Statement of Work
1.0 Introduction
1.1 This Statement of Work describes the requirements for “Design and Fabrication of
calibration accessories and calibration of KARI wind tunnel balances”.
2.0
KARI wind tunnel balances
The Supplier shall provide calibration reports and calibration accessories for 3 KARI balances.
2.1 Balance Configurations
ID
Diameter
Normal
Force
Pitching
Moment
Side
Force
Yawing
Moment
Rolling
Moment
Axial
Force
Inches
Lbs
In-Lbs
Lbs
In-Lbs
In-Lbs
Lbs
IB6-017
2.0
1000
4000
500
2500
2500
250
IB6-018
2.0
2000
6000
1000
3000
2500
250
IB6-019
1.25
800
2000
400
1100
600
125
IB6-017
IB6-018
IB6-019
IB6-017 has 7 full bridges, 6-component forces and moments and one additional axial force.
IB6-018 has 8 full bridges, 6-component forces and moments and two additional axial force.
IB6-019 has 6 full bridges, 6-component forces and moments.
3.0
Balance Calibration
3.1 Calibration loading schedule
Primary load for each axis and two-combined load will be applied to the balance. Maximum
loading points for each balances will be about 3200 points. Details about the loading points will
be decided with supplier’s suggestion. KARI’s suggestion is attached as a appendix.
3.1.1 Primary loading : Primary load for each components will be applied to the balance with
more than 5 steps from zero to a full load condition.
3.1.2 Combined loading ; Two-combined load for all components will be applied to the balance
to achieve the 6x97 calibration matrix.
3.1.3 The balance shall be designed so that failure (other than a taper failure) during a test does
not result in the model separating from the sting.
3.1.4 The recommended excitation voltage is 5V.
3.2 Calibration accessories
Supplier shall design and fabricate all accessories including the calibration body, balance
holders and free end adapter for all three balances. Taper gages will be provide to Supplier by
KARI.
4.0 Schedule
All calibration shall be finished within 8 months after contraction.
5.0 Deliverables
Shipment and insurance for both side is responsibility of KARI.
A. Return 3 balances and taper gages.
B. Calibration report with electric file
The test results from all loadings shall be included, as well as the deflection data.
The constants, equations and standard deviations will also be included.
C. Calibration accessories
Calibration Accessories made by this project
Electric drawing file for calibration accessories
6.0 Qualification of Supplier
Supplier shall be able to calibrate the KARI wind tunnel balances by designing and fabricate all
accessories including the calibration body, balance holders and free end adapter described in
this Statement of Work.
Supplier shall provide the evidence of the appropriate equipment and facility for calibration of
the wind tunnel balances described in the Statement of Work.
Appendix 1 : Loading schedule (KARI’s suggestion)
Loading scheme
V1 = {0,-50,-100,-75,-50,-40,-20,-10, 0, 10, 20, 40, 50, 75, 100, 60, 30, 0} % of Maximum load range
V2 = {-100, -75, -60, -45, -30, -15, 15, 30, 45, 60, 75, 100} % of Maximum load range
* Load Rhombus should be applied on {Fy1 + Fy2} and {Fz1 + Fz2} loads
Appendix 2 : Reference drawing
IB6-017 Taper drawing
IB6-018 Taper drawing
IB6-019 Taper drawing
Example of Calibration accessories