Research on Vibration Test Conditions in Particle Impact Noise Detection

Particle Impact Noise Detection (PIND) test is a kind of reliability screening technique which is used to detect free particles in hermetical components and is specified in MIL-STD-883E method 2020.7. Some vibration test conditions are defined which aren't always appropriate in practice. The particle's mean velocity equation is derived based on dynamics and simulations analysis. It disclosures the proportional relation between the particle's mean velocity and vibrator's one. It also shows that the particle's mean velocity is in direct ratio to vibration acceleration and is in the inverse ratio of vibration frequency. It shows how do vibration acceleration, vibration frequency, recovery coefficient and the particle's mass influence its output energy consequently. Furthermore, the best vibration frequency is derived under the constant rated power of vibrator. It shows that the best vibration frequency is in direct ratio to vibration acceleration. Some experiments and simulations are given last