tailieunhanh - Harris' Shock and Vibration Handbook Part 6

Tham khảo tài liệu 'harris' shock and vibration handbook part 6', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | VIBRATION TRANSDUCERS TIME FIGURE Acceleration response to a half-sine pulse of acceleration of duration T dashed curve of a mass-spring transducer whose natural period Tn is equal to A times the duration of the pulse and B times the duration of the pulse. The fraction of critical damping z is indicated for each response curve. Levy and FIGURE Acceleration response to a triangular pulse of acceleration of duration T dashed curve of a mass-spring transducer whose natural period is equal to A times the duration of the pulse and B times the duration of the pulse. The fraction of critical damping z is indicated for each response curve. Levy and CHAPTER TWELVE FIGURE Acceleration response to a rectangular pulse of acceleration of duration T dashed curve of a mass-spring transducer whose natural period Tn is equal to A times the duration of the pulse and B times the duration of the pulse. The fraction of critical damping z is indicated for each response curve. Levy and between the pulse and the response this occurs when Tn is approximately equal to T. However when Tn is small relative to T Figs. to the deviation between the pulse and the response is much smaller. If a shock is generated by metal-to-metal impact or by a pyrotechnic device such as that described in Chap. 26 Part II and the response accelerometer is located in close proximity to the excitation source s the initial pulses of acceleration may have an extremely fast rise time and high amplitude. In such cases any type of mass-spring accelerometer may not accurately follow the leading wave front and characterize the shock inputs faithfully. For example measurements made in the near field of a high-g shock show that undamped piezoresistive accelerometers having resonance above 1 MHz were excited at resonance thereby invalidating the measured responses. To avoid this effect accelerometers should be placed as far away

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