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New Frequency Domain Operating Deflection Shapes Task

In ARTeMIS Modal 6.0, we have updated frequency domain Operating Deflection Shapes task. The shapes are now estimated using Phased Assigned Spectra’s allowing read-out of Peak, Peak-to-Peak, RMS and Power values at all measured DOF’s. User is free to select units and measurement type (displacements, velocities, accelerations). Please have a look at the video at www.svibs.com/ODS.

 

New Instruction Videos for Multi-Setup OMA Testing

 

We have now added a series of videos showing how to perform multi-setup testing using ARTeMIS Modal. Please have a look at the videos at www.svibs.com/HowTo.

Next ARTeMIS User Training Course

The next annual user training course will take place in Aalborg, Denmark on October 29-30, 2019.

This 2-day course is for the new as well as experienced users that would like to be updated on Operational Modal Analysis and Experimental Modal Analysis as well as the latest features of ARTeMIS Modal software.

The course will be held at Comwell Hotel Hvide Hus in Aalborg, Denmark. Both days we start at 9.00 and end at 17.00. There will be lunch and coffee breaks during the day and free WiFi internet access. The course instructor is Dr. Palle Andersen, CEO at Structural Vibration Solutions A/S.

More information is available at www.svibs.com/News.

Operational Modal Analysis Course

– Similarities and Differences to Classical Modal Analysis


September 30 – October 1, 2019, Ingolstadt, Germany.

This 2-day course will give a general insight to the theory and practice of Experimental Modal Analysis. The similarities and differences between Operational Modal Analysis and Classical Modal Analysis will be the main focus. There will be practical demonstrations and hands-on exercises during the course. The social event is a visit to the Munich Octoberfest.

More information is available at www.svibs.com/News.

 

ARTeMIS Modal 6.0 Released

 

ARTeMIS Modal 6.0 has now been released and includes many new features and enhancements. Existing users should log in at www.svibs.com and download the latest build 6.0.0.2. If you are not already a user and wish to try it out, please go to the Download section to get a 30 days trial version.

New features and layout

 

ARTeMIS Modal 6.0 has many new exciting features. Some of these are

  1. Mode shape uncertainty estimation (SSI-UPCX only).
  2. Modal Alignment window for all estimators driven by a stabilization diagram.
  3. Automatic Mode Estimation in Frequency Domain Decomposition methods has been improved, and can now also be operated using a graphical slider for the MAC Rejection level.
  4. Data Acquisition plugins combined with EMA plugin enable impact testing directly in ARTeMIS Modal.
  5. Software platform now supports both Tabbed and SDI layouts.
  6. Multiple animations can now be exported automatically in AVI and GIF formats.

 

Please have a look at this YouTube video that introduces some of these new features:

 

ARTeMIS Modal 6.0

 

Figure 1: ARTeMIS Modal 6.0 – New features and layout.

Mode Shape Uncertainty Estimation in SSI-UPCX

 

From the release of version 6.0, mode shape uncertainties can now be estimated in the SSI-UPCX modal estimator. All modal parameters and their uncertainties can, as such now be estimated, presented and exported to third party software.

 

ARTeMIS Modal 6.0

 

Figure 2: Uncertainties of global modes estimated using SSI-UPCX estimator. Natural frequencies and damping ratios and their confidence bounds can be visualized in the Frequency vs. Damping diagram. Mode shape uncertainties are presented in the Complexity diagram where the real/imaginary confidence bound is presented for each DOF. Mode shape animations also includes an option to visualize the uncertainties. In the mode list all modal parameters, including the mode shape complexity, are accompanied by the estimated standard deviations.

Modal Alignments

 

In all the estimators that uses a stabilization diagram, it is now possible to view the modal alignments for the individual global modes. The modal alignments display the natural frequency, damping ratio and mode shape complexity respectively as a function of the state space model dimension.

 

ARTeMIS Modal 6.0

 

Figure 3: The top view depicts the modal alignments for the global mode selected below. The natural frequency, damping ratio and mode shape complexity development over increasing model dimensions are displayed along with estimated standard deviations (SSI-UPCX only).

Special ARTeMIS Bundle Offers – Valid until 31 March, 2019

 

If you are interested in Experimental Modal Analysis (EMA), with or without Direct Hardware Control, we are running a special limited offer, on all versions of ARTeMIS Modal.

 

Buying a license of any version of ARTeMIS Modal bundled with the EMA plugin and optionally a Direct Hardware Control plugin, can be done at a very affordable bundle price.

 

Please contact sales@svibs.com for more information or a quotation.

See you at IMAC-XXXVII and IOMAC-2019

 

We will be demonstrating all the new exciting features of ARTeMIS Modal 6.0 at the International Modal Analysis Conference (IMAC) in Orlando, Florida on January 28-31, in booth #213. We are also present at the International Operational Modal Analysis Conference (IOMAC) in Copenhagen, Denmark on May 13-15, 2019.

Next User Training Course

 

The next user training course will take place in Aalborg, Denmark on October 29-30, 2019.

 

This 2-day course is for the new as well as experienced users that would like to be updated on Operational Modal Analysis and Experimental Modal Analysis as well as the latest features of ARTeMIS Modal software.

 

The course will be held at Comwell Hotel Hvide Hus in Aalborg, Denmark. Both days we start at 9.00 and end at 17.00. There will be lunch and coffee breaks during the day and free WiFi internet access. The course instructor is Dr. Palle Andersen, CEO at Structural Vibration Solutions A/S.

 

Upcoming New Module – Experimental Modal Analysis

In ARTeMIS Modal 6.0, planned for a release in the second quarter of 2018, we are introducing a new module for Experimental Modal Analysis (EMA). The new module will support both hammer and shaker tests that deploy Frequency Response Functions (FRFs) obtained in one of the following ways:

  1. Direct uploading of the FRF’s from Universal File Format. In this case, some of ARTeMIS Modal tasks are either hidden or simplified. This also count for the Prepare Data Task as there is no signal processing to do.
  2. Upload of simultaneously measured input and output time histories into the Manage Measurement Task, then followed by the estimation of the FRF’s using either H1, H2 or Hv estimators. This is accomplished in the Prepare Data Task.
  3. Use the ARTeMIS Modal data acquisition plugins to measure input and output simultaneously then followed by the estimation of the FRF’s using either H1, H2 or Hv estimators as in (2).

Below a preview of this new module can be seen.

Experimental Modal Analysis of an Audi TT Car Body

 

The experimental tests presented here has been conducted at TH Ingolstadt, Faculty of Mechanical Engineering, Germany under the guidance of Professor J. Bienert, who is gratefully acknowledged.

 

The experimental campaign consist of impact (hammer) testing of an Audi TT car body, see a picture depicted below.

 

Audi TT Car Body

 

The car body was mounted free on four air cushions. Four references respectively impact points were excited with 14 accelerometers as responses. The data acquisition and processing of the FRF’s were made with a 24-channel data acquisition system. The FRF’s were stored in the four separate Universal File Format Files (Audi_TT_FRF_runX.unv) along with a test geometry in its own file (Audi_TT.unv).

Importing FRF’s into ARTeMIS Modal

 

Importing the FRF’s into ARTeMIS Modal starts with creating a new project using Universal File Format, which is illustrated in the picture below.

 

ARTeMIS Newsletter - January 2018 1

 

Once the files are uploaded, the geometry and FRF’s can be seen in the simplified Prepare Data task. The Data Organizer contains all four impact tests listed below each other, and the Geometry window visualize the positions and the directions of the response and reference channels. All the impact positions can be viewed by selecting the first item, All Test Setup, in the Data Organizer, illustrated below.

 

Data Organizer

 

The 14 response accelerometers are seen in blue, and the impact positions, indicated by a hammer symbol, are colored green.

Estimating Modes using Rational Fraction Polynomial – Z Domain

 

The modal parameters of the car body are computed with a Rational Fraction Polynomial estimator working in Z-domain. This estimator has been developed in cooperation with Politecnico di Torino, Dynamics and Identification Research Group (DIRG) at Department of Mechanical and Aerospace Engineering, Italy, the I4S Team at Inria, France and Aalborg University, Department of Civil Engineering, Denmark.

 

The estimator has been adapted, so it is operated in nearly the same way as the Stochastic Subspace Identification methods used for Operational Modal Analysis in ARTeMIS Modal.

 

The work flow is as follows:

  1. Select a maximum model order to initialize the estimation of the system matrices of the highest dimension for the subsequent computation of a lower model orders.
  2. Select the desired frequency band.
  3. Select a specific range of the model orders by dragging the mouse down on the stabilization diagram, or simply click the Estimate Models button to estimate all the model orders.
  4. Stable modes are found by a study of the natural frequencies, damping ratios and mode shapes (MAC and maximum modal complexity).
  5. Global modes are estimated based on the stable modes.

 

The figure below illustrates the analysis of the experimental test of the Audi TT in the frequency range from around 4 Hz up to 140 Hz. Maximum model order was set to 80, however only models up to 60 were estimated.

 

analysis of the experimental test of the Audi TT

Validating Modes with Other Estimators

 

The modes obtained from the RFP-Z estimator are validated using the standard tools available in ARTeMIS Modal. By selecting the Validation Task, the modes can be compared with the other estimators as well as imported results from any other modal analysis tools. Below we are comparing the RFP-Z modes with the modes obtained with a simple peak-picking tool already available in ARTeMIS Modal. It is based on the peak picking on the Complex Mode Indicator Function (CMIF).

 

ARTeMIS Newsletter - January 2018 2

We would appreciate your help!

 

If you are interested in helping us with testing the new EMA module, please contact us at info@svibs.com.


International Modal Analysis Conference (IMAC XXXVI)

 

We will be presenting the new RFP-Z estimator at the International Modal Analysis Conference (IMAC XXXVI) on February 12-15, 2018 in Orlando, Florida. See you in booth 213!

 


Next User Training Course – Sign Up Deadline is March 1, 2018

 

The next user training course will take place in Lisbon, Portugal, on May 7-8, 2018.

This 2-day course is for the new as well as experienced users that would like to be updated on Operational Modal Analysis technology as well as the latest features of ARTeMIS Operational Modal Analysis software.

Venue

The course will be held on May 7-8, 2018 at Hotel SANA Rex in Lisbon, Portugal. Both days we start at 9.30 and end at 17.00 on the first day and at 16.00 on the second. There will be lunch and coffee breaks during the day and free WiFi internet access. The course instructor is Dr. Palle Andersen, CEO at Structural Vibration Solutions A/S.

Programme

On day 1, you will get a comprehensive introduction to Operational Modal Analysis technology in general. During this introduction, the differences to the well-known input/output modal analysis will be described. Also the procedures for acquiring high quality measurements will be discussed in detail. We will help each other acquiring good measurements of different demo structures. The introduction is followed by a presentation of the user-friendly Frequency Domain Decomposition (FDD) technique, and we will analyze the acquired measurements as hands-on exercises. Finally, the two other FDD related techniques of ARTeMIS (Enhanced Frequency Domain Decomposition and Curve-fit Frequency Domain Decomposition) are introduced, and we will continue with hands-on exercises using these techniques.

On day 2, you will be introduced to Stochastic Subspace Identification (SSI) and the latest features available in ARTeMIS such as the ARTeMIS Modal Pro Plugins for SHM.

You will get course material as well as a 1-month free demo version of the ARTeMIS Modal Pro which we invite you to install on your own laptop for use during the hands-on exercises of the course.

Price

Attending the course will cost 750 EUR per person. Students get 50% discount.

Sign Up

Please download the registration form and send it by email to Structural Vibration Solutions at mo@svibs.com. We need your registration no later than March 1, 2018.

 

Lisbon, PortugalLisbon, PortugalLisbon, PortugalLisbon, Portugal

New Experimental Modal Analysis Plugin

 

We have now released a new plugin for Experimental Modal Analysis (EMA) that works with all versions of ARTMIS Modal (Basic, Standard, Pro). The plugin opens for frequency domain estimation of modal parameters from Frequency Response Functions (FRF’s) using either Complex Mode Indicator Function (CMIF) – Peak Picking or Rational Fraction Polynomial in Z domain (RFP-Z).

 

The FRF’s can either be imported through Universal File Format from third party solutions, see a worked example here, or by using the new Impact Testing module, see a worked example here.

 

The Impact Testing module is available if valid plugin licenses for a data acquisition system and Experimental Modal Analysis are present on the computer.

 

Experimental Modal AnalysisExperimental Modal Analysis

 

International Seminar on Modal Analysis Conference (ISMA 2018)

 

We will be presenting the new RFP-Z estimator and Impact Testing Module at ISMA conference on September 17-19, 2018 in Leuven, Belgium. See you in booth 14!

 

Next User Training Course

 

The next user training course will take place in Aalborg, Denmark on November 6-7, 2018.

This 2-day course is for the new as well as experienced users that would like to be updated on Operational Modal Analysis and Experimental Modal Analysis as well as the latest features of ARTeMIS Modal software.

 

Venue

 

The course will be held on November 6-7, 2018 at Comwell Hotel Hvide Hus in Aalborg, Denmark. Both days we start at 9.00 and end at 17.00. There will be lunch and coffee breaks during the day and free WiFi internet access. The course instructors are Dr. Palle Andersen, CEO at Structural Vibration Solutions A/S and Mr. Ilija Trenchevski, senior developer of ARTeMIS Modal at Structural Vibration Solutions A/S.

 

Programme

 

On day 1, you will get a comprehensive introduction to Experimental Modal Analysis (EMA) and Operational Modal Analysis (OMA) in general. During this introduction, the differences and similarities between EMA and OMA will be described. Also the procedures for acquiring high quality measurements will be discussed in details. We will help each other acquiring good measurements of different demo structures both for EMA and OMA applications. The introduction is followed by a presentation of the user-friendly Frequency Domain Decomposition (FDD) technique, and we will analyze the acquired measurements as hands-on exercises. Finally, the two other FDD related techniques of ARTeMIS (Enhanced Frequency Domain Decomposition and Curve-fit Frequency Domain Decomposition) are introduced, and we will continue with hands-on exercises using these techniques. The technical programme will end with the analysis of the acquired EMA data using the Complex Mode Indicator Function – Peak Picking method (CMIF).

 

We end day 1 at a restaurant in the old downtown of Aalborg.

 

On day 2, you will be introduced to the advanced OMA methods called Stochastic Subspace Identification (SSI) as well as the parametric EMA method called Rational Fraction Polynomial in Z-domain (RFP-Z) and the latest features available in ARTeMIS such as the Structural Health Monitoring plugins.

You will get course material as well as a 1-month free demo version of the ARTeMIS Modal Pro which we invite you to install on your own laptop for use during the hands-on exercises of the course.

 

Price

 

Attending the course will cost 950 EUR per person. Students get 50% discount. Book before August 31, 2018 and SAVE 10%!

Prices includes 25% Danish VAT (moms).

 

Sign Up

 

Please download the registration form and send it by email to Structural Vibration Solutions at mo@svibs.com. We need your registration no later than October 1, 2018.

Aalborg, DenmarkAalborg, DenmarkAalborg, DenmarkAalborg, Denmark

ARTeMIS Modal 5.2 Released

 

ARTeMIS Modal 5.2 has now been released and includes many new features and enhancements. Existing users should log in at www.svibs.com and download the latest build 5.2.1.1. If you are not already a user and wish to try it out, please go to the Download section to get a 30 days trial version.

 

Reduce Peaks tool for ARTeMIS Modal Pro

 

ARTeMIS Modal Pro 5.2 features a new tool for the reduction of undesired peaks from the structural response spectra. The tool can be used to reduce the influence of e.g. harmonic peaks originating from some rotating parts acting on the structure during a test. Likewise, it can be deployed to remove undesired modes. This particular application is beneficial in case of very strong modes being mixed with weak modes. In order to better estimate the weak modes the strong ones can simply be removed from the response data before conducting the modal analysis.

It integrates seamlessly with the automatic Harmonic Detection tool, that detects the harmonic peaks using a Kurtosis check on bandpass filtered time response. Read more >

 

New www.svibs.com Web Site

 

We have released a new web site that better supports desktop as well as mobile platforms. Please have a look at www.svibs.com

Important links are:

Customers can log into their accounts when using a desktop platform.

 

Next User Training Course

 

The next user training course will take place in Lisbon, Portugal, on May 7-8, 2018.

This 2-day course is for the new as well as experienced users that would like to be updated on Operational Modal Analysis technology as well as the latest features of ARTeMIS Operational Modal Analysis software.

 

Venue

 

The course will be held on May 7-8, 2018 at Hotel SANA Rex in Lisbon, Portugal. Both days we start at 9.30 and end at 17.00 on the first day and at 16.00 on the second. There will be lunch and coffee breaks during the day and free WiFi internet access. The course instructor is Dr. Palle Andersen, CEO at Structural Vibration Solutions A/S.

 

Programme

 

On day 1, you will get a comprehensive introduction to Operational Modal Analysis technology in general. During this introduction, the differences to the well-known input/output modal analysis will be described. Also the procedures for acquiring high quality measurements will be discussed in detail. We will help each other acquiring good measurements of different demo structures. The introduction is followed by a presentation of the user-friendly Frequency Domain Decomposition (FDD) technique, and we will analyze the acquired measurements as hands-on exercises. Finally, the two other FDD related techniques of ARTeMIS (Enhanced Frequency Domain Decomposition and Curve-fit Frequency Domain Decomposition) are introduced, and we will continue with hands-on exercises using these techniques.

On day 2, you will be introduced to Stochastic Subspace Identification (SSI) and the latest features available in ARTeMIS such as the ARTeMIS Modal Pro Plugins for SHM.

You will get course material as well as a 1-month free demo version of the ARTeMIS Modal Pro which we invite you to install on your own laptop for use during the hands-on exercises of the course.

 

Price

 

Attending the course will cost 750 EUR per person. Students get 50% discount.

 

Sign Up

 

Please download the registration form and send it by email to Structural Vibration Solutions at mo@svibs.com. We need your registration no later than March 1, 2018.

 

Lisbon, PortugalLisbon, PortugalLisbon, PortugalLisbon, Portugal