传统BIM（Building Information Model）软件使用方式存在使用成本高、效率低,安装时间长、移动端设备无法使用等不足。考虑到云服务具有按需服务、使用方式灵活、资源使用率高等特点,尝试将BIM软件与SaaS（Software as a Service,软件即服务）层云服务相结合,提出一种基于Revit的BIM云服务构建方法。该方法综合应用Revit二次开发、文档数据库、消息队列等信息化技术,建设港口工程钢筋BIM模型应用云服务,在某港口工程码头项目中进行应用验证。结果表明该方法可将Revit软件部分功能以云服务方式提供给用户使用,拓展了BIM软件的使用方式,可为类似BIM软件云服务建设提供参考。 相似文献
To facilitate the commercialization of wave energy in an array or farm environment, effective control strategies for improving energy extraction efficiency of the system are important. In this paper, we develop and apply model-predictive control (MPC) to a heaving point-absorber array, where the optimization problem is cast into a convex quadratic programming (QP) formulation, which can be efficiently solved by a standard QP solver. We introduced a term for penalizing large slew rates in the cost function to ensure the convexity of this function. Constraints on both range of the states and the input capacity can be accommodated. The convex formulation reduces the computational hurdles imposed on conventional nonlinear MPC. For illustration of the control principles, a point-absorber approximation is adopted to simplify the representation of the hydrodynamic coefficients among the array by exploiting the small devices to wavelength assumption. The energy-capturing capabilities of a two-cylinder array in regular and irregular waves are investigated. The performance of the MPC for this two-WEC array is compared to that for a single WEC, and the behavior of the individual devices in head or beam wave configuration is explained. Also shown is the reactive power required by the power takeoff system to achieve the performance.
