scholarly journals Car Soundproof Improvement through an SMA Adaptive System

Actuators ◽  
2018 ◽  
Vol 7 (4) ◽  
pp. 88 ◽  
Author(s):  
Salvatore Ameduri ◽  
Angela Brindisi ◽  
Monica Ciminello ◽  
Antonio Concilio ◽  
Vincenzo Quaranta ◽  
...  
Keyword(s):  
Computer Aided Design ◽  
Adaptive System ◽  
System Development ◽  
Numerical Models ◽  
Modular System ◽  
Design Parameters ◽  
Joule Effect ◽  
Acoustic Insulation ◽  
Opening And Closing ◽  
Aided Design

The work at hand focuses on an adaptive system aimed at improving the soundproof performance of car door seals at specific regimes (cruise), without interfering with the conventional opening and closing operations. The idea addresses the necessity of increasing seal effectiveness, jeopardized by aerodynamic actions that strengthen as the speed increases, generating a growing pressure difference between the internal and the external field in the direction of opening the door, and then deteriorating the acoustic insulation. An original expansion mechanism driven by a shape memory alloy (SMA) wire was integrated within the seal cavity to reduce that effect. The smart material was activated (heated) by using the Joule effect; its compactness contributed to the realization of a highly-integrable and modular system (expanding cells). In this paper, the system development process is described together with the verification and validation activity, aimed at proving the functionality of the realized device. Starting from industrial requirements, a suitable solution was identified by considering the basic phenomenon principle and the allowable design parameters. The envisaged system was designed and its executive digital mock-up (CAD, computer-aided design) was released. Prototyping and laboratory tests showed the reliability of the developed numerical models and validated the associated predictions. Finally, the system was integrated within the reference car. To demonstrate the insulation effect, the experimental campaign was carried out in an anechoic room, achieving significant results on the concept value.

scholarly journals Car Soundproof Improvement Through an SMA Adaptive System

2018 ◽  
Author(s):  
Salvatore Ameduri ◽  
Angela Brindisi ◽  
Monica Ciminello ◽  
Antonio Concilio ◽  
Vincenzo Quaranta ◽  
...  
Keyword(s):  
Smart Materials ◽  
Adaptive System ◽  
Numerical Models ◽  
Design Parameters ◽  
Joule Effect ◽  
Speed Increase ◽  
Closure Operations ◽  
Working Principle ◽  
High Level ◽  
Final System

The work at hand focuses on an adaptive system aimed at improving the soundproof performance of car door seals at specific working regimes (cruise), without interfering with the conventional open-closure operations. The idea addresses the necessity of increasing the seal effectiveness, jeopardized by aerodynamic actions more and more important as the speed increase, generating a pressure difference between the internal and the external filed, in the direction of opening the door. To recover this effect, an expanding mechanism was integrated within the seal cavity, driven by an SMA actuator. The material was activated (heated) by Joule effect; its compactness, intrinsic of smart materials, contributed to arrive to a final system characterized by a high level of integrability (expanding cells). In this paper, the development process is described together with the verification activity, aimed at proving the functionality of the realized device. Starting from the industrial requirements, the most appropriate solution was identified highlighting the working principle and the main design parameters involved. Then, the envisaged system was designed and its executive digital mock up (CAD) was released. Prototyping and laboratory validation showed the reliability of the numerical models and the associated predictions. On this basis, the integration task within the actual reference car was faced. To demonstrate the isolation effect of the proposed system, an experimental campaign was finally organized in an anechoic room, achieving significant results on the concept value.

scholarly journals Design and Optimization of Germanium-Based Gate-Metal-Core Vertical Nanowire Tunnel FET

Micromachines ◽  
2019 ◽  
Vol 10 (11) ◽  
pp. 749 ◽  
Author(s):  
Jang ◽  
Yoon ◽  
Cho ◽  
Jung ◽  
Lee ◽  
...  
Keyword(s):  
Computer Aided Design ◽  
Design Parameters ◽  
Channel Height ◽  
Logic Device ◽  
Metal Core ◽  
Design And Optimization ◽  
Channel Thickness ◽  
Effect Transistor ◽  
Tunnel Field Effect Transistor ◽  
Aided Design

In this paper, a germanium-based gate-metal-core vertical nanowire tunnel field effect transistor (VNWTFET) has been designed and optimized using the technology computer-aided design (TCAD) simulation. In the proposed structure, by locating the gate-metal as a core of the nanowire, a more extensive band-to-band tunneling (BTBT) area can be achieved compared with the conventional core–shell VNWTFETs. The channel thickness (Tch), the gate-metal height (Hg), and the channel height (Hch) were considered as the design parameters for the optimization of device performances. The designed gate-metal-core VNWTFET exhibits outstanding performance, with an on-state current (Ion) of 80.9 μA/μm, off-state current (Ioff) of 1.09 × 10−12 A/μm, threshold voltage (Vt) of 0.21 V, and subthreshold swing (SS) of 42.8 mV/dec. Therefore, the proposed device was demonstrated to be a promising logic device for low-power applications.

Geometric Measurement of Wear in Tibial Inserts Through an Autonomous Reconstruction of the Original Surface

2011 ◽  
Author(s):  
Christopher B. Knowlton ◽  
George Hanson ◽  
Diego Orozco ◽  
Michel P. Laurent ◽  
Markus A. Wimmer
Keyword(s):  
Computer Aided Design ◽  
Design Parameters ◽  
Limiting Factor ◽  
Total Knee Replacements ◽  
Knee Replacements ◽  
Cad Models ◽  
Total Knee ◽  
Aided Design ◽  
Geometric Measurement ◽  
Worn Surfaces

Wear of the polyethylene tibial components in total knee replacements remains a limiting factor of implant life. Studies have used coordinate measuring machines (CMM) to estimate volumetric wear in retrieved components. This technique requires knowledge of the original pre-worn surfaces. Pre-worn surfaces have been successfully approximated in literature by nominal computer-aided design (CAD) models or, more commonly, size-matched unused inserts [1,2]. However, models and drawings of implants are proprietary, and many design parameters can have large tolerances. Unworn components are costly, often unattainable for obsolete implants and subject to deviation between batches.

Computer Aided Automotive Interior Design for Kansei Engineering

2011 ◽  
Vol 130-134 ◽  
pp. 504-507 ◽  
Author(s):  
Li Hong Zhu ◽  
Han Zhao ◽  
Xiao Chen Yin ◽  
Li Jun Zhu ◽  
Liang Zhang
Keyword(s):  
Interior Design ◽  
Automotive Industry ◽  
Computer Aided Design ◽  
Design Parameters ◽  
Kansei Engineering ◽  
Computer Aided ◽  
Quantitative Analysis Method ◽  
Aided Design ◽  
Industry Trends ◽  
Automotive Interior

Nowadays, the development of automotive industry trends more personalized and profuse product alternatives. Kansei Engineering has been applied to interior design for customer satisfaction based on ergonomic technology in the paper. The computer aided design automotive interior system includes two subsystems: one is Computer-aided Sensation Survey Subsystem and the other is Computer-aided Automobile Interior Design Subsystem. Mathematical statistics and quantitative analysis method are adopted to establish quantified relationship between product perceptual image and design parameters.

Une génération interactive des données pour appliquer la méthode des éléments finis

1984 ◽  
Vol 11 (2) ◽  
pp. 335-345
Author(s):  
M. Sylvain Charron ◽  
M. Claude Marche
Keyword(s):  
Finite Element ◽  
Computer Aided Design ◽  
Numerical Models ◽  
Complex Data ◽  
Efficient Manner ◽  
Widespread Application ◽  
Finite Element Grid ◽  
Interactive Computation ◽  
Éléments Finis ◽  
Aided Design

The advent of new and powerful computers, during the last few years, has resulted in a widespread application of numerical models to solve engineering problems. At the present time, one of the popular numerical techniques utilised by engineers is the finite element method.In order to generate and organize in an efficient manner the complex data structure resulting from its application a new modular approach has been developed. This approach is particularly suited to the treatment of heterogeneous domains often encountered in engineering practice.A modified version of the "Multigrid" technique is used to solve the Thompson elliptic equations in order to generate a 2-D finite element grid. A graphical interactive computation system is used and we can consider implementing the programs in a micro- or mini-computer. Key words: computer-aided design, finite element grid generator.

An Analysis of Drill Geometry for Optimum Drill Design by Computer. Part II—Computer-Aided Design

1970 ◽  
Vol 92 (3) ◽  
pp. 657-666 ◽  
Author(s):  
S. Fujii ◽  
M. F. DeVries ◽  
S. M. Wu
Keyword(s):  
Computer Program ◽  
Computer Aided Design ◽  
Cutting Planes ◽  
Orthogonal Cutting ◽  
Design Parameters ◽  
Twist Drill ◽  
Grinding Parameters ◽  
Computer Aided ◽  
Aided Design ◽  
Drill Design

In Part II, a computer program that aids in the design of a twist drill is described, based on the analysis presented in Part I. A true drill and a “computer-designed” drill having identical design and grinding parameters are compared in orthogonal cutting planes. The effects of the design parameters on drill geometry are investigated utilizing the computer program.

Computer-Aided Design of X-Ray Microtomographic Scanners

2014 ◽  
Vol 1033-1034 ◽  
pp. 1327-1330 ◽  
Author(s):  
V.I. Syryamkin ◽  
E.N. Bogomolov ◽  
M.S. Kutsov
Keyword(s):  
Computer Aided Design ◽  
Three Dimensional ◽  
Design Parameters ◽  
Optical Elements ◽  
X Ray ◽  
X Ray Imaging ◽  
Functional Scheme ◽  
Computer Aided ◽  
Neural Network System ◽  
Aided Design

The article is to study the development of computer-aided design of X-ray microtomography - the device for investigating the structure and construction three-dimensional images of organic and inorganic objects on the basis of shadow projections. This article provides basic information regarding CAD of X-ray microtomography and a scheme consisting of three levels. The article also shows basic relations of X-ray computed tomography, the generalized scheme of a X-ray microtomographic scanner. The methods of X-ray imaging of the spatial microstructure and morphometry of materials are described. The main characteristics of an X-ray microtomographic scanner, the X-ray source, X-ray optical elements and mechanical components of the positioning system are shown. The block scheme and software functional scheme for intelligent neural network system of analysis of the internal microstructure of objects are presented. The method of choice of design parameters of CADof X-raymicrotomography is aimed at improving the quality of design and reduce of costs of it. It is supposed to reduce the design time and eliminate the growing number of engineers involved in development and construction of X-ray microtomographic scanners.

Computer-Aided Design of Compact Helical Gear Sets

1989 ◽  
Vol 111 (2) ◽  
pp. 285-289 ◽  
Author(s):  
C. S. Jog ◽  
S. S. Pande
Keyword(s):  
Computer Aided Design ◽  
Design Strategy ◽  
Helix Angle ◽  
Helical Gear ◽  
Optimization Techniques ◽  
Design Parameters ◽  
Gear Design ◽  
Computer Aided ◽  
Bending Stresses ◽  
Aided Design

This paper presents the design strategy for the Computer-Aided Design (CAD) of compact helical gear sets. Using optimization techniques, fundamental gear design parameters such as the number of teeth on the pinion, helix angle, and diametral pitch (or module) are selected subject to constraints on bending stresses, contact stresses, and involute interference limits for both standard and nonstandard gearing. The CAD procedure is illustrated with the help of a design example.

SIMULATION OF THE FIGHTING IN THE DOMESTIC CAD SOFTWARE RADAR FULL END-TO-END CYCLE

2018 ◽  
pp. 30-34
Author(s):  
A. P. Konovalchik ◽  
O. A. Plaksenko ◽  
A. O. Schiriy
Keyword(s):  
Computer Aided Design ◽  
Import Substitution ◽  
Integrated Design ◽  
Design Parameters ◽  
Design System ◽  
Loop Design ◽  
Radar Systems ◽  
Computer Aided ◽  
End To End ◽  
Aided Design

JSC Almaz-Antey in the implementation of the integrated design of complex electronic systems, particularly radar systems, it is required to solve the problem of choosing and optimizing the design parameters of radar devices, including antenna systems, transmitter-receiver paths of radar systems (radar), algorithms and devices for digital generation and processing of radar signals, and radar systems in General. Currently there is no domestic computer-aided design systems that solve these tasks in the complex. Therefore, to solve such problems, the Concern’s enterprises are used by a number of disparate software solutions with their own development and their foreign counterparts. Due to the restrictions caused by the sanctions, the closed scope of the work, as well as in import substitution, highly relevant is the creation of CAD radar, allowing to solve the above problems in a continuous end-to-end loop design. The development of CAD radar conducted by the JSC Almaz-Antey, its subsidiaries and companies with expertise in the design of the radar, using their existing backlog. The paper shows the General architecture of a domestic computer aided design in full cycle end-to-end radar systems (facilities, stations); the concept of five levels of design in the system being developed and the basic requirements for the implementation of this concept. The specificity of the developed computer-aided design system is most pronounced in activity-based scenarios for the use of the designed product in terms of specific air and space attack and defense, and is implemented in the form of functional simulation of the fighting.

Internal Combustion Engines: A Computerized Design Approach

2007 ◽  
Vol 18-19 ◽  
pp. 423-433
Author(s):  
John A. Akpobi ◽  
P. Oboh
Keyword(s):  
Computer Aided Design ◽  
Internal Combustion Engines ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Object Oriented Programming ◽  
Design Parameters ◽  
Combustion Engines ◽  
Design Software ◽  
Aided Design ◽  
Oriented Programming Language

This paper describes computer-aided-design software which accurately and efficiently designs internal combustion engine (I.C.) parts with the aid of Microsoft Visual Basic Object - oriented programming language. In addition to numerically outputting solutions (design parameters), the software also provides graphical solutions which facilitates easy visualization of trends in the variation of the solutions with important parameters. We then illustrate its accuracy and efficiency with some benchmark examples.

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