Wide Range Integral Shaker - Qwis
The Qsouces Qwis is a extremely compact and powerful shaker with all functions to allow efficient and accurate artificial excitation measurements. The new floating guidance system has allowed another step in power density and an increase in frequency range up to 3000 Hz. As all other Qsources shakers the Qwis is self-suspending, self-aligning, has record low mass-loading, and can be applied in any inclination with negligible influence on natural response of the test-object.
This frequency range would normally require multiple measurements with different hammer masses and impacts heads on instrumented hammers to obtain acceptable measurements, with moderate repeatability. Or with a common external supported shaker, multiple measurements with different stingers and repeated problems with alignment would have been necessary.
The minimal space requirement and the ability to automatically align in any inclination allow for applications and accuracy which is unattainable by traditional other excitation devices.
The force level is enough to excite small and large machinery, and for example complete vehicles of all sizes, aero-engines, fuselage, satellite structures etc. The typical complete test-object mass can range between 2 and 4000 Kg.
Within the intended frequency range you can expect accurate and identical measurements from different measurement technicians. Providing a solution for measuring structural and vibro-acoustic frequency response functions (FRF) for modal analysis, correlation, sub-structuring, modification testing, load identification, etc.
The mounting and suspension system allow the use in narrow spaces in any inclination.
Features
Widest frequency range self suspending shaker
Highest force density solution
Self aligned and fully functional in any inclination
Integrated high resolution force sensor without adding coupled mass
In-line high resolution accelerometer module
Covered by multiple patents
Efficient multi-location excitation with adhesive rings
Extensive electrical, mechanical, thermal protections for reliable application
Measurement techniques
Transfer Path Analysis and sub-structuring
Inverse source or load identification
Experimental Modal Analysis
Statistical Energy Analysis and equivalent
Numerical model correlation and improvement
Main characteristics
Typical test-object mass 2 to 4000 Kg
Extended frequency range 10-3000 Hz**
Core frequency range 25-2400 Hz*
Sine at 27 Hz, force level 56 N peak to peak
Broadband random 10 N RMS force level
Coupled mass 5 gr
Shaker diameter 29 mm
Availability
The Qwis shaker is marketed by Qsources and Head Acoustics.
*What is core frequency range?
If a very high accuracy is essential it is advised to remain within the core frequency range for the typical test-object mass range. This is the range frequency range where the shaker was designed for and also has its highest force level.
**What is extended frequency range?
High accuracy in the extended frequency range is possible on the heavier objects. In some applications on lighter objects, like troubleshooting, fast application on many locations is needed. Or in some applications, like load identification and transfer path analysis, access is only possible with a small shaker. In those cases a lower accuracy or higher risk of error is accepted and the extended frequency range is used.
In all cases a reciprocity verification and two shaker coupling/decoupling verification can be applied to prevent misinterpretation of measurement results.
