Optimization of a Novel Anthropomorphic Three-Jointed Underactuated Finger Mechanism

2013 ◽  
Vol 278-280 ◽  
pp. 647-653
Author(s):  
Hai Dong Luo ◽  
Yi Zhang ◽  
Hua Deng
Keyword(s):  
Numerical Simulation ◽  
Optimization Problem ◽  
Kinematic Characteristic ◽  
Motion Feature ◽  
Numerical Simulation Result ◽  
Coupling Motion ◽  
Human Finger ◽  
Underactuated Finger

A novel underactuated finger mechanism based on linkage and spring elements is proposed. The kinematic characteristic of the mechanism is analyzed to obtain the fingertip displacement and relationships between three joints. Considering the motion feature of human finger and actuation efficiency of the driving motor, the dimensional design of the finger mechanism is formulated as an optimization problem. The numerical simulation result shows that the finger mechanism can not only realize the anthropomorphic coupling motion, but also envelope objects with various shapes and sizes self-adaptively.

Numerical Simulation of Muzzle Flow Field of Gun Based on CFD

2013 ◽  
Vol 291-294 ◽  
pp. 1981-1984
Author(s):  
Zhang Xia Guo ◽  
Yu Tian Pan ◽  
Yong Cun Wang ◽  
Hai Yan Zhang
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Stokes Equation ◽  
Wave Structure ◽  
Flow Fields ◽  
Single Equation ◽  
Navier Stokes ◽  
Turbulent Model ◽  
Navier Stokes Equation ◽  
Numerical Simulation Result

Gunpowder was released in an instant when the pill fly out of the shell during the firing, and then formed a complicated flow fields about the muzzle when the gas expanded sharply. Using the 2 d axisymmetric Navier-Stokes equation combined with single equation turbulent model to conduct the numerical simulation of the process of gunpowder gass evacuating out of the shell without muzzle regardless of the pill’s movement. The numerical simulation result was identical with the experimental. Then simulated the evacuating process of gunpowder gass of an artillery with muzzle brake. The result showed complicated wave structure of the flow fields with the muzzle brake and analysed the influence of muzzle brake to the gass flow field distribution.

The Research of Calculation Method on Vertical Natural Frequency of the New Full-Prefabricated Floor

2016 ◽  
Vol 846 ◽  
pp. 506-511
Author(s):  
Chong Fang Sun ◽  
Shu Ting Liang ◽  
Xiao Jun Zhu
Keyword(s):  
Numerical Simulation ◽  
Natural Frequency ◽  
Calculation Method ◽  
Variable Stiffness ◽  
Series Method ◽  
Numerical Simulation Result ◽  
Stiffness Method ◽  
Calculation Results ◽  
New Type ◽  
Test Result

New-type floor is composed of three kinds of slabs joined together through fittings. It is a kind of anisotropic two-way slab. In order to study the calculation method of natural frequency, series method, variable thickness method and variable stiffness method are adopted to calculate the natural frequency. The calculation results of three methods are compared with test result and numerical simulation result. The conclusion is that the calculation result of the variable stiffness method is the closest to the real natural frequency of new-type floor.

A Semi-Active Controller for an Aircraft Landing Gear Equipped with Magnetorheological Damper

2019 ◽  
Vol 894 ◽  
pp. 29-33
Author(s):  
Luong Quoc Viet ◽  
Jai Hyuk Hwang
Keyword(s):  
Numerical Simulation ◽  
Force Control ◽  
Hybrid Control ◽  
Mr Damper ◽  
Landing Gear ◽  
Operating Conditions ◽  
Magnetorheological Damper ◽  
Numerical Simulation Result ◽  
Aircraft Landing ◽  
Aircraft Landing Gear

The magnetorheological (MR) damper is the newest approach to replace the traditional passive damper which cannot change their dynamics in response to different operating conditions of the aircraft landing gear. This paper presents the simulation study of a semi-active controller for a landing gear equipped MR damper. Furthermore, a new method combined skyhook control with force control, called hybrid control, is developed to improve the performance of the MR damper landing gear. Finally, the numerical simulation result of the landing gear using SIMSCAPE-Simulink is discussed.

scholarly journals Numerical Simulation of Rotor in Hover and Forward Flight

2018 ◽  
Vol 179 ◽  
pp. 03011
Author(s):  
Qinghe Zhao
Keyword(s):  
Experimental Data ◽  
Numerical Simulation ◽  
Flow Field ◽  
Moving Grid ◽  
Steady State Flow ◽  
Forward Flight ◽  
Numerical Simulation Result ◽  
Structured Grid ◽  
Pressure Distributions ◽  
Good Agreement

The flow around rotor is numerical simulated in hover and forward flight based on multi-structured grid. In hover the flow field can be transformed into a steady-state flow field in the rotating coordinate system. The experimental data of Caradonna and Tung rotor is used to verify the numerical simulation result. The numerical results compare well with the experimental data for both non-lifting and lifting cases. Non-lifting forward flight is simulated and the prediction capabilities have been validated through the ONERA two-blade rotor. The pressure distributions of different positions under different azimuth angles are compared, which is in good agreement with the experimental data. There is unsteady shock wave when forward flight. Dual-time method is used to obtain unsteady flow field with rigid moving grid in the inertial system.

The Numerical Simulation of Hemispherical Parts Based on FBDF Technology

2014 ◽  
Vol 490-491 ◽  
pp. 644-648
Author(s):  
Lian Cheng Li ◽  
Ming Zhe Li ◽  
Yuan Ting Li
Keyword(s):  
Numerical Simulation ◽  
Material Parameter ◽  
Elasticity Modulus ◽  
Unit Area ◽  
Element Model ◽  
Material Surface ◽  
Damping Force ◽  
Numerical Simulation Result ◽  
Resistance To Deformation

in this paper, we mainly introduce the principle of the flexible blank drawer forming (FBDF), and establish the limited element model of the FBDF process. Then we make a numerical analysis on the hemispherical parts, and study the effect made on the result of shaping by damping force, friction coefficient as well as material parameter in per unit area. Through the analysis of the numerical simulation result, we can conclude that the greater the yield limit and elasticity modulus, the larger blank drawer force is required to form the shape; the more smooth the material surface, the less resistance to deformation will have. All this contributes to good quality of forming parts.

scholarly journals Robust Observer-Based H∞ Controller Design for Motorcycle Lateral Dynamics

2018 ◽  
Vol 2018 ◽  
pp. 1-11
Author(s):  
A. Ferjani ◽  
I. Zaidi ◽  
M. Chaabane
Keyword(s):  
Numerical Simulation ◽  
Convex Optimization ◽  
Optimization Problem ◽  
Controller Design ◽  
Longitudinal Velocity ◽  
Robust Controller ◽  
Convex Optimization Problem ◽  
Lateral Dynamics ◽  
Robust Observer ◽  
Simulation Results

The present work deals with the design problem of a robust observer-based controller for a motorcycle system using LPV approach. The designed model is specifically uncertain and disturbed one, whose uncertainties are related to variations of both the cornering stiffness and the longitudinal velocity. The nonlinear motorcycle model is firstly transformed on an uncertain LPV model with two vertices; then an observer-based H∞ robust controller is designed. Both the controller and observer gain matrices are computed by solving a unified convex optimization problem under LMI constraints using YALMIP solver. Numerical simulation results are given to illustrate the effectiveness of the designed method.

scholarly journals NUMERICAL SIMULATION OF COUPLING MOTION BETWEEN BLADE AND FLUID FOR THE WATERWHEEL WITH YAWING BLADES

2005 ◽  
Vol 49 ◽  
pp. 841-846
Author(s):  
Ken TAKACHI ◽  
Shinya UMEDA ◽  
Hajime ISHIDA ◽  
Hideaki KAWASAKI
Keyword(s):  
Numerical Simulation ◽  
Coupling Motion

Numerical Simulation on Penetration into Double Plates of Annular Jet

2013 ◽  
Vol 457-458 ◽  
pp. 1523-1526
Author(s):  
Lei Fu ◽  
Wei Li Wang ◽  
Xue Feng Huang ◽  
Ying Zi Jiang ◽  
Zhuang Qing Fan
Keyword(s):  
Numerical Simulation ◽  
Shaped Charge ◽  
Damage Effect ◽  
Kinematic Characteristic ◽  
Jet Formation ◽  
Forming Process ◽  
Annular Jet ◽  
Simulation Results ◽  
Effective Penetration

A new shaped charge annular cutter structure is put forward, and the process of annular jet formation and penetration into double plates is simulated by using ANSYS/LS-DYNA software. The kinematic characteristic of annular jet in the air is analysed. The damage effect on the plates is got. The simulation results show that an intilted phenomenon exists on the forming process of annual jet, and the annular jet is stretched into several annular penetrators after penetrating the upper plate. The annular jet formed by annular cutter shaped charge in the paper can realize effective penetration into double plates, and the results can provide reference for the design of tandem warhead front shaped charge.

Thermal-Mechanical Coupled Numerical Simulation of Heat Pulp Mould

2011 ◽  
Vol 421 ◽  
pp. 9-13
Author(s):  
De Zhi Yang ◽  
Zhao Yao Zhou ◽  
Wen Jiong Cao ◽  
Yi He
Keyword(s):  
Numerical Simulation ◽  
Temperature Distribution ◽  
High Accuracy ◽  
Design Stage ◽  
Mould Temperature ◽  
Mechanical Pressure ◽  
Numerical Simulation Result ◽  
Hot Temperature ◽  
Coupled Effect

3D thermal-mechanical coupled numerical simulation of heat pulp mould was carried out. The numerical simulation result shows the rising up process of mould temperature. Temperature distribution contours shows the temperature status on the mould. Temperature distribution results provide reliable guarantee to change the mould structure, so that the temperature distribution on surface becomes uniform. Displacement contours show the mould deformation under the coupled effect of hot temperature and mechanical pressure. The displacement value of nodes can offer reference size to scale mould at the design stage. As a result, high accuracy mould will be manufactured, and this will improve the passing rare of product.

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