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Measurement error analysis and its application arc


Large roots, has nothing to do with the radius of the arc; (2) For single measurement, measuring the position of great influence on the measurement error, and on the EE. The impact is different; (3) simply adding small pieces of arc measurement (uniform) sampling points. May make a single error of measurement increased significantly, with least square method can not be satisfied with the results. For (3). We compared through digital simulation and comparison of the actual measurements were verified by the following results: (a) using the same algorithms (such as the Gaussian algorithm) by measuring the value of the center,[link widoczny dla zalogowanych], uniform sampling point generally greater than the points of error Section intensive mining point margin of error; sub-intensive sampling sites, different from the uniform sampling sites, is shown in Figure 1 (a), the measurement sampling point (eg 30 points) are located in the A, B, c near (b) adopt uniform points (the same number of points) greater measurement error, often many times the amount of such deep results of gross errors. (C) differences in the measurement accuracy of the above is relatively high. Performance is more evident. For these results, a preliminary analysis, the common algorithm - least squares method is built on the basis of normal distribution, but the uniform sampling is not conducive to ensure compliance with this premise. Third, the conclusions of the arc measured by the above error analysis, can have the following conclusion: For an arc,[link widoczny dla zalogowanych], the smaller the measured angular range. Transfer coefficient the more the error too. Uniform sampling and data processing by the least square method, the arc is measured on small pieces of limitations. On this basis, proposed and demonstrated a new measurement method measurement technology 1999. № 7 - sub-sampling method for the intensive method is simple, the random error of measurement has a good damping. In addition, these conclusions have the following applications, (a) contribute to the design parameters of the arc made more reasonable technical requirements, the correct selection of the radius of the arc of the contour tolerance and tolerance; (b) contribute to the arc detection reasonable choice of method; (c) contribute to accurate assessment of the arc of the test results. However, with large random distribution of small circular contour deviation, high-precision measurement difficulties are probably large, number of measurements required will be much more. By extension, these findings on the spherical surface of revolution is the same space for the water flow data for a dynamic monitoring system f7 Zhu Weidong Xu Da (Xinjiang Iron and Steel Group Corporation {Lu Mu Qi 830,022 giant two) Ephemera strigata Shao-Ji Zhou, Xinjiang Bayi ink paper Iron and Steel Co. (Jane Mi eight steel) dynamic monitoring system of water flow data in the composition of the signal transmission and communication equipment selection key principles and main function. Term monitoring of water flow in the United States ■ workstations monitoring host monitoring terminal modem 'to establish a more complete dynamic monitoring system of water flow data, water points to important data quickly and accurately collect up of eight steel supply situation to find out, grasp the running water network conditions, to achieve water scientific and systematic management, and sustainable economic development will bring far-reaching impact. First, the dynamic monitoring system of water flow data 1. Steel structure of the system of water supply network system based on eight points, wide range of characteristics,[link widoczny dla zalogowanych], in order to improve the system reliability and future system expansion needs, generally the system is divided into six patches, test point 77,[link widoczny dla zalogowanych], the basic cover the whole area and part of the eight raw steel production, including area, as shown. Socks r angry at 1 (1) system in each district to set up a field station chip, the workstation IPC by a number of power supply, isolation device and a modem component. The collection meter site (or collection terminal) of the signal sent through the signal isolation IPC A / D interface board (2) to set up a monitor on one host (the host) and the four monitoring terminal. Monitoring host monitoring the work of the field station, receiving and processing station sent the data each collection point and forwarded to the monitoring of four terminals, and can send instructions to each workstation. IPC and PC-site monitoring host,[link widoczny dla zalogowanych], through a modem to communicate. 2 signal transfusion and Communications (1) collected from one instrument to the computer's signal transmission is through the erection of the scene from the collection point to the workstation line (4 × 1.5 shielded cable) directly to the analog signal transmission (distance is restricted to within lkm to ensure the reliability of analog signals transmitted directly.) One meter by 4 ~ 20mA current loop, the signal is transmitted to the signal isolation one by one with electrical appliances. On the one hand it can be an instrument of power, while achieving on 4 ~ 20mA signal transmission, in addition to the 4 ~ 20mA current signal into the computer A / D converter board needs 1 ~ 5v standard signal, and to achieve a meter loop isolation between the transformer and the computer to ensure the security of the computer is running. (2) on-site workstations and monitoring end-to-host communication ■ ■ -,

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