Erection director

Erection Director 營建模擬

Erection Director 營建模擬

Related references

1. K. C. Lai and S. C. Kang, "Collision Detection Strategies for Virtual Construction Simulation," Automation in Construction, vol. 18, pp. 724-736, 2009.

2. W. H. Hung and S. C. Kang, "ConďŹ gurable Model for Real-time Crane Erection Visualization," Advances in Engineering Software, reviewing.

3. Y. C. Chang, W. H. Hung and S. C. Kang, "A fast path planning method for single and dual crane erections," Automation in Construction, vol. 22, pp. 468-480, 2012

Erection Director 營建模擬 本研究目的為研究有效且自動化的方法來協助工程，分為三個部分。研究內容包括開發一種簡單 而有效的碰撞檢測方法，可以即時且視覺化的偵測碰撞，VC-COLLIDE， 我們將工地的施工機械 和結構物模擬成球體和圓柱體 ，以加快碰撞檢測的演算法。 因為VC-COLLIDE專為使用虛擬實境 設計，它的計算性能顯著優於ODE(一種廣泛使用的視覺化物理引擎)。 第二，提出了一個可重複使用、快速建模，而且可以即時視覺化整個架設過程的方法。 起重機分 為三個模組，各自被分配到不同的架設任務。每個模組都是由多個剛體和關節所組成。提出的這 種建模方法不但可以套用現有的物理引擎，也很容易的將各種不同的起重機和架設工作視覺化。 最後，本研究開發出一種自動、高效的架設路徑規劃方法。 此方法將座標轉換為C-space，可以 明顯的減少路徑規劃所需要的計算時間。 適用於單、雙吊車架設，可以幫助工程師更容易地計劃 ，並驗證架設規劃決策。

Approximation of construction material

Erection Director

This research includes three parts. First, it develops a simple and efficient collision detection method to support the rendering of a virtual construction scenario in real time. We approximated construction machineries and structural elements on a construction site by using spheres and cylinders. Because VC-COLLIDE is designed specifically for using in a virtual construction scenario, its computational performance is significantly better than Open Dynamic Engine (ODE), a widely used physics engine for real-time visualization.

Second, it proposes a configurable model which is reusable, fast-prototyping, and extendable to support real-time visualization of erection process. A crane is divided into three modules that the developed model can be reconfigured for different erection tasks.

Each module is defined using multiple rigid bodies and constraint joints of multibody dynamics. The proposed modeling method can also be easily adapted to existing physics engines. We observed the process of a common erection activity and compared with the visualization results using the proposed method to evaluate its feasibility. We also simulated a cooperative cranes scenario from an actual construction project to demonstrate the usability of the proposed method. We found that the proposed modeling method is easy to visualize various erection activities with different cranes and configurations. In the end, it develops a method for planning the erection path automatically and efficiently. This method replaces the use of hoist height as a coordinate of the configuration space (C-space), which can significantly reduce computation time needed during the planning process.

Construction machinery: (a) mobile crane; (b) tower crane.

Erection Director The crane model is divided into three components: the manipulation module, the suspension module, and the lifted-object module.

Layout of a crane's 2D C-space

The simulation process of the cooperative erection project

Shih-Chung Jessy Kang sckang@ntu.edu.tw sckang.caece.net