What is the frequency sweep method?
Sweep frequency response analysis (SFRA) is a method to evaluate the mechanical integrity of core, windings and clamping structures within power transformers by measuring their electrical transfer functions over a wide frequency range.
What is a logarithmic sweep?
A continuous varying of the frequency in a manner such that within any portion of the frequency range, a fixed number of decades is traversed in a fixed length of time.
What is a sine sweep test?
A sine sweep test is used to find the resonant frequencies of a product. Resonance occurs when a product is exposed to an external vibration that matches a product’s natural frequency. A resonance test such as the sine sweep is used to identify and observe a product’s response to a resonant frequency.
What is sweep range?
The frequency range (sweep range) is defined with the Stimulus settings. The sweep points are calculated from the Span and the specified Number of Points (n > 1) with the condition that the step width is constant on the logarithmic scale.
What is sweep cycle?
Sweep and Sweep Cycles: A sweep is defined as a traverse from one frequency to another. A sweep cycle varies from one frequency to another and then back to the staring frequency. For instance in Figure 2, a sweep could be a traverse from either 5 to 500 Hz or from 500 to 5 Hz.
What can a sine sweep test be used for?
A sine sweep test can be employed with the VibrationVIEW Sine software module ( free demo ). A frequency sweep is often used to quickly observe a product’s response in the frequency range of the end-use environment. During a sine sweep test, a vibration shaker pans, or “sweeps,” through a range of frequencies.
How is a logarithmic sweep rate used in Sine vibration testing?
A logarithmic sweep rate is typically used to excite a constant time interval per bandwidth for the test (e.g., 2 or 4 octave/min), which is intended to simulate sustained sine and transient events that occur during launch. Risks can be mitigated through best practices. Best Practices for Use of Sine Vibration Testing
How does the sweep frequency response test work?
Sweep Frequency Response Analysis Test or in short SFRA Test can detect efficiently, displacement of transformer core, deformation and displacement of winding, faulty core grounds, collapse of partial winding, broken or loosen clamp connections, short circuited turns, open winding conditions etc. Principle of SFRA Test
Which is better a sine sweep or pink noise?
Applications. Compared to pink noise or white noise, sine sweeps produce frequencies with a much higher energy, as they dedicate the fully available dynamic to play one frequency at a time, not simultaneous frequencies like noise. This gives sine sweeps a better immunity against room ambience and background noises.