scholarly journals Design and Research of Smart Neck Helmets Based on the KANO-QFD Model and TRIZ Theory

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Deng Zhao ◽  
Weiwei Chen
Keyword(s):  
Finite Element Analysis ◽  
Weighted Average ◽  
User Needs ◽  
Urban Residents ◽  
Kano Model ◽  
Element Analysis ◽  
Existing Problems ◽  
Average Analysis ◽  
Safety Protection ◽  
Engineering Measures

In order to better serve the safety protection of urban residents during cycling, the KANO model is used to analyze the problems encountered by users wearing helmets during cycling. Combined with QFD, the weighted average analysis of user needs and the importance of engineering measures of product technical characteristics is carried out and users are found. We used TRIZ innovative invention principles to analyze the key requirements and converted them into TRIZ standard problems. We used the corresponding invention measures to improve the existing problems of the helmet and verified the rationality of the design through finite element analysis. Through the KANO-QFD model combined with the TRIZ innovative invention principle, the helmet is optimized to improve its safety.

scholarly journals Optimization of Time-Weighted Average Air Sampling by Solid-Phase Microextraction Fibers Using Finite Element Analysis Software

Molecules ◽  
2018 ◽  
Vol 23 (11) ◽  
pp. 2736 ◽  
Author(s):  
Bulat Kenessov ◽  
Jacek Koziel ◽  
Nassiba Baimatova ◽  
Olga Demyanenko ◽  
Miras Derbissalin
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Solid Phase Microextraction ◽  
Solid Phase ◽  
Weighted Average ◽  
Internal Diameter ◽  
Analysis Software ◽  
Element Analysis ◽  
Time Weighted Average

Determination of time-weighted average (TWA) concentrations of volatile organic compounds (VOCs) in air using solid-phase microextraction (SPME) is advantageous over other sampling techniques, but is often characterized by insufficient accuracies, particularly at longer sampling times. Experimental investigation of this issue and disclosing the origin of the problem is problematic and often not practically feasible due to high uncertainties. This research is aimed at developing the model of the TWA extraction process and optimization of TWA air sampling by SPME using finite element analysis software (COMSOL Multiphysics, Burlington, MA, USA). It was established that sampling by porous SPME coatings with high affinity to analytes is affected by slow diffusion of analytes inside the coating, an increase of their concentrations in the air near the fiber tip due to equilibration, and eventual lower sampling rate. The increase of a fiber retraction depth (Z) resulted in better recoveries. Sampling of studied VOCs using 23 ga Carboxen/polydimethylsiloxane (Car/PDMS) assembly at maximum possible Z (40 mm) was proven to provide more accurate results. Alternative sampling configuration based on 78.5 × 0.75 mm internal diameter SPME liner was proven to provide similar accuracy at improved detection limits. Its modification with the decreased internal diameter from the sampling side should provide even better recoveries. The results obtained can be used to develop a more accurate analytical method for determination of TWA concentrations of VOCs in air using SPME. The developed model can be used to simulate sampling of other environments (process gases, water) by retracted SPME fibers.

Based on the Finite Element Method for Gear and Rack Research on Contact Fatigue Strength of Study

2012 ◽  
Vol 569 ◽  
pp. 339-342
Author(s):  
Yong Xiang Li ◽  
Lei Yang ◽  
Ming Xu Wang ◽  
Zhen Wang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Fatigue Strength ◽  
Contact Fatigue ◽  
Development Trend ◽  
Current Status ◽  
Element Analysis ◽  
Existing Problems ◽  
Contact Fatigue Strength ◽  
Gear Rack

The paper summarizes gear experimental method of contract fatigue strength and the current status in domestic and overseas analyzes the experimental current situation, existing problems and the development trend; introduces the applications of finite element analysis used in contact fatigue strength calculation. On this basis, has given the finite element analysis method in the solution gear rack contact fatigue strength testing research measure and the mentality.

Finite Element Analysis in Dynamic Conditions of Bridge Crane Beam

2013 ◽  
Vol 331 ◽  
pp. 70-73 ◽  
Author(s):  
Yi Bin He ◽  
Yu Zhang ◽  
Bing Kuan Yang ◽  
Shi Wen Liu ◽  
Ding Fang Chen
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Three Dimensional ◽  
Main Beam ◽  
Inertia Force ◽  
Bridge Crane ◽  
Element Analysis ◽  
Dynamic Conditions ◽  
Existing Problems ◽  
Design Software

On the basis of analysis of the existing problems in the bridge crane of today's society, bridge crane girders were modeled and calculated by using three-dimensional design software, then discussed its finite element analysis. It turns out the research and analysis of the main beam in load in static and dynamic conditions. Through a comparative study of displacement diagram and stress-deformation diagram in the case of loading inertia force or no inertia force, it provides important reference for the bridge crane design, optimization, and lightweight optimization.

Finite Element Analysis and Development for a New Draft Gear of Locomotive Couplers

2010 ◽  
Vol 43 ◽  
pp. 347-350
Author(s):  
Yan Gang Wei ◽  
Lan Qing Wang ◽  
Xiu Juan Zhang
Keyword(s):  
Finite Element Method ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Developed Countries ◽  
Structure Design ◽  
The Finite Element Method ◽  
Element Analysis ◽  
Existing Problems ◽  
Draft Gear ◽  
Element Method

In order to solve the existing problems of domestic applications, an innovative structure design for the draft gears of locomotive couplers is developed using the mechanical principles and the finite element method. In the condition of ensuring the performance, the draft gear structure is optimized, the number of draft gear parts is reduced, and the weight and cost of draft gear are cut down. After absorbing the foreign technologies, a new locomotive coupler draft gear is developed which achieves the equivalent-level performances as those of developed countries and fills the domestic gap.

scholarly journals Optimization of Time-Weighted Average Air Sampling by Solid-Phase Microextraction Fibers Using Finite Element Analysis Software

2018 ◽  
Author(s):  
Bulat Kenessov ◽  
Jacek A. Koziel ◽  
Nassiba Baimatova ◽  
Olga P. Demyanenko ◽  
Miras Derbissalin
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Solid Phase Microextraction ◽  
Solid Phase ◽  
Weighted Average ◽  
Air Sampling ◽  
Internal Diameter ◽  
Analysis Software ◽  
Element Analysis ◽  
Time Weighted Average

Determination of time-weighted average (TWA) concentrations of volatile organic compounds (VOCs) in air using solid-phase microextraction (SPME) is advantageous over other sampling techniques, but is often characterized by insufficient accuracies, particularly at longer sampling times. Experimental investigation of this issue and disclosing the origin of the problem is problematic and often not practically feasible due to high uncertainties. This research is aimed at developing the model of TWA extraction process and optimization of TWA air sampling by SPME using finite element analysis software (COMSOL Multiphysics). It was established that sampling by porous SPME coatings with high affinity to analytes is affected by slow diffusion of analytes inside the coating, an increase of analytes concentrations in the air near the fiber tip due to equilibration, and eventual lower sampling rate. The increase of a fiber retraction depth (Z) resulted in better recoveries. Sampling of studied VOCs using 23-ga Car/PDMS assembly at maximum possible Z (40 mm) was proven to provide more accurate results. Alternative sampling configuration based on 78.5 x 0.75 mm i.d. SPME liner was proven to provide similar accuracy at improved detection limits. Its modification with the decreased internal diameter from the sampling side should provide even better recoveries. The developed model offers new insight into optimization of air and gas sampling using SPME.

Internal Residual Strain Distribution in Chromium-Molybdenum Steel after Carburizing and Quenching Measured by Neutron Strain Scanning

2013 ◽  
Vol 772 ◽  
pp. 173-177
Author(s):  
Yoshihisa Sakaida ◽  
Hajime Yoshida ◽  
Shigeki Yashiro ◽  
Shohei Yamashita ◽  
Takahisa Shobu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Carbon Content ◽  
Residual Strain ◽  
Lattice Spacing ◽  
Weighted Average ◽  
Case Depth ◽  
Element Analysis ◽  
Molybdenum Steel ◽  
Transmission Gear

A hollow cylinder specimen of Cr-Mo steel with 0.20 mass% C was used as a model which simplified a motor cycle transmission gear. The specimen was carburized in carrier gas and quenched in oil bath. After quenching, the internal residual strain distributions in the radial, axial and hoop directions were mapped nondestructively by neutron strain scanning, and were compared with results of elastoplastic finite element analysis. The carbon content and hardness gradients were also measured to determine the case depth. Residual strain was calculated from lattice spacing change. In this study, unstressed lattice spacing was determined experimentally by measuring diffraction angle of coupons that were cut from the interior of the same carburized cylinder specimen. As a result, the carbon content and hardness distributions were almost accorded with finite element analysis results. On the other hand, the measured strains in some measuring points discorded with the analyzed weighted average strains. The peak widths in the interior of specimen equaled to that of unstressed coupons. Internal residual strain distributions were complicated and found to be elastic strains that were balanced with equivalent plastic strains due to transformation plasticity of case layer.

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