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3Aerospace & Defense Division Toll-Free in USA 866-816-8892 716-684-0001 www.pcb.com

Aerospace Ground Test

Ground Vibration TestingPCBs focus on tailoring sensors and signal conditioning to specificapplications is illustrated by our line of structural test accelerometers andsignal conditioners. These products are designed for convenience, accuracyand reliability, whether the test involves extracting the natural frequencies,vibratory modes shapes and damping of a complete vehicle or an operatingsubsystem or requires only quick and dirty component vibrationtroubleshooting.

Since this kind of testing typically involves large channel counts, PCBsGVT specific products include:

A line of cost effective phase-matched structural accelerometersthat feature accessories for simplified mounting. Theseaccelerometers are available in a range of form factors for bothsingle axis and triaxial measurements. High sensitivitypiezoelectric force transducers are also available for vibrationforce control of compliant structures such as satellites.

Autonomous sensor property identification, using industrystandard Transducer Electronic Data Sheet (TEDS). This capabilitycan be further tailored to interface with specialized formatsdeveloped by major data acquisition providers. PCB also offersa bar code reader tailored to the GVT application.

Cable management and signal conditioning systems includingpatch panels, multichannel cable, and bank switch systems.These save substantial installation and data management timeand money, while allowing large channel GVTs to beaccomplished with a limited number of data acquisition channels.

Modal shakers and shaker stands supported by a full line ofimpedance head systems that measure both the input force anddriving point response.

A full line of instrumented modal hammers specifically designedfor modal test excitation and force measurement, as analternative to shaker excitation.

Static and Fatigue TestingAlthough PCB is best known for our dynamic measurement sensors andsignal conditioning, we also offer a complete line of fatigue-rated straingage-based load cells for static and fatigue testing. These are available ineither single bridge configurations or dual independent bridgeconfigurations. The latter configuration is used in situations in whichmeasurement redundancy is required. Similarly, DC response pressuretransducers are available for aircraft fuselage pressurization cycling testing.

PCBs line of piezoelectric force sensors complements our strain gage-based load cells for those applications that require measurement ofdynamic (high frequency) forces. These piezoelectric force sensors can beintegrated with strain gage-based load cells in a system that measurescomplex static loads plus high frequency dynamic loads. Again, PCBsApplication Engineering team is available at your convenience to discussthese measurement system challenges.

Reliability and Functional TestingA great deal of aerospace ground testing involves exposing systems torealistic loading and operating conditions on the bench. PCBs line ofcost-effective fatigue and non-fatigue rated load cells and torque sensorsare widely integrated into bench tests that measure operating loads andtorques in aerospace systems. These sensors include reaction and rotatingtorque sensors with their associated signal conditioners. Among PCB'sfamily of torque sensors, the TORKDISC enables high bandwidth torquemeasurements in space constrained environments.

As mentioned above, PCBs ability to supply both piezoelectric and straingage-based load cells allows us to uniquely address complex loadingsituations that involve combinations of high static plus dynamic forces andtorques. For instance, integrating dynamic and static force/torque sensorsprovides our development engineering customers the ability to measurestatic loads related to an actuation systems primary function simultaneous

with high frequency or fleeting dynamic pressure or force transients thatcannot be accurately characterized by strain gage-based sensors.

PCBs family of load and torque sensors is complemented by our completefamily of AC and DC response accelerometers, as well as our line ofdynamic and static pressure sensors. In some cases, even PCB's completeline of precision microphones are enlisted, to sense the condition ofsystems under test or to measure the acoustic environment of the airbornesystems.

Acoustic Testing and CertificationPCBs complete line of 1/4", 1/2" and 1" microphones are available in twoversions:

Externally Polarized Prepolarized

The prepolarized type of microphone offers significant savings in signalconditioning costs. While the performance of these microphones isessentially identical to their conventionally powered, externally polarizedcounterparts, the microphones and their preamplifiers are designed tointerface with constant current (e.g. PCBs, ICP) signal conditioners.

Because ICP signal condition