Product category:
Materials Testing
News Release from: M+P International | Subject: Noise And Vibration Analysis
Edited by the Manufacturingtalk Editorial
Team on 16 June 2003
Shaking Up Future For Noise And
Vibration Analysis
In the area of Noise and Vibration analysis, the last 20 years has seen extensive technology development.
In the area of Noise and Vibration analysis, the last 20 years has seen extensive technology development However, the software has often been left behind in older UNIX environments
This article was originally published on Manufacturingtalk on 4 Sep 2002 at 8.00am (UK)
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m+p international's SmartOffice dynamic signal analysers are used for multi-channel vibration and acoustic analysis, impact testing, structural, rotating machinery and acoustic analysis and more.
m+p international's SmartOffice aims were new: To develop a native Microsoft Windows solution and to take advantage of current O/S and networking standards to help users reduce development time and costs.
To implement a user interface with a Windows philosophy, reducing training requirements.
To use the PC hardware and office tools engineers have readily available to create a highly productive desktop environment.
Further reading
VibControl Product Family with even more features
m+p international's latest VibControl shaker control system software continues to keep m+p's customers at the leading edge of environmental test simulation and vibration analysis.
Unlimited Time Data Rep/RoadLoad Simulation
The m+p international VibControl Time Replication suite of programs provides the complete solution for the transfer of vibration data from the true environment to the test laboratory.
Analysis and Reporting for Signal Analyzer
The Agilent 35670A 2- or 4-channel portable FFT dynamic signal analyzer is now supported by m+p international's SmartOffice software.
To provide a Team Working environment for consolidation, sharing and handling of data from the field and lab to the office.
To these basic architectural ingredients, the Noise and Vibration technology was added by a team with extensive experience in the field, with the help of recognised leading universities and written exclusively by Microsoft Certified programmers.
For user flexibility, the decision regarding acquisition hardware was kept open to allow interfaces with National Instruments, VXI Technology, OROS, TEAC, Sony and others.
The key SmartOffice design objectives: Within one application Import data, do real-time data acquisition, analyse results and create reports, in the field, in the lab and in the office.
Compatibility Allow engineers to import data from more than 20 different standard N and V formats.
Active Documents A fully ActiveX compliant architecture enables simple Copy and Paste of graphs or animated shapes into compliant applications such as Microsoft Word or PowerPoint.
Wizards SmartOffice uses intelligent wizards, which step by step, guide engineers through the complicated process of data acquisition, analysis and reporting.
Metadata The metadata reflects the concept of a full and open user-definable documentation with an unlimited set of user information and full integration of 3rd party data.
Visual Basic-Compatible User programming Automation of repetitive tasks using a built-in Visual Basic-compatible programming language.
Users' LABView, Matlab and other special modules can also be integrated.
A Study of a typical SmartOffice Modal Analysis application using the National Instruments 4472.
With the NI4472 card, SmartOffice can be used on a laptop with an additional hardware box just 200x135x45mm, installed into a Desktop PC or mounted in a PXI rack fully integrated.
The NI4472 provides - 24bit ADC giving 120dB dynamic range - Up to 45kHz alias-free bandwidth - Voltage and ICP input conditioning - Configurable from 8 to 114 analog input channels in one chassis with multi- chassis synchronisation.
Modal Analysis has three primary steps: 1.
Geometry set up 2.
Measurements of Frequency Response Functions (FRF = Response/Force) for all chosen nodes on the structure.
3.
Advanced Modal Analysis methods are then used to estimate, from the measured FRF's, the resonant frequencies and mode shapes for visualisation.
Set-up is simple using the SmartOffice Geometry wizard, multiple components of any type, point and click connection of nodes and direct node identification to each measurement step are included.
Measurements are taken using a modal hammer equipped with a force transducer at the tip.
Thus, during a hammer impact, the exact excitation force can be measured.
Based upon the hardness of the tip, different frequency ranges can be excited.
Accelerometers are used to measure the structural responses.
SmartOffice controls the NI-4472 in every way, allowing software set up of user information, transducer calibration, acquisition and processing parameters.
During the measurement step, auto-power, cross-power, FRF and coherence functions are calculated, automatic detection of double impacts and overloads is done, automatic node number increment and automatic data storage are performed.
This level of automation increases engineer productivity and reduces costs.
The final Modal analysis is carried out using the combined Time/Frequency Polyreference methods from the University of Cincinnati, OH USA.
These algorithms have proven to be the most stable and flexible across a wide range of structures.
Using the Advanced Modal Parameters Estimation wizard, the resonant frequencies and damping values are calculated based upon the Impulse response functions, a stabilisation diagram is calculated and the stable parameters selected.
In a second step all modal vectors are calculated using a Frequency domain approach.
Once the animated geometry is created this can be exported to the final report document and sent to the customer who is able to manipulate the view using the SmartOffice animation toolkit within the Word document.
Conclusion: SmartOffice combines a new software approach with the very latest acquisition hardware to provide a completely integrated Windows-Office-PC environment that can be used in a matter of minutes to acquire, analyse and report the most complex of data requirements.
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