The maximum amplitude of the applied force attained by the shaker table or armature during a test. In a sine wave test mode, the force and velocity of the table and test sample will varying sinusoidally over time.
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The vibration frequency range that the shaker is capable of providing in an unloaded state.
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The maximum acceleration during testing without a test load. The actual maximum acceleration will vary depending on the value of the combined mass of moving element and the test load.
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The maximum velocity amplitude attained by the shaker table or armature during an unloaded test. In a sine wave test mode, the force and velocity of the table and test sample will varying sinusoidally over time.
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Mechanical shakers use a rotating shaft with eccentrically positioned or unbalanced weights to generate vibration. The shaft is usually driven by an electric motor. The level of vibration can be adjusted by changing the position or size of the weights. Although mechanical shakers have largely been displaced by electrodynamic shakers, they are still useful and reliable tools in certain applications.
Electrohydraulic or servohydraulic vibration or force generator systems. Hydraulic systems are useful when large force amplitudes are required such as in testing large aerospace or marine structures or when the magnetic fields of electrodynamic generators can not be tolerated.
Vibration or force generator using the application of electrical charge and voltage to a sensitive piezoelectric crystal or ceramic element to generate deformation and motion. Many accelerometers use the reverse effect to measure vibration.
A vibration or force generator using pressure air to drive a table. They are known as "air hammer tables," pneumatic vibration systems or single pneumatic rod systems.
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An integral slip allows horizontal or both horizontal and vertical testing of samples. The slip table is a large flat plate that rests on an oil film placed on a granite slab or other stable base. The slip table is attached to the shaker to provide horizontal testing capability.
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Mechanical impedance is the ratio of force to velocity, where the velocity is a result of that force only. The inverse of mechanical impedance is mobility.
An excitation source imparts vibrations into a system for modal analysis. The system is stimulated or vibrated by the excitation source and then external accelerometers measurement the resulting vibration signature. Modal analysis is the process of breaking complex structural motion into individual vibration modes. Usually a Fast Fournier Transform (FFT) computer program is used to shift data from the time domain to the frequency domain. Once the data is in the frequency domain analysis, analysis can breaks complex vibration signature down to component frequencies and relate the modes to specific features in the systems. A piano wire coupler may be used to transmit the vibration to the test sample.
Particle Impact Noise Detection (PIND) testing equipment detects any loose foreign particles that may be present in a hermetic package. The package is placed on a shaker table where it is in intimate contact with an acoustic transducer that drives an ultrasonic amplifier.
Qualification of production components such as the testing of electronic or mechanical components for aircraft, spacecraft, military or other mission critical applications.
The testing or screening for resistance to vibration of microelectronic or semiconductor components such as memory, microprocessors or other integrated circuit chips. Also, testing or screening of printed circuit boards or other electronic sub-assemblies.
Mechanical testing to determine the resistance of a material or product to repetitive applications of stress. Materials will fail at a much lower stress level under repetitive loads compared to a single, static tensile test condition.
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