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 Wysłany: Czw 7:44, 09 Gru 2010 Temat postu: tory burch shoes FFT method using dynamic sensor c |
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FFT method using dynamic sensor calibration uncertainty analysis
Define the degree of their spiritual shop at 15Hz, 30Hz or i00Hz frequency gives the transverse sensitivity with increasing frequency may be increased, so the higher the frequency, greater impact. If the transverse resonance measurement of response near the resonance frequency rapidly become larger although the frequency response curve of the standard accelerometer working frequency range is flat, but the standard used in the high frequency accelerometer will be installed when the resonant frequency, Therefore, the calibration standard uncertainty of the accelerometer can also become large. For example, the standard accelerometer {EI60Hz, 9g cries confidence level calibration uncertainty of 0.6 ethyl, in 2 ~ 5kHz cries when 0.9, 5 ~ 7kHz 1.1 when the cries of, 7 ~ 10kHz pm 1. 6 hiss. Since the error of cable noise generated within 5 ~ 1OHz up to 0.3 ethyl, within the lO ~ d0Hz to 0.2 hiss. These fall into the random error. The absolute standard accelerometer calibration and for the temperature difference between the FFT method of the error caused by Li is less than 0.1%. Calibration system will produce errors in other instruments,[link widoczny dla zalogowanych], side such as the use of a vibration sensor calibration Xiao multiplexing switch, frequency range 5Hz ~ 10kHz gain error of ± 0.1 of its smart range. ± 0.2% lower than 5HZ in range. Precision attenuator in the entire frequency range to 60dB attenuation, if the error is 0.2% to 100dB, the error is O. 3 no. If the calibration temperature changes will produce errors. For example, temperature 3 \Six, eight generating system error synthesis considering the various errors due to cable, can use the following formula to calculate the error of its units into Ⅳ Σel = l. (994) when measured for a number of Ⅳ. . , Confidence level CL = 994, the value of 2.58. Above formula assumes that the probability distribution derived for the uniform distribution. Random error can be derived using similar methods, the root mean square error can be calculated by a -= J Ⅳ / Σ really} i = 1 |, 『Ⅳ ~ 1 the total uncertainty of the random error of the total synthesis error uncertainty the following formula can be a degree of u and U can be substituted into the rain to end the formula that you can get the total uncertainty of 'u = {[2-5s lazy )]|,+[( Philip) the calculation of these errors were 『 computer program can be compiled into a computer to calculate and output the results VII Conclusion dual-channel FFT analyzer, accelerometer calibration, this method can be little soil on the distribution of consumption and control error of the measurement process can be controlled by computer and can get a higher calibration accuracy. Reference CI】 1. S. And select}; Fu AG Pier Suo forward. QI methods to earn off of random data,[link widoczny dla zalogowanych], defense workers leek Press,[link widoczny dla zalogowanych], l976. I2 (2] H. Herl 'afsen forward,[link widoczny dla zalogowanych], dual-channel fast-Bo Ⅱ} transform analysis, technology assessment Boop love to hide Creutzfeldt-Jakob: On,[link widoczny dla zalogowanych], 19BB. (3] Xiaoming Yao forward. Mistake the whole theory and application, namely, publishing home Society, I985.C4] TorbenR.Licht, Henr disk Ander ~ enTrends'nAc ~ lemmeterCalibration.Techn ~ ealR ? vewNo2-1987. '(on page 7) four base rate of the original shell, and firmly take the socialist road, improve their own work, but also their treatment threshold reasonable solution, the title is equivalent to title, not the measurement of quality control personnel be treated as non-production personnel to further column should not be set lower than the treatment of persons. comrades - in the first three Since the barrier will, in the reform and opening up policy of the CPC Central Committee means the bow l, we do have the measurement of larger development. I994 released on State Bian j strike in our country given the command units, the NPC Standing Committee of the station by 1985 , well praised by the President, promulgated the \work in our defense and total defense set the Commission of Science and Technology Supervision Bureau under the leadership, but also a great development. Aerospace Defense measurement is an integral part of measurement is an integral part of national metrology, in the past has been working for National Defense Commission and the State Bureau of Technical Supervision of the care and support. We believe that \spirit, promote self-reliance, hard look at the advantages of traditional puppets industry, so that measurement work on the development of aviation and aerospace industries, and make greater contribution. a 25 a disgrace
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