High-frequency response analysis via algebraic substructuring

2008 ◽  
Vol 76 (3) ◽  
pp. 295-313 ◽  
Author(s):  
Jin Hwan Ko ◽  
Zhaojun Bai
Keyword(s):  
Frequency Response ◽  
High Frequency ◽  
Response Analysis ◽  
Frequency Response Analysis ◽  
High Frequency Response

scholarly journals Implementation and experiment of a novel piezoelectric-spring stage for rapid high-precision micromotion

2020 ◽  
Author(s):  
Lanyu Zhang ◽  
Jian Gao
Keyword(s):  
Frequency Response ◽  
High Frequency ◽  
High Performance ◽  
Tracking Error ◽  
Response Analysis ◽  
Error Performance ◽  
Performance Tasks ◽  
Output Displacement ◽  
High Frequency Response ◽  
Spring Element

AbstractA precision micromotion stage is significant in the microelectronics-manufacturing field to realize high-performance tasks. The output position error and limited frequency response influence the working performance and efficiency of the micromotion stage. A novel piezoelectric-based (PZT) reciprocating micromotion stage with a special spring-PZT structure is proposed in this paper to cater to the high manufacturing demands and achieve rapid precision micromotion performance. This structure is designed to use a high-stiffness spring element as the flexure deformation structure, by utilizing the linearity of the spring, for achieving precise output/input ratio and high-frequency response. The feasibility of the micromotion stage is explored through theoretical analyses, including a dynamic response analysis, frequency response analysis, output displacement, and rapidity analysis of the specialized spring-PZT structure. For the inherent hysteresis challenge of the PZT-based structure, a feedforward subdivided proportional–integral–derivative method is adopted for system implementation. Subsequently, an optimal design of the stage is established, and the expected motion performance is verified experimentally. Finally, a series of experiments in terms of output ratio property analysis, dynamic hysteresis characterization, tracking error performance, and response rapidity are conducted for different micromotion frequencies and strokes. It is indicated that the stage can achieve nanometre-level precision and high-frequency micromotion simultaneously, which could be applied in the microelectronics manufacturing for rapid precision micromotion operations.

scholarly journals Interpretation of Frequency Response Analysis for Fault Detection in Power Transformers

2021 ◽  
Vol 11 (7) ◽  
pp. 2923
Author(s):  
Salem Mgammal Al-Ameri ◽  
Muhammad Saufi Kamarudin ◽  
Mohd Fairouz Mohd Yousof ◽  
Ali A. Salem ◽  
A. Abu Siada ◽  
...  
Keyword(s):  
Frequency Response ◽  
High Frequency ◽  
Short Circuit ◽  
International Standards ◽  
Response Analysis ◽  
Frequency Response Analysis ◽  
Three Phase ◽  
One Step ◽  
Interpretation Process

Frequency response analysis (FRA) is a method of monitoring a power transformer’s mechanical integrity. However, identifying the type of fault and its severity by comparing measured responses is still challenging and mostly relies on personnel expertise. This paper is taking one step forward to standardize the FRA interpretation process by proposing guidelines based on various international standards and FRA case studies. In this study, the FRA signature is divided into three regions: low-, mid- and high-frequency regions. The deviation from the fingerprint signature for various faults is classified into small, large, and no variations, based on the calculation of the correlation coefficient. The proposed guidelines are developed based on the frequency regions, and the level of variation is represented using a simple arrow method to simplify the interpretation process. A case study is conducted on a three-phase 11/0.433 kV, 500 kVA distribution transformer with a short circuit winding fault to validate the proposed guidelines.

scholarly journals Low and high frequency model of three phase transformer by frequency response analysis measurement

Open Physics ◽  
2018 ◽  
Vol 16 (1) ◽  
pp. 117-122 ◽  
Author(s):  
Moustafa Sahnoune Chaouche ◽  
Samir Moulahoum ◽  
Hamza Houassine
Keyword(s):  
Frequency Response ◽  
High Frequency ◽  
Analysis Data ◽  
Wide Frequency Range ◽  
Response Analysis ◽  
Frequency Response Analysis ◽  
Frequency Model ◽  
Proposed Model ◽  
Three Phase ◽  
Frequency Behavior

Abstract The behavior analysis of the transformer is usually achieved by the frequency response analysis (FRA), which is obtained by the application of a very low AC voltage in over a wide frequency range. This paper presents a low and high frequency modelling approach of a three-phase transformer. The developed model consists of a cascade of parallel RLC cells, whose parameters are identified using the frequency response analysis data measurements obtained on each transformer phase. Thus, the proposed model can simulate the frequency behavior of the transformer windings without reference to the geometries of the coils which makes it easily usable in the failure diagnosis field. Experimental results on a 300 VA laboratory transformer validate the proposed model.

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