الفهرس 
Survey of some perturbation techniques
The multiple scales technique (MST)Only 14 pages are availabe for public view
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Abstract
Although the study of pendulum motion is considered one of the ancient studies in the field of vibration, it still attracts the attention of many scholars
due to its multiple applications in practical life, the most important of which is currently energy harvest and its importance in wireless sensor and other applications in different fields such as building structures(chimneys, television towers,bridges,tall buildings, antennas),shipbuilding, pumps and robotic walking