Copper is one of the ductile materials which is difficult to machine, but extensively used in variety of applications such as electrical, thermal and nuclear. Turning is one of the predominantly used lathe operation, ...
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In this paper,we develop an exhaustive numerical simulator for the dynamic visualization and behavior prediction of the tether-net system during the whole space debris capture phases,including spread,contact,and *** o...
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In this paper,we develop an exhaustive numerical simulator for the dynamic visualization and behavior prediction of the tether-net system during the whole space debris capture phases,including spread,contact,and *** of all,to perform its geometrically nonlinear deformation,discrete different geometry theory is applied to model the mechanical response of a flexible *** on the discretization of the whole structure into multiple vertexes and lines,the internal force and associated Hession are derived in a closed form to solve a series of nonlinear dynamic equations of *** spread and deployment of a packaged net can be realized using this well-established net ***,a multidimensional incremental potential formulation is selected to achieve the intersection-free boundary nonlinear contact and collision between the deformable net and rigid ***,for the closing mechanism analysis,a log-like barrier functional is derived to achieve the nondeviation condition between the ring–rod linkage *** C2 continuous log barrier functionals constructed for both the contact model and the linkage system are smooth and differentiable,and,therefore,the nonlinear net capture dynamic system can be efficiently solved through a fully implicit time ***,as a demonstration,the whole capture process of a defunct satellite using a hexagon net is simulated through our well-established numerical *** believe that our comprehensive numerical methods could provide new insight into the optimal design of active debris removal systems and promote further development of the online control of tether tugging systems.
Optimisation of machining processes has been an active research area for over six decades. In the last three decades, several evolutionary optimisation methods have been utilised. This paper offers a brief history of ...
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The lightweight design of the receiver plays a pivotal role in the application of wireless power transfer (WPT) technology to intelligent devices, such as unmanned underwater vehicle (UUV) and autonomous aerial vehicl...
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Long term energy transition planning presents a significant challenge to planners in Canada striving to meet national climate goals. This is exaggerated for northern territories, where barriers and considerations aris...
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Detecting ignitable liquids (ILs) at the fire scene is essential for fire investigation. Electronic nose (e-nose) plays a crucial role in the detection of ILs due to its low cost and rapid response. However, when we u...
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This study proposes a data-driven safety controller with velocity constraints for a cushion robot. We constructed a mathematical description of the human-machine interaction environment by decomposing the generalized ...
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Large-scale flapping-wing flying robotic birds have huge application potential in outdoor tasks,such as military reconnaissance,environment exploring,disaster rescue and so *** this paper,a multiple modes flight contr...
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Large-scale flapping-wing flying robotic birds have huge application potential in outdoor tasks,such as military reconnaissance,environment exploring,disaster rescue and so *** this paper,a multiple modes flight control method and system are proposed for a large-scale robotic bird which has 2.3 m wingspan and 650 g *** from small flapping wing aerial vehicle,the mass of its wings cannot be neglected and the flapping frequency are much ***,the influence of transient aerodynamics instead of only mean value are considered in attitude estimation and controller ***,flight attitude and trajectory are highly coupled,and the robot has only three actuators----one for wings flapping and two for tail adjustment,it is very difficult to simultaneously control the attitude and ***,a fuzzy control strategy is addressed to determine the command of each actuator by considering the priority of attitude stabilization,trajectory tracking and the flight ***,the on-board controller is designed based on *** not only satisfies the strict restrictions on mass,size,power and space but also meets the autonomous,semi-autonomous and manual flight control ***,the developed control system was integrated to the robotic prototype,*** experiments under different environment conditions such as sunny and windy weather were completed to verify the control method and system.
Microparticle manipulation actuating by external fields, magnetic fields and acoustic fields, are attractive for lab-on-chip systems and microscale medical applications since they allow for the manipulation of micropa...
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Continuum manipulators have proven their importance in applications requiring high articulation and their use in confined space usability. However, their control continues to remain a challenge. This paper proposes a ...
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