Design, Optimization, and Experiments of Compliant Microgripper

2003 ◽  
Author(s):  
Young Seok Oh ◽  
Woo Ho Lee ◽  
Harry E. Stephanou ◽  
George D. Skidmore
Keyword(s):  
Mass Production ◽  
Low Cost ◽  
Three Dimensional ◽  
Sensory Information ◽  
Silicon On Insulator ◽  
Element Analysis ◽  
Deep Reactive Ion Etching ◽  
Design And Optimization ◽  
Mems Technology ◽  
Large Opening

Recent progress of MEMS technology enables the mass production of microdevices with low cost. However, methods for designing microgrippers and microdevice assembly processes have not been studied extensively. This paper presents the design and optimization of compliant microgripper, and snap-fit based microassembly experiments. A key issue of microassembly is to design a microgripper that is capable of handling and manipulating microparts with positional uncertainty and the lack of sensory information. Topology optimization is used to design compliant microgrippers that can produce a large opening at the tip or a gripper, and Finite Element Analysis (FEA) is performed to evaluate the characteristics of grippers. Compliant microgripper driven by the embedded thermal actuator and snap-connectors were fabricated using deep reactive ion etching (DRIE) process with Silicon On Insulator (SOI) wafer. With a fabricated microgripper and several snap-fits, the assembly of a three dimensional microstructure was successfully demonstrated.

Mechanical and Optimization Analyses for Novel Wound Composite Axial Impeller

2009 ◽  
Author(s):  
Jifeng Wang ◽  
Qubo Li ◽  
Norbert Mu¨ller
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
High Speed ◽  
High Performance ◽  
Low Cost ◽  
Three Dimensional ◽  
Von Mises Stress ◽  
Loading Conditions ◽  
Element Analysis ◽  
Wound Composite

A mechanical and optimal analyses procedure is developed to assess the stresses and deformations of Novel Wound Composite Axial-Impeller under loading conditions particular to centrifuge. This procedure is based on an analytical method and Finite Element Analysis (FEA, commercial software ANSYS) results. A low-cost, light-weight, high-performance, composite turbomachinery impeller from differently designed patterns will be evaluated. Such impellers can economically enable refrigeration plants using water as a refrigerant (R718). To create different complex patterns of impellers, MATLAB is used for creating the geometry of impellers, and CAD software UG is used to build three-dimensional impeller models. Available loading conditions are: radial body force due to high speed rotation about the cylindrical axis and fluid forces on each blade. Two-dimensional plane stress and three-dimensional stress finite element analysis are carried out using ANSYS to validate these analytical mechanical equations. The von Mises stress is investigated, and maximum stress and Tsai-Wu failure criteria are applied for composite material failure, and they generally show good agreement.

Finite Element Analysis of the Nut-Supports Subassembly Based on ANSYS

2012 ◽  
Vol 215-216 ◽  
pp. 847-850
Author(s):  
Shou Jun Wang ◽  
Xing Xiong ◽  
Hong Jie Wang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Reference Data ◽  
Three Dimensional ◽  
Design Parameters ◽  
Weak Links ◽  
Fe Model ◽  
Element Analysis ◽  
Design And Optimization ◽  
Wave Maker

In the condition of alternating impact ,the nut-supports subassembly is analyzed according to uncertainty of design parameters. Firstly, a three-dimensional (3-D) finite element (FE) model of the nut-supports subassembly is built and is meshed,and the constraints and loads are imposed.Secondly,the model of nut-supports was assembled using the software ANSYS to understand the stress distribution and various parts of the deformation of the nut-supports and its weak links in the harmonic forces.Finally,socket head cap screw has not enough pre-load in the condition of alternating impact and will be simplified.It is analyzed and checked whether it is cut or not; which provides the reference data for design and optimization of the wave maker.

scholarly journals Design and Validation of a Single-SOI-Wafer 4-DOF Crawling Microgripper

Micromachines ◽  
2019 ◽  
Vol 10 (6) ◽  
pp. 376 ◽  
Author(s):  
Matteo Verotti ◽  
Alvise Bagolini ◽  
Pierluigi Bellutti ◽  
Nicola Pio Belfiore
Keyword(s):  
Finite Element Analysis ◽  
Rigid Body ◽  
Compliant Mechanism ◽  
Silicon On Insulator ◽  
Element Analysis ◽  
Deep Reactive Ion Etching ◽  
Theoretical Simulation ◽  
Body Model ◽  
Replacement Method ◽  
Rigid Body Model

This paper deals with the manipulation of micro-objects operated by a new concept multi-hinge multi-DoF (degree of freedom) microsystem. The system is composed of a planar 3-DoF microstage and of a set of one-DoF microgrippers, and it is arranged is such a way as to allow any microgripper to crawl over the stage. As a result, the optimal configuration to grasp the micro-object can be reached. Classical algorithms of kinematic analysis have been used to study the rigid-body model of the mobile platform. Then, the rigid-body replacement method has been implemented to design the corresponding compliant mechanism, whose geometry can be transferred onto the etch mask. Deep-reactive ion etching (DRIE) is suggested to fabricate the whole system. The main contributions of this investigation consist of (i) the achievement of a relative motion between the supporting platform and the microgrippers, and of (ii) the design of a process flow for the simultaneous fabrication of the stage and the microgrippers, starting from a single silicon-on-insulator (SOI) wafer. Functionality is validated via theoretical simulation and finite element analysis, whereas fabrication feasibility is granted by preliminary tests performed on some parts of the microsystem.

Collective Dynamics of Arrays of Micro Cantilevers Interacting Through Fringing Electrostatic Fields

2014 ◽  
Author(s):  
Slava Krylov ◽  
Stella Lulinsky ◽  
Bojan R. Ilic ◽  
Inbar Schneider
Keyword(s):  
Dynamic Properties ◽  
Electrostatic Force ◽  
Three Dimensional ◽  
Nonlinear Behavior ◽  
Silicon On Insulator ◽  
Element Analysis ◽  
Mechanical Coupling ◽  
Electrostatic Fields ◽  
Voltage Dependent ◽  
Electrostatic Coupling

We investigate the collective nonlinear behavior of an array of micro cantilevers interacting by fringing electrostatic fields and fabricated of silicon on insulator (SOI) wafer. The interaction is due to the mechanical coupling originated in the flexibility of the anchor and of the electrostatic coupling through voltage-dependent electrostatic force. In the framework of the reduced order model based on the Galerkin decomposition the array is considered as an assembly of single degree of freedom oscillators. The mechanical coupling matrix is extracted using the full scale finite element analysis of the array while the electrostatic force is approximated by a fit build using the three-dimensional numerical simulation. We show numerically and experimentally that large amplitude collective vibrations of the array can be achieved using parametric excitation while the dynamic properties of the array can be efficiently tuned by the applied voltage.

A Multi-Fingered Micromechanism for Coordinated Micro/Nano Manipulation

2005 ◽  
Author(s):  
Sandeep Krishnan ◽  
Laxman Saggere
Keyword(s):  
Silicon On Insulator ◽  
Systematic Design ◽  
Ansys Software ◽  
Excellent Correlation ◽  
Element Analysis ◽  
Deep Reactive Ion Etching ◽  
Baseline Design ◽  
Output Displacement ◽  
Nano Scale ◽  
Theoretical Results

Micromanipulators for coordinated manipulation of micro- and nano-scale objects are critical for advancing several emerging applications such as microassembly and manipulation of biological cells. Most of existing designs for micromanipulators accomplish either primarily microgripping or primarily micropositioning tasks, and relatively, only a very few are capable of accomplishing both microgripping and micropositioning, however, they are generally bulky. This paper presents conceptualization, design, fabrication and experimental characterization a novel micromanipulation station for coordinated planar manipulation combining both gripping and positioning of micro- and nano-scale objects. Conceptually, the micromanipulation station is comprised of multiple, independently actuated, fingers capable of coordinating with each other to accomplish the manipulation and assembly of micron-scale objects within a small workspace. A baseline design is accomplished through a systematic design optimization of each finger maximizing the workspace area of the manipulation station using the optimization toolbox in MATLAB. The device is micromachined on a SOI (silicon-on-insulator) wafer using the DRIE (Deep Reactive Ion Etching) process. The device prototype is experimentally characterized for the output displacement characteristics of each finger for known input displacements applied through manual probing. An excellent correlation between the experimental results and the theoretical results obtained through a finite element analysis in ANSYS software, which validates both the design and the fabrication of the proof-of-the-concept, is demonstrated.

Design and realization of a novel magnetic nutation drive for industry robotic wrist reducer

2017 ◽  
Vol 44 (1) ◽  
pp. 58-63 ◽  
Author(s):  
Ding-jian Huang ◽  
Li-gang Yao ◽  
Wen-jian Li ◽  
Jun Zhang
Keyword(s):  
Low Cost ◽  
Three Dimensional ◽  
Transmission Ratio ◽  
Drive Mode ◽  
Element Analysis ◽  
Compact Structure ◽  
Content Type ◽  
Contact Transmission ◽  
Three Dimensional Finite Element ◽  
Robotic Wrist

Purpose The purpose of this research is to achieve a novel magnetic nutation drive for an industry robotic wrist reducer. Design/methodology/approach A novel magnetic nutation drive is proposed, and the structure and principle of the designed magnetic nutation drive are described in this study. Three-dimensional finite element analysis is used to compute the magnetic and torque of the magnetic nutation drive. Furthermore, a prototype of this novel magnetic nutation drive device is developed with 3D printing technology and tested to verify the feasibility of the proposed structure and principle. Findings The simulation and experimental results indicated that the proposed magnetic nutation drive device could meet the desired specifications, and that this novel magnetic nutation drive device successfully realized the non-contact transmission ratio of 105:1 required for a robotic wrist reducer. Practical implications This novel magnetic nutation drive is low-cost and easy to make and use, and which provides the non-contact transmission ratio of 105:1 required for a robotic wrist reducer. Originality/value For the first time, this research applies the permanent magnet drive technology to nutation drive and puts forward a new non-contact nutation drive mode. The novel drive mode can solve some problems of the traditional mechanical contact nutation drive, such as vibration, friction loss, mechanical fatigue and necessity of lubrication. The proposed non-contact nutation drive device can achieve a high reduction ratio with compact structure and can be suitable for industry application.

scholarly journals Fabrication of Low-Cost Hip Implant using Direct Metal Laser Sintering Technique

2019 ◽  
Vol 8 (4) ◽  
pp. 4544-4547
Keyword(s):  
Finite Element ◽  
Low Cost ◽  
Fibrous Tissue ◽  
Three Dimensional ◽  
Stress Shielding ◽  
Element Analysis ◽  
Hip Implant ◽  
Neck Shaft Angle ◽  
Hip Morphology ◽  
Direct Laser

Total hip replacement (THR) is the most popular surgery been performed in orthopedic surgery due to the inclination of musculoskeletal disorder and the aging population worldwide. However, the implant’s cost-burdened the patient, especially in the ASEAN region. The main objective of this study was to fabricate the low-cost hip implant using direct laser metal sintering (DMLS). The framework starts with the three dimensional of hip anthropometric datasets from computed tomography scanner, followed with the design of hip implant, computational analysis using finite element, and finally fabrication using DMLS technique. The morphological results demonstrated the value of neck-shaft angle was 130.46º, and the femoral head offset of 30.35 mm. The finite element analysis showed strain distribution was 65 MPa for the implant in metaphyseal region and 110 MPa for intact femur under staircase physiological loading which indicated inhibition of stress shielding at medical calcar region, and micromotion was 4.8 µm which prevent the formation of fibrous tissue and promoting osseointegration between implant-bone interfaces. This study proposed the fabrication using the DMLS technique, which produced accurate implant with low-cost, which suits the ASEAN hip morphology that prolongs implant lifetime.

Determination of stress concentration factors for shafts under tension

2020 ◽  
Vol 62 (4) ◽  
pp. 413-421
Author(s):  
Murat Tolga Ozkan ◽  
Fulya Erdemir
Keyword(s):  
Stress Concentration ◽  
Three Dimensional ◽  
Circular Cross Section ◽  
Numerical Data ◽  
Practical Method ◽  
Ann Model ◽  
Element Analysis ◽  
Design And Optimization ◽  
Concentration Factors ◽  
Stress Concentration Factors

Abstract Computer-based design and optimization have become increasingly important in recent years. This paper has investigated the stress concentration factors (SCF) Kt for shoulder filleted shafts with a hole and without a hole. This study contains two types of shoulder filleted shafts, i. e., a stepped bar of circular cross section with shoulder filleted and a tube with filleted shafts under tension stresses. Investigations on SCF that have been carried out in experimental and theoretical studies, were updated and validated for 2 types of shafts. The charts have been converted into numerical value using high precision computer techniques. Dimensional ratios and SCF were determined using previous work charts. This study determines maximum stresses for shoulder filleted shafts by three dimensional finite element analysis (FEA) and artificial intelligence techniques. A set of SCF charts was converted into numerical values and this data was organized and stored in an Excel file. ANSYS models were created and applied the boundary conditions on the models. And also mesh optimizations were performed. Artificial neural networks (ANN) models were designed using previously collected and verified data. Previous works, ANSYS and ANN results were compared to each other. As a result, ANN model and chart results show a good agreement. The usage of ANN model does not require any mathematical formulae or converting the numerical data action for determining the Kt result for shafts. ANN model usage was identified as a very useful and practical method.

Optimal Design and Simulation of a Cross-Plane Micro-Thermoelectric Generator

2012 ◽  
Vol 503 ◽  
pp. 240-243 ◽  
Author(s):  
Xiao Liang Zhu ◽  
De Sheng Li ◽  
Ben Dong Liu ◽  
Jiang Zhe
Keyword(s):  
Thermoelectric Generator ◽  
Low Cost ◽  
Saturated Calomel Electrode ◽  
Element Analysis ◽  
Flexible Polymer ◽  
Mems Technology ◽  
In Series ◽  
Micro Thermoelectric Generator ◽  
P Type ◽  
Releasing Process

This paper presents a new way to design a low-cost micro-thermoelectric generator (μ-TEG) which can be fabricated by using electrochemical and MEMS technology. The overall dimension of the μ-TEG is about 13mm × 13mm × 0.4mm, which contains 128 p- and n-type pairs of semiconductors connected electrically in series and thermally in parallel. The p-type antimony telluride (Sb2Te3) and n-type bismuth telluride (Bi2Te3) with an optimal thickness of 20μm were designed to deposit in a flexible polymer mold formed by photolithographic patterning of Polyimide (PI) with a three electrode configuration. Simulations of the thermocouple with PI mold were carried on, using finite element analysis. The analysis shows the possibility to achieve 3.5 mV while the difference in temperature is 10K and the thickness of the silicon substrate is 400μm, which reveals that the output power of the thermocouple without releasing process is only 4% lower than the one with the releasing process. Therefore the PI mold is not removed, considering the potential for easier fabrication and lower cost. The deposition parameters were also studied and optimized for the best thermoelectric performance. In our experiments, the n- and p-type semiconductors could be obtained when the voltage and current are around 50mV versus saturated calomel electrode (SCE) and 40 mA, respectively.

scholarly journals Locating Ultrasonic Signals Employing MEMS-On-Fiber Sensors

Sensors ◽  
2019 ◽  
Vol 19 (17) ◽  
pp. 3696
Author(s):  
Wenrong Si ◽  
Chenzhao Fu ◽  
Haoyong Li ◽  
Jiaming Lv ◽  
Chaoyu Xiong ◽  
...  
Keyword(s):  
High Performance ◽  
Small Volume ◽  
Low Cost ◽  
Three Dimensional ◽  
Directional Sensitivity ◽  
Fiber Sensors ◽  
Ultrasonic Signals ◽  
Accurate Localization ◽  
Mems Technology ◽  
Accurate Position

Sound sensing finds wide applications in various fields, such as underwater detection, structural health monitoring, and medical diagnosis, to name just a few. Based on our previously developed MEMS-on-fiber sensors, showing the advantages of low cost, small volume, and high performance, a three-dimensional ultrasonic localization system employing four such sensors was established in this work. A time difference of arrival (TDOA) algorithm was utilized to analyze the acquired data and then calculate the accurate position of the ultrasonic signal source. Plenty of practical measurements were performed, and the derived localization deviation in the region of 2 m × 2 m × 1 m was about 2–5 mm. Outside this region, the deviation tended to increase due to the directional sensitivity existing in these sensors. As a result, for a more accurate localization requirement, more sensing probes are needed in order to depict a completely suitable application situation for MEMS technology.

Sign in / Sign up

Export Citation Format

Share Document