Vibroacoustic Optimization of a Shell Structure Based on the Dynamics Analysis

2011 ◽  
Vol 58-60 ◽  
pp. 1077-1081
Author(s):  
Hai Hong Li ◽  
Yong Hui Chen ◽  
Shan Guo Guo
Keyword(s):  
Shell Structure ◽  
Thin Shell ◽  
Three Dimensional ◽  
Fem Analysis ◽  
Dynamics Analysis ◽  
Dynamics Modeling ◽  
Three Dimensional Model ◽  
Modeling And Analysis ◽  
Analysis And Design ◽  
Shape Pattern

Taken the computer case as an example, dynamics modeling and analysis of a thin shell structure is presented in this paper. Optimization is implemented with the goal to reduce the vibration. Four proposals of optimal design are simulated employing the FEM software. Those proposals differ in material, shape, pattern and connectivity. Some especial techniques are used to build the three-dimensional model and to finish the FEM analysis. The dynamics characteristics of the computer case are then investigated in modal analysis based on the dynamics theory. The result is acquired by comparing the modal parameters of those in different proposals. A preferable model takes also the manufacturing and cost into account. The skeleton is universal to dynamics analysis and design of other thin shell structure.

scholarly journals FEM analysis of a new miniplate: stress distribution on the plate, screws and the bone

2012 ◽  
Vol 06 (01) ◽  
pp. 009-015 ◽  
Author(s):  
Didem Nalbantgil ◽  
Murat Tozlu ◽  
Fulya Ozdemir ◽  
Mehmet Oguz Oztoprak ◽  
Tulin Arun
Keyword(s):  
Finite Element ◽  
Cortical Bone ◽  
Three Dimensional ◽  
Fem Analysis ◽  
Force Distribution ◽  
Bone Surface ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

ABSTRACTObjectives: Non-homogeneous force distribution along the miniplates and the screws is an unsolved question for skeletal anchorage in orthodontics. To overcome this issue, a miniplate structure was designed featuring spikes placed on the surface facing the cortical bone. The aim of this study was to examine and compare the force distribution of the newly designed plate-screw systems with the conventional one.Methods: A model of bone surface with 1.5 mm cortical thickness, along with the two newly designed miniplates and a standard miniplate-screw were simulated on the three-dimensional model. 200 g experimental force was applied to the tip of the miniplates and the consequential effects on the screws and cortical bone was evaluated using three-dimensional finite element method.Results: As a result of this finite element study, remarkably lower stresses were observed on the screws and the cortical bone around the screws with the newly designed miniplate when compared with the conventional one.Conclusion: The newly designed miniplate that has spikes was found effective in reducing the stress on and around the screws and the force was distributed more equivalently. (Eur J Dent 2012;6:9-15)

Three-Dimensional FEM Analysis of Sensitive Mechanism of Airflow Level Posture Sensor Based on Thermoelectric Coupling

2011 ◽  
Vol 271-273 ◽  
pp. 211-215
Author(s):  
Ming Ming Ji ◽  
Lin Hua Piao ◽  
Bai Hua Li
Keyword(s):  
Finite Element ◽  
Model Building ◽  
Three Dimensional ◽  
Fem Analysis ◽  
Three Dimensional Model ◽  
Three Dimensional Modeling ◽  
Equation Solving ◽  
Dimensional Modeling ◽  
Element Simulation ◽  
Simulation Based

Using ANSYS program, the finite element simulation based on thermoelectric coupling is conducted by a series of procedures, such as three-dimensional model building of airflow level posture sensor according to the actual size of the proportion, network modifying, loads applying and equation solving. The sensitive mechanism of airflow level posture sensor is explained by finite element method. The numerical results show that compared with two-dimensional modeling, the simulation result of three-dimensional modeling and thermoelectric analysis methods are more comprehensive and accurate, which provides more reliable basis for practical research of the airflow level posture sensor.

scholarly journals Feeding head of relative rotary based on EDEM+FLUENT

2018 ◽  
Vol 10 (7) ◽  
pp. 168781401878482
Author(s):  
Sun Xiaoxia ◽  
Meng Wenjun ◽  
Yuan Yuan
Keyword(s):  
Simulation Analysis ◽  
Three Dimensional ◽  
Dynamics Analysis ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Surface Data ◽  
Fluent Simulation ◽  
Physical Prototype ◽  
Work Mechanism ◽  
Curve Equation

This article takes an efficient feeding head as the research object to study its work mechanism and perform dynamics analysis of the materials in the feeding head. In addition, this article obtains the physical prototype of a three-dimensional model and the feeding surface equation through the surface data of the feeding head and investigates different unfold lines of the feeding surface. In addition, this article recommends a curve equation of the feeding head under different friction coefficients through EDEM + FLUENT simulation analysis and conducts a research on transport and feeding quantity to deduce the equation for the transport quantity of the feeding head. Finally, the verity of the preceding curve equation and transport quantity is confirmed, which has important guiding significance for the feeding head design.

Three-Dimensional FEM Analysis of Effect of Acceleration on Airflow Level Posture Sensor

2011 ◽  
Vol 271-273 ◽  
pp. 220-224
Author(s):  
Ming Ming Ji ◽  
Lin Hua Piao ◽  
Bai Hua Li
Keyword(s):  
Flow Field ◽  
Model Building ◽  
Three Dimensional ◽  
Fem Analysis ◽  
Three Dimensional Model ◽  
Three Dimensional Modeling ◽  
Equation Solving ◽  
Dimensional Modeling ◽  
Element Simulation ◽  
Hermetic Chamber

Using ANSYS-FLOTRAN CFD program, the finite element simulation is conducted by means of a series of procedures, such as three-dimensional model building of airflow level posture sensor, network modifying, loads applying equation solving, the flow field in three-dimensional hermetic chamber of sensitive element of airflow level posture sensor in different acceleration and inclination is Calculated, The numerical results show that for the sensor of airflow level posture sensor, the effect of acceleration and inclination is similar. Both of them can change the flow field of sensor, and will output a corresponding voltage. The simulation result of three-dimensional modeling is more comprehensive and accurate, which provides more reliable basis for practical research of the airflow level posture sensor.

Modeling and Analysis of Heart Left Ventricle in Diastole Using Finite Element

2016 ◽  
Author(s):  
Joshua B. Seidel ◽  
J. Michael Kabo ◽  
Vidya K. Nandikolla
Keyword(s):  
Finite Element ◽  
Left Ventricle ◽  
Three Dimensional ◽  
Wall Stress ◽  
Left Ventricular ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Modeling And Analysis ◽  
End Diastolic Volume ◽  
Tissue Compliance

Finite element is used to analyze the effects of infarct on left ventricular end-diastolic function. The results for the symmetric infarct cases 1–6 demonstrated in this paper correspond to infarct percent by volume of 4, 8, 9, 16, 25 and 51% respectively. Using the developed three-dimensional model, these infarct percent by volume showed a reduction in end-diastolic volume (EDV) of 3, 5, 5, 8, 11, 17 mL respectively. Three natural infarct cases denoted A, B and C was evaluated consisting of 7%, 15% and 50% infarct region by volume respectively. The decrease in EDV for cases A, B and C were 6, 9 and 17 mL. The simulated decrease in EDV for the infarct cases was consistent with patients experiencing decreased tissue compliance. The higher left ventricle (LV) pressure resulted in an increase in wall stress opposite to the infarct for the symmetric and natural infarct cases.

Design and Simulation of the Exoskeleton Robot

2013 ◽  
Vol 791-793 ◽  
pp. 1199-1202
Author(s):  
Chao Wang ◽  
Yu Lin Wang ◽  
Ming Ma
Keyword(s):  
Mechanism Design ◽  
Load Capacity ◽  
Three Dimensional ◽  
Dynamics Analysis ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Exoskeleton Robot ◽  
Wearable Exoskeleton ◽  
Heavy Loads ◽  
Future Work

In order to significantly improve the load capacity of the soldiers and the maneuverability as carrying heavy loads, the mechanism design and simulation of the wearable exoskeleton robot are studied in this paper. Firstly, the mechanism design of the exoskeleton robot is completed and the three-dimensional model of the exoskeleton robot is established. Then, the five-link mathematical model of the exoskeleton robot is established, the dynamics analysis of which is proceed. Finally, through using virtual prototype technology, the walking simulation of the robot is carried out and the results provide a basis for the future work.

FEM Analysis of Engine Crankshaft Static and Dynamic Behaviour Using ANSYS

2011 ◽  
Vol 121-126 ◽  
pp. 3315-3319
Author(s):  
Ze Min Fu
Keyword(s):  
Fatigue Strength ◽  
Dynamic Behaviour ◽  
Three Dimensional ◽  
Fem Analysis ◽  
Analysis Method ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Engine Design ◽  
Set Up ◽  
Engine Crankshaft

By means of FEM using ANSYS, this paper set up a three–dimensional model by using Pro/E for model S195 diesel engine’s crankshaft corresponding to practical conditions . The distortion and stress of the crankshaft was investigated . The fatigue strength of crankshaft was verified under changing load . The rationality of crank stress analysis method, which is in current widely used, was discussed . The model analysis was made for the crankshaft , and provide the valuable theory basis for engine design optimizing and improving .

scholarly journals Application of the finite element method to the design of an ankle orthosis

2021 ◽  
Vol 2130 (1) ◽  
pp. 012013
Author(s):  
D Stefańczak ◽  
J Gajewski ◽  
M Rogala
Keyword(s):  
Finite Element ◽  
Low Cost ◽  
Three Dimensional ◽  
Fem Analysis ◽  
Body Part ◽  
The Body ◽  
Design Stage ◽  
Mechanical Resistance ◽  
Three Dimensional Model ◽  
Element Analysis

Abstract AFO (Ankle-Foot Orthosis), which covers the ankle and foot, protects and supports the ankle joint as well as the structures around it. It contributes to the maintenance of the correct gait cycle. Owing to orthoses, the functional capacity of the body part is significantly improved, and so is the quality of life for the user. Personalized orthoses, which are adapted to the anatomy of the user, are more and more often produced by the additive methods. The use of 3D printing for the manufacturing medical devices is becoming increasingly common due to the low cost of the whole process, short production time and the possibility of the product personalization. One of the stages in manufacturing AFOs with the additive method is to create a three-dimensional model of the orthosis in CAD software. Finite element analysis was performed to assess the mechanical properties of the orthosis. The influence of geometry and the materials used were investigated with FEM analysis software. As a result of structural analysis during the design stage, the assessment of the medical device in terms of its durability and mechanical resistance without putting the user at risk is possible. On the basis of the obtained results, the structure strength was compared.

Three-Dimensional Modeling and Simulation for Airflow Inclination Sensor

2011 ◽  
Vol 268-270 ◽  
pp. 640-644 ◽  
Author(s):  
Ming Ming Ji ◽  
Lin Hua Piao ◽  
Bai Hua Li
Keyword(s):  
Model Building ◽  
Three Dimensional ◽  
Fem Analysis ◽  
Three Dimensional Model ◽  
Three Dimensional Modeling ◽  
Equation Solving ◽  
Dimensional Modeling ◽  
Element Simulation ◽  
Practical Research ◽  
Hermetic Chamber

Using ANSYS-FLOTRAN CFD program, the finite element simulation is conducted by a series of procedures, such as three-dimensional model building of airflow inclination sensor, network modifying, loads applying and equation solving. The flow field caused by the two heats in three-dimensional hermetic chamber of sensitive element of airflow level posture sensor is Calculated, FEM analysis has been obtained. The numerical results show that compared with two-dimensional modeling, the simulation result of three-dimensional modeling are more comprehensive and accurate, which provides more reliable basis for practical research of the airflow inclination sensor.

Flow and Heat Transfer Computations in a Rotating Cavity With Tangential Seal Air Flow

1997 ◽  
Author(s):  
Prabhat Tekriwal
Keyword(s):  
Heat Transfer ◽  
Air Flow ◽  
Three Dimensional ◽  
Thermomechanical Analysis ◽  
Heat Transfer Analysis ◽  
Symmetric Model ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Life Study ◽  
Analysis And Design

Axi-symmetric and three-dimensional CFD models for a rotating open interdisk cavity have been developed to predict flow, heat transfer, windage power loss and cavity air temperatures as a part of the rotor thermomechanical analysis and design life study. The cavity has a tangential (axial and circumferential) seal air flow above it. The rotational Reynolds number is 4.8 × 106 and the non-dimensional seal flow rate is 9.8 × 104. Measured wall temperatures are used as boundary conditions in the model. The axi-symmetric model smears the cavity bolts as 360° continuous rings and therefore ignores the bolts pumping effect. The windage loss calculation from the axi-symmetric model is in good agreement with the experimental data in the literature. The heat transfer coefficient values from the axi-symmetric and three-dimensional models are comparable in most of the regions apart from near the bolts. Also, the three-dimensional model simulates the bolt pumping effects and yields a much higher windage loss value, which in turn raises the cavity air temperature. It is concluded that a three-dimensional model is necessary for an accurate heat transfer analysis.

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