edm waveform editor manual.pdf

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EDM Waveform Editor

Manual

8/17/2012


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2 Crystal Instruments EDM Waveform Editor Manual

Information in this document is subject to change without notice. No part of this

document may be reproduced or transmitted in any form, for any purpose, without

the written permission of Crystal Instruments Corporation (Crystal Instruments).

By installing, copying or using the Software, the user agrees to be bound by the

terms of the Crystal Instruments End User License Agreement which is a legally

binding agreement between the user (the Licensee) and Crystal Instruments for

the Crystal Instruments software, which includes software components and tools,

and written documentation (Software).

Crystal Instruments makes no warranties on the Software, whether express or

implied, nor implied warranties of merchantability or fitness for a particular purpose.

Crystal Instruments does not warrant your data, that the software will meet your

requirements, or that the operation will be reliable or error free. The Licensee of the

Software assumes the entire risk of use of the Software and the results obtained

from use of the software. Crystal Instruments shall not be liable for any incidental or

consequential damages, including loss of data, lost profits, cost of cover, or otherspecial or indirect damages.

Copyright 2012 Crystal Instruments Corporation, all rights reserved.

All trademarks and registered trademarks used herein are the property of their

respective holders.


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Contents

INTRODUCTION 4

OPERATION AND LAYOUT 5

User Interface Layout ................................................................................................................................ 5

Parameter Configuration Window .......................................................................................................... 11General Options .................................................................................................................................. 12

Displacement Compensation .............................................................................................................. 12

Shaker Settings ................................................................................................................................... 14

Splice Options ..................................................................................................................................... 15

Graphical Editing Operations .................................................................................................................. 17

Signal Display ...................................................................................................................................... 18

Importing and Exporting Signals ......................................................................................................... 19


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Introduction

The Waveform Editor is used to directly modify time waveforms. It can splice, crop,

filter, and apply compensation to acceleration, velocity, and displacement

waveforms. It is different than the Post Analysis application in that it does not do

FFTs or any other form of higher analysis.


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Operation and Layout

User Interface Layout

When the application is first opened, the main user interface is as shown below.

Use the New Projecttoolbar button, or in the Project menu, to create a new

project. By default, a random spectrum signal will be generated. Without creating a

new project, a recently opened project can be opened by clicking on Recent Project

List. Another option is to open a WFE project file from the disk.


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The menu bar contains the following items:

Projectmenu:

New Project: Create a new project

Open Project: Open an existing project

Save Project: Save the current project

Save Project As: Save the current project in a new location


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Operationsmenu:

Undo: Cancel the previous action

Import Signal: Import a profile signal

Create From Model: Create a profile from a model

Cut Point: Delete the data between two cursors

Copy Points: Copy the signal data from selected area to the clipboard

Paste Left: Paste the signal data to the left profile

Paste Right: Paste the signal data to the right profile

Apply Compensation: Apply the compensation template to the profile signal

Decimation: Decimate, or downsample, the samples in the selection

Rescale: Rescale the profile

Global Settings: Change global settings

The Viewmenu opens to select Profile, Velocity, Displacement, PSD, or Histogram

windows.

The Layoutwindow adjusts the display window layout.


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The Reportmenu is used for generating MS Word reports.

The toolbar contains shortcut buttons of common operations.

The Folder Explorershows the local file system. It allows files anywhere on the local

disk to be accessed and displayed. When a folder is selected, the signal files and

WFE project files in it will be displayed on the right panel.

Double-click a WFE file to open the project; double-click a signal file to open the

signal data.

Clicking on an ATFX file will preview the attributes as shown below.


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The Work Treedisplays the profile and computed signals. Double-click any of these

to open a signal display window. Right-click on them to export to file or MS Excel.


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In the signal display area, two vertical cursors are used to define the range of dataoperations such as Copy, Paste, and Delete. The right-click menu includes the chart

control operation.


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The Control Panelcontains operation buttons, parameter display, and cursor data

display.

Parameter Configuration WindowClick the Configbutton to enter the parameter configuration window.


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General Options

Line number for spectral analysissets the number of spectral lines. More lines

increase the resolution of frequency data.

Bin Numbersets the resolution of histogram data.

Profile Quantitysets the quantity as acceleration, velocity, displacement, or

voltage.

Undo Max. Stepsets the number of cached operations for the Undo command

Start Average Framesets the starting frame of the average.

Compensation

Compensation involves modifying the time stream so it meets certain constraints in

velocity, displacement, or acceleration. Compensation operations include

Acceleration DC Removal, Velocity DC Removal, and High/Low/Band Pass Filter.

After the proper compensation template setup, one button can execute multipleoperations.

Acc. DC (Vel. Slope) Removesubtracts the DC component in the acceleration

waveform. This removes a slope trend from the velocity waveform. It is needed

when the raw data has an offset measurement error.


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Vel. DC (Disp. Slope) Removesubtracts the DC component in the velocity

waveform. This removes a slope trend from the displacement waveform. It is useful

when acceleration discontinuities are present. An acceleration discontinuity (a

sharp spike in acceleration) will generate an offset in the velocity profile which then

results in a slope in the displacement.

High Pass Filter suppresses low-frequency signals below the specified cutoff

frequency. This method is effective in reducing displacement but may also remove

desirable low frequency energy. The cutoff frequency should be set as low as

possible while still maintaining the displacement requirement.

Low Pass Filtersuppresses high-frequency signals above the specified cutoff

frequency. This does not have a major impact on the displacement or velocity

profile. It is useful in that it will help remove high-frequency components that are

undesirable in the acceleration waveform.

Band Pass Filter combines a Low-Pass and High-Pass filter.


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Shaker Settings

The Shaker Settings define the limits of the shaker that will be used to output the

waveform.


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Splice Options

The Splice operation is used to minimize boundary discontinuities when two pieces

of data are put together. Once enabled, the chosen Data Window will be applied to

the data array at both ends for the following cases:

A piece of data is appended to the previous segment during the file import

process.

A piece of data is inserted or pasted into an existing segment.

In the Splice Settings dialog you will be able to define the following: Data Window,

Overlapping, and Number of Windowing Points.


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Data Window

The user can choose different Data Window types to be used in the Splice

operation.

None Disables the Splice function

HanningUses a Hanning window during the Splice operation.

Triangle Uses a Triangular window during the Splice operation

Half Sine Uses Half Sine window during the Splice operation

Overlapping

With OverlappingTwo pieces of data will be put together with Data Window

overlapping. Note that the total length of the profile will be reduced after splicing.

No Overlapping DataWindows are not overlapped. The length of the profile will

not be altered.

Number of Windowing Points

The Number of Windowing Pointsallows you to define the length of the Data

Windowby number of points. Typically, the Number of Windowing Pointsis more

than 128.


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Graphical Editing Operations

There are a number of editing options for on-screen manipulation of imported

waveforms. These operations allow cleaning up of the waveform by deleting

unwanted data segments or changing the sequence of events in a waveform.

Copy and Delete Selection

After you have selected an interval from the waveform using two cursors, the Copy

and Delete functions become available to you from the Edit menu, by right mouse

clicking on the selected interval, or by using the toolbar buttons. These functions

allow you to copy the selected interval to the clipboard for pasting or simply to

delete the selection from the overall waveform. Note that Copy and Delete

functions apply only to the Profile Window.

Paste Selection

The Paste function allows you to paste a waveform interval that was previously

copied into the clipboard to a new location on the waveform. Once a waveforminterval has been copied to the clipboard, the Paste to Left and Paste to Right

functions become available to you from the Operating menu, by right mouse

clicking on the selected interval, or by using their respective icons, or by using the

buttons in the Control Panel. Note that Paste functions apply only to the Profile

Window.

Use a single cursor and scroll to point on the waveform where the clipboard

contents will be pasted.

Paste to Left pastes the selected waveform interval in the clipboard to the left side

of the cursor.

Paste to Rightpastes the selected waveform interval in the clipboard to the right

side of the cursor.

Undogoes back one step and undoes the last action performed.

Decimation

This operation keeps the signal time length the same and removes every other

sample to reduce the sampling rate by half.


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Rescale

This operation sets the scaling factor to increase or decrease the signal amplitude.

Signal Display

The Waveform Editor provides displays for simultaneous viewing of profile, velocity,

displacement and Histogram waveforms and Power Spectral Density of the

waveforms. The original, uncompensated, and compensated waveforms may beoverlaid. Also the shaker tolerances may be included to verify the acceptability of

the profile for use on a shaker system. Note that velocity and displacement

waveforms apply only to a profile given in acceleration.


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Importing and Exporting Signals

To import a time history waveform as the profile, click on Import Profilein the File

menu. This action will invoke the following dialog box:


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Use theFile Namefield, or the Browse button, to enter the file name for the data

to be imported. Once the Open command is given, the Waveform Editor will

automatically identify the data format and then import the data from the disk file.

The following data formats can be imported: ATFX, ASCII (CSV, TXT), UFF ASCII, UFF,

Binary, and TDM.

Once the data file has been selected, a few data parameters need to be defined.

Delta T (ms) specifies the sampling rate used for the imported data.


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Value Unitdefines the engineering units used for the imported data.

Digital Re-samplingallows you to set sampling rate different than the original

sampling rate. If Auto mode is set, the program will determine the best sampling

rate to use. If the waveform sampling rate exactly matches an available sampling

rate of the Crystal Instruments Vibration Control system, digital re-sampling is notrequired. However, if the imported data has a different sampling rate, digital re-

sampling is required to prevent distortion of the waveform shape during output.

Generally you should select Auto for the Sampling Freq (Hz) field.

Digital re-sampling is done internally by a 5th order filter. This high-order filter

ensures against the loss of signal information in the sampling bandwidth during re-

sampling. Be aware that if you choose to digitally re-sample the data at lower rate

than that used to acquire the data, signal aliasing may occur. A better method is to

use the digital low-pass filter and decimate options under Profile Compensation.

Import Methodcontrols how the imported waveform is combined with the existingprofile waveform. Replaceinitializes the waveform buffer and loads the new

waveform.Addsums the new waveform with the existing profile. From/At position

specifies the data point in the profile buffer to begin insertion of the new waveform

segment.

Create From Model

This button will create a profile from a mathematical model.


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Waveform Type includes Band-Limited Random, White Noise, Chirp, Sine, 24

Triangle Bursts, 48 Triangle Bursts, and Triangle.

Data Points is the total number of points in current profile.

Sampling Rate is the sampling rate in current profile.

RMS is the RMS value in current profile.

Left/Right Cutoff Frequency is the cutoff frequency on left/right band in current

profile.

Check the box to apply ramping window on both ends.

Save Signal/Spectrum

Signals can be saved as the profile signal can be exported to many different file

types as shown below.

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