Flutter analysis of a two-degree-of-freedom MBB A-3 supercritical airfoil in two-dimensional transonic flow

1980 ◽  
Author(s):  
T. YANG ◽  
A. STRIZ ◽  
P. GURUSWAMY
Keyword(s):  
Transonic Flow ◽  
Degree Of Freedom ◽  
Two Dimensional ◽  
Supercritical Airfoil ◽  
Flutter Analysis ◽  
Two Degree Of Freedom

Hydrodynamics Loads on Two Degree-of-Freedom Cylinder With Uncertain Natural Frequencies Subject to VIV

2009 ◽  
Author(s):  
Didier Lucor
Keyword(s):  
Natural Frequencies ◽  
Numerical Study ◽  
Spectral Element ◽  
Numerical Approach ◽  
Response Surfaces ◽  
Degree Of Freedom ◽  
Two Dimensional ◽  
Wide Range ◽  
Two Dimensional Flow ◽  
Two Degree Of Freedom

In this numerical study, we build response surfaces of two degree-of-freedom vortex-induced vibrations (VIV) of flexibly mounted cylinders for a wide range of transverse and in-line natural frequencies. We consider both the structure and the flow to be two-dimensional and the structure has a low mass damping. The emphasis is put on the representation of the hydrodynamic loads acting on the cylinder in response to the change in the natural frequencies of the structure. The system is sampled for a wide range of natural frequencies within the synchronization region, totaling 149 two-dimensional flow-structure simulations. The parametric range of the in-line frequency is chosen to be larger than the one of the transverse frequency in order to favor multi-modal responses. No preferred frequencies are emphasized within the intervals of study. The fully spectral numerical approach relies on a stochastic collocation method coupled to a spectral element-based deterministic solver.

Flutter Analysis of MBB A-3 Supercritical Airfoil in Small Disturbance Transonic Flow

1981 ◽  
Vol 18 (10) ◽  
pp. 887-890
Author(s):  
T. Y. Yang ◽  
A. G. Striz ◽  
P. Guruswamy
Keyword(s):  
Transonic Flow ◽  
Small Disturbance ◽  
Supercritical Airfoil ◽  
Flutter Analysis

Touch Recognition Using a Passive Large Compliance Robotic Finger With Internal Sensors for Planar Applications

1999 ◽  
Author(s):  
Dennis W. Hong ◽  
Raymond J. Cipra
Keyword(s):  
Deflection Angle ◽  
Low Cost ◽  
Three Dimensional ◽  
Outer Edge ◽  
Degree Of Freedom ◽  
Two Dimensional ◽  
Outline Shape ◽  
Contact Points ◽  
Manipulator Arm ◽  
Two Degree Of Freedom

Abstract In this paper, a touch-sensing device consisting of a passive large compliance robotic finger with internal sensors, and algorithms for using this device for recognition applications are presented. These algorithms include recognition of the two-dimensional projected outline shape and dimensions of an object, and recognition of the three-dimensional convex outline height profiles of an object. The two-dimensional outline of an object is identified by tracing the object’s outer edge with the robotic finger and returning the XY coordinates of selected outline contact points and their tangent line directions. Recognition of the three-dimensional convex outline height profiles of an object is done by observing the change of the robotic finger deflection angle while moving the finger toward the object in contact. The feasibility of the device and the algorithms developed were successfully tested for planar applications by both analytical simulations and by experiments using a simple two-degree-of-freedom inverted joystick attached to the end of a planar manipulator arm. Simplicity, low cost, and easy implementation are some of the major benefits of using the proposed touch-sensing device.

Sign in / Sign up

Export Citation Format

Share Document