IMEKO Event Proceedings Search

Page 888 of 912 Results 8871 - 8880 of 9113

Saulius Kausinis , Rimantas Barauskas
COMPUTER MODELLING OF A PIEZOELECTRIC ANGULAR RATE SENSOR

The paper presents the finite element (FE) modelling of operation of a rotational motion sensor that uses a balanced oscillator (tuning fork) to sense the angular rate. The 3D FE model has been employed to examining the sensor’s modal properties. The sensitivity functions have been obtained for adjusting the geometric parameters of the quartz element in order to achieve the desired values of natural frequencies. The performance of computations during the dynamic analysis has been enhanced by introducing a dynamically reduced model based on truncation of dynamic contributions of higher modes of the vibrating structure.
Results are presented in terms of sensor performance characteristics for various design parameters and modes of operation. The modelling assumptions adopted are tested experimentally on the vibrating quartz resonator.

Dietrich Hofmann, Gerhard Linß
INTERNET METROLOGY, THE NEW APPROACH TO MEASUREMENT. 45 YEARS SCIENTIFIC-TECHNOLOGICAL PROGRESS WITH IMEKO

Measurement is one source of knowledge acquisition in complex situations. The body of knowledge about sensors, instrumentation, measurement & testing is metrology. Metrology became tangle and unlimited for individuals. First in history of man Internet Metrology gives the chance to collect the metrological knowledge in a branch portal and to structure it for the real needs of customers. For this challenge IMEKO is well prepared. Aim of the paper is to give stimulations for collaboration in a customer-oriented Internet Metrology (Web Metrology).

Komyo Kariya, Shigeru Takayama
PROPORSAL TO INTRODUCE "MEASUREMENT SCIENCE" IN EDUCATION COURSE ON ALL FIELDS AND RANKS

At present, there are many kind of education course corresponded to the social situation. But the foundation of education should be advanced in an education system that is enacted according to the construction of each nation. The system is for example public school education system (or national school education system). General saying, the society is going to progress according to the development of technology. Nowadays modern society has achieved by the development of electric and electronic technology, communication technology, mechanical technology, industrial chemical technology, bio chemical technology, medical technology, civil and architecture technology, and other technologies. And generally it is possible to say that the modern society is going to advance demanding new technologies. Particularly, the future development of modern society will be influenced by the effect of Natural Scientific and Technological Education (after we say as NSTE) for the people live in society. This paper shows that the “Measurement Science” is proper to the education put natural scientific and technological knowledge in to the people according to the level and the rank of education system.

Mikko Hokkanen, Paul H. Andersson
AUTONOMOUS ADJUSTING OF MACHINE TOOLS IN FMS, IMPLEMENTATION AND RESULTS

The aim of the project (AutoComp II) was to examine the possibilities to build an autonomous measuring and compensation system for a flexible manufacturing system, FMS. This goal has been introduced in detail at the Imeko 2000 conference in the paper "Autonomous adjusting of machine tools in FMS". The focus of this paper is on the implementation and the results of the project.

Ferdinand van der Heijden, Gloria Tuquerres, Paul Regtien
A REFLECTION MODEL FOR ULTRASONIC TOF MEASUREMENTS FOR INDOOR APPLICATIONS

An acoustic position measurement system is based on a time-of-flight (ToF) measurement of an acoustic tone burst. In indoor situations, the accuracy of the measurement is often affected by echoes generated by nearby objects around the measurement set-up. The problem how to model these echoes is addressed in the paper. Such a model is useful for the development of ToF measurement methods that can deal effectively with the echoes. The proposed model is a zero mean, non-stationary stochastic process statistically defined by its autocovariance function. We are able to specify this function by means of a few parameters. Experiments performed validate the proposed model. We show that the proposed autocovariance function and the one deduced from experimental data can approximately be brought in accordance.

Valery A. Granovsky
PERSPECTIVE OF METROLOGY QUALITATIVE DEVELOPMENT

Metrology, as a system of scientific and practical activity, is developed under the influence of practice requirements. These requirements are directed at all-systematic broadening of its subject by necessity to measure non-physical quantities of objects and to study objects closely and hence to operate with new measuring apparatus. Metrology subject broadening will require assimilating the experience of using non-traditional types of scale for measurable quantities and mathematical tools, and methods of information means modelling.

Tatiana Siraya, Valery Granovsky
MEASUREMENT QUALITY CHARACTERISTICS IN METROLOGY: SYSTEMIC APPROACH

Problem of measurement quality analysis is stated as a systemic one. Measurement procedure is investigated as a complex system of various elements, including real objects and mathematical models. Several kinds of systemic decomposition are performed.
Quality of measurement is investigated in main aspects; both quality of the real objects and quality of the mathematical models are studied on the unified methodological basis.
Traditional accuracy analysis of measurement is complemented by the investigation of the main groups of quality characteristics for measurement procedure. In particular, reliability and complexity characteristics are studied.
Complete mathematical model of measurement procedure is formulated and studied. It relies on the models of the physical objects, as well as on the models of transformations, including the algorithms and software for data processing. Quality characteristics of the algorithms and software are estimated according to their role in measurement. The model quality characteristics are also investigated, including adequacy characteristics.

Vytautas Giniotis, Mindaugas Rybokas
DATA PROCESSING AND INFORMATION ASSESSMENT IN SCALES MEASUREMENT SIMULATION

The paper deals with the data assessment and implementation of scale measurement simulation using computation by PC. The PC simulation was applied to the newly developed method of the raster scales measurement. The metrological functions of the computer simulation are described explaining the new method of circular scales measurement, and the main features of the system are also explained. Computer simulation (CS) system consists of the object of measurement – the circular scale – and the reference measure, scale-reading sensors, the registration of their readings and their processing. The equations of the result evaluation are given, for which the statistical means are used for result evaluation. The diagram of the CS system is presented. The system is developed to fulfil the tasks necessary for engineering and education. The measurement is simulated to assess the metrological properties of the method applied and for educational purposes as well. The interactive mode of measurement is simulated to change the parameters being measured and to use the static and dynamic modes of measurement. The results of measurement are calculated using the equations with large number of unknown parameters, expressing the errors of the scale.

Albert Weckenmann, Sebastian Beetz
COMPUTER-BASED INTEGRATED ASSISTANCE FOR COORDINATE MEASUREMENTS

The constant increase of the application areas of coordinate metrology is due to the universality and flexibility of coordinate measurement machines (CMMs). Their varied applications require a high degree of knowledge by the CMM operator. In coordinate metrology, the operator is the main cause for uncertainties. The aim is to achieve small uncertainties, so that reliable and predominantly operator-independent measurement results can be obtained. To reduce these effects, it is necessary to support the CMM operator during his measuring tasks.

Ludwik Finkelstein
ANALYSIS OF THE CONCEPTS OF MEASUREMENT, INFORMATION AND KNOWLEDGE

The paper presents an outline of the philosophical and formal logical analysis of the fundamental concepts of measurement, information, knowledge and knowledge application, It considers the relation between them.

Page 888 of 912 Results 8871 - 8880 of 9113