Transient stability evaluation using line potential energy method

2006 ◽  
Author(s):  
W.P. Yuan ◽  
K.W. Chan ◽  
Y. Zhang
Keyword(s):  
Potential Energy ◽  
Energy Method ◽  
Transient Stability ◽  
Stability Evaluation ◽  
Potential Energy Method

scholarly journals Modeling and analysis of mesh stiffness for straight beveloid gear with parallel axes based on potential energy method

2018 ◽  
Vol 12 (7) ◽  
pp. JAMDSM0122-JAMDSM0122 ◽  
Author(s):  
Chaosheng SONG ◽  
Siwei ZHOU ◽  
Caichao ZHU ◽  
Xingyu YANG ◽  
Zufeng LI ◽  
...  
Keyword(s):  
Potential Energy ◽  
Energy Method ◽  
Mesh Stiffness ◽  
Modeling And Analysis ◽  
Potential Energy Method

scholarly journals Research on Meshing Stiffness and Vibration Response of Pitting Fault Gears with Different Degrees

2020 ◽  
Vol 2020 ◽  
pp. 1-7
Author(s):  
Jie Liu ◽  
Chengye Wang ◽  
Wenchao Wu
Keyword(s):  
Potential Energy ◽  
Energy Method ◽  
Time History ◽  
Vibration Response ◽  
Gear System ◽  
Normal Distribution Function ◽  
Meshing Stiffness ◽  
Calculation Results ◽  
Driving Wheel ◽  
Potential Energy Method

In order to study the influence of pitting on meshing stiffness, the normal distribution function is used to simulate the pitting location of pitting gear, and the potential energy method is used to analyze the influence of pitting on meshing stiffness. At the same time, the meshing stiffness of pitting gears with different degrees is analyzed by finite element method, and the validity of the calculation results with potential energy method is verified. On the basis of meshing stiffness, the dynamic model of gear system is established, and the vibration response of pitting gear system with different degrees is analyzed. The results show that with the increase of pitting area, the meshing stiffness decreases; the closer the meshing area of the driving wheel is to the pitting line, the more the meshing stiffness decreases, resulting in the intensification of vibration response and periodic impact; and in the time history diagram, there is a small spurious frequencies near the meshing frequency; in the phase diagrams and the Poincare diagram, trajectory and discrete point aggregation area is gradually increased.

scholarly journals Study of the Influences of Transient Crack Propagation in a Pinion on Time-Varying Mesh Stiffness

2016 ◽  
Vol 2016 ◽  
pp. 1-13
Author(s):  
Youmin Hu ◽  
Jikai Fan ◽  
Jin Yu
Keyword(s):  
Potential Energy ◽  
Energy Method ◽  
Propagation Model ◽  
Time Varying ◽  
Mesh Stiffness ◽  
Propagation Models ◽  
Material Fatigue ◽  
Stiffness Variation ◽  
Short Time ◽  
Potential Energy Method

Cracks in a cracked gear may further propagate by a tiny length in a very short time for several reasons, such as material fatigue and load fluctuations. In this paper, this dynamic process is defined as transient propagation of cracks. This research aims to calculate the time-varying mesh stiffness of gears when transient propagation of cracks arises, which has not been extensively studied in existing literatures. The transient propagation of cracks is modelled. An improved potential energy method is proposed by incorporating the propagation model into the potential energy method. The improved method can also be utilised to calculate the mesh stiffness of gears when transient propagation of cracks arises. Different transient propagation models are considered to simulate the propagation of cracks in a short amount of time. Different deterioration levels of cracks before transient propagation and different lengths and models of transient propagation are also examined. The variation rules of mesh stiffness caused by the transient propagation of cracks are summarised. The influence of the deterioration level of cracks on mesh stiffness variation when transient propagation arises is obtained. Simulation results show that the proposed method accurately calculates time-varying mesh stiffness when transient propagation of cracks arises. Furthermore, the method improves the monitoring of further propagation of cracks in gears from the perspective of time-varying mesh stiffness.

Centering Mechanism for Soft Contact Lenses

1999 ◽  
Vol 121 (2) ◽  
pp. 188-195 ◽  
Author(s):  
Guo Ming T. Funkenbusch ◽  
Richard C. Benson
Keyword(s):  
Potential Energy ◽  
Contact Lens ◽  
Energy Method ◽  
Contact Lenses ◽  
Soft Contact ◽  
Soft Contact Lenses ◽  
Soft Contact Lens ◽  
Potential Energy Method

A soft contact lens, because of its elasticity, can re-center itself over the cornea after it has been displaced by a blink. In this paper, a potential energy method is used to simulate the centering mechanism. Specifications for commercially available soft contact lenses and realistic eye shapes are used for the examples. With this technique we can compare the centering attributes of different lens and eye geometries.

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