Papers by Keyword: Mechanical Measurement

Abstract: This paper discusses the relevant concepts, algorithms and the practical evaluation process on the intelligent evaluation of uncertainty of mechanical measurement with the use of computer technology (such as Computer-Aided Evaluation System). Through the optimization and integration of evaluation process, key points and regulative relationship, the author makes use of computer-aided calculation and database technology to achieve standardization of evaluation process, intelligent data analysis and automatic calculation of uncertainty.

Abstract: This paper discusses the current situation and problems of large bearing size measurement technology, and analyses the principle and the features of mechanical measurement, optical electronic measurement and modern optical measurement. Focus on the principle and the key technology of the light pen measurement as well as its application into the size measurement of the large bearings.

Abstract: The corio-epidermal junction (CEJ) of equine hoof is highly vascularized, tough, but flexible suspensory apparatus between the wall of the hoof and the third distal phalanx. The connection created by leaf-like lamellae has a key role in the solidity and health of the hoof. In this study we focus on mechanical behaviour of CEJ under tensile loading and on the origin and spatial spreading of cracks of CEJ produced by stress exceeding the ultimate strength of the junction. The results show visible relation between mechanical results and structural parameters: the probability of rupture origin is higher in the case of small values of Young’s moduli of elasticity in region with small deformations and small values of 2D length density in dermal region.

Abstract: For functional properties such as gliding, sealing, assembling, adhering etc. the outer layer of the surface is the functional related surface. For the functional assessment of the surface this outer layer should be used as the reference for any functional characteristic. With the existing mean line system for the assessment of roughness and waviness, the standardized characteristics do not follow this logic. However there are valid historical reasons for the acceptance of the shortcomings of the mean line system. They are e.g. the alignment of the profile, the removal of form, the assumption of a sinusoidal structure of the waviness on the surface, and the distortion of the surface by the application of the mean line filtering process. To overcome these shortcomings morphological operations have been used to establish a new developed envelope system. In order to define new parameters to characterize and specify functional properties of surfaces, a common datum is necessary. The presented method for the alignment of datums is consistent with the algorithms used to establish datums and datum systems for workpieces, where the datum is established by the location of a tangent geometrical element such as a line, plane, cylinder etc. The orientation is usually derived by the application of the minimum zone algorithm. The benefit of the assessment of the functional properties of surfaces with morphological operations will be presented for two examples.

Abstract: The object of this paper is to describe the process and current status of the development project of an Ultra Precision Gear Measuring Instrument that guarantees a measurement accuracy that falls into a submicron range. The angular indexing mechanism, which is the basis of its measurement accuracy, consists of a purely mechanical system. The system is based on the concept of accuracy feedback where its own deviation estimated from measurement results is fed back into the finishing process. It consists of basic axes with minimum error causing factors in order to seek the optimum accuracy that can be achieved by precision machinery. The measurement accuracy of this measuring instrument has already reached the submicron range in its initial assembly state.

Abstract: An optical-electronic measurement system for continuous monitoring of displacements and analysis of the friction pendulum bearings for the oil-drilling platforms is presented. Measuring principle of the system is based on target image formation by camera and digital image processing. The passive part of the system (optical target) is fixed on one part of construction while active part - a field measurement sensor (FMS) - is installed on another part of construction that moves relative to the first one. On the FMS output, after processing, the relative displacement between FMS and optical target is obtained with high degree of accuracy. The spatial resolution of a few micrometers can be achieved at cost of reduced measurement range.