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Group collaborative design solves complex engineering design problems by collecting the designers' design ideas in the design team. How to express and quantify the designers' ideas and select valuable and innovative design ideas is the main problem faced by group collaborative design. To solve this problem, a design mental model is proposed. Moreover, the quantitative method of mental model based on natural language processing technology and the comprehensive evaluation method of mental model based on information consistency are proposed. Taking the group collaborative design of the conceptual design of EPB shield machine as an example, the result shows that the proposed methods can effectively select the valuable and innovative design ideas of 5 designers from the design ideas of 12 designers, and promote the convergence and iteration of the group collaborative design scheme.

In the title compound, C16H16BrN, the bromo­butyl group lies on one side of the carbazole ring plane and has a zigzag shape. The dihedral angle between the two benzene rings is 0.55°. In the crystal, mol­ecules are connected by van der Waals inter­actions.