ugg boots billig Moment of inertia of large aspect

Moment of inertia of large aspect ratio horizontal component measurement and error analysis

Is the root mean square, namely: - 4 {+ i + ... + \Uncertainty in time to be sure to calculate the effective degrees of freedom, but when each z are normal distribution, t distribution can be approximated as the only one with Welch Sartre Siwei Te formula of the effective degrees of freedom . 1.7 expanded uncertainty specification JJF1033-2008 (Check for Standard of measurement, \calculated the distribution, but direct access time, the expanded uncertainty expressed by U. In this case generally the green 『k = 2. (2) Expanded uncertainty: when the value contains the factors required by the confidence probability and in accordance with the distribution calculated by measuring the time, the expanded uncertainty with. the confidence probability P typically take 95%, the expanded uncertainty expressed by Uq. If the measurement is close to normal distribution, but also gives the effective degrees of freedom. 2 Conclusion A type uncertainty component is a series of repeated observations (or known resolution) calculated, B type uncertainty component is assessed based on relevant information and awareness of their staff to be judged. of both does not exist between the essential difference, but a different evaluation method. Assessment of staff in the assessment process, according to their knowledge, the sources of uncertainty as far as possible on does not missing,[link widoczny dla zalogowanych], not repeat, so that assessment results reflect the genuine a suspicious degree of accuracy of measurement results, to achieve the purpose of evaluation. Author: Chen Ping, female, senior engineer. Work: Chengdu Institute of measurement supervision and verification testing. Mailing address: 610o21 Erxiang 5 northbound east of Chengdu. Received Time: 20o8 a O8-11 (on the next page 6 Cool

component measurements close to the true value. Therefore, in addition to improve the measurement equipment,[link widoczny dla zalogowanych], processing, installation accuracy outside. take the following measures to improve the measurement accuracy is also an effective way to: (1) Processing and measuring the weight and shape similar to the standards body components to reduce the difference between the two oscillating cycle can be a very good location and other factors eliminate the non-linear Majesty bring influence to improve the accuracy of measurements and reduce error. ( 2) reduce the device swinging part of its own inertia, moment of inertia to improve air frame cycle and put the tested structure and the swinging period of post-sample difference. 4-site measurement of body design and manufacture of the complete, scene of the commissioning of the user, respectively, and components of the sample were measured and used to meet the accuracy requirements. using this device on the standard value = 0.0078 (Kg.m2),, = 1.782 (Kg.m2) standard sample measurement, measured data such as Table 1: Table 1 Standard test sample inertia ■ ■ Results (Kg.m2) measurement data to meet accuracy requirements, compared with the same measuring equipment, easy adjustment, a good solution of such problems encountered in measuring components. References [1] Ding Xuesong, Lihui Peng, Wang Jun, Tang Wenyan. high-precision measuring equipment of inertia Development [J] Measurement Technology, 2007, (09). [2] Hou,[link widoczny dla zalogowanych], Zheng Bin, Yang Ruifeng and so on. Based on compound pendulum motion phase plane analysis of moment of inertia new method for measuring [J]. Journal of Basic and Engineering Science, 2003, (9). [3] Meng spring, classes Lai Ying, Zhu Jinshan. with the compound pendulum measurement of rigid body rotation inertia [J]. XI'AN INSTITUTE OF TECHNOLOGY, 2003,[link widoczny dla zalogowanych], (9). [4] Li Fan. complex shaped pendulum moment of inertia of the equivalent identification [J]. Mechanical Engineers, 1999, (2). [5] Zhuoping, left Jian, Chen Hui. complex shaped components of inertia of the measurement method and error analysis [J]. Mechanical Design, 2005, (10). [6], the first editor of National Cheng Kung University. Mechanical Design Manual Volume I [M]. Fourth Edition . Beijing: Chemical Industry Press. [7] Shen Ping. Theoretical Mechanics [M]. Kunming: Yunnan University Press, 1991. [8] RichardBoyntonMassPropertiesMeasurementHandbook [J]. SAWENo.2444, 1998. [9] Pu Liang expensive. mechanical design [M]. Beijing: Higher Education Press. [10] Ye-Tai Fei. Error Theory and Data Processing [M] .2000. 5th Edition. Beijing: China Machine Press. Author: Lei Yue, male, graduate . Work: Zhengzhou Machinery Research Institute of automation room. Mailing Address: Songshan Road, Zhengzhou, Henan 450052 81 Lu Zhihui, Sun Zhiyang,[link widoczny dla zalogowanych], Xiangyun, stars such as fees, Zhengzhou Machinery Research Institute (Zhengzhou 450052). Received Time: 2008 A A O2 O6

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