9762 papers found
This article is aimed on presenting our research focusing on force of direct punch. Punches are very important part in a professional defence. Our goal was to measure dependence of force on time. Then we found differences between genders and among groups of participants with different level of training. In this study more than 200 participants took part.
The progress of our tiltmeter, which bases on force compensating weigh cells (EMFC) is discussed in this paper. Currently a resolution of ~ 1 nrad at a range of ± 9 mrad, a linearity of < 0.25 · 10 -3 and a cross error of the axes of < ± 22 ppm is achieved. Long term measurements of earth tide related tilts demonstrate the ability to resolve tilts with very small frequencies (1 – 2 d -1 ). Prospectively it will be applied to measure and control tilting of measurement basements and tables.
This paper discusses the determination of spring constants of AFM-cantilevers using a force displacement measurement device based on electromagnetic force compensated (EMFC) load cells. The EMFC load cell was modified to utilize it as a combined displacement and force measurement device enabling the possibility to determine the spring constant of AFM-cantilevers with one sensor without the need of an additional displacement setting stage. The paper focuses on the determination of spring constants and the determination of the measurement uncertainty, which is down to 2.75 %.
Calibration with high forces is needed more and more. Deadweight force machines are the first choice for the lowest measurement uncertainty in force realization but their capacity cannot be extended to extrem high forces, as these becomes too expensive and too large in size. The hydraulic force standard machine is a perfect economic solution for highest values in force realization with suitable measurement uncertainty. This paper describes the new GTM 10 MN hydraulic force standard machine.
Investigations of the model-based dynamic calibration of a force transducer of high bandwidth revealed new challenges for parameter identification. This paper discusses a more generalized mechanical model of the calibration set-up employed. Based on new experimental sine and shock force data, the improved model is studied and its parameters are identified. It is shown that the proposed model is capable of linking the calibration results of both calibration methods to a much better degree.
A robotic mass comparator is a very productive, reliable and accurate piece of equipment used by national institutes, calibration laboratories and weights producers to calibrate all weight classes from the smallest available weight, starting from 0.05mg, up to 20kg. This paper gives an overview of robotic systems, the ideal operation and the relevant factors which have to be taken into consideration when calibrating mass.
Force sensors based on the principle of symmetric radial shear beams are known from their advantages in the fields of material testing, experimental mechanics and industrial process control. In the last years those kinds of sensors became more and more important in the field of calibration. Newest developments do now show that the class 00 according the ISO 376 standard is visible for radial symmetric shear types for compression forces.
The dynamic calibration of torque transducers requires the modelling of the measuring device and of the transducer under test. The transducer’s dynamic properties are described by means of model parameters, which are going to be identified from measurement data. To be able to do so, two transfer functions are calculated. In this paper, the transfer functions and the procedure for the model parameter identification are presented. An example shows results of the parameter identification.
We report a high-performance flexible tactile sensor capable of measuring 3-axial forces, which consists of an array with a size of 8 × 8 integrated in an area of 10 mm². Each cell has four strain gauges to detect 3-axial forces. The strain gauge is made of an inorganic silicon membrane. We fabricated the tactile sensor through a combination of a conventional batch micromachining process and a dry-transfer-printing technique. The fabricated tactile sensor showed a repeatable error less than 1 %, a minimum detectable force better than 0.5 g and a minimal crosstalk among 3-axial forces.
The automatic setup for touch-trigger probes’ triggering force was developed as a modification of the setup for testing of the probes’ triggering radius using the moving master artefact method. In this paper, construction of the setup, its principle of operation and its uncertainty’s estimation are presented, as well as exemplary results – characteristics of the triggering force of 2 probes for CNC machine tools: OMP40-2 3-point kinematic probe and IRP32.00-MINI 1-point kinematic probe.