适合老人和孩童群体，具有广泛的应用前景。

摘要： 本发明涉及一种Kinect v2和Leap Motion的数据融合的手势识别方法，其特征在于具体实现步骤如下：1、设备的布置；2、利用Kinect v2得到人体的深度图，并利用中间件OpenNi和Nite2取得人手的中心，然后对Kinect v2的深度图进行处理；3、深度图像预处理，4、得到指尖的空间坐标；5、初步的联合标定；6、两个Leap Motion的数据的精细配准；7、Kinect v2和基准Leap Motion之间的数据的精细配准；8、数据在时间上的对准；9、两种体感设备数据的采信方案；10、采信识别手指是运动的那个Leap Motion的数据。可以由Kinect v2扩展手的活动空间，提高了系统人机自然交互的效果，提高了手势的识别率。

摘要： 一种基于Leap Motion手势识别的虚拟康复游戏的自调整方法，包括：建立数据库、患侧手部参与康复将所述患侧手部图像数据和健侧手势数据库中的健侧手部图像数据在游戏时域进行动作幅度对比；根据游戏难度等级级别数据自动对游戏进行难度调整。本发明对游戏难度进行分级，根据患者患侧当前游戏周期的表现与健侧表现进行对比，参考患者健、患侧表现记录，自动降低或提高游戏难度参数，避免因患者产生疲劳以及游戏难度过大或过小影响康复游戏的康复效果。同时能够实时让患者看到自己的游戏表现，并且给予患者反馈鼓励患者游戏积极性，让患者一直处于难度适中的游戏环境中，既有挑战性，又不失乐趣地完成自己的康复训练计划的目的。

摘要： 本发明公开了一种基于Leap Motion交互的仿生机器鱼控制系统，操作者可通过单手指或多手指运动轨迹来完成对机器鱼单体或多体的路径控制，提高人‑鱼交互的多样性和智能性。上位机交互平台通过Leap Motion对操作者的手部信息进行采集，包括双手、多手指的运动轨迹数据；然后基于机器鱼运动学模型，结合B样条曲线(B‑Spline)规划出切实可行的单体或多体的表演轨迹；最后将连续轨迹点离散成位置‑时间序列，由无线通信的方式传递给机器鱼。机器鱼接收到控制起始指令及位置‑时间路径点后，按照预设轨迹进行游动，游动过程中由ArUco码与惯性导航模块进行位姿的实时反馈，机器鱼控制器对实际测量位姿与预设位姿进行对比，利用PID算法进行实时修正，直至完成轨迹点的完全跟踪。

摘要： 本发明公开一种基于肌电信号和Leap Motion的实时手势识别系统，包括刺激模块、数据采集模块、肌电信号分类模块、Leap Motion分类模块、分类结果融合模块和结果输出模块；刺激模块发出提示音对使用者进行手势引导；采集模块采集使用者做手势过程中的有效肌电信号以及图像信号；肌电信号分类模块对有效肌电信号进行降噪处理和特征提取得到特征向量，并进行多分类；Leap Motion分类模块利用图像信号进行手势分类识别；分类结果融合模块将肌电信号分类模块与Leap Motion分类模块的分类结果采用粒子群方法进行决策级融合；结果输出模块对最终实时分类结果进行输出显示，本发明能够实现实时识别手势。

摘要： 一种基于Leap Motion手势识别的虚拟康复游戏的自调整方法，包括：建立数据库、患侧手部参与康复将所述患侧手部图像数据和健侧手势数据库中的健侧手部图像数据在游戏时域进行动作幅度对比；根据游戏难度等级级别数据自动对游戏进行难度调整。本发明对游戏难度进行分级，根据患者患侧当前游戏周期的表现与健侧表现进行对比，参考患者健、患侧表现记录，自动降低或提高游戏难度参数，避免因患者产生疲劳以及游戏难度过大或过小影响康复游戏的康复效果。同时能够实时让患者看到自己的游戏表现，并且给予患者反馈鼓励患者游戏积极性，让患者一直处于难度适中的游戏环境中，既有挑战性，又不失乐趣地完成自己的康复训练计划的目的。

摘要： 本发明公开一种基于Leap Motion的拇指弹琴触键动作测量平台及方法，测量平台包括测量平台框架、上平台玻璃面、下平台玻璃面、触键限位结构和Leap Motion传感器，所述测量平台框架是由连接杆和角码相互连接组成的长方体框架结构，所述测量平台框架的顶部放置有所述上平台玻璃面，测量平台框架的底部设置有下平台玻璃面，所述下平台玻璃面的上表面放置有所述Leap Motion传感器，测量平台框架顶部其中两侧的连接杆相对称的设置有轨道，所述轨道内可活动的连接有触键限位结构。本发明基于Leap Motion的拇指弹琴触键动作测量平台，能够在十分贴近自然状态下进行拇指弹琴触键动作的采集，并对采集数据进行分析，得到拇指弹琴触键运动数据及规律。

摘要： 本发明公开了一种motion安全线水转印纸的制作方法，包括：步骤A：提供一成型基材；步骤B：在成型基材的一侧上压印形成呈球面状的反光珠，在另一侧上压印形成与反光珠相对的图案凹槽；步骤C：将成型基材反光珠的一侧烫印在水转印载体，得到motion安全线水转印纸。本发明制作方法制作的motion安全线水转印纸，在成型基材上形成反光珠和图案凹槽后，将成型基材反光珠的一侧烫印在水转印载上，不需要PET保护膜作为载体，可以使得motion安全线烧结在陶瓷制品、玻璃制品等产品，并且不会翘起、脱落，增加了motion安全线的应用范围。

摘要： 本发明描述了一种基于Leap motion体感传感器，结合BPN神经网络，对三维手势信息进行处理，最终识别出手势的方法。整个过程包含3个阶段，即用户指定特殊手势图像采集阶段、对作为BPN神经网络输入的三维手势信息进行降维操作阶段、BPN神经网络实现手势识别阶段。先由用户自定义一组动态多帧的手势识别集合，绑定名称标签。从驱动层保存得到的这些信息要进行长样本的切割，取舍，降维操作。再将其作为BPN神经网络的输入，进行网络训练使其达到收敛，从而实现在线识别各种手势的最终目标。本发明可对用户定义的三维手势动作进行高精度高速率的识别检测，并实时输出打印所识别的动作名称，亦能保证网络训练和识别的同步进行。对聋哑人与常人交流有重要意义。

摘要： 本实用新型公开了一种motion安全线水转印纸和具有motion安全线的制品，包括水转印载体、成型基材、离型层和离型保护膜。所述成型基材设置在所述水转印载体上。所述成型基材一侧上形成有呈球面状的反光珠，另一侧形成有与反光珠相对的图案凹槽。所述反光珠朝向所述水转印载体。所述离型层设置在所述成型基材的另一侧上。所述离型保护膜设置在所述离型层上。本实用新型的motion安全线水转印纸，可以使得motion安全线烧结在陶瓷制品、玻璃制品等产品，并且不会翘起、脱落，增加了motion安全线的应用范围。