flotherm 11 1 new functionality - 易富迪科技 · must be applied to the very early transient...

FloTHERM® New Functionality

Software Version fth11.1

December 2015

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FloTHERM New Functionality, fth11.1 1 December 2015

Detailed Change Description This document provides an overview of the changes available in FloTHERM fth11.1.

Platform Support

Ref. Title Description

1.1 Change in supported

Operating Systems

Windows 10 Professional and Enterprise Editions are now supported.

1.2 Final version that

supports 32-bit

Operating Systems

FloTHERM v11.1 is the final release that will support 32-bit operating

systems.

2 FloTHERM New Functionality, fth11.1 December 2015

Model Calibration with T3Ster Measurements


2.1 Model Calibration

dialog in Command

Center

A Detailed Model Calibration menu is available from the top level of

the Command Center window. Using this command will launch a

‘Detailed Model Calibration dialog’. Note: Access to this dialog

requires access to a ‘ftcalibrator’ license feature.



2.2 Import of T3Ster

measurement file

T3Ster Master v2.4 allows export of a .flocalibration file containing all

information required to perform a model calibration optimization run in

FloTHERM v11.1.

Before a .flocalibration file can be exported, a square root correction

must be applied to the very early transient data. See T3Ster Master

documentation for instructions. The portions of the Structure Function

associated with this correction are ignored during calibration.

The ‘Import T3Ster Measurement’ command allows import of this

.flocalibration file.



2.3 Display of

Measurement

settings

After import of the .flocalibration file, the experimental power

dissipation, duration, and ambient temperature are displayed in the

‘Calibration Setup Check’ section of the dialog in the T3Ster column.

2.4 Display of

measurement data

After import of the .flocalibration file, the T3Ster recorded Zth curve,

Integral Structure Function curve, and Differential Structure Function

curve are displayed in the chart section of the dialog.



2.5 Specify what

FloTHERM

temperature response

should be used for

comparison

Any Monitor Point or Volume Region in the FloTHERM base model

can be designated as the temperature response to be compared with the

T3Ster measurement. In the case of a Volume Region, the mean

temperature within the Volume Region is recorded.

2.6 Display any defined

design parameters

and range

Any Input Variables defined as Design Parameters in Command Center

will be used to calibrate the model. These parameters and their

associated ranges are displayed in the Design Limits section of the

dialog.

Note that any Linear Function type Input Variables are fully considered

in the optimization, but are not displayed here.



2.7 Compare

FloTHERM Baseline

values with model

setup

The Calibration Setup Check will display the power, duration, and

initial temperature for the base FloTHERM model to allow comparison

with the experimental values. A graphical warning will be displayed if

the values differ.

The power reported here is the sum of any ‘Total Power’ settings in the

FloTHERM model on Source Attributes, Thermal Attributes, or on a

Die SmartPart.

2.8 Adjust FloTHERM

model command

The ‘Adjust’ command is used to modify the FloTHERM model to

ensure the power, duration, and initial temperature match the imported

T3Ster measurement setting.

Checking the ‘Regenerate Time Patches’ option will cause the ‘Adjust’

command to remove the existing time grid and re-create the time grid

patches according to this set of rules: One Time Patch per decade.

Minimum of 10 time steps and with an increasing index of 1.5

Note: Using the ‘Adjust’ command will cause Command Center to

detect a change to the baseline model and flag this to the user with a

flashing warning button. The user should click the warning button to

update all scenarios.



2.9 Create Scenarios A set of Design of Experiments scenarios can be created from within

the Detailed Model Calibration dialog. Enter the desired number of

experiments and click ‘Design Experiments’.

This can be used to either create the initial set of scenarios, or to create

additional scenarios after a calibration run to improve response surface

accuracy.

2.10 Define Calibration

Extent

The Calibration Extent is used to control the range of Rth that will be

considered for calibration. If the imported .flocalibration file was

created from a T3Ster TDIM project then the value of Calibration

Extent will be set to Theta JC upon import. Otherwise, it is set to the

maximum value of Rth in the experimental data and the user should

modify this to reflect the boundary between package and environment.

The calibration extent is indicated on both the Zth and structure

function charts.

2.11 Define Optimization

Type

Command Center supports both Response Surface and Sequential

Optimization techniques and either can be utilized for the model

calibration. The recommended approach is ‘Response Surface’ and this

is the default.

2.12 Calibrate Command The Calibrate command will solve any unsolved scenarios and then

proceed with the optimization process. The Cost Function is formed

automatically and is the difference between the FloTHERM Integral

Structure Function and the Imported T3Ster Structure Function below

the Calibration Extent and excluding the square root correction zone.

If Response Surface Optimization is used, then the optimal scenario

found is solved to avoid presenting an interpolated result.



2.13 Display R2

value for

each scenario and

optimal

The correlation coefficient (R2) for each scenario and the optimum is

displayed in the scenario table. The optimal R2 is also used to calculate

the Calibration Accuracy value (Accuracy = 100*R2) shown in the

dialog when calibration completes.

R2 = 1

This is the ideal result. The model is fully calibrated and perfectly

describes the experimental data.

R2 > 0.9

A very good result. All major model parameters have been identified.

0.7 < R2 < 0.9

Most parameters have been captured, but likely missing at least one

minor parameter, or an identified parameter range should be adjusted.

0.5 < R2 < 0.7

Likely missing several important parameters, or a parameter range is

inappropriate.

R2 < 0.5

Chosen Design Parameters or ranges are not capable of describing the

experimental data well.

2.14 Display Zth curve for

any solved scenario

User can display the Zth curve for any solved scenario, including the

optimum.



2.15 Display Structure

Function curves for

any solved scenario,

including the optimal

User can display the Structure Function curves for any solved scenario,

including the optimum.

2.16 Calibrated Result

Display

When calibration completes, the Scenario drop down list will select the

optimal scenario in the list, and thus the optimal Zth and Structure

Function curves are shown in the charts.

The calibration Accuracy (100*R2) is displayed in the Calibration

section of the dialog.



In the Scenario Table tab, the best answer is labeled as ‘Calibration

Optimum’, with the optimal values of the design parameters displayed.

The user may save the optimal model to a separate FloTHERM model

by using the ‘Save As’ command for the scenario.

2.17 Hide/Reveal controls

for charts

Any curve can be hidden or revealed by clicking the associated legend

entry to the right of the charts.

2.18 Calibration

Application Example

A new application example is installed with FloTHERM v11.1 that

illustrates the calibration setup and typical results for an IGBT module.

It’s called ‘IGBT-Calibration’ and can be found in the Application

Examples list when using Project/New.

2.19 FloXML Example A spreadsheet that creates a FloXML model of the IGBT module which

is calibrated in the new Application Example is installed in

“\MentorMA\flosuite_v111\flotherm\examples\Demonstration

Models\Detailed Model Calibration”. It is called “IGBT-Creator.xlsm”



2.20 Response Surfaces When Response Surface Optimization is utilized for calibration,

response surfaces are made available for R2 and cost function. These

are accessible in the standard way via the “Chart\3D RSO Viewer” and

“Chart\2D RSO Viewer” commands.

An indication of the Response Surface accuracy is included in the title

bar of each chart. A large value displayed here for the cost function

chart suggests that additional scenarios need to be created and solved to

improve both response surface accuracy and calibration accuracy.

2.21 Calibration

Diagnostic

Information

If an environment variable called FLOCALIBRATION_DIAGS is

defined, then text files containing calibration information for each

scenario will be written into a c:\calibration folder. These files are:

• Cost Function calculation details for each scenario and the base

case

• T3Ster Master Structure Function data

• Rth lower limit for the square root correction. Portions of the

Structure Function smaller than this value are not considered

during calibration.



2.22 Chart Splitters The size of Zth and structure function charts within the dialog are

controlled with horizontal and vertical splitters. One can optionally

display only one of the charts by moving the vertical splitter bar to the

top or bottom of the dialog.


General


3.1 Copy cuboids into

Heat Pipe objects

Cuboids can be copied into Heat Pipe SmartParts to allow complex

heat pipe geometry to be created more easily.

3.2 Project name

displayed on

detached Drawing

Board.

The project name is now displayed on the title bar of a detached

Drawing Board window. This makes it easier to work on multiple

FloTHERM models at the same time.



3.3 64-bit FloEDA

Bridge

The FloEDA Bridge module will now run as a 64-bit application. This

allows more detailed PCB models to be imported or created and

transferred to FloTHERM.

3.4 Sanyo Denki Fan

library update

All fans provided in the Sanyo Denki fan library have been updated to

reflect the latest information from the vendor.

3.5 New IDEAS site The Help\Submit Enhancement Request command now leads to a re-

implemented IDEAS website.

3.6 DCIM Software

Development

Toolkit

Development tools and worked examples for server, rack, and room are

now installed to the examples folder to facilitate the incorporation of

FloXML and FloSCRIPT technology into Data Center Infrastructure

Management software tools.

The toolkit is provided in the examples\DCIM Development Toolkit

folder.

3.7 Any solver license

will unlock parallel

solver

Any available solver license will allow access to the parallel solver,

including a serial solver license.


Known Issues

• Interrupting and then continuing a Command Center scenario that is a transient simulation will cause

the temperature history for monitor points and volume regions to start recording temperatures at t=0.

This can be visualized by checking the ‘Solution Monitoring Tab’ in Command Center.

Workaround: If a transient scenario is interrupted, ensure that the scenario is re-initialized prior to

solving it again.

• ‘Save with No Results’ and ‘Pack with No Results’ will lose data associated with model calibration.

Model calibration relies on being able to extract temperature vs time data for any monitor point or

volume region. The ‘Save with No Results’ and ‘Pack with No Results’ do not store this information,

and all Command Center scenarios will need to be re-solved to reproduce the results. Workaround:

Ensure that all the results are saved by using only the ‘Save’, ‘Save As’ command, or the ‘Pack’

command when saving or archiving projects.

flotherm 11 1 new functionality - 易富迪科技 · must be applied to the very early transient...

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