Applied Mechanics and Materials Vols. 789-790

Abstract: The proposed systematic approach for modeling and analyzing mechanical assemblies that require remote handling is based on developing assembly models found in the literature but considering the specific characteristics of the machines that require remote handling. Five assembly models to represent mechanical assemblies are identified and discussed. An important contribution is the definition and modeling of four sequential stages (locate, guide, fit and lock) for the assembly and disassembly of components by means of remote handling. The proposed approach provides a baseline to understand the process of assembly and disassembly by means of remote handling and it can be used to develop innovative assembly features compatible with remote handling.

Abstract: Embedded systems demand to take high performance while executing on batteries. In such environment, the systems must be optimized with available technique to reduce energy consumption while not sacrificing performance. Especially, in mobile devices, power consumption is an important design constraint. Switching activity accounts for over 90% of total power consumption in a digital circuit. In this paper, we describe an approach to design instruction format for low power instruction fetch. The proposed method reduces switching activity of the instruction fetch logic by using a heuristic that minimizes switching between adjacent instructions. To do this, the proposed approach encodes opcodes so that frequently executed instruction pairs have smaller bit changes.

Abstract: This work proposes a technique for optimizing data placement of application-wide reused data so that it resides in scratchpad memory of processing elements in multiprocessor system on chips. The proposed technique identifies data elements with fine granularity that can profitably be placed in the scratchpad memories to maximize performance and energy gains. We present a heuristic approach that efficiently exploits the scratchpad memories using memory access footprint. Our experimental results indicate that our approach is able to reduce energy consumption by 30% over cache based memory subsystems.

Abstract: Dielectric elastomer (DE) is gaining importance for potential strategic and commercial application as actuators. This paper reports the experimental investigation on different mechanical phenomena at large deformation of a commercially available acrylic dielectric elastomer material, VHB 4910 (3M) which is widely used for dielectric elastomer actuator (DEA) research. Attempts are made for accurate and precise experimental determination of nonlinear stress-strain, strain rate dependent hysteresis behaviour and cyclic softening of this material. It is observed that with the increase in strain rate maximum stress at a particular strain increases whereas hysteresis loss decreases. In the cyclic loading case after a particular number of cycles almost the hysteresis loss and maximum stress becomes constant. These experimental results are likely to be interesting for the designers for proper designing and characterization of the actuators fabricated with this material.

Abstract: Considered the theoretical foundation of fractional order, the fractional mathematical model of the Buck-Boost converter in continuous conduction mode operation is built and analyzed in theory. Based on the improved Oustaloup fractional calculus for filter algorithm, the simulation model is framed by using the Matlab/Simulink software. And the simulation results are compared with that of integer order. It proves the correctness of the fractional order mathematical model and the theoretical analysis.

Abstract: This paper analyzes the differences between electric learner-driven vehicle and fuel cars in the process of turning, and establish a multiple parameter control model from the fuzzy control method, to determine driving resistance changes, and using PWM regulating motor armature voltage to control the rotate speed’s change, at the same time, we use the measured speed as feedback signal to regulate the armature voltage again. Realize the electric motor speed steady in the process of turning, make the electric learner-driven vehicle have the similar driving feeling with the fuel learner-driven vehicle.

Abstract: Innovative algorithms and software evaluating the three-dimension topography in laser micro-machining are developed in this paper. First according to the features of the three-dimension surface consisted of micro peaks and pits, Gaussian curve parameters are presented and used to form a evaluation system with 22 parameters for three-dimension topography. Based on this, to completely and precisely evaluate the three-dimension topography,an assessment module for power spectral density is designed and implemented. Through integrating this module with the 22 parameters, a complete and precise evaluation system is built, which can evaluate the performance not only in vertical direction but also in horizontal is obtained. In software, through using MATLAB/GUI latest interface to implement integration, the following functions are implemented: surface three-dimension topography rebuilding, signal noise reducing, assessment data extracting, roughness calculating, and two-dimensional frequency domain analyzing. Furthermore, with this software, through comparing the parameters and spectrum, it is easy to determine the frequency affecting the roughness,thus providing some clues on how to further reduce the surface roughness. Test results show that this software system can provide more accurate assessment for the surfac three-dimension topography, and can be used to ultra-precision machining surface assessment.

Abstract: Due to the rise of biological and MEMS technology in recent years, some micro flow system components have been paid attentions to developed by many investigators. The importance of micro-pumps manufactured is higher than the other part of micro flow system since it is the power source of the entire micro-flow system and responsible for driving working fluid in the microfluidic system. In actual operation, the instability and bad dynamic characteristics of the micro-pump will cause larger fluid flow mobility error, such as transport behavior and response procedures failure, etc., and even damage the microfluidic system. Therefore, to investigate the stability and dynamic characteristics of a micro pump is necessary. The miniature piezoelectric film micro-pump, made by Microjet Technology Co., Ltd., is employed to study in this work. The computer graphics software SolidWorks is used to build the model of the micro pump. Then, The Finite element analysis (FEA), ANSYS Workbench, is also employed to analyze the dynamic characteristics of this micro pump.

Abstract: Electro-hydraulic actuators are widely used in motion control application. Position control using hydraulic systems is widely applied in several engineering fields. However, their design is not a simple task since it is necessary to observe their behavior according to control theory.This paper represents an implementation of motion control of electro-hydraulic actuator by using PID controller. The objective of this study was to obtain Physical model of an electro-hydraulic actuator using system identification technique by estimating model using AMESim and provide the electro-hydraulic system which depends the hydraulic actuators to meet the motion control system demands.The physical model of electro-hydraulic actuator is established; it was modeled and simulated by using advanced performance modeling and simulation environment AMESim. It is shown that using AMESim to model and simulate performance more directly and veritably, and can complete the design task accurately and quickly.

Abstract: This paper presents an effective rule-based method for extracting and recognizing the machining features from 3D solid model. The machining feature is automatically recognized while considering the relationship between machining feature and machining process. This proposed method is capable of recognizing not only prismatic machining features but also multi-axis machining features from many kinds of complex design features in both protrusion and depression. It also succeeds in recognizing various types of interaction in a uniform way. The capability of the proposed method is demonstrated in one specific case study.