The paper presents a study of the impact of oil mineral-based and synthetic-based oils on the efficiency of the single stage cycloidal gear. Experimental studies were carried out for different loads and input speeds of the gears. The reference levels were the results of theoretical calculations of efficiency of the cycloidal gear obtained at the corresponding values of loads and input speeds as in the experiment.
Abstract. The article undertakes the problem of vibrations induced in the cycloidal gearbox. The gearbox was calculated, designed and tested by the article authors. To perform the test a testing bench was built. The bench includes electric motors, torque meters and application to control working parameters. The input engine works at constant velocity mode and the braking unit with constant torque mode. The test was made for different configuration of working parameters.
On the basis of the documentation, the finite element beam model of the Shukhov's tower has been constructed. In 1970In -1971, after 50 years of exploitation, the study of the Shukhov's tower was conducted by the specialists. This study has revealed serious defects of the individual elements. It was found that the rolled profiles reaches 10 % of the cross section due to corrosion and the calculated resistance of the individual components is in the range of 170 MPa, which is somewhat lower than the standard values. In the present work the time factor is taken into account as a reduction of the wall thickness of the metal profiles. In this article the state of the stress under the own weight has been examined when the wall thickness corresponds documentation (1921) and after reducing the thickness by 2 mm (2011). Stability analysis has been performed taking into account only the compressive load from the own weight. In this paper the main frequencies and modes of vibration of the tower model, depending on the thickness of the profile wall have been calculated. The results were obtained under the assumption that the loss of thickness of the metal profiles of the tower is accompanied by the proportional loss of the own weight.On the basis of the documentation [1] the finite element model of Shukov's tower has been constructed (Fig. 1) Each of the six sections consisting of 48 segments with two C-shaped cross-section is connected through the walls by distance sleeve.
The effect of reducing the wall thickness in the stress-deformation condition of the Shukhov's towerIn 1970-1971, after 50 years of exploitation, the survey of the Shukhov's tower steel structures was conducted by the specialists [3]. They revealed significant defects in the individual elements. It was found that the rolled profiles rolled profiles reaches 10 % of their cross section due to the corrosion and the calculated strength of individual components is in the range 170 MPa, which is somewhat lower than the standard values.There is widespread "crevice" corrosion in the metal frame of the tower, especially at the contact elements and hard to clean connections.In the present work, the time factor is taken into account as a reduction of the wall thickness of the metal profiles. According to [4,5], the corrosion speed of the carbon steel in St3 (EN 12500, PN-EN ISO 12944-2:2000) for 10 year takes average values 5-12 μm/year.Taking the minimum value of this range we are able to predict decrease in the thickness after 90 years, to about 2.450 μm = 0.9 mm. However you can not exclude the possibility that in the area of riveted joints the reduction of the thickness can be up to 2 mm or more.The performed calculations take into account the loading by the own weight, the effects of wind, icing and snow [6,7].
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