Optimization of Vehicle Offset Crashworthy Design Using a Simplified Analysis Model

2016 ◽  
pp. 63-78
Keyword(s):  
Analysis Model ◽  
Simplified Analysis

The Analysis of Automotive Door Seal Energy Consumption

2011 ◽  
Vol 80-81 ◽  
pp. 714-718
Author(s):  
Yun Kai Gao ◽  
Da Wei Gao
Keyword(s):  
Energy Consumption ◽  
Elastic Force ◽  
Bernoulli Equation ◽  
Analysis Model ◽  
Damping Force ◽  
Total Energy Consumption ◽  
Linear Elastic ◽  
Non Linear ◽  
Linear Damping ◽  
Simplified Analysis

The seal deformation of automotive door is caused by the door compression forces, including non-linear elastic force and non-linear damping force. The working principles of them are analyzed and a new simplified analysis model is built. Based on the Bernoulli equation and the law of conservation of mass, the mathematical models are established to calculate energy consumption of the seal system. According to the analysis results, the energy consumption of non-linear elastic force and non-linear damping force are respectively 84% and 16% of the total energy consumption of the seal system. At last, the calculation data is compared with the test data and the error is less than 5%, so the calculation method proposed in this paper is observed to be accurate.

An efficient simplified analysis model of a partially coherent Gaussian vortex beam

Laser Physics ◽  
2017 ◽  
Vol 27 (8) ◽  
pp. 085004
Author(s):  
Jianye Nie ◽  
Qianyi Xiao ◽  
Guodong Liu ◽  
Rongzhu Zhang
Keyword(s):  
Vortex Beam ◽  
Analysis Model ◽  
Partially Coherent ◽  
Simplified Analysis

Influencing factors and rules of shielding effectiveness of electromagnetic shielding clothing sleeve

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Xiuchen Wang ◽  
Zhe Liu ◽  
Long Wu ◽  
Yue Wang ◽  
Ying Su
Keyword(s):  
Design Methodology ◽  
Electromagnetic Shielding ◽  
Test Method ◽  
Shielding Effectiveness ◽  
Analysis Model ◽  
Content Type ◽  
Design Production ◽  
Simplified Analysis ◽  
Cuff Width ◽  
Peak Value

PurposeThe change rules of the shielding effectiveness (SE) of the sleeve has not been clarified, which leads to the lack of the basis for the design, manufacture and evaluation of the electromagnetic shielding (EMS) clothing.Design/methodology/approachAccording to a simplified analysis model, a series of sleeve samples with different fabrics and styles are designed and manufactured. The SE of the sleeve is tested with the proposed special test method in a semi-anechoic chamber to analyze the influence of different factors on the SE of the sleeve.FindingsThe SE is greatly reduced about 60–90% after the fabric is manufactured into the sleeve. The larger the sleeve length is, the higher the peak value of the SE is. When the sleeve length is low, the SE value is easy to appear negative. As the cuff circumference increases, the SE of the sleeve will change with the frequency band. The influence of the cuff style on the SE of the sleeve mainly depends on the cuff width and style. The larger the cuff width is, the lower the overall SE of the sleeve is. The more wrinkles there are at the cuff, the better the SE of the sleeve is.Originality/valueOur results provide a reference for the design, production and evaluation of the sleeve and the whole EMS clothing.

A Simplified Analytical Model for Estimation of the Initial Waterhammer Pressure and Force on a Circular Tube

2020 ◽  
Vol 143 (3) ◽  
Author(s):  
Jong Chull Jo ◽  
Jae Jun Jeong ◽  
Frederick J. Moody
Keyword(s):  
Analytical Model ◽  
Sound Speed ◽  
Circular Tube ◽  
Analysis Model ◽  
Dimensional Solution ◽  
Surrounding Water ◽  
Decompression Wave ◽  
Computational Fluid Dynamics Cfd ◽  
Fixed Radius ◽  
Simplified Analysis

Abstract A simplified analytical model is developed for estimating the initial waterhammer pressure and force on a circular tube when a plane decompression wave, parallel to its axis, passes over it. The simplified analysis superimposes the solutions for a plane pressure wave traveling at sound speed in the surrounding water, and two-dimensional solution to the wave equation in cylindrical coordinates, with a nonflow boundary condition across the tube boundary at a fixed radius. The analytical method is compared to the computational fluid dynamics (CFD) approach by applying to predict the initial waterhammer pressure and force on the closest tube to the feedwater nozzle of a geometrically simplified nuclear steam generator (SG) analysis model, caused by a feedwater pipe break (FWPB). As the result, it is found that the simplified analytical model, while not matching results of the CFD calculations with precise accuracy, does confirm the nature of the waterhammer impact pressure loads on the SG tubes.

Optimization of a Semi-Submersible Type Mega-Float Using a Risk Based Objective Function

2005 ◽  
Author(s):  
Hideyuki Suzuki ◽  
Satoshi Nakada
Keyword(s):  
Objective Function ◽  
Optimization Procedure ◽  
Optimal Configuration ◽  
Elastic Response ◽  
Computational Time ◽  
Analysis Model ◽  
Computational Load ◽  
Design Requirements ◽  
Simplified Analysis ◽  
Sufficient Precision

Design requirements for a Semi-submersible Type Mega-float are safety and functionality, and it has been shown that solutions which satisfy the requirements exist. In this paper, in order to find the optimal configuration of a semi-submersible type mega-float, an efficient optimization procedure and an objective function based on concept of risk were proposed. This function unifies the structural weight and the requirements of safety and functionality such as motion and elastic response. To reduce heavy computational load, a simplified analysis model with sufficient precision and short computational time was developed and used for the optimization. The simplified analysis model was developed based on the theory of plate. Using this modeling and the objective function, the structure was optimized and more efficient configuration of a semi-submersible type mega-float was obtained.

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