Download or read book Prediction of Gear Mesh Induced High Frequency Vibration Spectra in Geared Power Trains written by Alston L. Gu and published by . This book was released on 1974 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: Characteristics of vibration spectra induced by gear meshes in both single gear reductions and planetary gear reductions were investigated. Methods were developed to analyze the planet-pass induced vibrations which exist in normal planetary gear reduction systems. It was found that the planet-pass vibration sideband frequencies occur both below and above the base signal at integer multiples of planet-pass frequency and that the sideband amplitudes may exceed that of the base signal. The effect of planet pair phasing on the vibration sideband spectra was determined for the CH-47 helicopter forward rotor drive transmission first-stage planetary reduction. A computer-implemented analysis was established for predicting vibration sidebands produced by variations in centerline distance, tooth transmitted force, and tooth support discontinuities for single gear mesh systems. (Modified author abstract).

Download or read book Monthly Catalog of United States Government Publications written by United States. Superintendent of Documents and published by . This book was released on 1974 with total page 1446 pages. Available in PDF, EPUB and Kindle. Book excerpt: February issue includes Appendix entitled Directory of United States Government periodicals and subscription publications; September issue includes List of depository libraries; June and December issues include semiannual index

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1988 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Shock and Vibration Digest written by and published by . This book was released on 1975 with total page 660 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Monthly Catalog of United States Government Publications written by and published by . This book was released on with total page 1386 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Monthly Catalog of United States Government Publications Cumulative Index written by United States. Superintendent of Documents and published by . This book was released on 1976 with total page 1466 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Cumulative Title Index to United States Public Documents 1789 1976 written by Daniel W. Lester and published by . This book was released on 1981 with total page 774 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Aeronautical Engineering written by and published by . This book was released on 1975 with total page 584 pages. Available in PDF, EPUB and Kindle. Book excerpt: A selection of annotated references to unclassified reports and journal articles that were introduced into the NASA scientific and technical information system and announced in Scientific and technical aerospace reports (STAR) and International aerospace abstracts (IAA).

Download or read book Government Reports Announcements written by and published by . This book was released on 1974 with total page 964 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Government Reports Announcements Index written by and published by . This book was released on 1974 with total page 1176 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Government Reports Annual Index written by and published by . This book was released on 1974 with total page 1064 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Government Reports Index written by and published by . This book was released on 1975 with total page 1074 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book ASME Technical Papers written by and published by . This book was released on 1974 with total page 598 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Mitigation of Gear Mesh Frequency Vibrations Utilizing a Hydrostatic Bearing written by Zamir Aimaduddin Bin Zulkefli and published by . This book was released on 2013 with total page 209 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the current environment of noise abatement, high frequency noises are especially objectionable. For gear drives, high frequency noises are symptoms of gear mesh-frequency vibrations which are ever-present due to the imperfect conjugate action between the gears. These vibrations are then transferred to the gear housing to be emitted as noise. The vibration energy flow can be disrupted, for example using a hydrostatic bearing as a low pass filter of vibrations while still preserving the positioning accuracy of the gear drive. Hydrostatic bearings are a class of fluid bearings consisting of externally pressurized fluid trapped in a recess to provide the necessary bearing support. Previous research has assumed the incompressibility of the working fluid in a hydrostatic bearing. In practice, the working fluid is not incompressible and the effect is not necessarily insignificant. Using the compressibility of the working fluid and the unique properties of a hydrostatic bearing, a low-pass filtering effect on the gear mesh-frequency vibrations can generated. This low-pass filter allows low frequency vibrations to be transmitted while high frequency vibrations are attenuated. The vibration attenuation disrupts its transmission to the gear housing and prevents its conversion into high frequency acoustic noise. Models to predict this low-pass filtering effect were developed using a control volume approach for constant flow and capillary flow compensation schemes while the compressibility of the working fluid is incorporated using the bulk modulus. A linear differential equation was then obtained. Using the solution to the differential equation and convolution, an expression for the frequency response of the transmitted dynamic pressure was developed. In addition, a proof of concept experiment was designed and implemented to validate the theoretical models. The experimental data shows similar attenuation of the transmitted dynamic pressure according to theoretical predictions for both the constant flow and capillary compensated flow models.

Download or read book Journal of Engineering for Industry written by and published by . This book was released on 1974 with total page 1420 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Gear Noise and Vibration written by J. Derek Smith and published by CRC Press. This book was released on 2003-04-08 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt: Based on over 40 years of consultation and teaching experience, Gear Noise and Vibration demonstrates logical gear noise and vibration approaches without the use of complex mathematics or lengthy computation methods. The second edition offers new and extended discussions on high- and low-contact ratio gears, lightly loaded gears, planetary and spli

Download or read book Prediction of Mesh Generated Gear System Vibrations written by Earl Quandt and published by . This book was released on 1986 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report analyzes the origination and transmission of vibrations from a single pinion-gear mesh to a typical gear structure. The mesh-generated vibrations are computed using the analytical approach of Mark, which has been formulated to consider each tooth separately, as well as mesh-averaged effects. A gear tooth axial load distribution model is developed based on pinion twist as the principal cause of nonuniformity for use in Mark's analysis. Vibration transmission from the mesh through the gear internals is modelled by a six degree of freedom lumped-mass analysis, while th casing dynamics are determined from an empirical model of similar gearboxes. It is concluded that this procedure can predict mesh-generated vibration levels of typical Navy locked-train double-reduction gears to a first order accuracy and is capable of further refinement. Keywords: Gear noise; Gear vibration; Mesh tones; Gear system vibrations; Sidebands; Fourier analysis of gear vibrations; Effect of K factor on gear noise.