Collaborative Simulation Environment Research Articles

Study on Welding Deformation Correction of TC4 Titanium Alloy Panel Parts

Aiming at the problem that TC4 titanium alloy panel parts after welding have large internal residual stress and obvious panel deformation, which can’t meet the requirements of the parts, the viscoelastic plastic model of titanium alloy panel parts is established by finite element analysis, and the welding deformation-thermal alignment collaborative simulation environment is established by ANSYS, and the welding deformation and thermal alignment process are analyzed by numerical simulation. The law of shape correction when the correction temperature is 600 °C, 650 °C, 700 °C and the holding time is 3600s, 5400s and 7200s, respectively, and the calculation formula of springback rate is established to evaluate the effect of thermal shape correction, so as to optimize the heat treatment correction process. The results show that the correction temperature and holding time have obvious influence on the correction effect. When the correction temperature is 700 °C and holding time is 7200s, the correction effect is the best, and the springback rate is controlled below 25%, which meets the requirements of machining accuracy.

In-Vehicle Speech Recognition for Voice-Driven UAV Control in a Collaborative Environment of MAV and UAV

Most conventional speech recognition systems have mainly concentrated on voice-driven control of personal user devices such as smartphones. Therefore, a speech recognition system used in a special environment needs to be developed in consideration of the environment. In this study, a speech recognition framework for voice-driven control of unmanned aerial vehicles (UAVs) is proposed in a collaborative environment between manned aerial vehicles (MAVs) and UAVs, where multiple MAVs and UAVs fly together, and pilots on board MAVs control multiple UAVs with their voices. Standard speech recognition systems consist of several modules, including front-end, recognition, and post-processing. Among them, this study focuses on recognition and post-processing modules in terms of in-vehicle speech recognition. In order to stably control UAVs via voice, it is necessary to handle the environmental conditions of the UAVs carefully. First, we define control commands that the MAV pilot delivers to UAVs and construct training data. Next, for the recognition module, we investigate an acoustic model suitable for the characteristics of the UAV control commands and the UAV system with hardware resource constraints. Finally, two approaches are proposed for post-processing: grammar network-based syntax analysis and transaction-based semantic analysis. For evaluation, we developed a speech recognition system in a collaborative simulation environment between a MAV and an UAV and successfully verified the validity of each module. As a result of recognition experiments of connected words consisting of two to five words, the recognition rates of hidden Markov model (HMM) and deep neural network (DNN)-based acoustic models were 98.2% and 98.4%, respectively. However, in terms of computational amount, the HMM model was about 100 times more efficient than DNN. In addition, the relative improvement in error rate with the proposed post-processing was about 65%.

Cloud-hosted simulation-as-a-service for high school STEM education

Despite their advanced status, nations such as the United States of America continue to face a STEM (science, technology, engineering and mathematics) crisis in their education system. Lack of effective teaching modalities that can leverage real-world examples to stimulate student interest in STEM concepts are identified as one of the reasons for this crisis. To address these challenges, our research is investigating the use of innovative and attractive modeling and simulation frameworks for concurrent, interactive and collaborative STEM education where vehicular traffic serves as the real-world example to reify STEM concepts. Existing traffic-related tools, such as traffic simulators, however, do not provide: (1) intuitive abstractions to construct, refine, and simulate various traffic models that are commensurate to the level of high school students, (2) concurrent and scalable model execution, and (3) collaborative learning environments. On the other hand, although intuitive abstractions such as Google Maps exist, these abstractions do not support semantics for dynamic behavior, which is representative of real-world traffic scenarios. To overcome both these challenges and address the STEM problem, this paper presents a Cloud-based, Collaborative, and Scaled-up Modeling and Simulation Framework for STEM Education called C2SuMo. The key contribution of this paper lies in the design and implementation of a cloud-based, elastic modeling and simulation framework that provides an intuitive, model-driven, collaborative, and concurrent visual simulation environment for STEM education. The paper also reports on insights we gained conducting a user study involving over sixty high school students.

Research on the Optimization of the Lower Arm of WEDM Taper Machine

Taking the lower arm of DK7725 WEDM Taper Machine as the research object, this paper uses the ANSYS Workbench collaborative simulation environment to analyze equivalent stress and deformation of the lower arm in the different working conditions, find the weak part of Lower Arm, analyze static structure of the lower arm, and improve lightweight design. According to the characteristics of Taper Machine overall structure and optimization variables, using the Design of Experiments (DOE) method, this paper combines the response surface method (RS), goal driven optimization method (GDO) with multi objective genetic algorithm optimization method (MOGA) with the candidate schemes, extractes candidates from the calculation program, insert the candidates as the design points into the whole optimization calculation. By controlling parameter allowable error, this experiments obtains the best optimal solution. The results show that if the mass of the lower arm is decreased 13.28%, the lower arm has stable dynamic performance,and get good optimization effect.

Collaborative Simulation Environment for mechanical system design

Widespread application of product performance analysis in mechanical product design stage demands to efficiently manage simulation flow and engineering data. Therefore, the solution of Collaborative Simulation Environment (CSE) was presented, and its function framework and system architecture were analysed. The key technologies of multi-hierarchy Engineering Data Management (EDM) and simulation flow control were researched. Engineering data can be classified and hierarchically managed through multi-hierarchy EDM technology based on XML. Effective management for simulation flow can be carried out through simulation flow control technology based on workflow management technology. On the basis of the architecture and key technology of CSE solution, flow model platform and web portal of some suspension system CSE were developed, using which the product simulation period can be greatly shortened and the design efficiency can be increased. The results of application show the validity of the method.

Application Research on Collaborative Design of Engineering Machinery Design

This paper elaborates the main contents of collaborative design supported by computer and discusses cores of collaborative design architecture of engineering machinery and real-time collaboration under the CAD environment. Under the collaborative characteristics of simulation technology, it expounds the notion of collaborative simulation and operational environment. Finally it points out that cooperative work supported by computer has a broad applied prospect in the manufacturing industry of engineering machinery.

Data Management System for Complex Mechanical Product in Collaborative Simulation Environment

In order to implement collaborative work in enterprises, it is important to exchange and share data during product design process. According to the characteristics and types of simulation data for mechanical properties analysis, an effective data management method is presented. Based on the functional framework of collaborative simulation environment, a new database system has been designed by combining relational database and content repository. The content repository for simulation data has been established and designed by user-defined node type whose model is a simple hierarchy. In this repository, simulation metadata have been stored as node properties. Furthermore, simulation data files can be stored in node which facilitates the upload and download of files. In the mean while, simulation flow data can be stored in relational database. An engineering application is employed to demonstrate the feasibility and practicability of the data management system.

A heterogeneous model integration and interoperation approach in distributed collaborative simulation environment

The integration and interoperation among heterogeneous distributed models is an important technique to realise distributed collaborative simulation for complex product development. HLA and web service technology are employed to facilitate the integration in this paper. First, the HLA-enabling method based on HLA agent model is proposed to make models created through commercial software conforming to HLA standard. In order to make up the drawbacks of HLA based simulation in interoperability on the WAN, a collaborative simulation framework by combining HLA with web service merits is proposed and described in details. Finally, a prototype system for heterogeneous models integration in forging manipulator system is implemented, where a method of developing ABAQUS engine agent is present, which could solve the difficulty of wrapping ABAQUS software. The case study verifies the high fidelity and effectiveness of our integration and interoperation approach.

A HLA-Enabling Method in Collaborative Simulation Environment for Complex Product Development

HLA-based collaborative simulation is an effective way to integrate different disciplinary models together for the design and development of complex product. In this paper, the HLA-enabling method based on HLA agent model is proposed to make models created through commercial software compatible with HLA standard. Next, a prototype system for forging manipulator system based on such HLA-enabling method is developed accordingly, where an approach of developing ABAQUS engine agent is proposed, which solves the difficulty of wrapping ABAQUS software. Finally, a case study on forging and manipulating process is conducted and verifies the high fidelity and effectiveness of our collaborative simulation technology.

9.2.1 Using SysML and UML To Develop and Implement Interoperable System Components for Engagement Simulations

AbstractThe Torpedo Enterprise Advanced Modeling and Simulation (TEAMS) project is an initiative funded by the Office of Naval Research to develop a cross‐enterprise, collaborative undersea warfare modeling and simulation (M&S) environment using reusable components that can be composed into simulations. This environment will include an open systems architecture and result in the sharing and leveraging of legacy and new‐development resources; it will support the development of M&S tools and the application of these tools across the lifecycle of undersea weapons. TEAMS initial model was delivered in the Unified Modeling Language (UML). When the Object Management Group (OMG) adopted the OMG System Modeling Language (OMG SysML™) specification, the Open Systems Joint Task Force of the Office of Secretary of Defense funded TEAMS to assess the utility of applying SysML in place of UML. This paper describes the torpedo M&S domain as it relates to TEAMS, discusses the application of SysML to existing UML artifacts, and assesses the utility of SysML from the TEAMS perspective.

An integrated and collaborative approach for complex product development in distributed heterogeneous environment

Multidisciplinary collaborative modeling and simulation is an effective approach to verify the dynamic behaviour of a complex product such as an aerospace vehicle or a locomotive. The design environment of such products must cater for the requirement for geographical distribution and structural heterogeneity in the modern industrial context. The focus of our research is a solution for such a collaborative modeling and simulation environment. Our approach is to utilize the IEEE standard High Level Architecture for distributed simultaneous simulation execution and management. At the same time, Web services technology is employed to deploy and integrate functional models for the simulation. The method for model description in this framework is proposed. The techniques for simulation execution and service encapsulation are discussed. A prototype system is implemented and a case study of locomotive tilting component design is executed. We find that both High Level Architecture and Web services have their expertise for collaborative simulation and the integration of these two technologies does achieve better interoperability and reusability among heterogeneous simulation components in a distributed environment. The new approach has considerable promise for the efficient and successful complex product design.

1304 HLAに基づくメカ・エレ・ソフト連携協調シミュレーションの研究(OS1 生産システムの設計・管理・評価)

Recently, collaborative simulation environment is needed in the mechatoronics product design. In this research, a systematic collaborative simulation environment is proposed using HLA (High Level Architecture) which is the IEEE standard of a distributed simulation. In this report, an omni-directional electric wheelchair is joined to a federation as one federate, and the verification of acceleration control system is done. SILS (Software-in-the-loop) and HILS (Hardware-in-the-loop Simulation) using HLA can shorten the time until preparing the simulation and obtain more accurate simulation results.

Migrating legacy scientific applications towards CORBA‐based client–server architectures

AbstractA distributed object is a reusable, self‐contained piece of software that cooperates with other objects on the same machine or across a network in a plug‐and‐play fashion via a well‐defined interface. The Numerical Propulsion System Simulation (NPSS) attempts to provide a collaborative aircraft engine design and simulation environment based on this concept. Many scientific applications in aerodynamics and solid mechanics are written in Fortran. Refitting this legacy Fortran code with distributed objects can increase code reusability. In this paper, we focus on the novel use of a remote variable scheme to help programmers migrate the Fortran code towards a client–server architecture. This scheme gives the client the capability of accessing variables at the server site and makes it easier for programmers to couple component engine code. Through the operator overloading features in C++, remote variables can be used in much the same way as traditional variables. The remote variable scheme adopts the lazy update approach and the prefetch method. Preliminary performance evaluation shows that communication overhead can be greatly reduced. Copyright © 2001 John Wiley & Sons, Ltd.

Collaborative Virtual Simulation Environment for Radiotherapy Treatment Planning

The simulation of Radiotherapy Treatment Planning (RTP) is a normal procedure in oncology clinics carried out on a Simulator machine. The Virtual Simulation of RTP replaces the real Simulator machine with a virtual one by using the CT data sets of a patient instead of the real patient. In this paper, we present a collaborative virtual simulation environment of RTP, named EU-VIRTUOSO, which is based on volume rendering and telecommunication techniques. The RTP procedure is visualised on a virtual patient, which is created by using the CT data of the patient. Different volume rendering and volume interaction techniques, such as DRR, MIP, gradient surface, and iso-surface, supply physicians with high quality rendering images to simulate the real working environment of the Simulator machine. In the collaborative environment, physicians distributed at different locations can work together via network to plan the treatment or to validate the treatment plan on-line by a collaborative application sharing approach. Both concepts virtualised planning and collaborative planning improve the efficiency and accuracy of a radiotherapy treatment while reducing the effort for an individual patient.

A scalable virtual environment for large scale scientific data analysis

The growing complexity and sheer amount of data resulting from supercomputer simulations increases the need for new and intuitive analysis techniques such as VR. In this paper we present a scalable VR system integrated in a distributed and collaborative visualization and simulation environment which can be used for scientific data analysis and computational steering in several application domains. After discussing the requirements for such a system we describe the basic architecture of the VR environment. We then give some examples of currently investigated application domains in the areas of water turbine optimization and space vehicle re-entry and comet impact simulation involving metacomputing on a trans-atlantic scale.