Whole-spacecraft vibration isolation on small launch vehicles

2000 ◽  
Author(s):  
Paul S. Wilke ◽  
Conor D. Johnson ◽  
Patrick J. Grosserode ◽  
Dino Sciulli
Keyword(s):  
Vibration Isolation ◽  
Launch Vehicles

Whole-Spacecraft Vibration Isolation on Small Launch Vehicles

2000 ◽  
Author(s):  
Paul S. Wilke ◽  
Conor D. Johnson ◽  
Patrick J. Grosserode ◽  
Dino Sciulli
Keyword(s):  
Vibration Isolation ◽  
Launch Vehicles

Multi-axis whole-spacecraft vibration isolation for small launch vehicles

2001 ◽  
Author(s):  
Conor D. Johnson ◽  
Paul S. Wilke ◽  
Kenneth R. Darling
Keyword(s):  
Vibration Isolation ◽  
Launch Vehicles

Overview of Payload Vibration Isolation Systems

2005 ◽  
Author(s):  
Dumitru I. Caruntu ◽  
Christopher Shove
Keyword(s):  
Vibration Isolation ◽  
Vibration Reduction ◽  
Launch Vehicles ◽  
Random Vibrations ◽  
Passive Systems ◽  
Entire Family ◽  
Acoustic Environment ◽  
Reusable Launch Vehicles ◽  
Black Brant ◽  
Isolation Systems

This paper is an overview of recent spacecraft payload vibration isolation systems for further possible application to reusable launch vehicles sub-orbital missions. A summary of vibro-acoustic environment of Orbital Science and Kistler Aerospace’s small launch vehicles indicated a severe level of random vibrations, shock and acoustics that the payload must endure. The same level of random vibrations has been found for an entire family of sounding rockets: Black Brant, Orion, Nike-Orion, Taurus-Orion and Terrier-Orion. This paper also presents recent flight experiments designed to test either launch isolation or on-orbit isolation systems. While the on-orbit vibration isolation systems were active-passive systems, which lately used smart structures and new control algorithms including adaptive neural network-based, launch isolation systems evolved from passive to active-passive systems which were lately tested during the VALPE-2 experiment. Launch active-passive systems provided a vibration reduction 10 to 1 versus up to 5 to 1 provided by passive systems. Also, on-orbit active-passive systems provided a vibration reduction of about 10 to 1. Suborbital missions became very important due to the growing number of research projects dedicated to remote sensing of high resolution and effects of microgravity. The number of orbital and especially suborbital reusable launch missions is estimated to increase considerably in the near future as vehicles develop. The actual tendency is to reduce payload weight and mission costs, and to improve the payload environment. This requires more efficient vibration isolation systems that will guarantee payload safety and better operational performance for reusable launch vehicles.

Semi-Active Vibration Isolation System for Launch Vehicles

2004 ◽  
Vol 37 (6) ◽  
pp. 991-996
Author(s):  
Kousuke Iwamoto ◽  
Keiichiro Noda ◽  
Toshiyuki Suzuki ◽  
Yuji Koike ◽  
Hiromu Takahashi ◽  
...  
Keyword(s):  
Vibration Isolation ◽  
Launch Vehicles ◽  
Isolation System ◽  
Vibration Isolation System ◽  
Active Vibration ◽  
Active Vibration Isolation

Comparison of TEM and STM observations of small silver clusters on different carbon supports

1990 ◽  
Vol 48 (4) ◽  
pp. 264-265
Author(s):  
Bernd Tesche ◽  
Tobias Schilling
Keyword(s):  
Vibration Isolation ◽  
Pyrolytic Graphite ◽  
Carbon Film ◽  
Silver Clusters ◽  
Carbon Supports ◽  
Stacking Order ◽  
System P ◽  
High Resolution Tem ◽  
High Degree ◽  
Degree Of Order

The objective of our work is to determine:a) whether both of the imaging methods (TEM, STM) yield comparable data andb) which method is better suited for a reliable structure analysis of microclusters smaller than 1.5 nm, where a deviation of the bulk structure is expected.The silver was evaporated in a bell-jar system (p 10−5 pa) and deposited onto a 6 nm thick amorphous carbon film and a freshly cleaved highly oriented pyrolytic graphite (HOPG).The average deposited Ag thickness is 0.1 nm, controlled by a quartz crystal microbalance at a deposition rate of 0.02 nm/sec. The high resolution TEM investigations (100 kV) were executed by a hollow-cone illumination (HCI). For the STM investigations a commercial STM was used. With special vibration isolation we achieved a resolution of 0.06 nm (inserted diffraction image in Fig. 1c). The carbon film shows the remarkable reduction in noise by using HCI (Fig. 1a). The HOPG substrate (Fig. 1b), cleaved in sheets thinner than 30 nm for the TEM investigations, shows the typical arrangement of a nearly perfect stacking order and varying degrees of rotational disorder (i.e. artificial single crystals). The STM image (Fig. 1c) demonstrates the high degree of order in HOPG with atomic resolution.

Vibration isolation of power tool operators

1983 ◽  
Author(s):  
C. W. Suggs ◽  
C. F. Abrams
Keyword(s):  
Vibration Isolation

An hourglass-type electromagnetic isolator with negative resistance electromagnetic shunt circuit

2020 ◽  
Vol 64 (1-4) ◽  
pp. 549-556
Author(s):  
Yajun Luo ◽  
Linwei Ji ◽  
Yahong Zhang ◽  
Minglong Xu ◽  
Xinong Zhang
Keyword(s):  
Vibration Isolation ◽  
Electromechanical Coupling ◽  
Coupling Effect ◽  
Negative Resistance ◽  
Isolation System ◽  
Amplitude Vibration ◽  
Vibration Responses ◽  
The Stability ◽  
Isolation Performance ◽  
Shunt Circuit

The present work proposed an hourglass-type electromagnetic isolator with negative resistance (NR) shunt circuit to achieve the effective suppression of the micro-amplitude vibration response in various advanced instruments and equipment. By innovatively design of combining the displacement amplifier and the NR electromagnetic shunt circuit, the current new type of vibration isolator not only can effectively solve the problem of micro-amplitude vibration control, but also has significant electromechanical coupling effect, to obtain excellent vibration isolation performance. The design of the isolator and motion relationship is presented firstly. The electromechanical coupling dynamic model of the isolator is also given. Moreover, the optimal design of the NR electromagnetic shunt circuit and the stability analysis of the vibration isolation system are carried out. Finally, the simulation results about the transfer function and vibration responses demonstrated that the isolator has a significant isolation performance.

Theoretical evaluation of the amplitudes of pogo vibrations in liquid propellant launch vehicles

1999 ◽  
Vol 5 (1) ◽  
pp. 90-96 ◽  
Author(s):  
V.V. Pilipenko ◽  
◽  
N.I. Dovgot'ko ◽  
S.I. Dolgopolov ◽  
A.D. Nikolaev ◽  
...  
Keyword(s):  
Launch Vehicles ◽  
Liquid Propellant ◽  
Theoretical Evaluation
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