Comparison of Grease and Solid Lubrication of Rolling Bearings Under Small-Stroke Reciprocation for Space Applications

A dynamical Bayesian significance testing method is proposed to examine information on performance variation of rolling bearings for space applications under the condition of an unknown probability distribution and trend in advance. Sub-series of time series of rolling bearing performance are obtained via a regularly sampling, probability density functions of sub-series are acquired with bootstrap and maximum entropy theory, a referenced sequence from sub-series is found by minimum variance principle, posterior probability density function is established according to Bayesian theory, and mutation probability is defined in the light of fuzzy set theory. At the given significance level, dynamical Bayesian significance testing for information on performance variation of rolling bearings is put into effect with the help of mutation probability. Experimental investigation presents that the method proposed can effectively detect variation information of rolling bearing performance with unknown probability distributions and trends.

Download Full-text

Lubrication Review—A Digest of the Literature for 1969–1970

Journal of Lubrication Technology ◽

10.1115/1.3451731 ◽

1973 ◽

Vol 95 (1) ◽

pp. 1-32 ◽

Cited By ~ 1

Author(s):

J. H. Rumbarger ◽

M. J. Devine ◽

L. Stallings ◽

M. Petronio ◽

W. A. Glaeser ◽

...

Keyword(s):

Compressible Fluid ◽

Fluid Film ◽

Solid Lubrication ◽

Metal Working ◽

Rolling Bearings ◽

Frictional Behavior ◽

Film Lubrication ◽

Fluid Film Lubrication

The volume of lubrication literature continued to expand, reflecting increased experimental and theoretical attention being focused upon this discipline. The following eleven categories of lubrication technology are summarized by authorities in each particular field: Developments in Lubrication (including synthetics and greases); Metal-working Lubricants; Plain Bearings; Frictional Behavior of Materials; Wear; Solid Lubrication; Rolling Bearings; Incompressible and Compressible Fluid Film Lubrication and Bearings; Static and Dynamic Seals; Gears and Splines. Over 600 reference publications are included in the review.

Download Full-text

4D printing technology, modern era: A short review

International Journal of Energy Technology ◽

10.32438//ijet.203015 ◽

2020 ◽

pp. 92-111

Author(s):

Khodadad Mostakim ◽

Nahid Imtiaz Masuk ◽

Md. Rakib Hasan ◽

Md. Shafikul Islam

Keyword(s):

Smart Materials ◽

Computer Aided Design ◽

Short Review ◽

Stimuli Responsive ◽

4D Printing ◽

Space Applications ◽

Printing Technology ◽

Practical Applications ◽

Biomedical Technologies ◽

Novel Material

The advancement in 3D printing has led to the rapid growth of 4D printing technology. Adding time, as the fourth dimension, this technology ushered the potential of a massive evolution in fields of biomedical technologies, space applications, deployable structures, manufacturing industries, and so forth. This technology performs ingenious design, using smart materials to create advanced forms of the 3-D printed specimen. Improvements in Computer-aided design, additive manufacturing process, and material science engineering have ultimately favored the growth of 4-D printing innovation and revealed an effective method to gather complex 3-D structures. Contrast to all these developments, novel material is still a challenging sector. However, this short review illustrates the basic of 4D printing, summarizes the stimuli responsive materials properties, which have prominent role in the field of 4D technology. In addition, the practical applications are depicted and the potential prospect of this technology is put forward.

Download Full-text

Efficiency of application of the phase-chronometric method and neurodiagnostics for monitoring the degradation of rolling bearings during operation

Izmeritel`naya Tekhnika ◽

10.32446/0368-1025it.2020-7-43-50 ◽

2020 ◽

pp. 43-50

Author(s):

A.S. Komshin ◽

K.G. Potapov ◽

V.I. Pronyakin ◽

A.B. Syritskii

Keyword(s):

Life Cycle ◽

Wavelet Analysis ◽

Metrological Support ◽

Rolling Bearing ◽

Technical Condition ◽

Measurement Information ◽

Rolling Bearings ◽

Vibration Diagnostics ◽

Bearing Life ◽

Alternative Approach

The paper presents an alternative approach to metrological support and assessment of the technical condition of rolling bearings in operation. The analysis of existing approaches, including methods of vibration diagnostics, envelope analysis, wavelet analysis, etc. Considers the possibility of applying a phase-chronometric method for support on the basis of neurodiagnostics bearing life cycle on the basis of the unified format of measurement information. The possibility of diagnosing a rolling bearing when analyzing measurement information from the shaft and separator was evaluated.

Download Full-text