scholarly journals Design of Multilayer Dielectric Cover to Enhance Gain and Efficiency of Slot Arrays

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Giorgio Montisci ◽  
Zusheng Jin ◽  
Mingchao Li ◽  
Hu Yang ◽  
Giovanni Andrea Casula ◽  
...  
Keyword(s):  
Free Space ◽  
Production Cost ◽  
Synthesis Method ◽  
Design Procedure ◽  
Optimal Choice ◽  
Slot Arrays ◽  
Consequent Reduction ◽  
Effective Design ◽  
Array Gain ◽  
Multilayer Dielectric

An effective design procedure, based on the Elliot synthesis method, is proposed to investigate the properties of waveguide slot arrays with multilayer dielectric cover. Then, the features of the designed arrays are analyzed by means of a FEM commercial software, namely, Ansys HFSS 13. We show how a proper choice of the dielectric cover configuration allows increasing the array gain and aperture efficiency, while taking advantage of the properties of the radome structure, in terms of insulation, protection, and pressurization of the radiating waveguides. Therefore, a significant outcome of the optimal choice of the multilayer dielectric cover is the reduction of the number of slots with respect to an array radiating into free space with the same gain and efficiency, with a consequent reduction of the production cost.

scholarly journals Design of Shaped Beam Planar Arrays of Waveguide Longitudinal Slots

2013 ◽  
Vol 2013 ◽  
pp. 1-12 ◽  
Author(s):  
Giovanni Andrea Casula ◽  
Giuseppe Mazzarella ◽  
Giorgio Montisci
Keyword(s):  
Design Procedure ◽  
Pencil Beam ◽  
Shaped Beam ◽  
Planar Arrays ◽  
Slot Arrays ◽  
Synthesis Procedure ◽  
Set Up ◽  
Aperture Distribution ◽  
Longitudinal Slot ◽  
Effective Design

The Elliott’s procedure for the design of a pencil beam waveguide longitudinal slot array has been generalized to encompass the design of shaped beam planar slot arrays. An extended set of design equations, taking into account in an operative way the feeding part of the array, has been devised. From this set of equations, a general and effective design procedure has been set up, shedding light on the constraints posed by a complex aperture distribution. The results of the proposed synthesis procedure have been validated through comparison with a commercial FEM software.

An effective design procedure for A-Sandwich radome

2010 ◽  
Author(s):  
Kyung-Won Lee ◽  
Yeong-Chul Chung ◽  
Ic-Pyo Hong ◽  
Jong-Gwan Yook
Keyword(s):  
Design Procedure ◽  
Effective Design

Are Circular Shaped Masks Adequate in Adaptive Mask Overlay Topology Synthesis Method?

2010 ◽  
Vol 133 (1) ◽  
Author(s):  
Anupam Saxena
Keyword(s):  
Resource Constraints ◽  
Synthesis Method ◽  
Design Procedure ◽  
Topology Design ◽  
Two Dimensional ◽  
Closed Curves ◽  
Compliance Minimization ◽  
Topological Features ◽  
Mean Compliance ◽  
Material Layout

Previous versions of the material mask overlay strategy (MMOS) for topology synthesis primarily employ circular masks to simulate voids within the design region. MMOS operates on the photolithographic principle by appropriately positioning and sizing a group of negative masks and thus iteratively improves the material layout to meet the desired objective. The fundamental notion is that a group of circular masks can represent a local void of any shape. The question whether masks of more general shapes (e.g., any two-dimensional closed, nonself intersecting polygon) would offer significant enhancements in efficiently attaining the appropriate topological features in a continuum remains. This paper investigates the performance of two other mask types; elliptical and rectangular masks are compared with that of the circular ones. These are the respective modest representatives of closed curves and their polygonal approximations. First, two mean compliance minimization examples under resource constraints are solved. Thereafter, compliant pliers are synthesized using the three mask types. It is observed that the use of elliptical or rectangular masks do not offer significant advantages over the use of circular ones. On the contrary, the examples suggest that less number of circular masks are adequate to model the topology design procedure more efficiently. Thus, it is postulated that using generic simple closed curves or polygonal masks will not introduce significant benefits over circular ones in the MMOS based topology design algorithms.

Dynamic System Synthesis With a Bond Graph Approach: Part II—Conceptual Design of an Inertial Velocity Indicator

1993 ◽  
Vol 115 (3) ◽  
pp. 364-369 ◽  
Author(s):  
R. C. Redfield
Keyword(s):  
Conceptual Design ◽  
Vibration Isolation ◽  
Synthesis Method ◽  
Design Procedure ◽  
Systems Design ◽  
Design Problems ◽  
Performance Requirements ◽  
Output Performance ◽  
Response Performance ◽  
Dissipation Elements

This work develops the conceptual design of an inertial velocity sensor drawing upon the impedance synthesis method in Part I of this paper. Specifications are frequency based impedances and resulting designs are configurations of dynamic energy storing and dissipation elements. The design procedure can be extended to a class of systems design problems where frequency response performance is of primary importance. A key to this work is that the method designs systems from scratch; initial configurations are unknown. As a theme example to demonstrate the utility of the method for conceptual design, constrained and unconstrained inertial velocity sensors are configured based on input-output performance requirements. Such sensors find application in many motion control problems including mechanism and manipulator control, and vibration isolation control. The design methodology generates a number of different sensors that can measure absolute velocity for some or all ranges of frequency.

scholarly journals 3D Heat transfer Simulation of an injection mold: comparison between ANSYS Workbench and ANSYS Mechanical APDL

2021 ◽  
Author(s):  
Hugo Miguel Silva ◽  
Leandro Fernandes ◽  
Hugo Luís Rodrigues ◽  
João Tiago Noversa ◽  
António José Pontes
Keyword(s):  
Design Procedure ◽  
Cost Effective ◽  
Injection Molding Process ◽  
Machining Processes ◽  
Molding Process ◽  
Cooling Channels ◽  
Fine Mesh ◽  
Conformal Cooling Channels ◽  
Heat Transfer Simulation ◽  
Effective Design

Abstract Because of recent advancements in additive manufacturing, fabricating conformal cooling channels (CCCs) has become easier and more economical. In the injection molding process, CCCs provide higher cooling performance than standard (straight drilled) channels. The major reason for this is that CCCs may follow the courses of the molded geometry, whereas typical channels created using traditional machining processes cannot. Using CCCs can reduce thermal strains and warpage while also improving cycle time and achieving a more uniform temperature distribution. CCC, on the other hand, has a more complicated design procedure than traditional channels. Simulations using computer-aided engineering (CAE) are critical for achieving an effective and cost-effective design. This article compares two ANSYS modules for the purpose of validating results. It can be inferred that the two modules produce similar results for models with fine mesh. As a result, the ANSYS module to work on should be chosen depending on the job's goal as well as the CAD geometry's complexity.

Optimal Synthesis of Compliant Mechanisms to Satisfy Kinematic and Structural Requirements: Preliminary Results

1996 ◽  
Author(s):  
Mary I. Frecker ◽  
Noboru Kikuchi ◽  
Sridhar Kota
Keyword(s):  
Compliant Mechanisms ◽  
Compliant Mechanism ◽  
Synthesis Method ◽  
Design Procedure ◽  
Problem Formulation ◽  
Mechanism Synthesis ◽  
Ground Structure ◽  
Design Problems ◽  
Structural Requirements ◽  
External Loads

Abstract Compliant mechanism synthesis is an automated design procedure which allows the designer to systematically generate the optimal structural form for a particular set of loading and motion requirements. The synthesis method presented here solves a particular class of design problems, where the compliant mechanism is required to be both flexible to meet motion requirements, and stiff to withstand external loads. A two-part problem formulation is proposed using mutual and strain energies, whereby the conflicting design objectives of required flexibility and stiffness are handled via multi-criteria optimization. The resulting compliant mechanism topologies satisfy both kinematic and structural requirements. The problem formulation is implemented using a truss ground structure and SLP algorithm. Several design examples are presented to illustrate this method.

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