1998 Fiscal Year Final Research Report Summary
Coupled Thermoelastic Response and Its Stability of Flexible Solar Array Subjected to Radiation Heating
| Project/Area Number |
09651009
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
Aerospace engineering
|
|---|
| Research Institution | KYUSHU UNIVERSITY |
|---|
Principal Investigator |
MUROZONO Masahiko Faculty of Engineering, KYUSHU UNIVERSITY Associate Professor, 工学部, 助教授 (10190943)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
SHINMOTO Yasuhisa Faculty of Engineering, KYUSHU UNIVERSITY Research Associate, 工学部, 助手 (30226352)
|
|---|
| Project Period (FY) |
1997 – 1998
|
| Keywords | Solar array / Artificial satellite / Thermoelasticity / Flexible space structure / Radiation heating / Buckling / Natural vibration / Thermal deformation |
|---|
| Research Abstract |
Theoretical analyses of the buckling characteristics, the natural vibration characteristics, the quasistatic thermal-structural responses, and the dynamic thermal-structural responses of an asymmetric flexible rolled-up solar array were presented. The analyses were based on a generalized flexible rolled-up solar array model assuming asymmetric loading conditions because of geometric asymmetry. Numerical calculations were conducted using the data for the solar arrays of the Hubble Space Telescope. The buckling analysis established the possible critical buckling forces and buckling modes and showed that, for the HST solar array, buckling will occur in torsion. The lowest buckling force was slightly larger than the typical design value of the solar array.Calculated results also suggests that the torsional buckling force rose and the bending buckling force fell because of the bending-torsion coupling effects. The vibration analysis made clear that the natural frequencies and the mode shape
… More
s depended considerably on the average compressive axial force of the BiSTEMs. Calculated results if the axial force took the design value for the solar array showed that the first mode was dominated by the torsional deformation of the whole solar array, the second mode was bending, and the higher modes were dominated by the solar blanket deflection, though all vibration modes were influenced by bending-torsional coupling. Quasistatic structural responses of the solar array subjected to sudden radiation heating such as typical night-day transition in orbit were calculated. The results showed that the structural response depends significantly on the compressive axial force. When the axial force was close to the buckling force, large bending moments occurred at the midpoint of the outer BiSTEM.The result suggests that thermally induced quasistatic torsional deformation may have caused the failure of the solar array BiSTEM.Time histories of the deflections and bending moments of the HST solar array were calculated analytically using modal analysis. Less
|
