Accession Number : ADA248840

Title :   Strain-Gauge Balance Performance and Internal Temperature Gradients Measured in a Cryogenic Environment.

Descriptive Note : Technical memo.,

Corporate Author : DEFENCE RESEARCH AGENCY BEDFORD (UNITED KINGDOM) AEROSPACE DIV

Personal Author(s) : Law, R. D.

Report Date : JAN 1992

Pagination or Media Count : 36

Abstract : Tests are described in which strain gauged and a simple axisymmetric dummy balance were subjected to temperature gradients. An external body of revolution was fitted over each to provide shielding from gas flows of 16 m/s at temperatures between ambient and 90 K. Convection around the balances could be controlled, and by extending the body of revolution the direction of temperature gradients was changed. A simple beam analysis is used to demonstrate that thermally induced axial force readings from the balance can be predicted from temperatures measured at the flexure roots. An axial force calibration was carried out on the at ambient and cryogenic temperatures to quantify sensitivity changes. To measure changes in interactions at low temperatures pitching moment or normal force were also applied simultaneously with axial force. Cryogenic, Wind tunnels, ETW, Cryogenic balances.

Descriptors :   *BALANCES, *STRAIN GAGES, AXISYMMETRIC, CALIBRATION, CONVECTION, CRYOGENICS, EXTERNAL, GRADIENTS, INTERACTIONS, MOMENTS, SENSITIVITY, SHIELDING, TEMPERATURE GRADIENTS, WIND TUNNELS.

Subject Categories : Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE