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Thursday, August 6, 2020 | History

2 edition of Vibration characteristics of a deployable controllable-geometry truss boom found in the catalog.

Vibration characteristics of a deployable controllable-geometry truss boom

John T Dorsey

Vibration characteristics of a deployable controllable-geometry truss boom

by John T Dorsey

  • 169 Want to read
  • 3 Currently reading

Published by National Aeronautics and Space Administration, Scientific and Technical Information Branch, For sale by the National Technical Information Service] in Washington, D.C, [Springfield, Va .
Written in English

    Subjects:
  • Cranes, derricks, etc,
  • Space frame structures

  • Edition Notes

    StatementJohn T. Dorsey
    SeriesNASA technical paper -- 2160
    ContributionsUnited States. National Aeronautics and Space Administration. Scientific and Technical Information Branch
    The Physical Object
    Pagination27 p. :
    Number of Pages27
    ID Numbers
    Open LibraryOL14933361M

    Deployable Structures In order to accomplish its mission, a small spacecraft may require an appendage, such as a boom or a surface, that is very large relative to the size of the spacecraft. Such appendages must be packaged in collapsed states during launch and subsequently deployed prior to operation. Behind Vibration Analysis. General Introduction (What IS Vibration) Conventions; Characteristics; Amplitude; Frequency; Phase; Acquiring & Displaying Data; Database Setup; Data Plots; Trend Plots; FFT Plots; Time Domain Plots; Envelope Spectra; Spectrum Interpretation (Troubleshooting Charts) Vibration Analysis Books.

    changes in the dynamic characteristics, such as natural frequencies and mode shapes. The objective of the present investigation was to study the feasibility of vibration-based health monitoring in steel truss bridges. Sets of vibration measurement were conducted at an existing steel truss bridge with lo-cal damages found recently. Flexible boom numerical simulation and vibration characteristics analysis. Hongbin Tang. 1, Wu Ren2 1 College of Automobile and Mechanical Engineering, Changsha University of Science and Technology, Changsha , China; 2 S. chool. of Mechanical and Electrical Engineering, Central South University, Changsha, ,China, Abstract. Truck.

      For revealing the nonlinear behavior of the rigid-flexible-thermal coupled system, the observed thermally induced vibration and perturbation on the pointing accuracy of the spacecraft are given in the results, and the feasibility of the presented method is proved. Beginning Vibration Analysis Connection Technology Center, Inc. Rae Boulevard Victor, New York


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Vibration characteristics of a deployable controllable-geometry truss boom by John T Dorsey Download PDF EPUB FB2

Vibration Characteristics of a Deployable. Controllable-Geometry Truss Boom John T. Dorsey Langley Research Center Hampton, Virginia. SUMMARY An analytical study was made to evaluate changes in the fundamental frequency of a two-dimensional cantilevered truss boom at.

Vibration characteristics of a deployable controllable-geometry truss boom. Washington, D.C.: National Aeronautics and Space Administration, Scientific and Technical Information Branch ; [Springfield, Va.: For sale by the National Technical Information Service], (OCoLC) Vibration characteristics of a deployable controllable-geometry truss boom The truss could be axially deployed or retracted and undergo a variety of controlled geometry changes by shortening or lengthening the telescoping diagonal members in each bay.

Both untapered and tapered versions of the truss boom were modeled and analyzed by using Author: J. Dorsey. The deployable boom is a typical example. vibration of the truss in a dynamic launching environment might cause structural root fatigue. For improving the stiffness of the TLD truss, a gusseted base and an auxiliary support frame has been designed.

The truss’s characteristics, including geometry, appearance, connection, resistance Author: Fengfeng Li, Liwu Liu, Linzhe Du, Yanju Liu, Jinsong Leng. Publisher: Washington, D.C.: National Aeronautics and Space Administration, Scientific and Technical Information Branch ; [Springfield, Va.: For sale by the Author: Marvin D.

Rhodes and Martin M. Mikulas. American Institute of Aeronautics and Astronautics Sunrise Valley Drive, Suite Reston, VA Recent trends in underwater vehicle design suggest the use of trusslike structures to support vibrating machinery.

Experimental measurements are used to understand the dynamic behavior of a set of model, three-dimensional truss structures over the full scale equivalent frequency range 10– Hz.

A cubic truss with all equal struts, a rectangular truss with two strut sizes, and a less. The frequency analysis of the circular truss antenna is an important problem for understanding its vibration mechanism. In this paper, we investigate the frequency characteristics of a beam–ring structure which is proposed for the first time to model the circular truss antenna in the case of the antenna expended and locked.

Longitudinal vibration of a truss bar Let us now apply the local right-handed coordinate system (x;z) to the truss element shown in Fig. 2 [14, p. Here, sign convention 2 [5, p. 18] is used for the directions of displacements and forces.

The transfer equations for longitudinal vibration of a truss bar (cf. axial vibration of a bar. Truss Booms (adjustable available) are designed for many uses of placing loads such as trees (often called a Loader Boom), positioning rafters, placing items in truck boxes, etc., allowing an operator to place items with accuracy.

Zhou et al., Dynamic performance characteristics of pre-stressed cable RC truss floor system under human-induced loads, Int.

Struct. Stab. Dyn. 17 (4) () Link, ISI, Google Scholar; X. Zhou et al., Vibration behavior of prestressed cable reinforced concrete truss system caused by jumping and hopping, J. Perform. Construct. Dynamic characteristics of planar linear array deployable structure based on scissor-like element with differently located revolute clearance joints 22 May | Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, Vol.

No. Due to the support conditions of the circular truss antenna, it is observed that there exist four basic vibration types of the deployable ring-truss antenna after they are deployed in the space environment, namely, there exist the radial breathing vibration, the torsional vibration, the bending vibration and the rolling vibration around the support beam at one end.

Li () presented the dynamic analysis model and vibration characteristics of a hoop-truss deployable antenna. Zhao and Guan () built a dynamic model of a circular-truss deployable.

Dynamic model of the large space deployable truss type mast is established. The first several natural frequencies, the vibration model shapes and the corresponding distribution of the longerons model strain energy are given based on the analysis of the modes of the truss type mast. Use the distribution of the longerons' model strain energy as an interpretational criterion to optimize actuator.

Warnaar, D. B., and Chew, M. (March 1, ). "Kinematic Synthesis of Deployable-Foldable Truss Structures Using Graph Theory, Part 2: Generation of Deployable Truss Module Design Concepts.". The primary novelty is the double-ring deployable truss, which is found to significantly enhance the stiffness of the entire antenna over single-ring systems with relatively low mass gain.

Active vibration control of large flexible space structure is a challenging topic in the system dynamics and control of spacecraft.

This paper proposes a novel approach for vibration control on a large hoop truss structure, typically used as mesh satellite antenna. Human-induced vibration has become a serious serviceability problem due to the larger opening of girder, lighter floor systems and longer spans designed and used in practice.

Vibration tests were undertaken in laboratory to research the vibrational characteristics of the arch pre-stressed concrete truss (APT) system spanning m. Results from ambient vibration, impulse excitations (heel. The NPS space truss is a meter long truss that simulates a space-borne appendage with sensitive equipment at its extremities.

With the use of a dSPACE data acquisition and processing system, quartz force transducer and piezoelectric actuator, active controls using an integral plus double integral control law were used to damp out the.

This is the most basic form of vibration monitoring. Calculation of Frequency Spectra. The right column of the Basic Processes diagram shows that the time waveform can be converted to a frequency spectrum in order to show the analyst where the vibration energy is coming from.

Frequency analysis is the essence of vibration analysis and. Depending on the intensity of each footstep, two different frequencies may be created: A low frequency vibration from the truss deflecting under the weight and if the step is “sharp” enough a higher frequency will be generated by the impact between the person’s foot and the floor.Examples of practical vibration problems.

Vibration is a continuous cyclic motion of a structure or a component. Generally, engineers try to avoid vibrations, because vibrations have a number of unpleasant effects: • Cyclic motion implies cyclic forces. Cyclic forces are very damaging to materials.