Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article An Improved Flowchart for Gabor Order Tracking with Gaussian Window as the Analysis Window | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2011 Article ID 507215 9 pages doi 2011 507215 Research Article An Improved Flowchart for Gabor Order Tracking with Gaussian Window as the Analysis Window Yang Jin1 2 and Zhiyong Hao1 1 Department of Energy Engineering Power Machinery and Vehicular Engineering Institute Zhejiang University Hangzhou 310027 China 2 Department of Automotive Engineering Hubei University of Automotive Technology Shiyan 442002 China Correspondence should be addressed to Yang Jin jin__yang@ Received 1 July 2010 Revised 21 November 2010 Accepted 19 December 2010 Academic Editor Antonio Napolitano Copyright 2011 Y. Jin and Z. Hao. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. Based on simulations on the ability of the Gaussian-function windowed Gabor coefficient spectrum to separate order components an improved flowchart for Gabor order tracking GOT is put forward. With a conventional GOT flowchart with Gaussian window successful order waveform reconstruction depends significantly on analysis parameters such as time sampling step frequency sampling step and window length in point number. A trial-and-error method is needed to find such parameters. However an automatic search with an improved flowchart is possible if the speed-time curve and order difference between adjacent order components are known. The appropriate analysis parameters for a successful waveform reconstruction of all order components within a given order range and a speed range can be determined. 1. Introduction Because of the inherent mechanism features the frequency contents of the main excitations in rotary machinery are integer or fractional multiples of a fundamental frequency which is usually the rotary speed of the machine 1 . The integer or fractional .
