Efficient Co-Rotational 3-Node Shell Element

Rama, Gil; Marinković, Dragan; Zehn, Manfred

doi:10.3844/ajeassp.2016.420.431

Cited by 3 publications

(3 citation statements)

References 17 publications

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“…During the four years of the first mission, the ship scanned 150,000 stars, searching for the small falls in light caused by planets that pass in front of them. In 2014, Kepler switched to the second mission called K2, where he still hunts planets but also makes a variety of observations (Wang and Yagi, 2016;Obaiys et al, 2016;Ahmed et al, 2016;Jauhari et al, 2016;Syahrullah and Sinaga, 2016;Shanmugam, 2016;Jaber and Bicker, 2016;Moubarek and Gharsallah, 2016;Amani, 2016;Shruti, 2016;Pérez-de León et al, 2016;Mohseni and Tsavdaridis, 2016;Abu-Lebdeh et al, 2016;Serebrennikov et al, 2016;Budak et al, 2016;Augustine et al, 2016;Jarahi and Seifilaleh, 2016;Nabilou, 2016;You et al, 2016;Zurfi and Zhang, 2016;Rama et al, 2016;Sallami et al, 2016;Huang et al, 2016;Ali et al, 2016;Kamble and Kumar, 2016;Saikia and Karak, 2016;Zeferino et al, 2016;Pravettoni et al, 2016;Bedon and Amadio, 2016;Chen and Xu, 2016;Mavukkandy et al, 2016;Yeargin et al, 2016;Madani and Dababneh, 2016;Alhasanat et al, 2016;Elliott et al, 2016;Suarez et al, 2016;Kuli et al, 2016;…”

Section: The Incredible Quantitymentioning

confidence: 99%

The TESS Satellite will Search for Planets in the Vicinity of our Solar System

Petrescu¹

2019

Journal of Aircraft and Spacecraft Technology

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The US Space Agency has launched from Cape Canaveral, Florida, the TESS satellite, which will search for planets near our solar system and study them in detail. "TESS will significantly increase the number of planets studied," said George Ricker of the Massachusetts Institute of Technology, MIT, before launching. "It will double the number of planets we've seen and detected with the Kepler telescope," he added. The Kepler Space Observatory has discovered 2,650, about 70% of the total worlds outside the solar system that is known to mankind. TESS was launched with a Falcon 9 rocket, which returned to Earth after sending the satellite to the Earth's orbit. The telescope used by NASA to "hunt" the planets led to the discovery of two heavenly bodies that seem to be ideal places for life. The two planets have the ideal dimensions and are at the right distance from their star. William Borucki, the Kepler telescope scientist, has announced that these two planets are the best candidates identified so far in the race to discover planets that host life. The findings were published in the journal Science. Experts announce that these two planets are an important milestone in the race for identifying extraterrestrial life. In the past, when astronomers identified exoplanets (planets outside our solar system) they did not meet all the criteria necessary to accommodate life forms. Many planets are not in the habitable area-at a distance from their star so they are not too hot or too cold, but ideal for the existence of liquid water. Until now, all the planets identified inhabitable areas were too large. Most likely, these planets were huge gas balls, like Neptune, not suitable for life. Instead, the Earth-sized planets discovered so far have been at a distance unsuitable for their stars. The two planets now identified by the researchers, Kepler-62-e and Kepler-62-f, meets all the necessary conditions for hosting life. The two planets are twin-they orbit the same star and are next to each other, less than Earth and Mars. Planets are a bit wider than Terra, but they are not too big. Kepler-62-e is a warm Hawaiian planet and Kepler-62-f is cool like Alaska, Borucki explained. Researcher David Charbonneau of Harvard University, co-author of this study, says, "It's the first planet I really think of," he said, "but Kepler-62-f may be able to host life forms." The researcher added that "we have overcome an important barrier. So, why not have life forms?" The planets are 1,200 light-years away from Terra. The star that it orbits dates back 7 billion years ago, being 2.5 billion years older than our Sun.

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Section: The Incredible Quantitymentioning

confidence: 99%

The TESS Satellite will Search for Planets in the Vicinity of our Solar System

Petrescu¹

2019

Journal of Aircraft and Spacecraft Technology

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“…As a result, the CS-DSG3 overcomes the drawback of the DSG3 element that the results are dependent on the node numbering. A detailed description of the CS-DSG3 element formulation is given in (Rama et al, 2016). The CS-DSG3 element stiffness matrix is given as:…”

Section: Cs-dsg3 Elementmentioning

confidence: 99%

“…In this study, the CS-DSG3 Co-Rotational (CR) shell element developed by Rama et al (2016) is extended to geometrically nonlinear analysis of composite shells integrated with piezoelectric layers. The essence of the applied CR-approach is described by .…”

Section: Introductionmentioning

confidence: 99%

Piezoelectric Co-Rotational 3-Node Shell Element

Rama¹,

Marinković²,

Zehn³

2016

American Journal of Engineering and Applied Sciences

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Abstract:Geometrically nonlinear FE-analysis of active piezoelectric thinwalled shell structures, based on a Co-Rotational (CR) formulation and the Cell-Smoothed Discrete-Shear-Gap 3-node shell element (CS-DSG3) is presented in this study. The electric potential across the thickness of piezolayers is approximated by a linear function. The basic assumption of the applied Co-Rotational (CR) FEM formulation is that translations and rotations are finite, whereas the strains are small. Large rotation theory is used to update the rotational degrees of freedom. The proposed formulation is tested by means of the originally developed program. A set of piezoelectric coupled static linear and nonlinear cases are studied and the obtained results are compared with those available in the literature. A very good agreement of the results is noted, whereby the numerical effort could be reduced and numerical stability improved compared to other geometrically nonlinear FEM formulations.

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Mechatronic Systems to the Braking Mechanisms

Petrescu¹

2020

Journal of Mechatronics and Robotics

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With the evolution of technology, the construction and geometry of the piston, together with the materials from which it is made, as well as the related manufacturing technologies, have been continuously improved. Thus, modern engines have become less polluting, working at higher temperatures and pressures. Body aerodynamics have been improved, leading to lower resistance forces from the air. Also, the internal losses of the engines, generated by friction, as well as those at the level of the tire-road interface were diminished. All these improvements to motor vehicles have led to a proportional decrease in native braking capacity. Moreover, this decrease is evident in tonnage vehicles, which are disadvantaged in terms of the small contact area of the friction elements in conventional braking systems. For these reasons as well as due to the attempts to coordinate the platoon of cars, the decrease of the fuel consumption, the increase of the safe speed of movement resulted in the necessity of the development of new auxiliary braking systems, or the improvement of the already existing ones.

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Efficient Co-Rotational 3-Node Shell Element

Cited by 3 publications

References 17 publications

The TESS Satellite will Search for Planets in the Vicinity of our Solar System

The TESS Satellite will Search for Planets in the Vicinity of our Solar System

Piezoelectric Co-Rotational 3-Node Shell Element

Mechatronic Systems to the Braking Mechanisms

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