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Zhaoli Zheng,Fahui Zhu,Di Zhang,Yonghui Xie 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.3
A generalized and efficient method is proposed in this paper for parametric response analysis of large-scale asymmetric rotor. If the bearings are anisotropic in asymmetric rotor, the motion of the rotor-bearing system will be governed by ordinary differential equations with periodically time-variant coefficients in both fixed and rotating frame. Response analysis of such parametric system can be attempted by assuming solution based on Hill’s method. If the number of degree of freedoms (DOFs) of the original model is N and the number of terms considered in the truncated assumed solution is m, for response analysis one has to solve a set of equations with (2m+1)N unknowns. Calculating this kind of equations requires a lot of computational costs, and the application of 3D finite element model will lead to greater computational costs. To avoid this costly approach, the fixed-interface component mode synthesis (CMS) is employed to form a reduced-order model (ROM). Although conventional CMS is adequate enough to make response analysis of largescale structures, an optimized scheme still needs to be developed for the response analysis of large-scale asymmetric rotor to achieve high efficiency and accuracy. The optimized scheme concerning a single substructure and multiple substructures are established respectively. Finally, the developed approach is validated through a simple model and a large-scale realistic two-pole generator rotor. And factors that influence the parametric response are investigated.
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Reliability and Validity of the Chinese (Mandarin) Tinnitus Handicap Inventory
Zhaoli Meng,Yun Zheng,Shixi Liu,Kai Wang,Xiudan Kong,Yong Tao,Ke Xu,Guanjian Liu 대한이비인후과학회 2012 Clinical and Experimental Otorhinolaryngology Vol.5 No.1
Objectives. The Tinnitus Handicap Inventory (THI) is a commonly used self-reporting tinnitus questionnaire. We undertook this study to determine the reliability and validity of the Chinese-Mandarin version of the Tinnitus Handicap Inventory (THI-CM) for measuring tinnitus-related handicaps. Methods. We tested the test-retest reliability, internal reliability, and construct validity of the THI-CM. Two-hundred patients seeking treatment for primary or secondary tinnitus in Southwest China were asked to complete THI-CM prior to clinical evaluation. Patients were evaluated by a clinician using standard methods, and 40 patients were asked to complete THI-CM a second time 14±3 days after the initial interview. Results. The test-retest reliability of THI-CM was high (Pearson correlation, 0.98), as was the internal reliability (Cronbach’s α, 0.93). Factor analysis indicated that THI-CM has a unifactorial structure. Conclusion. The THI-CM version is reliable. The total score in THI-CM can be used to measure tinnitus-related handicaps in Mandarin-speaking populations. Objectives. The Tinnitus Handicap Inventory (THI) is a commonly used self-reporting tinnitus questionnaire. We undertook this study to determine the reliability and validity of the Chinese-Mandarin version of the Tinnitus Handicap Inventory (THI-CM) for measuring tinnitus-related handicaps. Methods. We tested the test-retest reliability, internal reliability, and construct validity of the THI-CM. Two-hundred patients seeking treatment for primary or secondary tinnitus in Southwest China were asked to complete THI-CM prior to clinical evaluation. Patients were evaluated by a clinician using standard methods, and 40 patients were asked to complete THI-CM a second time 14±3 days after the initial interview. Results. The test-retest reliability of THI-CM was high (Pearson correlation, 0.98), as was the internal reliability (Cronbach’s α, 0.93). Factor analysis indicated that THI-CM has a unifactorial structure. Conclusion. The THI-CM version is reliable. The total score in THI-CM can be used to measure tinnitus-related handicaps in Mandarin-speaking populations.
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