DC de-icing device is a new type of device jointly developed by China’s Electric Power Research Institute and Hunan Electric Power Design Institute after the frost disaster in 2008. This device has been widely used in various large substations to ensure the secure operation of power systems. But the device’s operation also has caused a high substation’s environmental noise which needs to be controlled. In this paper, the noise control engineering of the Jinhua 500KV Shuanglong substation’s DC de-icing device was introduced to clarify the principle and the calculation process of engineering design.

According to the mechanism of vibratory pile driving and non-linear stress-strain relation of soil, a nonlinear dynamic model for vibratory pile driving was established. In this model, the action of soil to the pile was represented by a soft nonlinear spring and a linear damper. The first approximate solution of the system in primary resonance case was obtained by using the method of multiple scales. Amplitude-frequency characteristic for steady primary resonance of the system was analyzed by selecting appropriate parameters. The initial displacement intervals in which the primary resonance had stable solutions in multi-solution frequency band were determined by using Matlab. Finally, the effects of construction parameters on amplitude-frequency characteristics for the primary resonance were discussed. The results of this research provide guidelines for vibratory pile driving construction.