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EDM Modal: Overview
Engineering Data Management (EDM) is a PC-based software program designed for real-time data management and processing. This easy to use, Windows-native software manages the communication between the PC and all Crystal Instruments hardware platforms.
EDM Modal is a complete Modal Testing and Modal Analysis suite for Experimental Modal Analysis (EMA). EDM Modal was developed based upon the sophisticate technologies of modern modal analysis theory and technique. With its intuitive controls and powerful features, EDM Modal is the ultimate tool for modal analysis applications. An intuitive interface allows users to manage highly complicated tests that can involve hundreds of measurement points and multiple excitations. This interface also allows for simple tests to be conducted quickly and with little effort. Regardless of how complicated the modal test is, EDM Modal provides exactly the right tools to achieve your goal.
To successfully acquire testing data, it is essential to properly book-keep the Degree of Freedoms (DOFs) of the test structure. The Geometry Editor handles all types of structure modeling and supports all types of coordinate systems. Using the concept of ‘components’, parts of a complicated structure can be built simply and then integrated into the geometric model. Inside the Input Channel Setup window, the measurement points and their corresponding directions can be defined. Once the test is started, the measurements will proceed through all the test points, as defined by the Degree of Freedom (DOF) information for each measurement point.
To acquire the FRF signals, there are several methods per excitation arrangement. The usual methods involve measuring the excitation along with the response signals. Included methods are hammer impact testing or modal shaker(s) testing. When using a modal shaker, the drive signal can be random or sine. Under certain circumstances, the excitation is not available or difficult to measure. In these cases, apply the response-only modal testing method or Operational Modal Analysis to take use of the ambient excitation or machinery operating status.
Modal parameter identification is at the heart of modal analysis. EDM Modal employs several curve fitting methods for modal parameter identification. The Least-Squares Complex Exponential (LSCE) method is implemented for the pole (natural frequency and damping factor) identification of single-reference Frequency Response Function (FRF) cases. For multiple-reference (Multiple Input/ Multiple Output or MIMO) testing cases, the corresponding Poly-Reference Time Domain (PTD) method can be used. With the knowledge of the Modal Participation Factor (MPF) from multiple reference FRF data, closely-coupled modes can be isolated. For mode shape calculation, the renowned Poly-Reference Frequency Domain method (PFD) is used, which is very intuitive.
The animation tool is a powerful visualisation facility that simulates the mode shapes of the device under test, allowing users to study and understand large amounts of data through a 3-dimensional animated display. The animation module can apply color contours to the surfaces of the geometry model to help visualise deflections in a 3-dimensional space. Free-form Deformation (FFD) enhances the mode shape animation, resulting in smoother and more realistic mode shape displays. Using the same geometry model, Operational Deflection Shapes (ODS) can be displayed using measured time or spectrum operating responses.
EDM Modal supports the following applications:
- Geometry creation/import/export/animation
- Operational Deflection Shape analysis
- Supports Spider Systems with up to 512 input channels
- Impact hammer modal testing
- Single or multiple shaker modal testing
- Single Input Multiple Output swept sine modal testing
- Single Input Multiple Output stepped sine modal testing
- Multiple Input Multiple Output stepped sine modal testing
- Operational Modal testing and analysis
- Single reference modal analysis
- Poly reference modal analysis
- Poly-X (p-LSCF) modal analysis
- Measurement data review
- Reporting to Microsoft Word
EDM Modal is a complete Modal Testing and Modal Analysis suite for Experimental Modal Analysis (EMA). It was developed based upon the sophisticated technologies of modern modal analysis theory and technique.
Geometry & ODS
EDM Modal Geometry/ODS/Animation is the primary EDM Modal software module, and is required for every EDM Modal system. This option provides fast and efficient structural model generation and full 3D visualisation of test and analysis results.
Hammer Impact Testing
EDM Modal Hammer Impact Testing provides the necessary features for a single-operator experimental modal test. The Hammer Impact GUI features an intuitive step-by-step process, allowing a user to easily go through the setup and then the testing.
SIMO FRF Testing includes a dedicated test setup and operation process flow using a single shaker to acquire FRF signals. Using a large channel count data acquisition system, this shaker excitation method provides much higher test execution efficiency for the FRF measurements.
MIMO FRF Test
MIMO FRF Testing includes a dedicated test setup and operation process flow using multiple simultaneous shakers to acquire FRF signals. With multiple excitation highly couple modes can be identified using the Poly-reference method.
SIMO Swept Sine Testing
EDM Modal SIMO Swept Sine Testing includes a dedicated test setup and operation process flow using a single shaker outputting a swept sine wave to acquire FRF signals.
SIMO Stepped Sine Testing
EDM Modal SIMO Stepped Sine Testing includes a dedicated test setup and operation process flow using a single shaker outputting a stepped sine wave to acquire FRF signals.
MIMO Stepped Sine Testing
EDM Modal MIMO Stepped Sine Testing includes a dedicated test setup and operation process flow using multiple shakers outputting sine waves to acquire FRF signals.
Operational Modal Testing
EDM Modal Operational Modal Testing (OMA Testing) includes a dedicated test setup and operation process flow using ambient vibration data. The Cross Power Spectrum signals are used to identify the modes.
Modal Analysis (including Advanced Modal Analysis and Premium Modal Analysis)
EDM Modal Standard Modal Analysis provides the user with a complete arsenal of tools, from FRF data selection and parameter identification to results validation and mode shape animation. EDM Modal Premium Modal Analysis includes all the features of Standard & Advanced Modal Analysis.
EDM Modal Correlation Analysis allows the user to correlate two modal models; EMA and/or FEA models. Comparing the experimental data with that acquired through finite element analysis helps in validating the test results.
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