6926475959

wavegu«de, which may be • selected sUe metal rod in which aooustic waves ara to ba dam pad, is wrapped.or surrounded, by a mass of atainlen Steel wool. The wool wrapped portton is then andwkrhed batween tuning piat et, which may alto be sta in less Steel, by means of eta mp Ing acrews which may be adjusted to change the clamping force of the sandwiched asaambly along tha waveguide saction.

84-1641

Anałysis of Limit Cyde OacHlationa in a Msptetk Suspension System Uaing the Deacribing Function Method

L.O. Kehinde

Univ. of Ife, lle-lfe, Nigeria, Intl. J. Engrg. Sci., 22 (4), pp 419-437 (1984) 14figs,5refs

Kay Words: Magnetic su*>ension technkjuei

This paper presents an analysis of limit cycle oscillations obsaryed in a magnetic tuspension system which utilizes an optical transducer. Stability conditions for certain non-linaarities ara obtained using the deserbing function ep-proach and theea conditions ara tatar verif ied by the stability critarion of Gełb and Van der Ve!de in the saturation non-linaarrty.

84-1643

Auto and Truck Suspension Systems. June, 1970 • November 1983 (Citations from the Enfineering lndex Data Baee)

NTIS. Springfield, VA, 175 pp (Nov 1983) PB84-853274

Key Words: Suspension systems (vehicles). Automobiles. Trucks. Bibltogrephies, Fatigue life

This bibiiography contains 282 citations concerning the effect of sun>enston systems on the performance of motor vehicles. Topics include shock absorber*, steering stability, and load leveling, as wali as the characteristics of both lesf and coil spring*. Materials consideratton* such as fatigue and weer ara also discusted.

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84-1642

Semi-ActWe Contro! of Whed Hop in Ground Ve-bidet

D.L. Margolis

Univ. of California, Davis, CA 95616, N/ehicle Syst. Dynam.. J2 (6). pp 317-330 (Dec 1983) 10 figs, 7 refs

Kay Words: Su*>ension systemt (yahtclas), Acthre isolatłon

A two dagree-of-freedom yehicle model is developad which inoorporates passłve, actłve, and semFacthre sacondary sut-pensions. The model is usad to demonstrate the tradeoffs which ara łnherent in attempting to provlde deslrable sprung weight isolation whila at tha same tIma controlling unsprung wełght mottons. A llnear model is usad first in order to oom-pare pass iw and ectłw su*>enstons in an analytically under-standable configu rat ion. Tha semi-actłve su«>enston is In* herently nonlinaar and is oomparad to the others through Computer słmutatton.

84-1644

Modal Analysis of Rigid Bodies Supported by Low Frequency Pneumatic Yibration Isolators

H.D. Sigel and G.C.Pardoen

Newport Corp., SAE Paper No. 821481 (SP-529)

Kay Words: Modal analysis, Isolators, Frequency response

Classical techniques for detarminlng accurate frequencies and modes of a rfgid body supported by pneumatic vibration isolation mount* wara deemed unsetisfectory. It was found that tha isolitor'i transfer function* were nonlinear and exhbited frequency dependent stiffnessand damping characteristics. To overcome these shorteomings a Computer model of the isolator's frequency response was developed by curve fitting a Lepiące polynomial to the experimentelly derived transfer funettons. By mathemattoally combining the iso-lator‘s response characteristics with e variety of rigid bodies the total system*s performance under e number of laboratory configurattons could ba aff iciamly pradicted.

84-1645

How fo Select Power-Tram Isolators for Good Performance and Long Senrice Life

R. Racca. Sr.

Barry Controls/a Unit of Barry Wright Corp., SAE Paper No. 821095

Kay Words: Isolators, Elastomers. Drlwline vtoratton*

This papar presents thoee factors that must ba considered in salacting elastomer ic isolators for powar-train appl kation* in order to develop an isolation system that will ba both effec-

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