Experimental evaluation of a test base for ship engines

1995 ◽  
Vol 32 (6) ◽  
pp. 1048-1059
Author(s):  
Francisco de Rezende Lopes ◽  
Mariza Gomes Ribeiro
Keyword(s):  
Key Words ◽  
Experimental Evaluation ◽  
Dynamic Properties ◽  
Heavy Industry ◽  
Foundation Soil ◽  
Vibration Measurements ◽  
Resonant Frequencies ◽  
Test Base

During the test and running-in of some ship engines in a heavy industry, severe vibrations, of a magnitude that impeded precision work in other areas of the industry, were observed. Vibration measurements were carried out during the test of an engine that confirmed previous suspicions that resonance occurred during the test of some engine models. These measurements led to the determination of dynamic properties of the foundation soil, which allowed the computation of the resonant frequencies of other engine models, so as to avoid these frequencies during their tests. Key words : dynamics, foundations, instrumentation, analysis.

Determination of dynamic properties of flax fibres reinforced laminate using vibration measurements

2017 ◽  
Vol 57 ◽  
pp. 219-225 ◽  
Author(s):  
A. El-Hafidi ◽  
P.B. Gning ◽  
B. Piezel ◽  
M. Belaïd ◽  
S. Fontaine
Keyword(s):  
Dynamic Properties ◽  
Vibration Measurements ◽  
Flax Fibres

scholarly journals Dynamics of a Carriage System of Comparator for Calibrating the Line Standards of Length

2015 ◽  
Vol 12 (2) ◽  
pp. 15
Author(s):  
A. Kilikevičius ◽  
V. Vekteris ◽  
V. Mokšin
Keyword(s):  
Mathematical Models ◽  
High Precision ◽  
Dynamic Properties ◽  
Resonant Frequencies ◽  
Frequency Responses ◽  
Calculated Amplitude ◽  
Multi Body ◽  
Body Dynamic

This paper presents research dynamic properties of a calibration comparator which is used to calibrate high precision line standards of length. For this purpose, multi-body dynamic and mathematical models of a carriage system of the comparator were presented. Calculated amplitude-frequency responses and modes of oscillations allowed a determination of resonant frequencies of the system.  

THE EXPERIMENTAL EVALUATION OF THE CHANGE OF THE DYNAMIC PROPERTIES OF THE CAR VAZ-2110 IN THE EXPLOITATION WHEN USING PETROL AND GAS FUELS

2015 ◽  
Vol 2 (1) ◽  
pp. 67-71
Author(s):  
Абрамов ◽  
D. Abramov
Keyword(s):  
Experimental Method ◽  
Experimental Evaluation ◽  
Dynamic Properties ◽  
Measuring System ◽  
Actual Index

The experimental method is proposed for determination of own actual index of dynamics of the car using a measuring system on the basis of linear accelerometers. A comparison of the dynamic properties of the car VAZ-2110 when using petrol and gas fuels

Automation of selected brazes' dynamic properties in high-temperatures' measurement process

2013 ◽  
Vol 18 (2-3) ◽  
pp. 33-41
Author(s):  
Dominik Sankowski ◽  
Marcin Bakala ◽  
Rafał Wojciechowski
Keyword(s):  
Surface Tension ◽  
High Temperatures ◽  
Dynamic Properties ◽  
Automatic Measurement ◽  
Measurement Methodology ◽  
Joining Process ◽  
Wetting Force ◽  
Research Grant

Abstract The good quality of several manufactured components frequently depends on solidliquid interactions existing during processing. Nowadays, the research in material engineering focuses also on modern, automatic measurement methods of joining process properties, i.a. wetting force and surface tension, which allows for quantitative determination of above mentioned parameters. In the paper, the brazes’ dynamic properties in high-temperatures’ measurement methodology and the stand for automatic determination of braze’s properties, constructed and implmented within the research grant nr KBN N N519 441 839 - An integrated platform for automatic measurement of wettability and surface tension of solders at high temperatures, are widely described

DETERMINATION OF AFTER-RIPENING PERIOD AND HORMONAL RESPONSE OF OROBANCHE SOLMSII C.D. CLARKE SEEDS

1970 ◽  
Vol 11 (1) ◽  
Author(s):  
A. Bista ◽  
G. B. Khattri ◽  
B. D. Acharya ◽  
S. C. Srivastava
Keyword(s):  
Growth Hormone ◽  
Seed Germination ◽  
Key Words ◽  
Incubation Period ◽  
Seed Set ◽  
Summer Season ◽  
Conditioning Period ◽  
Root Parasite ◽  
One Year

To find out the ability of Orobanche seeds to germinate immediately after seed set, seeds were germinated periodically at an interval of three months for one year in GR24. Some Orobanche seeds were capable of germination immediately after seed set but most required about nine months as after ripening or incubation period to be able to germinate. The phenomenon of after ripening in Orobanche seeds could be taken as an ecological measure to dormant over following unfavorable wet summer season. The growth hormone studies on Orobanche seed germination have shown that GA3 at a concentration of 100 ppm substantially enhanced seed germination when applied during pre-conditioning period. NAA showed some stimulatory effect at 0.5 - 1.0 ppm when applied during post-conditioning period but the hormone if applied during pre-conditioning period inhibited the germination. Kinetin failed to stimulate the germination at all the concentrations tested. Key words: Germination, root-parasite, hormone. Ecoprint Vol.11(1) 2004.

Applications of Thermal Analytical Procedures in the Study of Elastomers and Elastomer Systems

1980 ◽  
Vol 53 (3) ◽  
pp. 437-511 ◽  
Author(s):  
D. W. Brazier
Keyword(s):  
Thermal Analysis ◽  
Dynamic Properties ◽  
Evolved Gas Analysis ◽  
Gas Analysis ◽  
International Standards ◽  
New Technique ◽  
Heating Rates ◽  
Single Experiment ◽  
Rubber Compounds

Abstract An attempt has been made to review the development of thermoanalytical procedures as they have been applied to elastomers and elastomer systems over the past 10 years. For all rubber industry products, temperature and its effects, either alone or in conjunction with the chemical environment, play an important role from the production stage through to the final failure of the product in the field. It is thus not surprising that thermal analysis, in which temperature is the prime variable, has found such diverse applications in elastomer studies. The identification and quantitative analysis of rubber formulations have received most attention. Such formulations produce characteristic “fingerprints” when studied in DTA, DSC, TG, or TMA. In DSC, the determination of the glass transition characteristics, the observation and determination of crystallinity, the detection of cyclization reactions, and the monitoring of thermal and oxidative degradation characteristics can all be observed in a single experiment covering the temperature range from −150 to +600°C. At normal heating rates, e.g., 20°C/min, such information is available in 40 min. TG/DTG analysis can yield the elastomer or elastomers content, oil and plasticizer, carbon black (level and often type), and inorganic ash in less than 60 min. Processing and curing can also be studied. Blend compatibility can be assessed on the basis of both Tg and crystallinity measurements and the data used to determine optimum mixing times. Sulfur vulcanization and peroxide curing of elastomers is readily monitored by DSC and can be used for confirmation analysis of the presence of curatives. Limitations in such analysis exist, but as understanding and ability to interpret cure exotherms increase, valuable information about the mechanism and the nature of the cured network will be obtained. The testing of rubber compounds involves many hours of labor by current procedures. The rapidity of thermal analysis promises to offer some relief. In addition to DSC and TG, TMA, a relatively new technique, offers a rapid approach to low-temperature testing. Dynamic mechanical analysis (DMA) offers a rapid route to determining dynamic properties, but as yet, relatively little has been published on the application of this new technique to elastomers. As environmental concern increases, techniques such as evolved gas analysis (EGA) and combined techniques such as TG/gas chromatography are predicted to play an important role. As for the future, it is readily apparent that the principles of the methods have been established and, in several cases, it now remains to reduce them to a practical level. In some areas, such as vulcanization studies, much remains to be undertaken to improve our interpretive skills. Although there is some indication that certain industries have produced “in-house” standards for the analysis of rubber compounds by DSC and TG/DTG, it will only be when national and international standards organizations study and produce standard procedures, that the techniques will be generally adopted. Maurer's prediction in 1969 of increased applications of DTA and TG in elastomer studies has undoubtedly proved correct, and with the proliferation of reliable commercial instrumentation, significant developments can be anticipated in the next decade.

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