What is the name of the graph produced by testing equipment in vibration analysis?

The correct answer, which identifies the graph produced by testing equipment in vibration analysis, is the time waveform. This graph represents how the measured vibration signal changes over time, providing a visual representation of the amplitude of vibrations as they occur. The time waveform captures the transient characteristics of a vibration signal, making it essential for identifying patterns that may indicate issues such as misalignment, imbalance, or bearing faults.

While the signal spectrum, Fourier transform, and frequency response are all important concepts in vibration analysis, they serve different purposes. The signal spectrum refers to the distribution of energy across various frequency components within a signal, which is derived from the time waveform but is not a direct product of the testing equipment. The Fourier transform is a mathematical technique used to convert the time-domain signal into the frequency domain, enabling the generation of the signal spectrum. The frequency response illustrates how a system reacts to various frequencies, providing insight into resonances but is also based on analysis derived from the time waveform data.

Thus, in the context of vibration analysis, the time waveform is specifically the graph that directly represents the time-domain data collected from the vibration test, making it the accurate choice for this question.