Electrical discharge machining (EDM) is well established machining technique mainly used to machine complex geometries on difficult-to-machine materials and high strength temperature resistant alloys. In the present research, the objective is to study the shape of the electrode and establish the application of liquid nitrogen in reducing distortion of the electrode during electrical discharge m...

The main goal of the minimum zone tolerance (MZT) method is to achieve the best estimation of the roundness error, but it is computationally intensive. This paper describes the application of a genetic algorithm (GA) to minimize the computation time in the evaluation of CMM roundness errors of a large cloud of sampled datapoints (0.2° equally spaced datapoints). Computational experiments have s...

The present study examines two methods for learning and modeling vowel harmony from text corpora. The first uses Expectation Maximization with Hidden Markov Models to find the most probable HMM for a training corpus. The second uses pointwise Mutual Information between distant vowels in a Boltzmann distribution, along with the Minimal Description Length principle to find and model vowel harmony...

Roundness and cylindricity evaluations are among the most important problems in computational metrology, and are based on sets of surface measurements (input data points). A recent approach to such evaluations is based on a linear-programming approach yielding a rapidly converging solution. Such a solution is determined by a fixed-size subset of a large input set. With the intent to simplify th...

In this study, feature extraction processes were performed based on the image processing techniques using morphological, shape and color features for five different rice varieties of same brand. A total 75 thousand pieces grain obtained, including 15 each variety rice. Pre-processing operations applied to images made available extraction. 106 inferred from images; 12 morphological 4 obtained 90...

The rotation accuracy of the aerostatic spindle can easily be affected by shaft shape errors due to small gas film clearance. Thus, main with largest scale—that is, roundness and cylindricity errors—are studied in this paper, a dynamic mathematical model is established consideration roundness, errors, speed. In order construct model, discrete coefficient index radius based on measurement data a...

We apply a Bayesian belief network (BN) approach to vowel duration modelling, whereby vowel segment duration is modelled as a hybrid Bayesian network consisting of discrete and continuous nodes, with the nodes in the network representing linguistic factors that affect segment duration. Factor interaction is modelled in a concise way by causal relationships among the nodes in a directed acyclic ...

In the paper, an issue of CMM measurement strategy sleeves and pins designed for wear tests in cycloidal drive. The was proposed, based on initial out-of-roundness scanning mode. Proposed approach ensured that pin measured along its entire 40 mm length with only small area fixation ca. 5 left out, all probing points cylindricity deviation assessment were collected one fixation. It demonstrated ...