The component responsible for introducing energy into a structure or system to induce vibration is a critical aspect of vibration testing. This assembly typically involves a shaker or actuator, a signal generator, and an amplifier. The shaker applies a controlled force or displacement to the test item, the signal generator produces the desired waveform representing the vibration environment, and the amplifier boosts the signal to a level sufficient to drive the shaker. For instance, a sinusoidal vibration test might employ an electrodynamic shaker driven by a sine wave signal from a function generator, amplified to produce the required acceleration levels on the test article.
The effectiveness and accuracy of vibration testing heavily depend on the capabilities of this energy-inputting portion of the setup. Accurate reproduction of real-world vibration conditions, such as those experienced during transportation or operation, allows for thorough evaluation of the test item’s durability and performance. Early identification of potential weaknesses or failure points through controlled vibration exposure can prevent costly in-service failures and improve product reliability. Historically, mechanical shakers were common, but advancements in electronics have led to the widespread adoption of electrodynamic and hydraulic shakers, offering greater control and flexibility.
