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In constructing super‐large section shield tunnels, it is difficult to guarantee the filling efficiency and uniformity of grouting behind the segments. Studies on grout diffusion models often simplify the grout filling process, leading to inaccurate results, especially for shield tail void with special noncircular profiles. This paper presents a theoretical study on the grout filling diffusion mechanism...
A reliable coal seam surface model needs to reconcile all available geological data such as boreholes, cross-sections, and coal seam floor contour maps. In addition, the model should be updated when local geological information such as coal seam observations is available. This paper develops a Bayesian Geostatistical approach for coal seam surface modeling using multi-source geological data in different...
The digital content products, because of its characteristics of transmitting over the network, can be either purchased through traditional ordinary operators, or obtained through the Internet. A large number of providers of digital content sharing exist on Internet, parts of which are free of charge while the others are not. It is short of specialized research on the pricing mechanism of digital content...
Tool path planning of CNC motion controller includes tool path interpolation and velocity planning. Five-axis machine tools have been adopted in mold surface and aerospace part machining. In this paper, the kinematics frame based on dual quaternion D-H representation was applied to define the coordinates of five-axis machines systematically. Consequently, the kinematics parameter equation of the five-axis...
Feed rate has always been one of the most important indicators for CNC performance, while transfer velocity between two adjacent segments pays a key role in improving feed rate. Since the contour of a special part commonly consists of line and arc segments (non-micro segments), as well as continuous micro line segments (micro segments) so there should be different methods to deal with their transfer...
Applications for 5-axis have increased tremendously in recent years. Machining curved surfaces using CNC software represents a challenging task. The conventional interpolation algorithms for 5-axis CNC machining are focused on studying a curved surface is approximated by a linear grid of closely spaced points, which are traversed in a linear or circular interpolation mode to machine the desired shape...
Machining is a broad term to describe removal of material from a workpiece. Machining is one of the most widely used process to manufacture functional mechanical prototypes of parts. Conventional feedrate controls do not meet the demands of S-axis machining. To do this, a novel velocity profile algorithm was presented. This algorithm provided a more continuous feed motion. Smooth acceleration and...
5-axis machines are important in a number of industries ranging from aerospace to consumer-mold machining. The conventional interpolation algorithms for 5-axis CNC machining are focused on studying techniques to design position, orientation, and feedrate curves in such a way using isoparametric correspondence as to avoid excessive angular velocities. However, it is difficult to guarantee such correspondence...
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