Research on the Three-dimensional Modeling and Optimization of a Virtual Tower Crane Based on 3DS Max, Solidworks and EON Professional

Three-dimensional modeling of virtual hoisting machinery is the critical works to structure the system of virtual construction, and the foundation to realize intelligent and interactive virtual hoisting. Aimed at enhancing the requests of image quality and stability of the virtual construction scene, taking a tower crane for example. We studied the technology of three-dimensional modeling and optimization of a virtual tower crane, and a method named two-stage model optimization was put forward. This depended on the modeling stage using Solidworks and 3DS Max and the performance optimization stage in EON. The practice of software development indicates that the proposed methods of three-dimensional modeling and optimization could satisfy the performance request of virtual construction system and be popularized to other virtual system.

Application Strategy of BIM Technology in Virtual Construction of Prefabricated Buildings

In order to improve the construction efficiency,save resources,reduce costs,and to protect the environment during the construction work,prefabricated buildings is an important process that is needed to be carried out during the construction.However,in the current situation,lack of knowledge related the prefabricated buildings,and irrationalities of the relevant staff,limits the practical application of the prefabricated buildings.Simulating construction through building information modeling(BIM),can fully simulate various situations that may occur in the construction process,and also can improve the quality and efficiency of the prefabricated building construction work,therefore,this paper analyzes the application strategy of BIM technology in the virtual construction of prefabricated buildings as a reference.

模拟仿真技术及其在训练领域的应用综述

未来高技术武器装备和作战行动、战场环境日趋复杂,依托现有仿真技术条件和模拟训练资源,构建网络化、体系化、智能化的模拟训练装备与系统,开展体系对抗模拟训练,是缓解高技术装备训练耗费大与资源有限的有效途径,是提高训练质量和水平的主要途径。总结分析了联合训练领域重点关注的仿真体系架构、仿真建模、蓝军模拟、信息体系仿真等技术发展现状与趋势,初步剖析了上述技术在美海军常态化训练环境、“阿尔法”智能空战模拟训练系统等典型系统、美“大规模演习2021”中的应用情况与作用效能,围绕提高体系对抗条件下的实战化模拟训练能力水平,从技术趋势和工程实现的角度,提出了5个值得重点关注的研究方向,可为本领域工程技术人员提供参考借鉴。

Template-based knowledge reuse method for generating high-speed railway virtual construction scenes

Virtual construction has become an important approach to the high-quality development of high-speed railways,but existing methods have problems such as low efficiency in generating virtual construction scenes and the inability to reuse construction knowledge.To support the rapid visual representation of multiple types of construction processes and construction methods,a template-based knowledge reuse method is proposed.The method includes using a component-based modeling mode to build body structure models of a high-speed railway project and generate a 3D scene;decomposing the construction process and building a construction process knowledge base;establishing joint linkage models of construction machinery and forming a construction method knowledge template;and fusing multiple types of information according to a time sequence to visualize the construction process.Based on the template-based knowledge reuse method,a prototype system was developed,and virtual construction experiments were carried out.The results show that this method achieves the reuse of construction knowledge at different levels including construction machinery level,construction method level,and work site level.Compared with animation software for virtual construction,this method improves the production efficiency by 87%.Moreover,this method can provide a multilevel knowledge reuse scheme for diversified virtual construction.

Towards digital architecture,engineering,and construction(AEC)industry through virtual design and construction(VDC)and digital twin

The architecture,engineering,and construction(AEC)industry is undergoing a substantial change,and the tech-nological advancements are shaping the future of this industry.Over years,numerous tools have been developed based on building information modeling(BIM)and the Internet of Things(IoT)to manage a variety of tasks and activities within different construction and operational phases in the AEC industry.Recently,with the advent of novel internet-enabled technologies in providing the ability of real-time connectivity,researchers have started to develop virtual design and construction(VDC)and digital twin approaches to remotely monitor,control,and optimize different work progresses and activities in real-time at any work level in the AEC industry.This paper presents a reference model to illustrates the main advantages and applications of VDC and digital twin,and to demonstrate their trends and anticipated cost savings in the AEC industry at a global level.These technological advancements along with augmented reality(AR)and virtual reality(VR)can offer the unique benefit of real-time monitoring of the current status as well as predicting the future of any physical structure at any level of work.The global demand and usage of these technological advancements will lead to great cost savings in the AEC industry which would be US$950 million in design and construction and US$400 million in operation and maintenance phases in the non-residential AEC industry in 2025.This paper also discusses the future challenges of VDC and digital twin in the industry.As a main line of future research,these technologies can simultaneously be utilized with artificial intelligence to enable human-centered decision making to automate and optimize work progresses.Such integrations of VDC,digital twin,artificial intelligence,and human-centered approaches will shape the future of the AEC industry and provide numerous research opportunities in this domain.

Research on the Construction of Agricultural Product Virtual Logistics Enterprise

With the development that the demand for agricultural products' consumer market is gradually toward to the direction of complication, the existing agricultural logistics organizational model cannot adapt to the characteristics of agricultural product logistics and the changes in the consumer demand. According to the analysis of virtual operation trend of agricultural product logistics enterprise, this paper expatiates the concept and characteristics of agricultural product virtual logistics enterprise(APVLE) and proposes four steps to build an APVLE, including the analysis of key elements about APVLE, the identification about agricultural product logistics business, the project decomposition of APVLE and the partner selection in APVLE.