What is sine testing?
Sine Vibration (SV) Testing involves subjecting the test article to a swept sine input over a frequency range (typically 5-100 Hz) to replicate the low-frequency launch environment. This test method is used for various purposes on a structural model but mainly on flight articles.
Why do we use sine vibration test?
Sine testing is primarily useful in identifying resonant conditions within a test item. A vibration test that applies a fixed sine dwell at a resonant frequency will usually generate the highest amplitude displacements and accelerations and therefore the most damaging fatigue stress conditions for the product.
What is a sine sweep?
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 sine sweep signal?
Time-varying signals with multiple frequency components are an important category of signals for engineers. A sinusoidal sweep is a sinusoid whose frequency varies with time. (Thus, the peaks in the sinusoid will get closer together or further apart as time goes on.) An example of a sinusoidal sweep is shown in Fig.
What is sweep rate in vibration?
Sweep and Sweep Cycles: A sweep is defined as a traverse from one frequency to another. Sweep Rate: The rate at which the frequency range is traversed. The units for sweep rate are usually Octave/minute or Hz/minute. Octave per minute is a logarithmic sweep rate while Hz/minute is a linear sweep rate.
What is sine sweep vibration test?
What is the difference between sine and random vibration?
Random Vibration is a varying waveform. It’s intensity is defined using a Power Spectral Density (PSD) spectrum. Whereas sinusoidal vibration occurs at distinct frequencies, random vibration contains all frequencies simultaneously. Also phase changes occur over time with random vibration.
What is a sine burst test?
The sine-burst test is a simple method to apply a quasi-static load using a vibration shaker and shock testing software. The process involves subjecting each orthogonal axis of the test item to five-to ten cycles of a sine wave whose peak is equivalent to the qualification load level.
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
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.
How does a sine vibration test work?
Sine Vibration (SV) Testing involves subjecting the test article to a swept sine input over a frequency range (typically 5-100 Hz) to replicate the low-frequency launch environment.