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P141
Time Dependency of Pressure – The borders between static pressure, quasistatic pressure and dynamic pressure are subject to blur since the transitions from one form to another are not sufficiently defined. For dynamic pressure measurement a schematic depiction with a proposal for the areas can be seen in Figure 12.4 below. Another comparison for total pressure, static pressure, and dynamic pressure can be seen in Figure 12.3.
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P144
Dynamic Pressure – Dynamic pressure is defined as a changing pressure where the rate of change over time is not zero. Dynamic pressure represents the pressure fluctuations around a certain pressure level (static pressure). It is the time variable component of the total pressure.
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P146
Static Pressure – Non-varying pressure. It is therefore constant over time and is the base level of the total pressure.
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P147
NOTE: For dynamic pressure measurements pressure with a rate of change below 2 Hz is referred to as static pressure.
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P151
Quasi-Static Pressure – Pressure with a very low rate of change over time that is close to zero but not zero.
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P152
Absolute Pressure – A pressure given in absolute pressure refers to the pressure level compared to an ideal vacuum.
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P153
Differential Pressure – Differential pressure is the measured pressure difference between two separated volumes. A special form of differential pressure is relative pressure, where one volume is the surrounding atmosphere.
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P155
Relative Pressure – Pressure given as relative pressure refers to the pressure difference between the atmospheric pressure at the time of measurement and the pressure level within the measuring volume. Relative pressure is also referred to as gauge pressure.
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P156
Burn In – Failure detection process for a component or system at the start of the lifetime. Often extreme operating conditions are utilized to find defects or flaws of a newly manufactured component or system.
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P157
Dithering 1 – The application of intermittent or oscillatory forces just sufficient to minimize static friction within the transducer.
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P158
Electrical Excitation Frequency – The instantaneous frequency of the excitation waveform.
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P159
Electrical Excitation Waveform – The time versus amplitude characteristics of the excitation signal. (e.g. Time varying or DC waveform).
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