http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Miaofei Cao (검색결과 1 건)
- 무료
- 기관 내 무료
- 유료
-
Aiqiang Zhang,Jing Wei,Hao Cheng,Bin Peng,Miaofei Cao 한국정밀공학회 2022 International Journal of Precision Engineering and Vol.23 No.11
Due to designers' demanding pursuit of high power-to-weight ratio, most components in aviation transmission, including casing and shafting, are designed as special-shaped thin-walled structures. The assumption of large stiffness is no longer applicable. The casing is rich in geometric features and is usually modeled by the finite element (FE) method. However, the huge number of degrees of freedom (DOFs) poses great challenges to dynamic design. Model condensation provides an effective method for matrix dimensionality reduction. Taking the case of a helicopter main reducer as an example, a dynamic modeling method based on experimental modal analysis-FE method-substructure condensation is proposed. In addition, a method for measuring condensation errors is proposed to help determine the minimum number of nodes and their most suitable locations. Finally, the condensed models with the minimum number of nodes which meet the accuracy requirements are obtained. In previous studies, beam elements were usually used to simulate shafting flexibility, but the number of nodes and model accuracy were rarely discussed. And the selection of beam elements has not yet been unified. The optimal combination of beam element stiffness and mass matrix is determined based on regular shafting. Furthermore, the applicability of beam element method and condensation method in shafting modeling with different degree of regularity is compared. The research provides substructure models considering both accuracy and calculation efficiency for the overall system modeling of the aviation transmission.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
