Fixed-Location Pulse Linear Prediction Coding Vocoder Model for Low Bit Rate Speech Coding

Ma, Zhen

doi:10.1155/2018/1732151

Cited by 19 publications

References 13 publications

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Event‐triggered control for bipartite consensus and formation of multiple wheeled mobile robots with non‐holonomic constraint

Chen

2021

Asian Journal of Control

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This paper studies the event-triggered control scheme to tackle the position centroid bipartite consensus/formation problems of multiple wheeled mobile robots with non-holonomic constraint. Based on a reversible input conversion, the dynamics of the reference positions of robots are described as two teams of first-order integrators. The event-triggered control input and the event-triggering condition are constructed, ensuring that the position of each robot converges to the initial bipartite centroid location while their orientations and velocities reach some constants and zero, respectively. Moreover, we exclude the possibility of Zeno behavior. Subsequently, the proposed event-triggered control mechanism is expanded to drive all robots to meet at the expected geometric pattern centred at the initial bipartite centroid. At last, simulations are given to validate the effectiveness of the provided theoretical strategy.

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Event‐triggered control for bipartite consensus and formation of multiple wheeled mobile robots with non‐holonomic constraint

Chen

2021

Asian Journal of Control

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Field and simulation study of the rational retracement channel position and control strategy in close‐distance coal seams

et al. 2022

Energy Science & Engineering

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Different from single coal seam mining, the stress evolution in the end mining stage of close-distance coal seams is extremely complex. The unreasonable position and support of the lower retracement channel will cause serious deformation and damage to the surrounding rock. Taking the Yanzishan coal mine as the engineering background, the deformation and failure characteristics of the retracement channel under different overlay environments and the key influencing factors of position design were discussed by numerical simulation, theoretical analysis, and field investigation. The results show that the coupling superposition of upper coal pillar high stress and mining dynamic pressure will form a dangerous area with severe ground pressure behavior. The retracement channel should be preferentially designed in zone A (overlying mining roadways), followed by zone B (overlying end-mining coal pillar), and finally, zone C (overlying section coal pillar). In addition, the rational horizontal distance between the lower retracement channel and the upper end-mining coal pillar should make the channel in a good stress environment. The safety distance between the retracement channel and the nearest main roadway (end-mining coal pillar width) should be greater than the severe range of advance abutment pressure. Finally, the design principle and control strategy for the lower retracement channel is proposed. The feasibility and rationality of the study are verified by industrial applications.

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Evolution law and application of permeability in gob without coal pillar and self‐formed roadway

Liu

Feng

2022

Energy Science & Engineering

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Roof-cutting and pressure-releasing technology are used to cut out the pressure transmission line of the critical blocks in the roof, causing the roof to totally collapse in the gob, while the NPR large deformation anchor cable support keeps the highway in its self-formed state. The gangue compactness has increased greatly when fully collapsed and filled to the gob's edge. At the end of the working face, the void ratio between rock blocks and the loose area is decreased, resulting in an observable shortening of the airflow disturbance distance at the working face and a change in the disaster gas accumulation law in the deep gob. It is critical to obtain the permeability characteristics of gob to avoid hazardous gas migration. The evolutionary model of the permeability of the mined-out region is created based on the analysis of the movement law of the overburden strata and the collapsed law of the gangue in the gob, and the "Z" ventilation model is built to research the airflow law in the gob. The following are the key conclusions reached: The 0-10 m airflow exchange zone is severe, the 10-45 m airflow return face is weak, the 45-190 m section airflow exchange is weak, and the 190-280 m section airflow confluence gob enhances the top corner's weak air area. The 0-50 m part of the self-formed Roadway has a wide air leakage channel, and good sealing methods have a significant impact on air leakage in the working face. The two-dimensional model constructed by comprehensive quantification of the main controlling factors, such as broken-expand, pressure, and filling degree, can represent the law of gas migration in the panel to a significant extent, and the reliability of the permeability evolution law is confirmed through data comparison and analysis.

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Fixed-Location Pulse Linear Prediction Coding Vocoder Model for Low Bit Rate Speech Coding

Cited by 19 publications

References 13 publications

Event‐triggered control for bipartite consensus and formation of multiple wheeled mobile robots with non‐holonomic constraint

Event‐triggered control for bipartite consensus and formation of multiple wheeled mobile robots with non‐holonomic constraint

Field and simulation study of the rational retracement channel position and control strategy in close‐distance coal seams

Evolution law and application of permeability in gob without coal pillar and self‐formed roadway

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