title: A noise level prediction method based on electro-mechanical frequency response function for capacitors.
abstract: The capacitors in high-voltage direct-current (HVDC) converter stations radiate a lot of audible noise which can reach higher than 100 dB. The existing noise level prediction methods are not satisfying enough. In this paper, a new noise level prediction method is proposed based on a frequency response function considering both electrical and mechanical characteristics of capacitors. The electro-mechanical frequency response function (EMFRF) is defined as the frequency domain quotient of the vibration response and the squared capacitor voltage, and it is obtained from impulse current experiment. Under given excitations, the vibration response of the capacitor tank is the product of EMFRF and the square of the given capacitor voltage in frequency domain, and the radiated audible noise is calculated by structure acoustic coupling formulas. The noise level under the same excitations is also measured in laboratory, and the results are compared with the prediction. The comparison proves that the noise prediction method is effective.
authors.affiliation: State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an, Shaanxi, China.
authors.forename: Lingyu
authors.initials: L
authors.lastname: Zhu
authors.affiliation: State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an, Shaanxi, China.
authors.forename: Shengchang
authors.initials: S
authors.lastname: Ji
authors.affiliation: Shaoxing Electric Power Bureau, Shaoxing, Zhejiang, China.
authors.forename: Qi
authors.initials: Q
authors.lastname: Shen
authors.affiliation: State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an, Shaanxi, China.
authors.forename: Yuan
authors.initials: Y
authors.lastname: Liu
authors.affiliation: State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an, Shaanxi, China.
authors.forename: Jinyu
authors.initials: J
authors.lastname: Li
authors.affiliation: State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an, Shaanxi, China.
authors.forename: Hao
authors.initials: H
authors.lastname: Liu
mesh_terms: D004560:Electricity; D004784:Environmental Monitoring / Q000295:instrumentation / Q000379:methods*; D006801:Humans; D009622:Noise; D011210:Power Plants; D014732:Vibration