20 February 2009
Welcome to our latest Newsletter about the Vibration & Environmental test world in addition to the latest information from m+p international.
The m+p international Newsletter is circulated exclusively to test engineers and managers involved in vibration test, data acquisition and signal analysis and hopes to bring you some useful technical snippets gleaned from around the world and from around the test and measurement industry. We always look forward to your inputs, send us your views to firstname.lastname@example.org.
m+p international has won a contract for an extremely unique classified test program from the US Navy. Although the specifics of the application are classified the system is unique in that it will test with 15 independent Modal Shakers supplied by The Modal Shop in Cincinnati and utilize some of the newest features in the SO Analyzer software suite. All 15 shakers can be driven by the single VXIbus mainframe containing four VT1434 digital-to-analog cards as well as two VT1432 cards for the acquisition of the FRF, Coherence, PSD, and Time Domain data. Each of the 16 outputs is uncorrelated and independent and can deliver Sine, Random, Shock, as well as Arbitrary Wave Forms from Wav files. The SO Analyzer, in addition to handling the 16 uncorrelated outputs, can provide closed-loop control of 4 of the outputs for Random and Sine testing greatly enhancing Multi-Input/Multi-Output Modal Testing.
2. Combined Acoustic/Vibration Controller Solution
Lockheed Missiles and Fire Control Environmental Laboratory, Grand Prairie, TX utilize a unique m+p solution which meets their requirement for a closed-loop controller for both the vibration and acoustic environments.
Jeff Kirk (shown above), Senior Staff Mechanical Engineer, says: “This is one system that can perform our day to day vibration control work and also meet our needs for a closed-loop acoustic controller operating our reverberant chamber. The common interface reduces my workload and the built-in safety features insures efficient and safe reverberant chamber operation.”
This unique solution was developed from the industry leading VibControl solution introduced by m+p international in the 1980’s. The powerful customer driven features in the “easiest to use user interface” results in a solution that can scale to meet any requirement, growing with your testing needs. Real-time 1/3 octave closed-loop control for reverberant chambers was developed to meet a special customer need for speed and safety dealing with very expensive test articles in facilities where seconds count and mistakes are not acceptable. Replacing open loop manual control solutions led to more accurate testing, ability to store equalizations and quickly come back to the same condition allowing for equipment and chamber characteristics resulted in repeatable reliable testing. Many safety checks are built in and help the operator protect the test article while helping get the job done more quickly.
3. New SO Analyzer Software Released
The latest release of m+p international’s SO Analyzer software has important new functionality for Modal Analysis, Networked based licensing and Test Automation applications.
For modal analysis the modal assurance criteria (MAC) wizard has been extended to compare modal data from any two sources producing cross-correlation factors between all modes. This feature enables different modal analysis results to be compared for consistency or measured data (EMA) to be compared with finite element models (FEM) for related mode identification, FEM validation and tuning. This assists in improving analysis settings for more accurate mode extraction and also improves confidence in the final results.
For multi-user installations the new SOFlexNet module provides the capability of running a number of concurrent systems on a network but then also the facility to detach a temporary license for a portable system. In this way off-site measurement licenses can be shared between engineers and added back to the office system for analysis and reporting activities. For system administrators full usage logging is provided with real-time information on current users and the option of remote log-out of clients if required.
Many monitoring and product test applications require comparative data and pass/fail or go/no-go indication. The new Reference and Limits tool allows profiles to be defined for overlay with any real-time display function together with on-screen indicators for these reference, high and low levels (see point 4 for use of this tool). Any number of different comparisons can be defined for single or multiple channel requirements. To further enhance automation digital I/O signals can be programmed from within the SAX Basic macros for integration with external ATE. Applications such as shaker test monitoring, end of line product testing and machine diagnosis are now easily performed.
4. How to Display Fixed Overlay Traces with Online Data Using the SO Analyzer?
If you use our SO Analyzer for dynamic signal analysis, the following technical tip will surely be of interest for you. It describes step by step how to use the fixed reference and limits overlay tool in 2D charts.
5. m+p international at ESTECH and SAE Exhibitions
Do you want to learn more about our sophisticated vibration control systems, our high-precision dynamic signal analyzers or LXI/VXIbus-based data acquisition solutions? Then visit us at the ESTECH and SAE conferences and exhibitions in May:
We would be pleased to see you there.
6. Thought for the Day
"Blessed is the man who, having nothing to say, abstains from giving us wordy evidence of the fact." – George Eliot
Well, that brings to a close this edition of the m+p international Newsletter. If there are items of info you would like to see here or if you have useful tips for the rest of the environmental test world, then please send us your pointers and we'll include them in the next edition.
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