Bio-Inspired Fast Actuation by Mechanical Instability of Thermoresponding Hydrogel Structures

2016 ◽  
Vol 83 (7) ◽  
Author(s):  
Xuxu Yang ◽  
Guorui Li ◽  
Tingyu Cheng ◽  
Qian Zhao ◽  
Chunxin Ma ◽  
...  
Keyword(s):  
Drug Delivery ◽  
Finite Element ◽  
Control System ◽  
Structural Design ◽  
Multilayered Structure ◽  
Mechanical Instability ◽  
Triggering Mechanism ◽  
Element Simulation ◽  
Ca Alginate ◽  
Poly Acrylamide

Inspired by natural plants, thermoresponding hydrogel (TRH) structures have been designed to trigger mechanical instability with fast actuation. Tough Ca-alginate/poly(N-isopropylacrylamide) (PNIPAM) hydrogel has been synthesized by the hybrid of physically cross-linked alginate and covalently cross-linked PNIPAM. The tough Ca-alginate/PNIPAM hydrogel exhibits 30 kPa of elastic modulus, 280 J/m2 of fracture energies, and fivefold of uniaxial stretch. A multilayered structure made of (Ca-alginate/PNIPAM)/(Ca-alginate/poly (acrylamide)) hydrogels demonstrate fast actuation induced by mechanical instability. A finite-element simulation model is developed to investigate the deformation and to guide the structural design of the hydrogels. The instability-triggering mechanism can enhance the actuation performances of hydrogel structures in applications, such as drug delivery, microfluid control system, and soft biomimetic robotics.

Modeling and Simulation of Controlled Manipulation by AFM Nano Robot

2011 ◽  
Vol 110-116 ◽  
pp. 3688-3695 ◽  
Author(s):  
Ali Kafash Hoshiar ◽  
Mohamad Reza Khalili ◽  
Mahmood Hashemi Nejad ◽  
Hafez Raeisi Fard
Keyword(s):  
Finite Element ◽  
Control System ◽  
Process Control ◽  
Control Algorithm ◽  
State Space Model ◽  
Force Transducer ◽  
Process Control System ◽  
Space Model ◽  
Element Simulation ◽  
Recent Developments

In this article a model to describe relation between AFM cantilever’s deformation and force (as a force transducer) is developed. Furthermore a state space model is used to find suitable feedback control. A model which relates force and deformation is described. To verify a Finite element simulation is applied and a control algorithm for manipulation purpose is found. Moreover based on nature of the process control system is designed. Due to recent developments in AFM nanorobot applications in biotechnology and manufacturing nanostructures, understanding of cantilever’s response and process control have received great importance.

Static Characteristics of Micro Disc Magneto Electric Generator – Simulation and Experiment

2013 ◽  
Vol 365-366 ◽  
pp. 356-359
Author(s):  
Lin Du ◽  
Geng Chen Shi ◽  
Jing Jing Zhao
Keyword(s):  
Finite Element ◽  
Structural Design ◽  
Experimental Result ◽  
Static Characteristics ◽  
Element Analysis ◽  
Electric Generator ◽  
Design And Optimization ◽  
Element Simulation ◽  
Simulation And Experiment ◽  
3D Software

Maxwell 3D software of finite-element analysis in electromagnetic fields is used to model and simulate the micro disc magneto electric generator. Distribution characteristics of magnetic induction are required and theoretical analysis and calculation is presented. Error between the simulation result and experimental result is about 6% which verify the rationality and accuracy of finite-element simulation. It can be used to guide the structural design and optimization of this type of generator.

scholarly journals A Theoretical Method for Structural Design and Analysis of Crankshafts

2015 ◽  
Vol 7 (3) ◽  
Author(s):  
Sergio Baragetti
Keyword(s):  
Finite Element ◽  
Theoretical Model ◽  
Structural Design ◽  
Finite Element Modelling ◽  
Theoretical Method ◽  
Simple Theoretical Model ◽  
Element Simulation ◽  
Strain Behaviour ◽  
Numerical Finite Element ◽  
Theoretical Procedure

The crankshaft is the crucial mechanical component in many machines and engines and its fatigue assessment is often very time consuming and expensive. The machine designer usually needs a simple theoretical model that would allow choosing the best material and the dimensions of the component in a quick and reliable way. The numerical finite element simulation of crankshafts should follow the first step of theoretical dimensioning with the aim of evaluating the stress-strain behaviour at the notched area to verify the component against fatigue failure. The development of an intermediate theoretical model would prove effective to reduce the time needed to reach a second approximation design of the crankshaft. The aim of this paper is to give the designer a theoretical procedure that allows determining the strain and stress state for verification of crankshafts. The model was developed in the case of crankshafts with two connecting rods and validated by means of numerical finite element modelling and analysis.

scholarly journals A Mechanical Modelling and Simulation Method for Resolving PIM Problems in Antennas

Sensors ◽  
2021 ◽  
Vol 22 (1) ◽  
pp. 294
Author(s):  
Chen Chen ◽  
Yangyang Gu
Keyword(s):  
Finite Element ◽  
Product Development ◽  
Structural Design ◽  
Nonlinear Distortion ◽  
Simulation Method ◽  
Design Phase ◽  
Root Cause ◽  
Element Simulation ◽  
Mechanical Modelling ◽  
The Stability

Passive intermodulation (PIM) generated from antennas is a nonlinear distortion phenomenon and causes serious problems to communication quality. Traditional radio frequency (RF) solutions focus on testing the final product to find the PIM source. However, it cannot solve the stability of PIM after the antenna is vibrated. This paper introduces a new method to improve the stability of PIM in the design phase. By studying the mechanism of PIM generation, a simulation method is proposed in this paper by applying mechanical finite element simulation and simulating the structural design of the device under test. Then, the stress at the PIM source is reduced, thereby the PIM stability of the product is improved. This paper adopts this method by studying a typical product, finding the root cause that affects the product PIM magnitude and stability, and optimizing its design. The PIM value of the new scheme is stable by making a prototype and testing. The method provided in this article can effectively improve product development efficiency and assist designers in avoiding the risks of PIM before the product’s manufacturing.

The Design and Finite Element Analysis of the Tool in Turning the Inner Ring Groove of a Large Cylindrical Shell

2012 ◽  
Vol 500 ◽  
pp. 174-179 ◽  
Author(s):  
Ji Jun Zhang ◽  
Xian Li Liu ◽  
Geng Huang He ◽  
Tian Xiang Liu ◽  
Xin Jiang Cheng
Keyword(s):  
Finite Element ◽  
Cylindrical Shell ◽  
Structural Design ◽  
Theoretical Basis ◽  
Natural Frequencies ◽  
Simulation Analysis ◽  
Ring Groove ◽  
Element Analysis ◽  
Static And Dynamic Analysis ◽  
Element Simulation

In this paper, for turning the inner ring groove of a large nuclear cylindrical shell, based on requirements of machining condition, the matching tool assembled are designed. Based on the platform of finite element simulation analysis, the deformation and stress analysis of the tools overall structures are carried out, this provides a theoretical basis for the static strength evaluation of the tools. Through the dynamics modal analysis of the tools, natural frequencies and modal shapes of the tools are obtained, this provides a theoretical basis to evaluate the dynamic characteristics of the tools, in particularly, the resonance characteristics. Through static and dynamic analysis, the reasonableness of structural design of the tools is evaluated theoretically.

Analysis of magnetic force and dynamic characteristic for non-contact permanent magnet linear drive device

2020 ◽  
Vol 64 (1-4) ◽  
pp. 1337-1345
Author(s):  
Chuan Zhao ◽  
Feng Sun ◽  
Junjie Jin ◽  
Mingwei Bo ◽  
Fangchao Xu ◽  
...  
Keyword(s):  
Finite Element ◽  
Permanent Magnet ◽  
Dynamic Characteristic ◽  
Driving Force ◽  
Magnetic Circuit ◽  
Response Speed ◽  
Computation Method ◽  
Element Analysis ◽  
Element Simulation ◽  
The Relationship

This paper proposes a computation method using the equivalent magnetic circuit to analyze the driving force for the non-contact permanent magnet linear drive system. In this device, the magnetic driving force is related to the rotation angle of driving wheels. The relationship is verified by finite element analysis and measuring experiments. The result of finite element simulation is in good agreement with the model established by the equivalent magnetic circuit. Then experiments of displacement control are carried out to test the dynamic characteristic of this system. The controller of the system adopts the combination control of displacement and angle. The results indicate that the system has good performance in steady-state error and response speed, while the maximum overshoot needs to be reduced.

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