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3DS.
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Structural-Electromagnetic Co-Design for Next Generation
Electronic Devices
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Co-Design with Dassault Systèmes and CST Solutions
Smartband
Structural and EM design in the3DExperience platform for integrated, multi-disciplinary
optimization
Flex Cables
Sequential Structural and EM solution with easy import and
export of results.
Smart Appliances
Tightly coupled Structural andEM analysis.
Co-Simulation framework
Sequential Design Integrated MultiphysicsConcurrent Design
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Application 1: Smart Band Design
Requirement 1: Develop a novel mechanical design that snap fits on the user’s wrist. Fits well but doesn’t cause discomfort
Requirement 2: Provides reliable Bluetooth connectivity at all times, on or off use.
Requirement 3: Meet all requirements for warranty and regulatory compliance
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From Concept to Prototype
Design concept Prototype based on slap-band
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Slap Band Mechanical Design: Simulating the Snap
Configuration 1: Pre-stressed
Configuration 2: Stress-free
Meet Warranty
Easy to wear
Fatigue
Slap Force
Design Requirements
Engineering Parameter
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Mechanical Design: Slap Forces and FatigueSpring SteelBand with Prestress
Rigid Cylinder
FE Model Set up
Slap Force
Desired Limit
Region most susceptible to fatigue failure
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Creating a Robust Mechanical Design
A Parametric Design of Experiments (DOE) provides design insight Allows for robust design under tighter constraints Helps tunes design for optimal mechanical performance
Run DOE on:Band thickness: Base ± 50%Band Prestress: Base ± 30%Curvature Depth: Base ± 25%
B
B
A
A
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Mechanical Design: Comfort and Fit on Wrist
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Application 1: Smart Band Design
Requirement 1: Develop a novel mechanical design that snap fits on the user’s wrist. Fits well but doesn’t cause discomfort
Requirement 2: Provides reliable Bluetooth connectivity at all times, on or off use.
Requirement 3: Meet requirements for warranty and regulatory compliance
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Impact of Bluetooth transmitter on human body
Human Interaction
1g Averaged SAR at 2.45 GHzBluetooth Module on Smart-Band
Class 22.5 mWRange ~10 m
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Impact of human body on wireless connectivity range
Human Interaction
Installed on wristStandalone
Reference (100%) Installed Range (51%)
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Bluetooth Design
Bluetooth band 2.4 to 2.4835 GHz
Reflection Coefficient (dB)
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Far-Field Radiation Pattern
Bluetooth DesignPolar plot x-y plane
Polar plot y-z plane3D
Pattern
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Flat vs. curved Smart-Band
Installed Performance
Antenna response affected by metal band
Reflection Coefficient (dB)
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Impact on maximum range
Wireless Connectivity
Bluetooth module Installed on flat Smart-Band Installed on curved Smart-Band
100% Range 60% Range 56% Range
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Holes added to smart-band design to improve RF performance (?)
Wireless Connectivity
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Exhibit 1: Smart Band Design
Requirement 1: Develop a novel mechanical design that snap fits on the user’s wrist. Fits well but doesn’t cause discomfort
Requirement 2: Provides reliable Bluetooth connectivity at all times, on or off use.
Requirement 3: Meet requirements for warranty and regulatory compliance
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Conflicting Design Requirements pose a challenge
More Holes Improve Antenna Performance Holes Degrade Fatigue Life
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Structural Design EM DesignCo-Design
Multi-Disciplinary Optimization
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Co-Design Results Analytics
A
BA
B
Fatigue Life Bluetooth Performance
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Addressing Key RequirementsCo-Design
Structural Electromagnetic
User Experience
Connectivity Reliability
Regulatory Compliance
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Co-Design with Dassault Systèmes and CST Solutions
Smartband
Structural and EM design in the3DExperience platform for integrated, multi-disciplinary
Optimization
Flex Cables
Sequential Structural and EM solution with easy import and export of results.
Collaboration on 3DExperience platform
Smart Appliances
Tightly coupled Structural andEM analysis.
Co-Simulation framework
Sequential Design Integrated MultiphysicsConcurrent Design
23
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Sequential Coupling – Flex Cable Capture the effects of mechanical deformation on electromagnetic aspects
of the deviceSimplified geometric deformation may not be sufficientStudy signal integrity and radiated emission of the bent flex cable
Ability to sequentially couple structural and electromagnetic solvers. Ability to entertain different meshing requirements from electromagnetic and
structural solvers. Analyze the reliability and fatigue due to repeating bending.
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Abaqus – CST Sequential CouplingRadiated emissionsSignal Integrity
Deformed geometry importAbaqus CST
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.: 3D
S_Do
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2015
Co-Design with Dassault Systèmes and CST Solutions
Smartband
Structural and EM design in the3DExperience platform for integrated, multi-disciplinary
Optimization
Flex Cables
Sequential Structural and EM solution with easy import and
export of results.
Smart Appliances
Tightly coupled Structural andEM analysis.
Co-Simulation framework
Sequential Design Integrated MultiphysicsConcurrent Design
26
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COM
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Co-Simulation – Induction Heating Fully coupled electromagnetic-thermal-structural problem. Wide range of temperatures from room temperature to 1000°C. Temperature dependent material properties
Many material properties vary with temperature by up to a factor of 5.Magnetic materials turn non-magnetic at Curie temperature.Phase transformation of material leads to hardening
Account for very small skin depth which varies with temperature
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Abaqus – CST Co-Simulation
CSE employs physics based conservative mapping. Automatically maps field variables between dissimilar meshes.
CST AbaqusAbaqus
CSE
Joule Heat
Lorentz Force
Temperature
Displacement
Heat Flux
Force
Temperature
Displacement
TemperatureCurrent Density
Evolution ofTemperature
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