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Study on super-harmonic resonance for gear transmission based on teeth surface friction
Xigui Wang,Yongmei Wang,Xuezeng Zhao,Xinglin Li 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.11
Gear backlash and time-varying nonlinear meshing stiffness are the key design attributes of modern warship planetary gear transmission. The transmission prominent concern is teeth surface friction dynamics affect behavior and way. Therefore, the change of directionin meshing process, teeth surface friction will generate a larger oscillation, excitation response and energy consumption ways to affectdynamic characteristics of planetary gear transmission, which makes response range, dynamic behaviors more complex. Gear model andmulti scale equations for transmission are established, analyzing incentive role teeth surface friction when considering dynamic and staticload on influence law of gear resonance frequency response.
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Analysis and research on teeth thermodynamic coupling contact of gear transmission system
Wang, Xigui,Wang, Yongmei,Zhao, Xuezeng,Li, Xinglin Techno-Press 2015 Coupled systems mechanics Vol.4 No.3
In the gear meshing process, gear temperature field concerns the meshing surface friction, the friction heat depends on the contact pressure, the contact pressure is affected by the elastic deformation of gears and the temperature field caused by the thermal deformation, so the temperature field, stress field and displacement field should be mutual coupling. It is necessary to consider in meshing gear pair in the operation process of thermodynamic coupling contact stress (TCCS) and thermodynamic coupling deformation (TCD), and based on thermodynamic coupling analysis (TCA) of gear teeth deformation.
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Jianxiu Wang,Jiaxing Liu,Xiaotian Liu,Yunhua Jiang,Xuezeng Liu 대한토목학회 2017 KSCE JOURNAL OF CIVIL ENGINEERING Vol.21 No.3
Expansive soil swells, softens, and disintegrates when absorbing water, whereas it shrinks when losing water. Understanding the swelling characteristics of a shield tunnel in expansive soil is important. However, most in-site experiences on the swelling characteristics of a tunnel are obtained from the NATM tunnels constructed in swelling rock using drill and blast method; most laboratory experiments or theoretical analyses on the swelling characteristics of a shield tunnel in expansive soil are under certain hypotheses which have not been verified in actual situation. To solve the problems, the Slender West Lake tunnel was selected as the background, laboratory and in-site experiments were performed to understand the swelling characteristics of a shield tunnel in expansive clay. Four experimental sections were constructed in the actual tunnel. The measuring gauges were pre-installed in the segments in factory and the segments were installed in-site to observe the actual earth pressure and temperature during construction. The influences of expansive soil to the distributions and variations of earth pressure, bending moment, and temperature were analyzed. The increasing earth pressure was divided into three stages. Large earth pressure was detected at the top, bottom, left, and right sides of the tunnel. The earth pressure at the left and right sides was larger than that at the top and bottom. Large negative bending moment was detected at the top and bottom of the tunnel, whereas large positive bending moment was detected at the left and right sides of the tunnel. The minimum bending moment appeared at 45° oblique. The largest negative bending moment was larger than the largest positive bending moment. Based on the observations, a load mode of swelling pressure for a beam-spring model was suggested. It can be referred by the similar tunnels.
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