scholarly journals Optimization Design Strategy of Electroadhesive Devices with Interdigital Electrodes Based on the Multiparameters Theoretical Model

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Shuang Lai ◽  
Jintao Zhang ◽  
Yaxuan Yan ◽  
Huahua Yu
Keyword(s):  
Theoretical Model ◽  
Optimization Design ◽  
Design Strategy ◽  
Adhesive Force ◽  
Target Object ◽  
Interdigital Electrodes ◽  
3D Simulation Model ◽  
Dimensional Parameters ◽  
Overall Performance ◽  
Practical Constraints

Electroadhesion is an adhesion mechanism applying high voltage to generate adhesive force. The electroadhesion system can generate and maintain adhesive force on almost any object, solving the challenge of handling irregular and rough surface objects as well as fragile objects. The electroadhesive pad is a key component of the electroadhesion system for interacting with the target object. By optimizing the design of the electroadhesive pad, the electroadhesion system provides greater adhesive force and achieves better adhesion. In this study, a multiparameter theoretical model including the dimensional parameters of the electroadhesive pad has been developed and an optimization design strategy for specific applications has been proposed. By considering both the key parameters influencing the electroadhesive force and the practical constraints of equipment and materials, this strategy allows the optimization design methods of electroadhesive pads to be further extended to applications. The influence of each parameter on the optimization results has been evaluated by calculating and comparing the optimized values under different conditions, and it has been demonstrated that the size of the pad also has an effect on the optimized values. A 3D simulation model has been established to simulate the effect of electroadhesion, and the accuracy of the optimization results has been verified by comparing the theoretical and simulation results. An application example has been performed and the results have shown that the structure of the electroadhesive pad can be optimized by using this strategy, thus maximizing the generated electroadhesive force and improving the overall performance of the electroadhesion system.

Dimensional Design on the Six-Cable Driven Parallel Manipulator of FAST

2011 ◽  
Vol 133 (11) ◽  
Author(s):  
Xiaoqiang Tang ◽  
Rui Yao
Keyword(s):  
Radio Telescope ◽  
Parallel Manipulator ◽  
Optimization Design ◽  
Design Method ◽  
Guizhou Province ◽  
Large Span ◽  
Similarity Model ◽  
Dimensional Parameters ◽  
Set Up ◽  
Design Result

China is now building the world’s largest single dish radio telescope in Guizhou province, which is called Five-hundred meter Aperture Spherical radio Telescope (FAST). The main purpose of this paper is to present an effective dimensional design method on the six-cable driven parallel manipulator of FAST. Sensitivity design method is adopted for the six-cable driven parallel manipulator of FAST. Cable has the capability to bear tension but not compression, so that cable driven parallel manipulator may not be controlled as expected if tension of one cable is small or zero. Therefore, for dimensional design of the six-cable driven parallel manipulator, three functions to evaluate tension performance were proposed. The tension performance functions can reflect the uniformity of cable tension and controllability of the six-cable driven parallel manipulator. According to the sensitivity design method and tension performance evaluating functions, a set of optimized dimensional parameters is calculated for constructing the six-cable driven parallel manipulator of FAST. In order to verify the optimization design result, a similarity model of the six-cable driven parallel manipulator was set up in Beijing. A serial of experiments shows that tension performance of the six-cable driven parallel manipulator satisfies the system’s requirement. More importantly, it provides a theoretical reference for further study on dimensional design of a cable driven parallel manipulator with large span.

Interactive Multiobjective Optimization Design Strategy for Decision Based Design

1999 ◽  
Author(s):  
Ravindra V. Tappeta ◽  
John E. Renaud
Keyword(s):  
Multiobjective Optimization ◽  
Optimization Design ◽  
Optimization Procedure ◽  
Design Strategy ◽  
Test Problems ◽  
Multi Objective Optimization ◽  
Original Algorithm ◽  
Multi Objective ◽  
Local Preference ◽  
Preference Functions

Abstract This research focuses on multi-objective system design and optimization. The primary goal is to develop and test a mathematically rigorous and efficient interactive multi-objective optimization algorithm that takes into account the Decision Maker’s (DM’s) preferences during the design process. An Interactive Multi-Objective Optimization Procedure (IMOOP) developed in [12] has been modified in this research to include the DM’s local preference functions in an Iterative Decision Making Strategy (IDMS). This enhanced multiobjective optimization procedure called the interactive MultiObjective Optimization Design Strategy (iMOODS) provides the DM with a formal means for efficient design exploration around a given Pareto point. The use of local preference functions allows the original algorithm [12] to be modified such that the second order Pareto surface approximation is more accurate in the preferred region of the Pareto surface. The iMOODS has been successfully applied to two test problems. The first problem consists of a set of simple analytical expressions for the objectives and constraints. The second problem is the design and sizing of a high-performance and low-cost ten bar structure that has multiple objectives. The results indicate that the class functions are effective in capturing the local preferences of the DM. The Pareto designs that reflect the DM’s preferences can be efficiently generated within IDMS.

Diagnosis of Rolling-Element Bearings Failure by Localized Electrical Current Between Track Surfaces of Races and Rolling-Elements

2002 ◽  
Vol 124 (3) ◽  
pp. 468-473 ◽  
Author(s):  
Har Prashad
Keyword(s):  
Theoretical Model ◽  
Electrical Current ◽  
Rolling Element Bearing ◽  
Rolling Element Bearings ◽  
Bearing Failure ◽  
Cause Analysis ◽  
Rolling Element ◽  
Rolling Elements ◽  
Dimensional Parameters ◽  
Element Bearing

The diagnosis and cause analysis of rolling-element bearing failure have been well studied and established in literature. Failure of bearings due to unforeseen causes were reported as: puncturing of bearings insulation; grease deterioration; grease pipe contacting the motor base frame; unshielded instrumentation cable; the bearing operating under the influence of magnetic flux, etc. These causes lead to the passage of electric current through the bearings of motors and alternators and deteriorate them in due course. But, bearing failure due to localized electrical current between track surfaces of races and rolling-elements has not been hitherto diagnosed and analyzed. This paper reports the cause of generation of localized current in presence of shaft voltage. Also, it brings out the developed theoretical model to determine the value of localized current density depending on dimensional parameters, shaft voltage, contact resistance, frequency of rotation of shaft and rolling-elements of a bearing. Furthermore, failure caused by flow of localized current has been experimentally investigated.

Study on Hydraulic Circuit Simulation Based on MSC·EASY5 for the Arm of Excavator

2011 ◽  
Vol 291-294 ◽  
pp. 2281-2286
Author(s):  
Li Rong Wan ◽  
Yun Qing Gong ◽  
Cheng Long Wang
Keyword(s):  
Performance Analysis ◽  
Hydraulic System ◽  
Optimization Design ◽  
Circuit Simulation ◽  
New Product ◽  
Hydraulic Cylinder ◽  
Hydraulic Circuit ◽  
Graphical Modeling ◽  
Simulation Based ◽  
Overall Performance

In this paper, a hydraulic excavator is used as an example, and a model of the hydraulic circuit of the excavator arm is established using the graphical modeling method of EASY5. Through the simulation and analysis of the results, it can be seen that the simulation results can accurately simulate the dynamic characteristics of actual hydraulic circuit, and show the variation of the pressure in the hydraulic cylinder chambers. It not only provides a basis for the system performance analysis and the further improvement, but also provides a new method for the optimization design and overall performance analysis of the engineering machinery hydraulic system. And it also provides a new idea of design for the development of new product.

Optimization Design of a Framework for an Infrared Seeker

2013 ◽  
Vol 748 ◽  
pp. 350-353
Author(s):  
Tao Wang ◽  
Ming Zhao ◽  
Hong Guang Jia
Keyword(s):  
Production Process ◽  
Environmental Conditions ◽  
Optimization Design ◽  
Design Strategy ◽  
Infrared Seeker ◽  
Fem Method ◽  
Application Requirements

Seeker, whose performance severely affects the accuracy of guidance, plays an important role in guidance, just like the eyes of missiles. To design a seeker meeting the application requirements, multiple environmental conditions have to be taken in to consideration, such as the environments of production process, experiments, transportation and launching. This paper introduces a FEM method based optimization design strategy and a case study of mechanical framework optimization design for an infrared seeker as demonstration. The result of the design example seems positive and offers a proof of the effectiveness of the proposed method.

Study on Balance Simulation of Milling Tool Handle in High Speed Machining

2013 ◽  
Vol 397-400 ◽  
pp. 384-387
Author(s):  
Yun Na Xue ◽  
Li Xue ◽  
Guo Sheng Su
Keyword(s):  
High Speed ◽  
Optimization Design ◽  
Rotation Axis ◽  
Dynamic Performance ◽  
Center Of Mass ◽  
Balance Model ◽  
Static Balance ◽  
Balance Performance ◽  
Dimensional Parameters ◽  
Balance Structure

The balance performance of the tool handle influences the machining quality. Using the tool of the sensitivity analysis, the feasibility analysis and the optimization design in Pro/e software, by reasonably selecting the dimensional parameters of the balance structure, the distance between the center of mass and the rotation axis can be zero in order to achieve the static balance. After the dynamic simulation, the dynamic performance states that the static balance model is not fully dynamic balanced.

An Optimization Framework for PBCF Energy Saving Devices

2018 ◽  
Author(s):  
Stefano Gaggero ◽  
Diego Villa
Keyword(s):  
Energy Saving ◽  
Optimization Design ◽  
Design Strategy ◽  
Geometrical Parameters ◽  
High Fidelity ◽  
Propulsive Efficiency ◽  
Optimization Framework ◽  
Parametric Description ◽  
Reliable Design ◽  
Dynamics Analyses

The need of continuously improving propulsive efficiency encourages the development of energy saving devices, the understanding of their underlying principles and the validation of their effectiveness. In this work, a design by optimization of Propeller Boss Cap Fin (PBCF) devices is carried out using Computational Fluid Dynamics analyses. RANS calculations (by the OpenFOAM library) are applied in an automatic optimization design approach involving a parametric description of the main characteristics of PBCFs. The optimization is carried out with multiple purposes: identify a reliable design strategy necessary to customize the PBCF geometry based on the propeller functioning and evaluate the influence of alternative configurations and of main geometrical parameters in achieving higher efficiency. The use of high-fidelity RANS calculations confirm that the decrease of the hub vortex strength, the reduction of the net torque and the influence of the additional fins on blades performance are the major contributors to the increase of efficiency. Results of detailed analyses of optimal PBCF configurations show model scale increases of efficiency of about 1%.

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