Dynamic calibration of magnetic suspension and balance system for sting-free measurement in wind tunnel tests

To avoid flow disturbance generated by mechanical supports around a model and to guarantee flow quality, a magnetic suspension and balance system (MSBS) can be used to measure aerodynamic forces and moments during wind tunnel tests. We present a dynamic method for the efficient multiple degree of freedom calibration of an MSBS. The MSBS has linear characteristics that allow it to be used as a non-contact-type balance. Moreover, the MSBS can measure multi-component external forces at the same time. The calibration results were used to measure the aerodynamic forces and moments acting on a finite wing model over various angles of attack during wind tunnel tests, allowing the aerodynamic coefficients of the finite wing model to be successfully obtained without support interference.

[1]  R. Ramesh.  Thin flat balances for testing thin delta wings at hypersonic speeds , 2001 .

[2]  Bernd F. R. Ewald,et al.  REVIEW ARTICLE: Multi-component force balances for conventional and cryogenic wind tunnels , 2000 .

[3]  Junseong Lee,et al.  Development of a Simulator of a Magnetic Suspension and Balance System , 2010 .

[4]  Charles E. Tinney,et al.  Axial flow over a blunt circular cylinder with and without shear layer reattachment , 2006 .

[5]  E.E. Covert.  Magnetic suspension and balance systems , 1988, IEEE Aerospace and Electronic Systems Magazine.

[6]  E. Covert,et al.  Sting-free measurements of sphere drag in laminar flow , 1972, Journal of Fluid Mechanics.

[7]  David A. Dress.  Drag measurements on a modified prolate spheroid using a magnetic suspension and balance system , 1990 .

[8]  Arnold M. Kuethe,et al.  Foundations of Aerodynamics , 1959 .

[9]  W. Asrar,et al.  Evolution of NACA23012 Wake Vortices Structure Using PIV , 2012 .

[10]  Eastman N. Jacobs,et al.  Airfoil section characteristics as affected by variations of the Reynolds number , 1939 .

[11]  Hiroshi Higuchi,et al.  Sting-free measurements on a magnetically supported right circular cylinder aligned with the free stream , 2008, Journal of Fluid Mechanics.

[12]  Frederick J. Milford,et al.  Foundations of Electromagnetic Theory , 1961 .

[13]  Junseong Lee,et al.  System Identification and Controller Design of a Micro Air Vehicle using Magnetic Suspension and Balance System , 2011 .

[14]  H. Sawada,et al.  STATUS OF MSBS STUDY AT NAL , 1994 .