網(wǎng)絡(luò)嗅探器的設(shè)計與實現(xiàn)中英文翻譯外文翻譯-其他專業(yè)-全文預(yù)覽
【正文】 asurement, if all these tests are satisfied at once, the measured result may be considered acceptable with a specific confidence coefficient. Otherwise, the measurement is rejected. After a general description of the MScMS, the paper focuses on the description of these three online diagnostic tools. Some preliminary results achieved by the system prototype are also presented and discussed. 1. Introduction In many industrial fields (for example, automotive and aerospace) dimensional measurements of largesize objects should be easily and rapidly taken [1–5]. Nowadays, the problem can be handled using many metrological systems, based on different technologies (optical, mechanical, electromagic, etc.). These systems are more or less adequate, depending on measuring conditions, user’s experience and skill, cost, accuracy, portability, etc. In general formeasuring medium–largesize objects, portable systems can be preferred to fixed ones. Transferring the measuring system to the measured object place is often more practical than the viceversa [1]. This paper analyzes the Mobile Spatial coordinate Measuring System (MScMS), which has been developed at the industrial metrology and quality engineering laboratory of DISPEA – Politeicodi Torino [6]. MScMS is a wirelesssensorwork based system, designed to perform dimensional measurements ofmedium–largesize objects(for example, longerons of railway vehicles, airplane wings, fuselages,etc.). These objects can hardly be measured by traditional coordinatemeasurement systems, such as, for example, Coordinate Measurement Machines (CMMs) because of their limited working volume [7,1]. MScMS working principle is very similar to that of wellknown NAVSTAR GPS (NAVigation Satellite Timing And Ranging Global Positioning System) [8]. The main difference is that MScMS is based on ultrasound (US) technology to evaluate spatial distances, instead of radiofrequency (RF).MScMSis easily adaptable to different measuring environments and does not require plex procedures for installation, startup or calibration [6]. The aim of this paper is to describe the online diagnostics tools implemented in the system in order to continuously monitor measurement reliability. 2. The concept of “reliability of a measurement” If we refer to the field of CMMs, the concept of “online metrological performance verification” is strictly related to the notion of “online selfdiagnostics” [5,9]. In a same sense, this approach is “plementary” to that of uncertainty evalu
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