Modal practical - Revision history

Lmagimel at 09:16, 26 November 2024

2024-11-26T09:16:20Z

← Older revision		Revision as of 11:16, 26 November 2024
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	[[category:Modal]]		[[category:Modal]]
			[[category:WikiOros]]
	==Download==		==Download==
	Download the data of the project [https://orossas.sharepoint.com/:u:/g/support/ER5_KKas6Y9Fm2neEIlNXt4BR5N3qnpI_3kIWyGylOCrXA?e=HeBoff here].		Download the data of the project [https://orossas.sharepoint.com/:u:/g/support/ER5_KKas6Y9Fm2neEIlNXt4BR5N3qnpI_3kIWyGylOCrXA?e=HeBoff here].

Admin at 08:54, 10 September 2020

2020-09-10T08:54:57Z

← Older revision		Revision as of 10:54, 10 September 2020
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			[[category:Modal]]

	==Download==		==Download==
	Download the data of the project [https://orossas.sharepoint.com/:u:/g/support/ER5_KKas6Y9Fm2neEIlNXt4BR5N3qnpI_3kIWyGylOCrXA?e=HeBoff here].		Download the data of the project [https://orossas.sharepoint.com/:u:/g/support/ER5_KKas6Y9Fm2neEIlNXt4BR5N3qnpI_3kIWyGylOCrXA?e=HeBoff here].

Lmagimel: /* SAVE/EXPORT */

2020-07-17T07:30:28Z

SAVE/EXPORT

← Older revision		Revision as of 09:30, 17 July 2020
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	** Create a file uff 15 containing the geometry by clicking on File/export/geometry,		** Create a file uff 15 containing the geometry by clicking on File/export/geometry,
	** Export the modal results by right clicking on the modes list and select `Export Modes…<nowiki>’</nowiki>		** Export the modal results by right clicking on the modes list and select `Export Modes…<nowiki>’</nowiki>
	** Create a file .avi with a mose shape by displaying a mode shape and click on		** Create a file .avi with a mose shape by displaying a mode shape and click on [[Image:Modal_practical_30.png]]in the control panel.
	[[Image:Modal_practical_30.png~~\|framed\|none~~]]
	in the control panel.

Lmagimel: /* MODAL VALIDATION */

2020-07-17T07:30:13Z

MODAL VALIDATION

← Older revision		Revision as of 09:30, 17 July 2020
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	== MODAL VALIDATION ==		== MODAL VALIDATION ==


	The first way to check the results is to look at the coherence between the experimental FRFs and the synthesized ones in the selected frequency band.		The first way to check the results is to look at the coherence between the experimental FRFs and the synthesized ones in the selected frequency band.

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	Here, we have results from Broadband method. The repertory `Cantilever modal demo<nowiki>’</nowiki> contains a file `MIMO1 results<nowiki>’</nowiki> with the modal parameters obtained from MIMO1 method.		Here, we have results from Broadband method. The repertory `Cantilever modal demo<nowiki>’</nowiki> contains a file `MIMO1 results<nowiki>’</nowiki> with the modal parameters obtained from MIMO1 method.

	~~{\|border="0" cellspacing="2" width="100%"~~		In the operation tree, double click on MAC: [[Image:Modal_practical_28.png]]
	\|In the operation tree, double click on MAC
	\|
	[[Image:Modal_practical_28.png~~\|framed\|none~~]]
	The following window is displayed		The following window is displayed

	\|}

	~~----~~

	[[Image:Modal_practical_29.jpg\|framed\|none]]		[[Image:Modal_practical_29.jpg\|framed\|none]]
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	[[File:Mac.png\|framed\|none]]		[[File:Mac.png\|framed\|none]]


	~~----~~



	== SAVE/EXPORT==		== SAVE/EXPORT==

Lmagimel: /* MODAL ANALYSIS USING EMA BROBAND */

2020-07-17T07:29:26Z

MODAL ANALYSIS USING EMA BROBAND

← Older revision		Revision as of 09:29, 17 July 2020
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	* Auto selection of structural modes		* Auto selection of structural modes
	Press the button of "Auto Selection" or [[Image:Modal_practical_26.png]], the OM2 selects the physical/structural modes automatically. While move the mouse cursor on a pole, the modal frequency and damping ratio corresponding to this pole will be shown. You can move the mouse on different poles to check the stability via small change of the modal frequency and/or damping ratio.		Press the button of "Auto Selection" or [[Image:Modal_practical_26.png]], the OM2 selects the physical/structural modes automatically. While move the mouse cursor on a pole, the modal frequency and damping ratio corresponding to this pole will be shown. You can move the mouse on different poles to check the stability via small change of the modal frequency and/or damping ratio.



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	~~[[Image:Modal_practical_11.png\|framed\|none]]~~		Note: Manual selection of structural modes: a pole can also be manually selected by clicking it or deselected it by same operation. A selected pole will be marked with a shape symbol [[Image:Modal_practical_11.png]].

	Note: Manual selection of structural modes: a pole can also be manually selected by clicking it or deselected it by same operation. A selected pole will be marked with a shape symbol

	* Mode shapes calculation		* Mode shapes calculation
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	----		----

	# Results visualization		* Results visualization

	[[Image:Modal_practical_10.jpg\|framed\|none]]		[[Image:Modal_practical_10.jpg\|framed\|none]]

Lmagimel: /* MODAL ANALYSIS USING EMA BROBAND */

2020-07-17T07:28:26Z

MODAL ANALYSIS USING EMA BROBAND

← Older revision		Revision as of 09:28, 17 July 2020
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	In the operation tree:		In the operation tree:

	# select EMA Broband (A red icon appears near the method),		* select EMA Broband (A red icon appears near the method),
	# the MIF is displayed,		* the MIF is displayed,
	# Select a large frequency band by positioning the cursors and double click to fix them (a black line between the 2 cursors appears),		* Select a large frequency band by positioning the cursors and double click to fix them (a black line between the 2 cursors appears),
	# click on start identification		* click on start identification

	[[Image:Modal_practical_12.png\|framed\|none]]		[[Image:Modal_practical_12.png\|framed\|none]]
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	# Preliminary determination of the number of modes in the selected frequency band according to the MIF plot, and fill it in the edit box of "Preset Modes No." Then the BroBand software will calculate a default "minimum order" according to this number. The relationship between "Preset Modes No." and "Minimum Order" is: minimum order = (preset modes No)*Ni/2, where Ni means the number of input. Change the number of "Order Span" if necessary. The BroBand software will estimate the poles with a range of system order from "Minimum Order" to "Maximum Order", where Maximum order= Minimum order <nowiki>+</nowiki> Order Span-1. The default order span is 12.		* Preliminary determination of the number of modes in the selected frequency band according to the MIF plot, and fill it in the edit box of "Preset Modes No." Then the BroBand software will calculate a default "minimum order" according to this number. The relationship between "Preset Modes No." and "Minimum Order" is: minimum order = (preset modes No)*Ni/2, where Ni means the number of input. Change the number of "Order Span" if necessary. The BroBand software will estimate the poles with a range of system order from "Minimum Order" to "Maximum Order", where Maximum order= Minimum order <nowiki>+</nowiki> Order Span-1. The default order span is 12.

	# Modal identification		* Modal identification
	Press the button of "Start Modal ID" to obtain frequency stability diagram. This operation might take a little longer time to finish a complex structure with large number of modes and measurement coordinates. In the stability diagram, a shape symbol represents one pole. A pole in this diagram may represent a physical (i.e. structural) mode or a spurious (or noise) mode. It is normally not difficult to distinguish physical/structural) mode from spurious/noise mode by the distribution of poles. Generally speaking, a physical/structural mode can be identified in each proper number of order, while for a spurious/noise pole it usually is not the case. There are five kinds of symbols to indicate the poles:		Press the button of "Start Modal ID" to obtain frequency stability diagram. This operation might take a little longer time to finish a complex structure with large number of modes and measurement coordinates. In the stability diagram, a shape symbol represents one pole. A pole in this diagram may represent a physical (i.e. structural) mode or a spurious (or noise) mode. It is normally not difficult to distinguish physical/structural) mode from spurious/noise mode by the distribution of poles. Generally speaking, a physical/structural mode can be identified in each proper number of order, while for a spurious/noise pole it usually is not the case. There are five kinds of symbols to indicate the poles:

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	[[Image:Modal_practical_25.jpg\|framed\|none]]		[[Image:Modal_practical_25.jpg\|framed\|none]]

	# Auto selection of structural modes		* Auto selection of structural modes
	Press the button of "Auto Selection" or		Press the button of "Auto Selection" or [[Image:Modal_practical_26.png]], the OM2 selects the physical/structural modes automatically. While move the mouse cursor on a pole, the modal frequency and damping ratio corresponding to this pole will be shown. You can move the mouse on different poles to check the stability via small change of the modal frequency and/or damping ratio.
	[[Image:Modal_practical_26.png~~\|framed\|none~~]]
	, the OM2 selects the physical/structural modes automatically. While move the mouse cursor on a pole, the modal frequency and damping ratio corresponding to this pole will be shown. You can move the mouse on

	~~different poles to check the stability via small change of the modal frequency and/or damping ratio.~~

	~~----~~

	[[Image:Modal_practical_27.jpg\|framed\|none]]		[[Image:Modal_practical_27.jpg\|framed\|none]]

	==
	[[Image:Modal_practical_11.png\|framed\|none]]		[[Image:Modal_practical_11.png\|framed\|none]]

	Note: Manual selection of structural modes: a pole can also be manually selected by clicking it or deselected it by same operation. A selected pole will be marked with a shape symbol==		Note: Manual selection of structural modes: a pole can also be manually selected by clicking it or deselected it by same operation. A selected pole will be marked with a shape symbol

	# Mode shapes calculation		* Mode shapes calculation
	Press the button of "Calc. Modeshape" to confirm the pole section and BroBand software start to estimate the mode shapes and to calculate the synthesized FRFs.		Press the button of "Calc. Modeshape" to confirm the pole section and BroBand software start to estimate the mode shapes and to calculate the synthesized FRFs.

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	[[File:animate.png\|framed\|none]]		[[File:animate.png\|framed\|none]]



	== MODAL VALIDATION ==		== MODAL VALIDATION ==

Lmagimel: /* OPERATING DEFLECTION SHAPE */

2020-07-17T07:26:28Z

OPERATING DEFLECTION SHAPE

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 ===OPERATING DEFLECTION SHAPE===
 In the operation tree, double click on `ODS: Freq Domain   The following interface is displayed.
 On the left, the Modal Indication Function (MIF) shows the modes in the frequency band. Position the cursor on the peaks and visualize the corresponding mode shapes on the right.
+[[Image:Modal_practical_04.jpg|framed|none]]
 ==MODAL ANALYSIS USING EMA BROBAND==

Lmagimel at 07:16, 17 July 2020

2020-07-17T07:16:52Z

← Older revision		Revision as of 09:16, 17 July 2020
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			==Download==
			Download the data of the project [https://orossas.sharepoint.com/:u:/g/support/ER5_KKas6Y9Fm2neEIlNXt4BR5N3qnpI_3kIWyGylOCrXA?e=HeBoff here].

	==Create a new project==		==Create a new project==
	- Open the software<br>		- Open the software<br>

Lmagimel: /* DATA IMPORT AND READING */

2020-07-17T07:12:36Z

DATA IMPORT AND READING

← Older revision		Revision as of 09:12, 17 July 2020
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	==DATA IMPORT AND READING==		==DATA IMPORT AND READING==

			===Data import===
	For this demo, use the data file `CANTILEVER HAMMER DATA.uff<nowiki>’</nowiki> containing the Frequency Response Functions acquired with one impact hammer and 2 accelerometers.		For this demo, use the data file `CANTILEVER HAMMER DATA.uff<nowiki>’</nowiki> containing the Frequency Response Functions acquired with one impact hammer and 2 accelerometers.

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	By right clicking on the graph and selecting `Showed Series…<nowiki>’</nowiki>, you can display several FRFs on the same graph for comparison.		By right clicking on the graph and selecting `Showed Series…<nowiki>’</nowiki>, you can display several FRFs on the same graph for comparison.


	==MODAL IDENTIFICATION==		==MODAL IDENTIFICATION==

Lmagimel: /* GEOMETRY BUILDING */

2020-07-17T07:12:02Z

GEOMETRY BUILDING

← Older revision		Revision as of 09:12, 17 July 2020
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	Regarding the axis definition for the acquisition, 2 local coordinates systems should be added respectively on the nodes of line 1 and 2.		Regarding the axis definition for the acquisition, 2 local coordinates systems should be added respectively on the nodes of line 1 and 2.

			In the `config review<nowiki>’</nowiki> select the nodes of lines 1. Right click and select `Assign Coord.<nowiki>’</nowiki>
	[[Image:Modal_practical_02.jpg\|framed\|none]]		[[Image:Modal_practical_02.jpg\|framed\|none]]

	In the ~~`config review<nowiki>’</nowiki> select~~ the ~~nodes of lines 1. Right click and select `Assign Coord.<nowiki>’</nowiki>~~		To reproduce the experimental conditions, enter the following parameters

	[[Image:Modal_practical_09.jpg\|framed\|none]]		[[Image:Modal_practical_09.jpg\|framed\|none]]

	~~To reproduce the experimental conditions, enter the following parameters~~


	In the `Config review<nowiki>’</nowiki> select the nodes of line 2. Right click and select `Assign Coord.<nowiki>’</nowiki> Enter the following parameters		In the `Config review<nowiki>’</nowiki> select the nodes of line 2. Right click and select `Assign Coord.<nowiki>’</nowiki> Enter the following parameters
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	Delete the coordinates systems 1 and 2 in `config review<nowiki>’</nowiki> /coordinates		Delete the coordinates systems 1 and 2 in `config review<nowiki>’</nowiki> /coordinates

	*
			*Results
	[[Image:Modal_practical_03.png\|framed\|none]]		[[Image:Modal_practical_03.png\|framed\|none]]

	~~Results~~

	==DATA IMPORT AND READING==		==DATA IMPORT AND READING==