Analysis and Stress Optimization Design of an S-Shaped Micro Spring

2010 ◽  
Vol 97-101 ◽  
pp. 2500-2504
Author(s):  
Li Shun Li ◽  
Xiang De Meng ◽  
Hong Xun Li
Keyword(s):  
Optimization Design ◽  
Maximum Stress ◽  
Mechanical Performance ◽  
Fem Simulation ◽  
Micro Electro Mechanical System ◽  
The Finite Element Method ◽  
Mems Technology ◽  
Stress Optimization ◽  
The Difference ◽  
Spring Coefficient

The stress distribution of an S-shaped micro spring fabricated by the micro-electro-mechanical-system (MEMS) technology was analyzed by the finite-element method (FEM) using ANSYS software, which showed that the stress concentration is located in the inner corner of the turning round. To reduce the maximum stress but not change the spring coefficient, an optimization S-shaped micro spring with the slope cross section was designed. The width of one end of the turning round is increased from the original 80μm to 100μm, while the other is decreased from 80μm to 21.5μm. The spring coefficient formula of the optimization S-shaped micro spring was calculated out by the Castigliano second law, and the difference between the formula and the FEM is 2.7%. At the same time the FEM simulation shows that the maximum stress of the optimization S-shaped micro spring can be reduced by 32.7% while the spring coefficient is the same comparing with the primary S-shaped micro spring, which shows that the mechanical performance of the optimization S-shaped micro spring is better than that of the primary S-shaped micro spring.

A Study on Multidisciplinary Optimization of an Axial Compressor Blade Based on Evolutionary Algorithms

2012 ◽  
Vol 134 (5) ◽  
Author(s):  
Chang Luo ◽  
Liming Song ◽  
Jun Li ◽  
Zhenping Feng
Keyword(s):  
Evolutionary Algorithms ◽  
Optimization Design ◽  
Maximum Stress ◽  
Mechanical Performance ◽  
Axial Compressor ◽  
Optimization Method ◽  
Compressor Blade ◽  
Multidisciplinary Optimization ◽  
Frequency Constraint ◽  
Isentropic Efficiency

An aerodynamic single disciplinary optimization and an aerodynamic/structural multidisciplinary optimization of an axial compressor blade are performed using evolutionary algorithms in this paper. The blade is optimized for maximizing its isentropic efficiency in the aerodynamic single disciplinary optimization. The isentropic efficiency of the optimum blade obtained from the aerodynamic single disciplinary optimization is 1.65% higher than that of the reference blade, however, the mechanical performance analysis indicates that it has a higher stress distribution and does not satisfy the vibration frequency constraint. In the multidisciplinary optimization, the maximum of the isentropic efficiency and the minimization of the maximum stress are selected as the design objectives. The analysis results indicate that the method of dealing with minimization of the maximum stress as a design objective is proper and that the presented multiobjective and multidisciplinary optimization method is more suitable for the optimization design of a real turbomachinery blade than the traditional heuristic aerodynamic-structural iteration.

A Case Study of Conceptual Design Analysis of Stove Brackets Using Finite Element Method

2008 ◽  
Author(s):  
Diego Va´zquez ◽  
Hugo Medelli´n ◽  
Antonio Ca´rdenas ◽  
Alonso de la Garza
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Experimental Analysis ◽  
Mechanical Performance ◽  
Fem Simulation ◽  
Production Costs ◽  
The Finite Element Method ◽  
Design Change ◽  
Element Method

Advanced engineering techniques for analysis are modern tools used for companies to enhance the design and manufacturing cycles of new or existing products. Finite element method has become one of the most used tools in the design process of products. This paper presents a case study regarding a design change of the brackets that support the gas jet in stoves. Using the finite element method, the mechanical performance of the existing brackets is compared with the performance of the new proposed bracket. This comparison is used to evaluate the feasibility of carrying out the design change. The benefit of the new design is a reduction of materials, production costs and production times. Experimental analysis of the materials and the validation of the finite element solutions were also performed. The results of the experimental analysis and FEM simulation are discussed and presented. Finally, the performance of the existing and the new brackets under several load cases is compared and the results suggest that the product design change is feasible.

Design and Simulation of Piezoelectric Micro-Cantilever Ultrasonic Transducers for Audio Directional Loudspeakers

2008 ◽  
Author(s):  
Teng Ma ◽  
Chenguang Cai ◽  
Limei Xu ◽  
Leon Xu ◽  
Xia Wang ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Mobile Communication ◽  
Mechanical Performance ◽  
Micro Electro Mechanical System ◽  
Ultrasonic Transducers ◽  
Design Parameters ◽  
The Finite Element Method ◽  
Communication Devices ◽  
Micro Cantilever

This paper presents a piezoelectric multilayered microcantilever structure as a micro-electro-mechanical system (MEMS) transducer. The proposed micro-transducer is designed for novel audio directional loudspeaker for mobile communication devices. To obtain optimum design parameters and predict the cantilever performance before actual fabrication, the mechanical and electro-mechanical performance was simulated by the finite element method and further validated with theoretical calculation. Finally the fabrication process steps are proposed.

scholarly journals Statics Analysis and Optimization Design for a Fixed-Guided Beam Flexure

2020 ◽  
Vol 4 (2) ◽  
pp. 125
Author(s):  
Ngoc Thoai Tran ◽  
Thanh-Phong Dao
Keyword(s):  
Optimization Design ◽  
Original Work ◽  
Maximum Stress ◽  
The Finite Element Method ◽  
Ratchet Mechanism ◽  
Creative Commons ◽  
Body Model ◽  
Rigid Body Model ◽  
Prototype Design ◽  
Open Access Article

The ratchet mechanism has been used to ensure moving in one direction of rotation, i.e. either clockwise or counterclockwise. This mechanism is designed based on fixed-guided beam flexures to reduce friction and improves accuracy compared to the traditional mechanism. This paper presents a static analysis and parameter optimization for the fixed-guided beam flexures via using the pseudo-rigid-body model and a fmincon algorithm. The Finite Element Method (FEM) of the fixed-guided beam also has been used to verify the maximum stress and the x-direction displacement. Modified pseudorigid-body model (M-PRBM) is also applied to significantly enhance the accuracy of the maximum stress value. The results show that the averaged errors of maximum stress between MPRBM and FEM are 3.48% for aluminum, and less than 10.9% for titanium, carbon steel, and alloy steel. From the obtained results, the MPRBM is good for prototype design and fabrication of the ratchet mechanism in the future. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium provided the original work is properly cited.

scholarly journals Design and Simulation of Platinum Micro Heater for VOC sensing Applications

2019 ◽  
Vol 9 (2S3) ◽  
pp. 145-148
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Gas Sensors ◽  
Temperature Effects ◽  
Fem Simulation ◽  
Micro Electro Mechanical System ◽  
Mems Devices ◽  
Sensing Applications ◽  
Volatile Organic ◽  
Mems Technology

Micro electro-mechanical system (MEMS) technology is flourishing the development of various sensors. Conventionally MEMS devices have been extensively used for upward performance of gas sensors over a period of time. This paper presents the designing of meander shaped microheater with the commercial FEM tool is used for simulation. Microheater is designed for application of VOC sensing applications. As the volatile organic compounds are to be vaporized a microheater is used. The geometric aspects of the microheater state the temperature effects on the VOC’s.Thus the dimensions were optimized for uniform distribution of heat across the surface. It was observed from the analytical analysis and FEM simulation that at 2um thickness, Microheater was able to distribute the heat uniformity across the surface

scholarly journals Ultrafine Aerosol Particle Sizer Based on Piezoresistive Microcantilever Resonators with Integrated Air-Flow Channel

Sensors ◽  
2021 ◽  
Vol 21 (11) ◽  
pp. 3731
Author(s):  
Maik Bertke ◽  
Ina Kirsch ◽  
Erik Uhde ◽  
Erwin Peiner
Keyword(s):  
Mass Concentration ◽  
Limit Of Detection ◽  
A Priori ◽  
Micro Electro Mechanical System ◽  
Single Chip ◽  
Air Stream ◽  
Mems Technology ◽  
Clean Air ◽  
Particle Sizer ◽  
Ultrafine Aerosol

To monitor airborne nano-sized particles (NPs), a single-chip differential mobility particle sizer (DMPS) based on resonant micro cantilevers in defined micro-fluidic channels (µFCs) is introduced. A size bin of the positive-charged fraction of particles herein is separated from the air stream by aligning their trajectories onto the cantilever under the action of a perpendicular electrostatic field of variable strength. We use previously described µFCs and piezoresistive micro cantilevers (PMCs) of 16 ng mass fabricated using micro electro mechanical system (MEMS) technology, which offer a limit of detection of captured particle mass of 0.26 pg and a minimum detectable particulate mass concentration in air of 0.75 µg/m3. Mobility sizing in 4 bins of a nebulized carbon aerosol NPs is demonstrated based on finite element modelling (FEM) combined with a-priori knowledge of particle charge state. Good agreement of better than 14% of mass concentration is observed in a chamber test for the novel MEMS-DMPS vs. a simultaneously operated standard fast mobility particle sizer (FMPS) as reference instrument. Refreshing of polluted cantilevers is feasible without de-mounting the sensor chip from its package by multiply purging them alternately in acetone steam and clean air.

Biomechanical comparison of the Lim/Tsai tendon repair with a modified method using a single looped suture

2017 ◽  
Vol 42 (9) ◽  
pp. 915-919 ◽  
Author(s):  
Min Kai Chang ◽  
Yoke Rung Wong ◽  
Shian Chao Tay
Keyword(s):  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Mechanical Performance ◽  
Tendon Repair ◽  
Original Method ◽  
Flexor Digitorum Profundus ◽  
Loading Test ◽  
Modified Method ◽  
Cycle Loading ◽  
The Difference

The Lim/Tsai tendon repair technique has been modified clinically to achieve a 6-strand repair using a single looped suture with one extratendinous knot. We compared biomechanical performance of the original and modified methods using 20 porcine flexor digitorum profundus tendons. The ultimate tensile strength, load to 2 mm gap force, mode of failure, and time taken to repair each tendon were recorded during a single cycle loading test in 10 tendons with each repair method. We found that despite having the same number of core strands, the single looped suture modified Lim/Tsai technique possessed significantly greater ultimate tensile strength and load to 2 mm gap force. Also, less repair time was required. We conclude that the modified 6-strand repair using a single looped suture has better mechanical performance than the original method. The difference likely was due to the changes in locations of the knots and subsequent load distribution during tendon loading.

Study and Simulate the Air Pollution Based on the Finite Difference Method

2012 ◽  
Vol 518-523 ◽  
pp. 2820-2824
Author(s):  
Yi Ni Guo ◽  
Yan Zhang ◽  
Jian Wang ◽  
Ye Huang
Keyword(s):  
Finite Element Method ◽  
Air Pollution ◽  
Finite Difference ◽  
Finite Difference Method ◽  
Difference Method ◽  
The Finite Element Method ◽  
Liquid Diffusion ◽  
Continuous Problems ◽  
The Finite Difference Method ◽  
The Difference

The finite difference method that is the finite element method is used to solve the plane continuous problems. In this article, the theory and method of the finite difference method, as well as the application on the boundary problem are introduced. By analyzing the potential flew field equation and liquid diffusion equation, they are discreted using the difference method and the numerical analysis under certain boundary condition is conducted. In air pollution, the smoke in the diffusion is typical planar continuous problems. In this paper, the finite difference method is used to analyse and simulate the spread of the smoke.

Thermal Bubble Dynamics Under the Effect of Acoustic Vibration

2009 ◽  
Author(s):  
Xiaopeng Qu ◽  
Huihe Qiu
Keyword(s):  
Heat Transfer ◽  
Acoustic Field ◽  
Vapor Bubble ◽  
Boiling Heat Transfer ◽  
High Speed ◽  
Bubble Dynamics ◽  
Acoustic Vibration ◽  
Micro Electro Mechanical System ◽  
Mems Technology ◽  
Enhanced Boiling

The effect of acoustic field on the dynamics of micro thermal bubble is investigated in this paper. The micro thermal bubbles were generated by a micro heater which was fabricated by standard Micro-Electro-Mechanical-System (MEMS) technology and integrated into a mini chamber. The acoustic field formed in the mini chamber was generated by a piezoelectric plate which was adhered on the top side of the chamber’s wall. The dynamics and related heat transfer induced by the micro heater generated vapor bubble with and without the existing of acoustic field were characterized by a high speed photograph system and a micro temperature sensor. Through the experiments, it was found that in two different conditions, the temperature changing induced by the micro heater generated vapor bubble was significantly different. From the analysis of the high speed photograph results, the acoustic force induced micro thermal bubble movements, such as forcibly removing, collapsing and sweeping, were the main effects of acoustic enhanced boiling heat transfer. The experimental results and theoretical analysis were helpful for understanding of the mechanisms of acoustic enhanced boiling heat transfer and development of novel micro cooling devices.

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