Cezary Kaczmarek, Zdzislaw Kaczmarek
In the paper the structure and the operating principle of impulsive force and pressure sensors applied in tasks of reconstruction is presented, which feature one point and two point measurement of the strain inside a Hopkinson bar type mechanical transducer. A comparison between the two versions of the sensor was carried out, taking into consideration the processing accuracy, the complexity of the conditioning circuit and the input signal processing circuit. The preferred application range is given for each version of the sensor.
Joint International Conference on Force, Mass, Torque, Hardness and Civil Engineering Metrology in the age of globalization
· TC3
· 2002
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Koji Ohgushi, Takashi Ota, Kazunaga Ueda, Eiji Furuta
A deadweight torque standard machine of rated capacity 20 kN·m (20 kN·m-DWTSM) was designed and developed, following the development of a 1 kN·m torque standard machine (1 kN·m-DWTSM) at NMIJ/AIST. This machine has a variety of features enabling it to perform precise measurements of torque, including double aerostatic bearings used in the form of a fulcrum. This paper outlines the torque standard machine.
Joint International Conference on Force, Mass, Torque, Hardness and Civil Engineering Metrology in the age of globalization
· TC3
· 2002
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A. A. El-Sayed, H. M. El-Hakeem, B. Gloeckner, T. Allgeier
A new dead weight force standard machine covering the range from 5 kN to 500 kN direct weights has been designed and constructed at the National Institute for Standards (NIS)- Egypt, by Gassmann Theiss Messtechnik GmbH (GTM). The machine capacity can be duplicated to 1000 kN by means of a substitute force generator. The machine has been verified through a comprehensive Inter-laboratory Comparison Programme run over a period of two years at the Physikalisch-Technische Bundesanstalt (PTB) of Germany and NIS of Egypt. A well-selected set of high precision force transfer standards was used in...
Joint International Conference on Force, Mass, Torque, Hardness and Civil Engineering Metrology in the age of globalization
· TC3
· 2002
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Claudia Santo, José Fuentes, Juan M. Curbelo
The current paper provides the details of the main sources of uncertainty that occur when conventional mass determinations are performed in analytical balances. The data presented correspond to the calibration of 18 analytical balances that belong to LATU, together with the detailed quantification of each of the sources of uncertainty. The results of a comparison of conventional mass measurement performed in those balances with a Teflon sample are assessed, considering their uncertainty values. Conclusions are subsequently drawn on conventional mass measurement's reproducibility in...
Joint International Conference on Force, Mass, Torque, Hardness and Civil Engineering Metrology in the age of globalization
· TC3
· 2002
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F. Tegtmeier, M. Peters
An important element in the supervision of buildings is the necessary precise and continuous measurement of stress conditions. For this purpose, an encapsulated measuring sensor as developed which protects the sensitive strain-gauge technology within it and which can be easily inserted into measurement boreholes. The mechanical adaptation is effected by optimising a process of deformation of two conical bodies such that the envisaged measuring range covers the range of elastic deformation of construction steels. Suitable calibration procedures as well as measurement methods for the early...
Joint International Conference on Force, Mass, Torque, Hardness and Civil Engineering Metrology in the age of globalization
· TC3
· 2002
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Andrei Marinescu, Gheorghe Opran, Dorin Popa, Amritlal Sawla, Günther Haucke
In 1997 the High Force Calibration Laboratory from ICMET Craiova was accredited by DKD. The laboratory has a metrological test and calibration machine for the range 0.5 MN to 32 MN and the traceability to the German standard is ensured by means of periodic checks with 2 MN, 5 MN and 16 MN transfer standards of PTB and 2 MN and 10 MN transfer standards of ICMET. The paper contains a short presentation of the 32 MN machine, the results of its periodical checks performed within 1995-2002. A special attention is paid to the tests performed in 2001 with 2 MN and 16 MN PTB transfer standards...
Joint International Conference on Force, Mass, Torque, Hardness and Civil Engineering Metrology in the age of globalization
· TC3
· 2002
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Kazunaga Ueda, Toshiyuki Hayashi, Koji Ohgushi, Hiroshi Maejima, Yukio Yamaguchi
This paper proposes a new approach for evaluating the uncertainty in the traceability system of force with the following features. a) Repeatability/reproducibility is evaluated by the Type A evaluation. b) Data taken in each orientation is treated with equality. c) Deviations from reference values and from the interpolation equation are considered to be equal to the standard deviation 1s of a normal distribution. d) Difference of the values in increasing load and in decreasing load are considered as a half-width of the possible distribution of values to be measured. The same is the case of...
Joint International Conference on Force, Mass, Torque, Hardness and Civil Engineering Metrology in the age of globalization
· TC3
· 2002
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L. Doering, J. Frühauf, U. Brand
The measurement of material properties and dimensional metrology are often carried out by mechanical probing using small spherical probing balls. Well-known instruments, such as microhardness measuring instruments, atomic force microscopes, stylus instruments and coordinate measuring machines operate in this way. With increasing miniaturisation and high precision requirements for measurement, these probing systems become ever finer, i.e. the radius of the probing spheres used becomes ever smaller. It therefore is necessary to increase the resolution and accuracy of the measurement. This...
Joint International Conference on Force, Mass, Torque, Hardness and Civil Engineering Metrology in the age of globalization
· TC3
· 2002
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Kazuhiro Kodama, Tomohide Kesamaru, Motoyuki Adachi, Kazuyuki Kamimura, Shigeru Kurosu
This paper concerns the development of an entirely new force sensor called Gyroscopic Force Measuring System (simply called GFMS) for measuring a force vectorially. In a previous paper, the dynamical characteristics and the error analysis of the GFMS for measuring a force vector in 3-dimensional space were examined using numerical simulations. The results of this work are directly applicable to design and construction of the GFMS. In this paper, the GFMS is constructed by a gyro-rotor used a miniature rate-gyro for aircraft instrument and mechanical parts together. In order to verify the...
Joint International Conference on Force, Mass, Torque, Hardness and Civil Engineering Metrology in the age of globalization
· TC3
· 2002
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Takanori Yamazaki, Yoshiharu Sakurai, Hideo Ohnishi, Masaaki Kobayashi, Shigeru Kurosu
This work is concerned with the development of a signal processing algorithm for checkweighers to realize much higher speed of operation and highly accurate measurement of mass of object during crossing a conveyor belt. Continuous measurement means that masses of discrete objects on a conveyor belt are determined in sequence. Checkweighers usually have maximum capacities of less than 75 kg and achieve measuring rates of 150 packages per minute and more. The output signals from the checkweighers are always contaminated with noises due to vibrations of the conveyor belt and the object in...
Joint International Conference on Force, Mass, Torque, Hardness and Civil Engineering Metrology in the age of globalization
· TC3
· 2002
· Download