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.

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.

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.

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.

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.