Pendulum-type nutation damper used in the nasa atmospheric structure satellite, s-6
Passive device for damping nutational motion of spin stabilized Explorer XVII satellite
NUTATIONAL OSCILLATION↗
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Results for “DAMPER”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Application of Rice/Wilberforce gravity-gradient damper to NASA lenticular communication satellite
Dynamic characteristics of gravity gradient stabilization and damping system
DAMPING↗
Conceptual Design Study for a Mars Entry Vehicle Damper
Design criteria of passive damping system for Mars entry vehicle - damping of angle of attack oscillation during entry trajectory
MARS PROBE↗
Two-damper passive gravity-gradient stabilization system
Design study of symmetrical, vertistat, passive gravity gradient stabilization system for communications satellites
STABILIZATION↗
Concept for design of variable stiffness damper
Damping mechanism, containing polymeric-like materials is applicable to a wide range of shock and vibration. The polymeric-like material changes from a relatively stiff material to a relatively soft, rubbery material in the region of their glass transition temperatures. The energy absorption characteristics and stiffness are controllable with temperature.
Lohr, J. J.↗
Viscous damper
Damping device exhibiting no hysteresis effect and capable of preload is used in place of a preload spring in an aneroid bellows to provide viscous damping. It operates about the action of a pressure sensing outer bellows attached to an active header above and a static header below.
Dean, W. C.↗
Sleeved damper limits spring surging
Damping device limits spring surging in delicate instrumentation subjected to shock loading to tolerable limits. The device consists of a spiral formed plastic member interleaved between the spring coils in the same helix configuration.
Dean, W. C.↗
Hanging-chain impact dampers - A simple method for damping tall flexible structures
Oscillation damping of tall structures by hanging chains
Reed, W. H., III↗
Development of gravity-gradient dampers
Suspension and energy dissipation couplings in satellity gravity gradient stabilization system
Johnson, M. E.↗
Variable stiffness polymeric damper
Shock and vibration damping device using temperature sensitive solid amorphous polymers
Lohr, J. J.↗
Dynamic precession damper for spin stabilized vehicles Patent
Dynamic precession damping of spin-stabilized vehicles by using rate gyroscope and angular accelerometer
Garner, H. D.↗
Turbo-machine blade vibration damper Patent
Blade vibration damping pins for turbomachinery
Hanson, M. P.↗
Nutation-damper design for dual-spin spacecraft
A dual-spin spacecraft is a spin-stabilized spacecraft consisting of two major structures. Momentum is stored in the spinning wheel, while the sail, or platform, can be despun at various rates about the spacecraft axis. Factors that affect the design of nutation-control systems for single- and dual-spin spacecraft are discussed. The nutation-control system of the Orbiting Solar Observatory spacecraft is described.
Spencer, T. M.↗
Experimental verification of the energy dissipation mechanism in acoustic dampers.
An experimental program is described which verifies the theoretical model that acoustic damping devices undergoing high intensity oscillations dissipate energy via jet kinetic losses. Pressure measurements within the damping devices and flow duct together with detailed surveys of the jet velocities provide the experimental confirmation. The theory accounts for duct flow effects, both steady and unsteady, as well as the jet dissipation. Discrepancies between theory and experiment can be traced to neglect of higher order terms or ignoring the difficult wall friction term in the case of the quarter-wave tube.
Tang, P. K.↗
Synthesis of vibration dampers
A method which uses a mathematical accelerometer is proposed for determining the 3rd derivative of the displacement in shock absorbers.
Kamayev, V. A.↗
Fluid-film bearing damper
Device for rotating machinery has noncircular support that allows changes in dynamic properties. Device can be controlled for either manually or automatically altering its stiffness and damping properties without interruption of operation.
Cunningham, R. E.↗
The design of hydraulic pressure regulators that are stable without the use of sensing line restrictors or frictional dampers
Parameters controlled in design determine the stability of hydraulic pressure regulators in service. The non-linear sensing line restrictor can provide stability, but degrades the transient response. Linear damping is not always physically realizable and is sensitive to clearance and viscosity. Design relationships are analytically derived through which regulators can be made to be stable without the use of either of these damping means. The analytical distinctions between the parameters derived and those in prior literature are discussed. An analytically derived circuit component that stabilizes an otherwise unstable regulator and its experimental verification is described.
Gold, H.↗
A pressurized gas squeeze film journal damper
A lumped parameter model is developed to determine the stiffness and damping characteristics of inherently compensated gas film bearings. The model relies on the average static pressure over a one dimensional strip bearing. Results of the model are compared with known computer solutions for the distributed strip and a two dimensional square bearing. The results for the stiffness agree well with the computer solutions although the model proved to be inadequate for predicting the film damping.
Stiffler, A. K.↗