Research on Parametric Simulation Technology Based on Complicated Mechanism Design

2008 ◽  
Author(s):  
Wei Sun ◽  
Qingkai Han ◽  
Xiaopeng Li ◽  
Bangchun Wen
Keyword(s):  
Mechanism Design ◽  
Simulation Study ◽  
Parallel Mechanism ◽  
Parametric Modeling ◽  
New Method ◽  
Simulation Technology ◽  
The Core ◽  
Simulation Based ◽  
Complicated Mechanism

A new method is proposed, which is the core of parametric simulation based on complicated mechanism design. Furthermore, the connotation of parametric simulation is affirmed and the flow of parametric simulation based on complicated mechanism design is put forward. At last, taking a parallel mechanism as example, the technology of parametric simulation proposed is applied to the simulation study used ADAMS, which consist of analyzing mechanism, parametric modeling, creating GUI, creating menu and parametric simulation. The practice indicates that the method is effectual.

scholarly journals Determination of Objective Weights Using a New Method Based on the Removal Effects of Criteria (MEREC)

Symmetry ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 525 ◽  
Author(s):  
Mehdi Keshavarz-Ghorabaee ◽  
Maghsoud Amiri ◽  
Edmundas Kazimieras Zavadskas ◽  
Zenonas Turskis ◽  
Jurgita Antucheviciene
Keyword(s):  
Essential Elements ◽  
New Method ◽  
Multi Criteria Decision Making ◽  
Analysis Of Means ◽  
Simulation Based ◽  
Criteria Weights ◽  
The Stability ◽  
Computational Analyses ◽  
Weighting Methods

The weights of criteria in multi-criteria decision-making (MCDM) problems are essential elements that can significantly affect the results. Accordingly, researchers developed and presented several methods to determine criteria weights. Weighting methods could be objective, subjective, and integrated. This study introduces a new method, called MEREC (MEthod based on the Removal Effects of Criteria), to determine criteria’ objective weights. This method uses a novel idea for weighting criteria. After systematically introducing the method, we present some computational analyses to confirm the efficiency of the MEREC. Firstly, an illustrative example demonstrates the procedure of the MEREC for calculation of the weights of criteria. Secondly, a comparative analysis is presented through an example for validation of the introduced method’s results. Additionally, we perform a simulation-based analysis to verify the reliability of MEREC and the stability of its results. The data of the MCDM problems generated for making this analysis follow a prevalent symmetric distribution (normal distribution). We compare the results of the MEREC with some other objective weighting methods in this analysis, and the analysis of means (ANOM) for variances shows the stability of its results. The conducted analyses demonstrate that the MEREC is efficient to determine objective weights of criteria.

scholarly journals Comparison of Statistical Methods for Estimating Continuous Paediatric Reference Intervals: A Simulation Study

2021 ◽  
Author(s):  
Monsurul Hoq ◽  
Susan Donath ◽  
Paul Monagle ◽  
John Carlin
Keyword(s):  
Statistical Methods ◽  
Simulation Study ◽  
Assessment Tool ◽  
Polynomial Regression ◽  
Reference Intervals ◽  
Performance Measure ◽  
Parametric Models ◽  
New Method ◽  
Sample Sizes ◽  
Generalised Additive Model

Abstract Background: Reference intervals (RIs), which are used as an assessment tool in laboratory medicine, change with age for most biomarkers in children. Addressing this, RIs that vary continuously with age have been developed using a range of curve-fitting approaches. The choice of statistical method may be important as different methods may produce substantially different RIs. Hence, we developed a simulation study to investigate the performance of statistical methods for estimating continuous paediatric RIs.Methods: We compared four methods for estimating age-varying RIs. These were Cole’s LMS, the Generalised Additive Model for Location Scale and Shape (GAMLSS), Royston’s method based on fractional polynomials and exponential transformation, and a new method applying quantile regression using power variables in age selected by fractional polynomial regression for the mean. Data were generated using hypothetical true curves based on five biomarkers with varying complexity of association with age, i.e. linear or nonlinear, constant or nonconstant variation across age, and for four sample sizes (100, 200, 400 and 1000). Root mean square error (RMSE) was used as the primary performance measure for comparison. Results: Regression-based parametric methods performed better in most scenarios. Royston’s and the new method performed consistently well in all scenarios for sample sizes of at least 400, while the new method had the smallest average RMSE in scenarios with nonconstant variation across age. Conclusions: We recommend methods based on flexible parametric models for estimating continuous paediatric RIs, irrespective of the complexity of the association between biomarkers and age, for at least 400 samples.

The Study of CAP1400 Core Melt and Relocation for IVR Analysis

2017 ◽  
Author(s):  
Jiayun Wang ◽  
Wei Lu ◽  
Pei Wen Gu
Keyword(s):  
Complex Structure ◽  
Pool Analysis ◽  
Large Mass ◽  
Severe Accident ◽  
Retention Strategy ◽  
The Core ◽  
Melt Pool ◽  
Element Simulation ◽  
Simulation Based ◽  
Large Heat

IVR (In-Vessel Retention) strategy is designed as the key severe accident mitigation feature for CAP1400. This paper studies the core melt and relocation progression, which is the base of the melt pool analysis and assessment in the plenum. The MAAP and CFD code are used together to obtain the main insights of the phenomena during core melting. The MAAP code is adopted to have an overall understanding of the progress with the lumped calculation, while the CFD code is used as the tool to study the local failure of the complex structure such as shroud and barrel with finite element simulation. Based on the analysis, the core will heat up after uncovered, and the upper region will melt first to form the core melt pool, as there is still water exist in the active fuel region at the time of upper part rods melting, the debris would be refrozen to form crust to block the relocation. As the melt pool increasing, the shroud is melt-through from the corner, and melts would drop to fill the gap volume between the shroud and barrel before relocation to lower plenum. Furthermore, the barrel will be melted later and the debris relocation to the lower plenum from the core sideward. The melts will touch the lower core support plate before water in the plenum depleted, which provides large mass of metal to be melted into the pool, avoiding large heat flux to challenge the RPV in the pool forming stage.

The New Method for Machining Bigger Holes of Carbon Fiber Reinforced Plastics (CFRP)

2011 ◽  
Vol 186 ◽  
pp. 161-164 ◽  
Author(s):  
Jiang Min Ding ◽  
Yan Jie Sun ◽  
Chong Su
Keyword(s):  
Carbon Fiber ◽  
New Method ◽  
Fiber Reinforced ◽  
Carbon Fiber Reinforced Plastics ◽  
Reinforced Plastics ◽  
The Core ◽  
Whole Process ◽  
The Face ◽  
Fiber Reinforced Plastics ◽  
Carbon Fiber Reinforced

The new method is put forward for machining bigger holes of carbon fiber reinforced plastics (CFRP) in the face of the existent problems. The core drill is applied to machine CFRP from two end-faces according to regular order. The thrust is less than felted intensity between adjacent layers of CFRP in their whole process. Through special experiment, the method is not only economical but also convenient. The finishing workpieces have not defects such as burrs, avulsion and delamination. In addition, its precision and efficiency are very satisfactory to manufacturer.

Research on Simulation Techniques of Space Information Confrontation Based on Agent and HLA

2011 ◽  
Vol 121-126 ◽  
pp. 4112-4116
Author(s):  
Wei Kui Wang ◽  
Xin Hui Zhang ◽  
Shi Liang Yang ◽  
Yun Liu
Keyword(s):  
Development Trend ◽  
Effect Evaluation ◽  
Simulation Technology ◽  
Modeling Framework ◽  
Agent Modeling ◽  
Simulation Techniques ◽  
Simulation Based ◽  
Key Technologies ◽  
The Development Trend ◽  
Simulation Systems

This paper analyzes the shortcomings of the present applications of the space information confrontation simulation technology in the light of the development trend of the technology and points out establishing simulation platforms based on the HLA and Agent technologies is an effective method to carry out the demonstration and effect evaluation of space information confrontation systems. this paper also proposes an information confrontation Agent modeling framework and an architecture of space information confrontation simulation systems and describes several key technologies needing to be noted in the simulation based on the Agent and HLA technologies.

Hydraulic System Simulation Analysis of Shearer's Cutting Part Based on AEMSim

2012 ◽  
Vol 268-270 ◽  
pp. 841-844
Author(s):  
Li Rong Wan ◽  
Xing Hua Wang ◽  
Jian Liang Li ◽  
Bin Zhang ◽  
Xian Peng Li
Keyword(s):  
Dynamic Property ◽  
Hydraulic System ◽  
Simulation Analysis ◽  
System Simulation ◽  
Fluid Simulation ◽  
New Method ◽  
Simulation Technology ◽  
Rigorous Analysis ◽  
Mining Machinery ◽  
New Type

Simulation analysis on the hydraulic system of shearer's cutting part was established based on the research of fluid simulation technology. The hydraulic model was built using the AMESim software. By verifying the results, a new method about the rigorous analysis of holistic dynamic property of the hydraulic system is developed and a new way to design new type mining machinery and improve its capabilities is provided.

Sign in / Sign up

Export Citation Format

Share Document