Definition measurement unit with flexure hinges for a wind tunnel balance

Abstract

A definition measurement unit with flexure hinges, which will usually be applied as the main focus was directed on the measurement of definite forces, has been design for a wind tunnel balance. The character of various notch type flexure hinges was analysed in this paper, and two pairs of symmetric circular flexure hinges at 90 degrees was selected for a definition measurement unit. According to the definition measurement unit flexure hinge's arrangement for the performance and the mechanics characters of various boundary constraint conditions, conclude that the definition measurement unit with side surface slide constraints and uniform offset arrangement have good performance for eliminating non-axis direction load interference to measurement of axis direction force, and then measure the axis force efficiently, and then meet the demand of high load measure precision of model in wind tunnel balance .

Flexible Rod Design for Educational Wind Balance

“…The number of feasible designs and applications is very large. Wang 11 reported the design of several flexible hinges where the behavior of different crosssectional designs was analyzed. Zhu and Zhang 18 present the use of a monolithic flexure frame as a design strategy to reduce the total number of mechanical components.…”

“…The limit condition to decide when expression (10) should be applied is obtained by solving the system formed by expressions (8) and (11). For S r ≈ 20, Eq.…”

“…A compromise decision must be made between the axial load capacity and the flexibility needed with negligible reaction forces. 11 In this case there is a risk of buckling. If the strut rod is overloaded, further recalibration of the balance is required due to the permanent deformation suffered by the flexure.…”

“…Milling machined flexures with two perpendicular planes have been documented. 5,11 The flexure sections are tuned according to the anticipated aerodynamic strength range. A compromise decision must be made between the axial load capacity and the flexibility needed with negligible reaction forces.…”

A study on the dynamic six-component force measurement with wind loads

“…3 And there has been considerable research on the combination of modeling and analysis techniques applied on strain gage wind tunnel balance. Smith et al, 4 Wang et al 5 and Richard and Norbert 6 showed the simulation of balance performance based on aerodynamic loads and mechanical responses. Published test results in Steinle 7 and Kammeyer and Rueger 8 are some of the most extensive literatures regarding common occurrences with strain gage balances, modeling the phenomenon as viscous elastic and temperature effects, which may significantly complicate the analysis.…”