The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Asteroid landing is a new research field in deep space exploration, which has important scientific and economic values in learning the origin of the solar system and exploring the asteroid. It is microgravity and little media properties are obtained on the asteroid surface, thus good landing performance is demanded to realize safe landing of the landing mechanism. Landing mechanism in the paper has...
Over flow protection valve is the key equipment to protect thydraulic system with large potential energy, but irreversible malfunction may occur on valve when it under shock condition. Therefore the anti-shock design of the valve is critical. Considering the two stage structure of the valve, mathematic model of over flow protection valve is established. FLUENT is introduced to calculate the flow field...
Fast switching fluid power valves set strict requirements on performance, size and energy efficiency and simulation models are therefore needed to obtain good designs of such components. The valve moving member is subject to fluid forces depending on the valve flow rate and movement of the valve member itself. These fluid forces may be accurately simulated using Computational Fluid Dynamics (CFD)...
Variable-rate tree spraying is one of the most important technique of precision agriculture. This paper presented an interactive virtual tree spraying method based on particle system, which gain fine control flexible through parameters such as the emitter position and pitch angle, atomizing particle, atomizing anger and spray penetration depth. We proposed a 2-hierarchy collision detection algorithm...
Autonomous vehicles can risk dangerous rollover if they corner without taking roll motion into consideration. This paper proposes a control algorithm to follow a curved road while simultaneously preventing rollover. Model predictive control is applied to minimize roll motion throughout cornering. The prediction of vehicle state is based on a four-wheel nonlinear vehicle model with roll dynamics and...
The paper present the gripping mechanism, which is analyzed in terms of kinematic and dynamic. Functionally calculation is presenting the gripping mechanism. Also nonlinear dynamical modeling are presented for gripping of objects with different geometries. They presented several variant of the containment mechanism grip.
The aim of this paper is to design a torque sensorless controller for a human-electric hybrid bicycle. The human input torque is estimated using the disturbance observer to design the controller for electric motor to assist the cyclist based on the requirement. The closed loop stability is ensured for various assist condition as per the standard. Simulation results are presented to validate the proposed...
The mechatronic system with variable parameters operating under varying conditions discussed in this paper refers to an electric drive system for winding a strip with constant linear velocity on a drum. The continuously variation of the plant inputs, namely reference and load disturbance, is determined by the increasing radius and hence moment of inertia of the drum. This paper suggests a conventional...
In this paper, we propose a novel approach to control autonomous robots to achieve a desired linear formation during movement towards the target position. Firstly, one robot, which has the closest distance to the target, is selected as the leader of the swarm. The desired formation is built based on the relative position between this leader and the target. Secondly, the trajectory of the remaining...
Data analysis of an oscillating flapping wing is conducted for developing a transfer function model especially for heave force data series from the CFD environment for different geometries of flapping wings. The wing experiences a combination of vertical and angular oscillatory motion, while travelling at constant forward speed. The vertical motion is induced by the random motion of the ship in waves,...
The simulation approach for assessment of adaptive algorithms based on stochastic search is described in this paper. In this research, the adaptive algorithms are used for railway safety system to improve existing braking by automatic smooth and precise braking of a train, avoiding passing the restrictive signal and prevent crashes. Simulation results are grouped for different types of trains to test...
The piezoelectric actuator is a voltage spring system that behaves in similar characteristic to mechanical mass spring system. It converts electrical signal to physical displacement. The displacements profile of the piezoelectric actuator shifts due to hysteresis and creep during actuation. Numerous equations were used to describe model of actuator in the past. In this work, we presented the behaviour...
The paper deals with the problem of controlling the impact between a mechanical system, having n degrees of freedom, and a body possibly subject to elastic/plastic. deformations. Goal of the proposed control scheme is the regulation of the impact force to a desired vaine, while imposing a prescribed configuration to the system, even in presence of possible plastic deformations of the body. The behaviour...
We investigate how unmanned aerial vehicles (UAVs) with flexible wings can be designed to exploit the aeroelasticity of wing deformation that is present in bat wings, with a view to improve the efficiency of flight. We constructed a robotic bat wing with fully passive elastic wing-folding properties. The robotic wing is powered by a gearbox running two synchronised motors, effectively providing one...
A recent study identified six mutations (three gain-of-function and three loss-of-function mutations) in the KCNA5 channel (encoding for the ultra-rapid delayed rectifier potassium current, IKur) associated with lone-atrial-fibrillation. However, the impact of the mutations on atrial electro-mechanical functions is unclear. In this study, we developed a coupled electro-mechanical model of the human...
Much has been written on how the increase of connectivity through the internet and other media has facilitated successful changes in government such as the Arab Spring. However, regime change, even when essentially peaceful, occurs in a dynamically complex environment that renders often counterintuitive results. For example, when a government falls to an insurgency (peaceful or otherwise), the establishment...
We have developed the robotic vehicle on water that moves by the rider's balance. Previously, due to the lack of stability of the vehicle, balancing skill was required for the rider. In general, the center of buoyancy of the floating body influences on the stability. Therefore, in this paper, the floating vehicle was modeled and the appropriate body shape and size that improves the stability was simulated...
This article proposes a new design of a 3D unfolded/tightened mechanism based on the spine structure of golden tree snake, which can realize torsion and bending. Inspired by golden tree snake vertebrae space deformation characteristics, analyzing the anatomy characteristics of the golden tree snake spine bone and muscle distribution characteristics, The bionic mechanism and drive unit can drive the...
This paper presents the design of balance control for an inverted pendulum system. The system consists of a cart, linear motor and a pole. The pole is pivoted on the cart where the cart is actuated by a linear motor. The control objective is to stabilize the pole at its upright position. The second-order sliding mode control is used to design the stabilizing control law for the system. For comparison,...
Polymetallic sulfide particle hydraulic lifting process was simulated with theoretical analysis and numerical calculation. Simulation goal was to obtain polymetallic sulfide particle hydraulic lifting conditions in vertical pipe and action rules between hydraulic lifting system parameters and hydraulic lifting performance. Mechanics analysis model of polymetallic sulfide particle hydraulic lifting...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.