The advancement of terahertz (THz) communication technology drives the evolution of wireless communication systems,offering novel pathways and technical means for the development of future 6G communication *** wireles...
The advancement of terahertz (THz) communication technology drives the evolution of wireless communication systems,offering novel pathways and technical means for the development of future 6G communication *** wireless communication systems are often constrained by bandwidth limitations of electronic devices in high frequency ***,THz communication technology leverages the characteristics of electromagnetic waves to transcend these limitations,enabling communication athigher frequencies and wider bandwidths.
The failure of electrical equipment directly or indirectly caused by overheating has become one of the main reasons for equipment *** real-time condition monitoring method of electrical equipment based on digital twin...
详细信息
The failure of electrical equipment directly or indirectly caused by overheating has become one of the main reasons for equipment *** real-time condition monitoring method of electrical equipment based on digital twin(DT)has received extensive attention and is considered as a technology with great engineering values and excellent application ***,the current calculation of DT mostly relies on the traditional finite element method(CFEM).This method becomes less computationally efficient as the size of the DT increases,especially for electrical equipment with high *** is difficult to meet the requirements real-time calculation in ***,starting from the algorithm optimization and parallel architecture,based on the weighted residual method and stabilised conforming nodal integration,a novel discrete method of electrothermal coupling equation is proposed and the data storage structure of the algorithm from the bottom layer is redesigned,and the corresponding GPU and multi-core CPU parallel framework are ***,taking the high voltage bushing as an example,the correctness of the method in this paper is verified by the CFEM code and commercial software *** the same grid and accuracy requirement,the calculation time is shortened by at least five times than *** the method is easy to extend to other types of multi-physics calculations.
The electrically driven large-load-ratio six-legged robot with engineering capability can be widely used in outdoor and planetary ***,due to the particularity of its parallel structure,the effective utilization rate o...
详细信息
The electrically driven large-load-ratio six-legged robot with engineering capability can be widely used in outdoor and planetary ***,due to the particularity of its parallel structure,the effective utilization rate of energy is not high,which has become an important obstacle to its practical *** research the power consumption characteristics of robot mobile system is beneficial to speed up it toward *** on the configuration and walking modes of robot,the mathematical model of the power consumption of mobile system is set *** view of the tripod gait is often selected for the six-legged robots,the simplified power consumption model of mobile system under the tripod gait is established by means of reducing the dimension of the robot’s statically indeterminate problem and constructing the equal force ***,the power consumption of robot mobile system is solved under different working *** variable tendencies of the power consumption of robot mobile system are respectively obtained with changes in the rotational angles of hip joint and knee joint,body height,and *** articulated rotational zones and the ranges of body height and span are determined under the lowest power *** to the walking experiments of prototype,the variable tendencies of the average power consumption of robot mobile system are respectively acquired with changes in duty ratio,body height,and ***,the feasibility and correctness of theory analysis are verified in the power consumption of robot mobile *** proposed analysis method in this paper can provide a reference on the lower power research of the large-load-ratio multi-legged robots.
This paper investigates a reconfigurable space manipulator's inverse kinematics (IK) with two lockable passive telescopic links (LPTLs). Depending on these LPTLs' locking state, the manipulator includes free-s...
详细信息
Surface roughness and thermal action are of remarkable importance in the lubrication performance of mechanical components,especially in extreme ***,available studies mainly focus on the full-film lubrication condition...
详细信息
Surface roughness and thermal action are of remarkable importance in the lubrication performance of mechanical components,especially in extreme ***,available studies mainly focus on the full-film lubrication conditions without considering temperature rise and real 3D surface roughness due to the complexity of surface topography and temperature ***,studies on the interfacial thermal behaviors of 3D rough surface lubricated contact in an extended range of working conditions remain *** this paper,a deterministic mixed thermal elastohydrodynamic lubrication model considering real 3D surface roughness and thermal effects is *** this model,pressure and temperature are coupled with each other,the computation of elastic deformation is accelerated through the discrete convolution and fast Fourier transform method,the temperature field is calculated with the column sweeping technique,and the semi-system method is introduced to improve convergence and numerical stability under severe *** model is validated by comparing its results with available published numerical and experimental *** thermal behaviors of the contact interface are studied in a wide range of working *** influences of surface roughness and thermal effect on lubrication performance are *** results show that the proposed model can be used as a powerful analysis tool for lubrication performance and temperature prediction in various heavy-load,high-speed lubricated components over a wide range of lubrication conditions.
Hybrid joint-space control strategy, where some redundant cables are force control, while other cables perform the length control, has the ability to control the robots with small pose errors, and maintain all ca...
详细信息
This paper presents a precision centimeter-range positioner based on a Lorentz force actuator using flexure *** additional digital-to-analog converter and an operational amplifier(op amp)circuit together with a suitab...
详细信息
This paper presents a precision centimeter-range positioner based on a Lorentz force actuator using flexure *** additional digital-to-analog converter and an operational amplifier(op amp)circuit together with a suitable controller are used to enhance the positioning accuracy to the nanometer ***,a suitable coil is designed for the actuator based on the stiffness of the flexure guide *** flexure mechanism and actuator performance are then verified with finite element *** on these,a means to enhance the positioning performance electronically is presented together with the control ***,a prototype is fabricated,and the performance is *** positioner features a range of 10 mm with a resolution of 10 *** proposed scheme can be extended to other systems.
This paper presents a general method for dynamic modeling of three-dimensional flexible manipulator with multiple degrees of freedom based on Lagrange’s second kind of dynamic equation. Firstly, the dynamic model of ...
详细信息
Birds in nature exhibit excellent long-distance flight capabilities through formation flight,which could reduce energy consumption and improve flight *** by the biological habits of birds,this paper proposes an autono...
详细信息
Birds in nature exhibit excellent long-distance flight capabilities through formation flight,which could reduce energy consumption and improve flight *** by the biological habits of birds,this paper proposes an autonomous formation flight control method for Large-sized Flapping-Wing Flying Robots(LFWFRs),which can enhance their search range and flight ***,the kinematics model for LFWFRs is ***,an autonomous flight controller based on this model is designed,which has multiple flight control modes,including attitude stabilization,course keeping,hovering,and so ***,a formation flight control method is proposed based on the leader–follower strategy and periodic characteristics of flapping-wing *** up and down fluctuation of the fuselage of each LFWFR during wing flapping is considered in the control algorithm to keep the relative distance,which overcomes the trajectory divergence caused by sensor delay and fuselage ***,typical formation flight modes are realized,including straight formation,circular formation,and switching ***,the outdoor formation flight experiment is carried out,and the proposed autonomous formation flight control method is verified in real environment.
Grasping occluded objects is a large challenge for hand amputees because of the hand's perception loss. This paper proposed an alternative approach based on artificial vision and augmented reality technology, term...
详细信息
暂无评论