Dynamic forces realised by accelerated load masses are traceable to acceleration and mass according to the force definition. For the reduction of the measurement uncertainty, the acceleration distribution of the acting mass has to be determined with higher accuracy. This is possible by using laser interferometer and suitable methods for signal processing and data analysis. In particular a method of using heterodyne laser interferometer for dynamic force calibration is investigated. Different signal processing and data analysing methods are compared. A force transducer is investigated with...
Large quantities of commodities in different sizes transported on belt conveyors should often be measured automatically by two or three conveyor belt scales. Continuous measurement can be dynamically performed by multi-stage conveyor belt scales, so that the masses of discrete objects on belt conveyors can be determined in sequence according to the different lengths. Belt conveyor scales usually have maximum capacities of less than 80kg and 130cm, and achieve measuring rates of 150 packages per minutes and more. The output signals from the multistage conveyor belt scales are always...
Dynamic forces realised by accelerated load masses are traceable to acceleration and mass according to the force definition. For the extension of the dynamic force range a new facility based on an electrodynamic shaker system is developed.
A new hydraulic type build up force standard machine with a 3 MN loading capacity both in tension and compression modes is installed in Force Measurment Laboratory of UME. The machine is designed and manufactured by ÖZMAK Manufacturing Company according to the technical specifications outlined by UME. The performance test results show that relative measurement uncertainty of a new 3 MN build-up machine of UME is better than 4·10 -4 .
The hydrostatic weighing apparatus using two zerodur density standard spheres is built, and the weight exchanger, which is composed of a weight pan with the shape of a conoid and the standard weights with a slot, is constructed. In addition, the temperature and density gradient of transfer liquid are precisely corrected according to the measuring position of the liquid container. As a result, the volume of 1 kg standard weight in a class E1 obtains 124,90388 cm³ at 20°C with a precision of 8.4·10 -5 cm³ (0,67 ppm) by hydrostatic weighing, and the measurement uncertainty shows 3.0·10 -4 cm³...
The Mexican Density Standard is starting operation as a national reference. In the present paper, it is presented the data analysis in hydrostatic weighing, the uncertainty estimation and its validation by Monte Carlo’s Method of the transfer of accuracy of the National Density Standard of Mexico.
Magnetization of a mass standard can lead to weighing errors. This is because most modern balances are sources of non-uniform magnetic induction. Although the problem of unwanted magnetic forces is well known, the characterization of the magnetic properties of mass standards and balances can be problematic. This paper compares the kind of information that can be obtained from three types of instruments: Hall-probe gaussmeter, fluxgate magnetometer and susceptometer.
This paper is concerned with the problem of dynamic torque calibration. It presents the concept of a new calibration device designed at PTB, to provide traceability for dynamic calibration with sinusoidal torque. Furthermore some details of the measurement system, construction and data analysis will be discussed.
This paper gives an overview of rotating microsystems including the entire spectrum of dimensions from the sub-millimeter range to sizes of a few millimeters. Principles and instrumentation for micro torque measurement are described.
Steep pulse responses of force transducers are measured using a method under development. In the method, a mass is made to collide with a force transducer and the impact force is measured highly accurately as the inertial force acting on the mass. A pneumatic linear bearing is used to realize linear motion with sufficiently small friction acting on the mass, i.e., the moving part of the bearing.