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RISS 인기검색어
- 검색키워드
- 저자 : Zheming Cao (검색결과 3 건)
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Zheming Cao,Anugrah Kusumo Pamosoaji,Keum-Shik Hong 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
In this paper, we will implement polar polynomial curve (PPC) to produce a continuous-curvature path to guide an unmanned autonomous forklift from an initial to a final position in an unknown environment. Generalized polar polynomials are thus obtained which yields the path for fast motions. Important properties of the polynomials are shown and their use provides a method for computing the best motion consistent with the constraints. The approach is used for a forklift's dynamic model. The simulation result of the approach will be shown.
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Modeling of the Container Crane Mounted on a Ship
Zheming Cao,Quang Hieu Ngo,Keum-Shik Hong 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.6
In this paper, a control model for the container crane mounted on a mobile harbor (ship) is developed. The pitch and roll motions of the ship, which is under the influence of sea waves (sea state 3 condition), are assumed to be the main motions affecting the dynamics of the crane. By applying the extended Denavit-Hartenberg (DH) notation to the coupled ship-crane motions, the kinematic transformation matrices describing their relative motions are first established, and then the Lagrange method is used in deriving the equations of motion of the system. The effects of wave motions to the ship and crane dynamics are analyzed. Simulation results are provided.
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Zhenggang Cao,Peng Du,Zheming Chen,Zongshuai Wan 한국강구조학회 2016 International Journal of Steel Structures Vol.16 No.2
Recent researches have demonstrated that bolt-ball joints have a certain amount of flexural stiffness, so they should be classified as semi-rigid joints and it is possible to apply them on single-layer latticed domes. In order to study the stability and stressed skin effect of the latticed domes with bolt-ball joints, a series of nonlinear full-produce analyses were conducted on the basis of the design of an 80 m diameter single-layer latticed dome with bolt-ball joints, which is the main structure of the Shenbei New District citizen fitness center in Shenyang, China. Above all, the moment-rotation relations for bolt-ball joints, which were established based on numerical results, were introduced into the latticed dome numerical model. Then, the nonlinear stability analyses for the latticed dome in different construction stages were carried out by the above-mentioned numerical model under vertical loads and horizontal wind loads. The mechanical behaviors discussed in this investigation including the stability and the ultimate bearing capacity of the latticed dome in different construction stages, and the influence of the stressed skin effect on the stability of the latticed dome with decorated plates. The result shows that: after being properly designed, the latticed dome with bolt-ball joints can exhibit a good mechanical performance, and this successful application of bolt-ball joints on the Shenbei New District citizen fitness center can set an example project for the design of single-layer latticed domes with semi-rigid joints; under vertical loads, it is more dangerous for the 75% complete latticed dome, while the dangerous construction stage for horizontal wind loads is the 50% completed latticed dome; the stressed skin effect can increase the stability of latticed domes.
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