A Component-Based Meta Modeling Framework for Complex Product Virtual Prototype

2011 ◽  
Vol 346 ◽  
pp. 346-352 ◽  
Author(s):  
Tan Li ◽  
Ting Yu Lin ◽  
Xu Dong Chai ◽  
Bao Cun Hou
Keyword(s):  
Virtual Prototyping ◽  
Virtual Prototype ◽  
System Level ◽  
Modeling Framework ◽  
Complex Product ◽  
Cap Model ◽  
Meta Modeling ◽  
Level Model ◽  
High Level ◽  
Component Models

Effective reuse and integration of multidiscipline model resources is a key issue and challenge in the Virtual Prototyping for Complex Products. Based on the Meta Object Facility and Component-based Modeling, This paper proposes a new component-based Meta Modeling Framework (M2F) of Complex Product Virtual Prototyping as a solution, providing the model specifications for each abstract layer (CAP model, CIM model and High-level model) in the framework. M2F enables multi-layered abstraction of those isomerism models in Complex Product Virtual Prototype and facilitates the unified modeling, reuse and integration of models. A case study about typical complex product indicates this approach not only makes the system-level modeling of virtual prototype easy, but also improves the reusability of component models. At the end of this paper, conclusion and future works are given.

scholarly journals Dynamic modelling of a servo self-pierce riveting (SPR) process

2021 ◽  
pp. 095440542110374
Author(s):  
Daniel Tang ◽  
Mike Evans ◽  
Paul Briskham ◽  
Luca Susmel ◽  
Neil Sims
Keyword(s):  
Dynamic Modelling ◽  
System Level ◽  
Optimum Process ◽  
Current Limit ◽  
Level Model ◽  
System Level Model ◽  
Head Height ◽  
Extensive Experimental Data ◽  
High Level

Self-pierce riveting (SPR) is a complex joining process where multiple layers of material are joined by creating a mechanical interlock via the simultaneous deformation of the inserted rivet and surrounding material. Due to the large number of variables which influence the resulting joint, finding the optimum process parameters has traditionally posed a challenge in the design of the process. Furthermore, there is a gap in knowledge regarding how changes made to the system may affect the produced joint. In this paper, a new system-level model of an inertia-based SPR system is proposed, consisting of a physics-based model of the riveting machine and an empirically-derived model of the joint. Model predictions are validated against extensive experimental data for multiple sets of input conditions, defined by the setting velocity, motor current limit and support frame type. The dynamics of the system and resulting head height of the joint are predicted to a high level of accuracy. Via a model-based case study, changes to the system are identified, which enable either the cycle time or energy consumption to be substantially reduced without compromising the overall quality of the produced joint. The predictive capabilities of the model may be leveraged to reduce the costs involved in the design and validation of SPR systems and processes.

Research on Integrated System of Information and Function Based on Virtual Prototyping Technology

2008 ◽  
Vol 392-394 ◽  
pp. 884-890 ◽  
Author(s):  
Bingbing Yan ◽  
Fu Jun Ren ◽  
Y.C. Jiang
Keyword(s):  
Design Thinking ◽  
Virtual Prototyping ◽  
Virtual Prototype ◽  
Heterogeneous Data ◽  
Integrated System ◽  
Product Development Process ◽  
Complex Product ◽  
Component Object ◽  
Virtual Prototyping Technology ◽  
And Function

Virtual prototyping technology as a key technology for agile manufacturing can deal with multidisciplinary knowledge across different fields. In the complex product development process, the exchange between heterogeneous data in heterogeneous environment is a universal problem encountered, which increases the complexity of collaborative parallel design of virtual prototype. Taking the product models as carriers and the different function requirements as clues, the knowledge structure and expression of product information in various fields was studied. By adopting component object model technology, direct geometry access technology, behavioural modeling technology and parametric design thinking, the interaction among tools in various function units was realized, and the effective integration of information and function in multi-fields was accomplished, the parameter-driven virtual prototype architecture of complex product based on the integration of information and function was created. The feasibility of this architecture has been verified by the actual engineering. This plan provides an effective way to carry out virtual prototype projects for enterprise.

A Path-Based Equivalence Checking Method Between System Level and RTL Descriptions Using Machine Learning

2020 ◽  
pp. 2150074
Author(s):  
Jian Hu ◽  
Yongyang Hu ◽  
Qi Lv ◽  
Wentao Wang ◽  
Guanwu Wang ◽  
...  
Keyword(s):  
Machine Learning ◽  
Digital Design ◽  
Satisfiability Modulo Theories ◽  
System Level ◽  
Equivalence Checking ◽  
Smt Solver ◽  
Efficiency And Effectiveness ◽  
Finite State ◽  
Level Model ◽  
High Level

The growing complexity of modern digital design makes designers shift toward starting design exploration using high-level languages, and generating register transfer level (RTL) design from system level modeling (SLM) using high-level synthesis tools or manual transformation. Unfortunately, this translation process is very complex and error prone. The most important verification task is to check whether the RTL implementation is indeed equivalent to the system-level model. Equivalence checking is critical to ensure that the synthesized RTL conforms to its SLM specification. In this paper, we propose a novel path-based sequential equivalence checking method to validate the transformed RTL description against its corresponding SLM description. We represent the original SLM and the transformed RTL descriptions using Finite state machines with datapath (FSMD) and compare the path-pairs of the FSMD to obtain the equivalence of the designs. Then we recognize the corresponding path-pairs from all the generated paths of FSMD with Machine learning (ML) technique, and compare the recognized path-pairs by symbolic simulation and a satisfiability modulo theories (SMT) solver. Our method can handle designs without mapping information and improve the efficiency of the state-of-the-art path-based equivalence checking methods. The promising experiments on representative benchmarks indicate the efficiency and effectiveness of our method.

Study on Dynamic Performance of Tower Crane Based on ADAMS Multi-Flexible-Body

2012 ◽  
Vol 479-481 ◽  
pp. 1504-1509
Author(s):  
Chun Hua Zhao ◽  
Shi Jun Chen ◽  
Jin Zhang ◽  
Xian You Zhong ◽  
Nu Yan
Keyword(s):  
Fault Diagnosis ◽  
Natural Environment ◽  
Dynamic Performance ◽  
Virtual Prototyping ◽  
Virtual Prototype ◽  
System Level ◽  
Flexible Body ◽  
Tower Crane ◽  
Body Model ◽  
Virtual Prototyping Technology

When working, tower crane is affected by natural environment and is subjected to complex various loads. So it is not very easy to analyze its dynamic performance at system level. Some researchers have done some work as to simulation and analysis of tower crane, in order to study its dynamic performance. While much of their work based on grid body model but not flexible body model. This paper used SolidWorks and ADAMS to build the virtual prototype of a tower crane based on ADAMS flexible body. After the co-simulation, which joined ADAMS with SolidWorks, force of the connection between tower crane base and the strengthened section of the crane was recorded and analyzed. And so was the acceleration of the tower crane’s lifting rig. Succeeding in the application of Virtual Prototyping Technology based on ADAMS flexible body, this study can be used to direct the work, operation and fault diagnosis of tower crane, and lay a basis for further studies.

Dynamic Modeling of SOFC Cogeneration Systems for Light Commercial Applications

2014 ◽  
Author(s):  
Kevin J. Albrecht ◽  
Robert J. Braun
Keyword(s):  
Steady State ◽  
Waste Heat ◽  
System Level ◽  
System Component ◽  
Part Load ◽  
Load Following ◽  
Balance Of Plant ◽  
Level Model ◽  
Commercial Applications ◽  
Component Models

One potentially attractive application of solid oxide fuel cells (SOFCs) is for combined heat and power (CHP) in light commercial buildings. An SOFC-based CHP system can be employed to efficiently serve building thermal and electric loads, thereby lowering utility bills and offering many distributed generation benefits. It is often desirable to operate SOFCs in a predominately base load manner from a hardware viewpoint. However, systems in practice will experience some load dynamics during their lifetime and furthermore, optimal economic dispatch of CHP systems frequently recommends a load-following strategy. Thus, the present work is motivated by the need to understand the dynamic response capabilities of SOFC-CHP systems. Part-load performance and dynamic load-following capabilities of a 24 kW planar SOFC system for light commercial applications was investigated through computational modeling. The SOFC and balance-of-plant component models were implemented in gPROMS modeling software. The modeling strategy of each system component and associated transients are discussed. A dynamic SOFC channel-level model, which has been verified against experimental cell data, was integrated with additional balance-of-plant (BOP) component models consisting of a fuel reformer, tail gas combustor, turbomachinery, heat exchangers, and bypass valves. The performance of the system at part-load operation displays increases in electrical efficiency and decreases in CHP efficiency, as well as a more uniform PEN temperature profile. Modeling comparisons between the responses of systems consisting of either dynamic or steady-state BOP component models are reported. A fully dynamic system-level model displays anodic fuel depletion effects and waste heat recovery transients not captured by the steady-state models. The dynamics influence the ability of an SOFC system to load follow indicating when thermal and electric storage may be necessary.

Modeling and design of role engineering in development of access control for dynamic information systems

2013 ◽  
Vol 61 (3) ◽  
pp. 569-579 ◽  
Author(s):  
A. Poniszewska-Marańda
Keyword(s):  
Information Systems ◽  
Dynamic Information ◽  
Minimal Set ◽  
Distributed Information ◽  
Heterogeneous Information ◽  
System Protection ◽  
Level Model ◽  
Model Independent ◽  
Role Concept ◽  
High Level

Abstract Nowadays, the growth and complexity of functionalities of current information systems, especially dynamic, distributed and heterogeneous information systems, makes the design and creation of such systems a difficult task and at the same time, strategic for businesses. A very important stage of data protection in an information system is the creation of a high level model, independent of the software, satisfying the needs of system protection and security. The process of role engineering, i.e. the identification of roles and setting up in an organization is a complex task. The paper presents the modeling and design stages in the process of role engineering in the aspect of security schema development for information systems, in particular for dynamic, distributed information systems, based on the role concept and the usage concept. Such a schema is created first of all during the design phase of a system. Two actors should cooperate with each other in this creation process, the application developer and the security administrator, to determine the minimal set of user’s roles in agreement with the security constraints that guarantee the global security coherence of the system.

scholarly journals Aircraft Requirements for Sustainable Regional Aviation

Aerospace ◽  
2021 ◽  
Vol 8 (3) ◽  
pp. 61
Author(s):  
Dominik Eisenhut ◽  
Nicolas Moebs ◽  
Evert Windels ◽  
Dominique Bergmann ◽  
Ingmar Geiß ◽  
...  
Keyword(s):  
Systems Engineering ◽  
System Level ◽  
Policy Initiative ◽  
The European Union ◽  
Calculation Methods ◽  
Figures Of Merit ◽  
Performance Requirements ◽  
High Level ◽  
Different Levels ◽  
The Eu

Recently, the new Green Deal policy initiative was presented by the European Union. The EU aims to achieve a sustainable future and be the first climate-neutral continent by 2050. It targets all of the continent’s industries, meaning aviation must contribute to these changes as well. By employing a systems engineering approach, this high-level task can be split into different levels to get from the vision to the relevant system or product itself. Part of this iterative process involves the aircraft requirements, which make the goals more achievable on the system level and allow validation of whether the designed systems fulfill these requirements. Within this work, the top-level aircraft requirements (TLARs) for a hybrid-electric regional aircraft for up to 50 passengers are presented. Apart from performance requirements, other requirements, like environmental ones, are also included. To check whether these requirements are fulfilled, different reference missions were defined which challenge various extremes within the requirements. Furthermore, figures of merit are established, providing a way of validating and comparing different aircraft designs. The modular structure of these aircraft designs ensures the possibility of evaluating different architectures and adapting these figures if necessary. Moreover, different criteria can be accounted for, or their calculation methods or weighting can be changed.

Compressed sensorimotor-to-transmodal hierarchical organization in schizophrenia

2021 ◽  
pp. 1-14
Author(s):  
Debo Dong ◽  
Dezhong Yao ◽  
Yulin Wang ◽  
Seok-Jun Hong ◽  
Sarah Genon ◽  
...  
Keyword(s):  
Sensory Information ◽  
Resting State Fmri ◽  
Brain Regions ◽  
High Order ◽  
Hierarchical Organization ◽  
System Level ◽  
Integrative System ◽  
Sensorimotor Region ◽  
Cortical Hierarchy ◽  
High Level

Abstract Background Schizophrenia has been primarily conceptualized as a disorder of high-order cognitive functions with deficits in executive brain regions. Yet due to the increasing reports of early sensory processing deficit, recent models focus more on the developmental effects of impaired sensory process on high-order functions. The present study examined whether this pathological interaction relates to an overarching system-level imbalance, specifically a disruption in macroscale hierarchy affecting integration and segregation of unimodal and transmodal networks. Methods We applied a novel combination of connectome gradient and stepwise connectivity analysis to resting-state fMRI to characterize the sensorimotor-to-transmodal cortical hierarchy organization (96 patients v. 122 controls). Results We demonstrated compression of the cortical hierarchy organization in schizophrenia, with a prominent compression from the sensorimotor region and a less prominent compression from the frontal−parietal region, resulting in a diminished separation between sensory and fronto-parietal cognitive systems. Further analyses suggested reduced differentiation related to atypical functional connectome transition from unimodal to transmodal brain areas. Specifically, we found hypo-connectivity within unimodal regions and hyper-connectivity between unimodal regions and fronto-parietal and ventral attention regions along the classical sensation-to-cognition continuum (voxel-level corrected, p < 0.05). Conclusions The compression of cortical hierarchy organization represents a novel and integrative system-level substrate underlying the pathological interaction of early sensory and cognitive function in schizophrenia. This abnormal cortical hierarchy organization suggests cascading impairments from the disruption of the somatosensory−motor system and inefficient integration of bottom-up sensory information with attentional demands and executive control processes partially account for high-level cognitive deficits characteristic of schizophrenia.

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