Wilcoxon offers a variety of vibration generators, support equipment, and sensors for test and measurement applications, including modal analysis, structural monitoring, laboratory testing, and seismic sensing.
Piezoelectric and electromagnetic shakers are used to provide reliable structural excitation of a test article within a controlled, localized environment. By simulating such dynamic forces and natural frequencies, shakers can be used along with accelerometers and other vibration monitoring devices to reveal cracks, defects, weaknesses or other abnormalities, allowing engineers and test technicians to better predict structural behavior over time.
These lightweight, portable shakers generate large dynamic forces at very high frequencies for reliable sonic and ultrasonic structural excitation.
Electromagnetic shakers excite primarily at low frequencies and can be used to measure components such as the first bending mode of airframes or ship hulls.
An impedance head is a transducer consisting of two sensing elements: a force gage, which references the force acting between the shaker input connection and the test item connection, while the accelerometer senses the acceleration on the shaker face. Wilcoxon’s electromagnetic shaker systems include a built-in impedance head.
Matching networks provide the interface between power amplifiers and piezoelectric shakers, providing voltage increases to allow the shaker to be driven at its full voltage level. At very high frequencies, lower output voltages are used to better match the reactive load.
The PA8HF and PA8HF-230 are designed to operate with all Wilcoxon piezoelectric and electromagnetic shakers, as well as both the N7FS and N8HFS matching networks.
Test and measurement accelerometers are generally characterized by smaller size than industrial units and typically use a 10-32 coaxial connector to connect to measurement equipment. They often have more expansive specifications than general purpose accelerometers, such as larger acceleration ranges or broader frequency responses, allowing them to be used in more rigorous testing environments.
Combine a supersensitive piezoelectric accelerometer, an ultra-low-noise amplifier, and excellent electrical/mechanical isolation and the result will be unmatched performance in measuring low-level vibration. Operating under the same principles as general-purpose accelerometers, Wilcoxon’s seismic sensors are characterized by low frequency response, high output sensitivity and a low noise floor. They are primarily designed to measure low-amplitude, low-frequency signals in applications such as structural monitoring, earthquake detection systems and vibration isolation verification. Capable of measuring down to sub micro-g range, our seismic sensors contain no moving parts, have minimal sensitivity to magnetic fields, and are relatively low mass. Power amplifiers with filtering, gain and integration capability are available to pair with the seismic sensors for all-around vibration monitoring detection capabilities.
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