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Sound Intensity Manual (view source)

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(Created page with "<font color="#4F81BD"><font size = "6">SOUND INTENSITY<br>InstallATion Guide</font></font> ---- ====Equipment required for the installation==== Software CD containing OROS S...")
 
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* Manually retrieve the values of the dynamic capability index from the file saved in the <font color="#0000FF">'''Analyzer''' </font>set up configuration.
* Manually retrieve the values of the dynamic capability index from the file saved in the <font color="#0000FF">'''Analyzer''' </font>set up configuration.
* It is also possible, pressing the lower button, to get (reset) the default PRI spectrum saved in the Equipment Set-Up Area.
* It is also possible, pressing the lower button, to get (reset) the default PRI spectrum saved in the Equipment Set-Up Area.
==part2==
==part3==
==Sound Power using ISO 9614 Part 1==
Sound Power is calculated with the '''Main Mode '''on (Cf. Section 2)
To access the '''Result''' analysis, click on the '''ISO part 1 Results''' and select the correct item among (see Fig. 56):
* '''Time variability Index F1'''
* '''ISO Flowchart'''
* '''Sound Power computation'''
''
[[Image:SI_part3_01.gif|framed|none]]
''
''ISO part 1 Results''
===F1 Index===
Before starting the sound power determination, according to the ISO 9614-1 Standard, you will have to determine the temporal variability of the sound emitted by the sound source. In this case you should prepare at first a set of measures and import them into the program.
The first step is to select a surface in the tree structures placed on the left part of the window.
The best choice is to use the real time acquisition. In this case, select a column to import data into it. Then pick the '''Octave band real time''' command from the acquisition menu.
''
[[Image:SI_part3_02.jpg|framed|none]]
''
''Real time F1 Acquisition''
Pressing the '''Start''' button the acquisition goes on until the analyzer reaches the total average time. Then you can store the measurements by pressing the '''Save''' button. Repeat the procedure until the total number of samples is reached.
To set up the acquisition parameters click with the right mouse button on the real time acquisition window and select from the pop-up menu the '''Instrument set-up''' item.
''
[[Image:SI_part3_03.png|framed|none]]
''
''F1 index table for bottom surface''
When you have finished the acquisition you can come back again in the '''ISO Part 1 Results''' menu and select from the '''Computing''' menu "Verify all F1 indexes". The program will compute this index for all the surfaces and will show the index value at each frequency for all the surfaces. If the Standard requirements are not met for some frequencies, then the program will show the correspondent F1 value in a red cell. Otherwise the cell will be marked in green.
===ISO 9614-1 Flowchart===
The field indicators described in the ISO 9614-1 Standard, compulsory for the accuracy determination process, can be accessed by the '''Analysis''' menu once the user has imported all the data related to the model. To make the program perform the calculations required, the user has to access the menu "'''Computing'''" and run the command "'''Verify ISO Indexes'''".
* It shows the criteria for both each surface and also for the whole measurement surface
* One can also modify the choice of the accuracy grade after the measurement and see its effect on the criteria requirements of the ISO 9614 standards.
* One can also see directly the (N-CF<sub>4</sub><sup>2</sup>) result and see how close it comes to 0.
By selecting a surface contained in the tree structure on the upper left part of the window, the user can show the related flowchart and the values for the four indexes F1, F2, F3 and F4. In case of non-conformity with the accuracy determination process described in the ISO standard, the frequency and the index which are not up to the Standard requirements, lights up in red and the flowchart shows the action the user has to undertake to reach the grade of accuracy he wants (see Fig. 59).
''
[[Image:SI_part3_04.png|framed|none]]
''
''Flowchart for the accuracy determination process''
Please, remember that the field indicators automatically take into account the different spacers used during the determination for the different frequency ranges.
In the particular case in which the Ld value at the considered frequency is less than zero (this situation may arise if the PRI combined with the accuracy grade, the selected spacer and the environment conditions ), the software highlights the F2 cells with the yellow color (and if the user select the segment, the software highlights the field "Ld." under the "F2" field in yellow also): this fact warns the user to check the consistency and correctness of the Capability Index (in relation to the PRI).
''
[[Image:SI_part3_05.gif|framed|none]]
''
''Capability index check''
===Sound Power===
The '''Analysis''' menu contains also the command to enter the sound power result section. This part of the program gives the user a complete insight of the sound power radiated from the source and a ranking of the measurement surfaces. The tree structure can be browsed to show the emission spectrum of the overall measurement surface or the sound power spectra of the other surfaces enveloping the sound source.
The bars and the relevant values shown in the right lower part give a more practical insight of the power levels associated to the surfaces and express also the numerical value for each of them. A tick in the lower part of the window enables the user to choose if he wants to keep into account also the frequency bands not in accordance with the standard requirements or to discard them from the computation and the visualization. In the lower left part of the window the user can choose if he prefers to
* Show the overall power values expressed in terms of Linear or "A" weighted sound power levels <nowiki>[</nowiki>dB (L) or dB (A)<nowiki>]</nowiki>.
* Include or not the 8k Hz and 10 kHz bands in the power computation (the standard limits the power computation at 6.3 kHz)
* Exclude or not, in the power computation, the bands not verified by the indicators
* Exclude or not, in the power computation, the segments previously disabled manually (graphical selection).
[[Image:SI_part3_06.png|framed|none]]
''Sound power level determined for a measurement surface <nowiki>[</nowiki>dB<nowiki>]</nowiki>''
There are three menus in the main bar allowing the user to perform several actions:
* The '''File / Print report''' menu creates a standard report containing the relevant data of the project and the power results for the overall surface enveloping the sound source.
* The '''File / Export File''''' ''and'' '''''Copy to clipboard''' options enable the user to make a copy of the graph and to export it in a report.
In the Display menu the user can set-up the histogram in such a way to show the spectrum as power levels expressed in Watt or in dB. To switch from one kind of representation to the other select the right option from the '''Display / Units''' menu. With the '''Display / Label''' command the user can visualise the labels showing the numerical values for each bar of the spectrum.
You can zoom the diagram by clicking with the left mouse button on the desired position and dragging a window from the upper left side to the lower right side of the portion you want to enlarge. To unzoom just drag a window from the lower right to the upper left side.
''
[[Image:SI_part3_07.png|framed|none]]
''
''Labels and linear power spectrum <nowiki>[</nowiki>Watts(A)<nowiki>]</nowiki>''
==Sound Power using ISO 9614 Part II==
The tools described in this section are available when the corresponding option was purchased.
===Settings===
Before starting a new project using the ISO part 2 option, the user has to organize the application trough the '''SET UP''' menu. As shown in the following window, (bottom part of '''''Analysis''''' Tab) the user has to set the ISO Part field to "ISO Part 2". According to ISO 9614-2 standard, only Engineering and survey methods are available.
The program functionalities are the same as illustrated in the previous chapters, but the flowchart, the measurement mode and measurement implementation follow the specifications of the ISO 9614-2 standard.
''
[[Image:SI_part3_08.png|framed|none]]
''
''Analysis set up for ISO Part 2 determination''
In particular, the '''ISO part 2 Result''' menu is available. Using this menu, the user can access the '''''Flowchart''''' and the '''''Sound Power determination''''' sub-menus.
''
[[Image:SI_part3_09.gif|framed|none]]
''
''Menu for ISO part 2 Results''
----
===ISO 9614-2 Flowchart===
According to the above Standard, the user has to perform two sound power level measurements for each surface, scanning each area or segment by means of two orthogonal paths.
For this purpose the user has to apply the real time acquisition procedure.
''
[[Image:SI_part3_10.png|framed|none]]
''
''Orthogonal scanning paths''
Once performed the first sound power level measurement (first scanning direction), the user has to:
* Verify the Flowchart.
* Set up the '''''Reference Sound Power''''' data, using the relevant command in the '''Computing''' menu.
For each sub – surface and for each frequency band, the flowchart shows the indexes values and, in case of failure, the actions the user has to undertake in order to fulfill the standard requirements.
In this way the data acquired during the first scan are transferred in a buffer, ready to be used for the second part of the determination process.
At this time the user has to perform the second power level measurement and then test again the determination process using the '''''Verify ISO Part 2''''' indexes command.
If the ISO indexes meet the standard requirements and the flowchart is light up in green, the user can close the Flowchart window and access the '''''Sound Power calculation''''' menu to compute the Sound Power Level Values. Otherwise it should be necessary to repeat the procedure by carrying out a second scan.
For this purpose, under the '''File''' menu it is possible also to '''save''' and '''load reference files''' for further analysis.
''
[[Image:SI_part3_11.png|framed|none]]
''
''Flowchart for ISO Part 2 determination process''
===Sound Power level calculation===
Once verified the flowchart, the user can access the sound power determination area of the application trough the '''''ISO Part 2 / Sound Power menu'''''.
''
[[Image:SI_part3_12.jpg|framed|none]]
''
''1/3 octave sound power level calculation''
In the left part of the window the user can easily see the sound power level value obtained for each measurement surface and for the overall surface. In the right part is shown a graph of the 1/3 octave sound power spectrum referred to the surface selected in the left part.
The user can choose to show '''Linear''' or "'''A weighted'''" data and to '''exclude''' or '''include''' '''not ISO verified bands''' selecting the relevant option in the lower part of the window. The graph will update accordingly.
Clicking on the graph area with the right mouse button, several options become available:
* '''Y scale''' (Auto zoom, Fixed, De-zoom),
* '''Export Image File…''' (to export the window image in bitmap or metafile format),
* '''Copy to Clipboard''' (to copy to clipboard the window image).
Note that it is always possible to zoom the graph by clicking with the left mouse button and dragging the cursor from the left to the right side.
To pan the view click the right mouse button and drag the cursor. To de-zoom use the relevant command or drag the cursor from the right side to the left side holding the left mouse button down.
''
[[Image:SI_part3_13.gif|framed|none]]
''
''Visualization options for the sound power spectrum''
Concerning the menus, several alternatives are available:
'''File''':
:'''''Print Report''''': to print a standard report concerning the sound power determination data;
:'''''Export image file''''': to export the window image in bitmap or metafile format;
:'''''Copy to clipboard''''': to copy into clipboard an image of the graph;
:'''''Exit''''': close the window.
'''Display''':
:'''''Units''''': to switch between
{|border="0" cellspacing="2" width="100%"
|&nbsp;
|&nbsp;
|dB scale
|-
|&nbsp;
|&nbsp;
|Watt scale
|}
'''''Label''''' (toggle on – off power values on the graph)
'''''Tree Bar length'''''
:* 1
:* 1.5
'''Results''':
:'''''Compute Sound Power''''': Useful to compute again the overall sound power level and verify the determination process.
----
==Reference Manual: Menus Organization==
The menu bar is placed in the upper part of the screen which contains the following menus:
''
[[Image:SI_part3_14.gif|framed|none]]
''
''Menus Organization''
* '''''File'''''
* '''''Edit'''''
* '''''View'''''
* '''''Set Up'''''
* '''''Acquisition'''''
* '''''ISO Part 1 Results'''''
* '''''Tools'''''
* '''''Help'''''
The meaning of these menus is explained in the following sections.
===File Menu===
This menu contains the following commands:
* '''New project''': open a new project,
* '''Open project''': open an existing project,
* '''Save Project''': save the current project,
* '''Save Project as…''': save the project in the position and with the name specified by the browser,
* '''Export Image File''': you can export an image in BMP or JPG format,
* '''Print Report''',
* A list of the latest opened projects,
* '''Exit''': quit the program.
''
[[Image:SI_part3_15.jpg|framed|none]]
''
''File Menu Organization''
===Edit Menu===
It enables the user to show and set up several parameters:
* '''Properties'''
''
[[Image:SI_part3_16.gif|framed|none]]
''
''Edit – Properties Menu''
* '''Frames''': by using the table shown below the user can set up the frames properties.
''
[[Image:SI_part3_17.png|framed|none]]
''
''Frame graphic properties''
In this case it is possible to decide to hide or show a frame, his edge and grid. The user can also show the frame name on the display or decide to change the frame color.
* '''Surfaces''': as stated above, but it is also possible to show the numeric value together with the pressure level measured for the segment (Label), to change the face or the grid color and show the sequence the program will use to import acoustic data on the selected surface (Mfill).
''
[[Image:SI_part3_18.png|framed|none]]
''
''Surface graphic properties''
* '''Selection''': this command can be used when it is necessary to choose on what the user wants to perform a command.
''
[[Image:SI_part3_19.gif|framed|none]]
''
''Edit – Selection Menu''
* '''Surface only'''
* '''Frames only'''
* '''Aids''': this is an advanced set up for the user who wants to edit the display in a different way from the standard one.
''
[[Image:SI_part3_20.gif|framed|none]]
''
''Edit – Aids Menu''
* '''Angle bars''': useful to rotate the objects along the Z axis and the build plane;
* '''Zoom bars''': can be used to change the observer<nowiki>'</nowiki>s point of view.
----
===View Menu===
This menu enables the user to choose between several different kinds of view:
''
[[Image:SI_part3_21.gif|framed|none]]
''
''View Menu''
* '''2D''': Left, right, up, down, front, back surfaces,
* '''3D isometric''': it puts the objects in a standard three dimensional point of view,
* '''Refresh''': the objects on the screen are refreshed with the new setting,
* '''Appearance''': the user can show the surfaces using four different kinds of representation.
[[Image:SI_part3_22.gif|framed|none]]
''View – Appearance Menu''
* '''Monochromatic''';
* '''Measure''': each segment has an associated color depending on the measured pressure level;
* '''Smooth''': linear interpolation of the color scale between two adjacent segments;
* '''ISO 9614 Index''': green: OK, red: index failure.
===Set UP Menu===
This menu enables the user to choose between two different set up:
''
[[Image:SI_part3_23.gif|framed|none]]
''
''Set-Up Menu''
* '''Equipment'''
* '''Analysis'''
The meaning of these menus has just been explained in the previous sections.
The user has to set up:
* The general data about the title, the project engineer and the date of issuing of the file (as info);
* The required grade of accuracy, the bandwidth and the frequency range of interest (compulsory);
* The environmental data during the measurements (as info).
===Acquisition===
In the acquisition menu, the user can find the commands to:
* Perform a level calibration
* Perform a phase calibration
* Perform a PRI Index Acquisition for the instrumentation
* Start the real time Octave Band Acquisition
* Start the real time Narrow band Acquisition
''
[[Image:SI_part3_24.gif|framed|none]]
''
''Acquisition Menu''
===ISO Part 1 Results===
The meaning of the command explained in this subsection has been explained in earlier chapters. Please refer to the relevant sections.
''
[[Image:SI_part3_25.gif|framed|none]]
''
''ISO Part 1 Results Menu''
* '''F1 Time Variability'''
* '''ISO Flowchart'''
* '''Sound Power'''
===Tools Menu===
In this menu, you<nowiki>'</nowiki>ll find out the commands to:
''
[[Image:SI_part3_26.gif|framed|none]]
''
''Tools Menu''
* '''Parallel Space'''
* '''Multi-frequency'''
* '''Off-line spectrum'''
* '''Options''': The options are represented in the following tables
{|border="2" cellspacing="0" cellpadding="4" width="100%"
|align = "center"|
[[Image:SI_part3_27.jpg|framed|none]]
|align = "center"|
[[Image:SI_part3_28.jpg|framed|none]]
|align = "center"|
[[Image:SI_part3_29.jpg|framed|none]]
|-
|align = "center"|
[[Image:SI_part3_30.jpg|framed|none]]
|align = "center"|
[[Image:SI_part3_31.jpg|framed|none]]
|align = "center"|&nbsp;
|}
In the '''Graphics''' tab is possible to set-up the perspective type, the wire frame width and the limits for the fixed zoom of the windows used during real time acquisition.
The '''Dynamic view''' tab is functional to the representation type during Fast view, Editing and Default mode.
In the '''File system''' tab the user can set-up the number of last edited projects visible in the File Menu and reset recent files.
The '''Colors''' tab can be used to change the layouts of the windows for:
* the spectrum representation,
* the surface representation,
* the frame representation,
* the colors for the active selection,
* the colors used during the Graphic Editor Mode,
Finally, in the '''Units''' tab, is provided a collection of the Physic Units used by default during program operation.
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