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RISS 인기검색어
- 검색키워드
- 주제어 : crossarm (검색결과 3 건)
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조석연 ( Seogyeon Cho ) 한국동양예술학회 2014 동양예술 Vol.25 No.-
This study is a research on the crossarm, the tuning-device of the ancient string instrument Gonghu. For this, crossarms which were used in the ancient string instrument Gonghu were examined closely. And the present writer had conducted spot investigations in Louvre Museum, the British Museum, the Egyptian Museum, Shosoin Treasure House of Japan, and many principal regions of China. In there numerous important relics of ancient times and research materials are housed. I had compared and contrasted various types of crossarm on these objects, the graphic materials and literatures each other. And I could draw a conclusion from this comparative study that for the purpose of tuning three types of crossarm had been used in ancient Harp Gonghu: cylindrical crossarm, wooden nail crossarm, S-shaped crossarm. The characteristics of them are as follows: First, cylindrical crossarm is a form which ties the strings on cylindrical crossarm. From about 2000 BC in which the Gonghu was invented to the present this type is being widely and steadily used. This form tunes up by turning of cylindrical crossarm. This type is not appropriate for aaccurate and minute tuning of sound, but it has the virtue that the tuned sound don``t easily come loose. Second, wooden nail crossarm is a way which ties strings at wooden nail on the crossarm. This type has the virtue of simplicity and possibility of more delicate tuning. Above all by maintaining of the space between the strings and the body this type enables the instrument to make moreclean and pure sound. This type of wooden nail crossarm could be found in the Gonghus which were housed in the Egyptian Museum and Shosoin Treasure House. Third, S-shaped crossarm is the most distinctive and advanced method of three types. This type is to confirm in the lacquered Gonghu which was possessed in Shosoin Treasure House. This type was made by cutting two grooves in S-shape on a thick and long wood. By doing this, the strings which passed three-level wooden frame doesn``t easily come loose and it makes possible to tune accurate and delicate sound. This S-shaped crossarm is very scientifically constructed type, it shows excellent ability in tuning and fixing of sound. Above-mentioned three types crossarm are all essential and fundamental type for ancient string instrument. Furthermore, according to the need they could be also engrafted into the contemporary musical instrument. I hope that the results of this research on three types of crossarm could play fundamental roles not only in case of Gonghu but also in study and restoration of whole ancient string instrument.
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Stability analysis of prestressed stayed steel columns with split-up crossarm systems
Pengcheng Li,Zhiqiang Li,Bin Jia,Hao Wang 국제구조공학회 2020 Steel and Composite Structures, An International J Vol.34 No.5
A Prestressed stayed steel column is an efficient and lightweight way with regard to enhancing the stability behaviour of a compression column. In the past, researchers primarily concentrated on investigating the behaviour of stayed steel columns with horizontal crossarms. However, this article focuses on prestressed stayed steel columns with split-up crossarm system, in which the crossarms are aslant and rotational symmetrically arranged. A mathematical formula calculating the optimal pretension that corresponds to the maximum critical buckling load was established according to geometric analysis based on the small deformation assumption. It was demonstrated that critical buckling mode of this stayed column is different from the one with horizontal crossarms. The governing imperfection direction that should be adopted in the nonlinear buckling analysis was determined in this work. In addition, the effects of crossarm inclination, stay diameter, and crossarm length on the stability behaviour were investigated. An influencing factor denotes the ratio of the load carrying capacity of the prestressed stayed steel column to the Euler load of the main column was also obtained.
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1 방 밴드와 어댑터를 사용하여 구성한 겹완철 장주의 응력 및 피로해석
김완재(Wanjae Kim),이기철(Lee Kichul),황수천(Hwang Soo-chun),이건욱(Lee Gun-uk) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
Power pole and its components mainly support and shift power cable and its direction to properly distribute electric power to the need. Power pole assembly includes such components as supporting pole, crossarms, bands for crossarms and insulators. Considerable portion of external force are to be applied to crossarms and bands which connect crossarms to the poles. One-directional bands, 1D bands, are used for single crossarms and two-directional bands, 2D bands, for double cross arms. In the case of replacing a single crossarm by double crossarms, a band also has to be changed to a 2D band. Since replacing bands require a lot of work, a suggestion which utilize adapters to install double bands without the replacement of bands is made. This paper compares the results of stress and fatigue analysis of double crossarms with 1D band and adapter and double crossarms with 2D bands by finite element analysis. Finally structural integrity of the two structures are evaluated and then compared.
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