INVESTIGATION OF RESONANT PHENOMENA IN UNDERGROUND ELECTRICAL NETWORKS OF HIGH-PERFORMANCE COAL MINES

2021 ◽  
pp. 13-25
Author(s):  
Leonid Aleksandrovich Plaschansky ◽  
Sergey Nikolaevich Reshetnyak ◽  
Maria Yuryevna Reshetnyak
Keyword(s):  
High Performance ◽  
Coal Mines ◽  
Electrical Networks ◽  
Resonant Phenomena

An Active-Passive Piezoelectric Vibration Absorber for Structural Control Under Harmonic Excitations With Time-Varying Frequency

2000 ◽  
Author(s):  
Ronald A. Morgan ◽  
K. W. Wang
Keyword(s):  
Active Control ◽  
Structural Control ◽  
High Performance ◽  
Piezoelectric Materials ◽  
Negative Resistance ◽  
Electrical Circuit ◽  
Superior Performance ◽  
Electrical Networks ◽  
Harmonic Excitations ◽  
Time Varying Frequency

Abstract It has been shown that piezoelectric materials can be used as passive electromechanical vibration absorbers when shunted by electrical networks. Semi-active piezoelectric absorbers have also been proposed for suppressing harmonic excitations with varying frequency. However, these semi-active devices have limitations that restrict their applications. The design presented here is a high performance active-passive alternative to semi-active absorbers that uses a combination of a passive electrical circuit and active control actions. The active control consists of three parts: an adaptive inductor tuning action, a negative resistance action, and a coupling enhancement action. A formulation for the optimal tuning of the piezoelectric absorber inductance on a multiple degree of freedom (MDOF) structure is derived. The effectiveness of the proposed system is demonstrated experimentally on a system under a variable frequency excitation. Extensive parameter studies are also carried out to show that the proposed design offers superior performance and efficiency compared to other state-of-the-art control methods.

ANALYSIS OF THE INTEGRATED TECHNOLOGY OF HIGH-PERFORMANCE MINING OF STOCKS OF EXCAVATION SITES OF COAL MINES

Ugol ◽  
2019 ◽  
pp. 40-45 ◽  
Author(s):  
N.I. Abramkin ◽  
◽  
A.V. Dorodniy ◽  
I.U. Buharbaev ◽  
◽  
...  
Keyword(s):  
High Performance ◽  
Coal Mines ◽  
Integrated Technology

An Active-Passive Piezoelectric Absorber for Structural Vibration Control Under Harmonic Excitations With Time-Varying Frequency, Part 1: Algorithm Development and Analysis

2001 ◽  
Vol 124 (1) ◽  
pp. 77-83 ◽  
Author(s):  
R. A. Morgan ◽  
K. W. Wang
Keyword(s):  
Active Control ◽  
High Performance ◽  
Piezoelectric Materials ◽  
Negative Resistance ◽  
Electrical Circuit ◽  
Structural Vibration ◽  
Experimental Investigations ◽  
Electrical Networks ◽  
Practical Applications ◽  
Harmonic Excitations

It has been shown that piezoelectric materials can be used as passive electromechanical vibration absorbers by shunting them with electrical networks. Semi-active piezoelectric absorbers have also been proposed for suppressing harmonic excitations with varying frequency. However, these semi-active devices have limitations that restrict their practical applications. The approach presented here is a high performance active-passive alternative to semi-active absorbers. By utilizing a combination of a passive electrical circuit and active control actions, the system is synthesized for adaptive variable frequency narrowband disturbance rejection. The active control consists of three parts: an inductor tuning action, a negative resistance action, and a coupling enhancement action. In the current paper (Part 1), the control algorithm is developed and analyzed. Part 2 of the paper contains experimental investigations and parametric studies of the new absorber design.

scholarly journals Reproduction of the longwall panels: modern requirements for the technology and organization of the development operations at coal mines

2020 ◽  
pp. 19-23
Author(s):  
O. I. Kazanin ◽  
◽  
A. A. Sidorenko ◽  
S. A. Sidorenko ◽  
A. A. Meshkov ◽  
...  
Keyword(s):  
Coal Mining ◽  
Cost Reduction ◽  
High Performance ◽  
Coal Mines ◽  
High Rate ◽  
Coal Production ◽  
Action Time ◽  
Efficiency Increase ◽  
The Common

The authors point at the criticality of timely reproduction of longwall panels in coal mines toward sustainable and high-rate coal mining based on the utilization potential of modern longwall equipment. A case-study of SUEK-Kuzbass mines shows that there is a need to change approaches to improvement of economic efficiency and competitiveness of coal mining and to shift from the common practice of production cost reduction to productivity enhancement through implementation of high-performance equipment capabilities. Efficiency of road heading in mines of SUEK-Kuzbass is analyzed, and the main causes of long downtime in operation of modern high-performance continuous miners (CM) or continuous bolter miners (CBM) are identified. Recommendations have been developed for improved planning of preparatory works in mines and for introduction of significant action time margin to eliminate downtime when actual drivage performance lags behind the planning data. The action time structure of modern CBM is presented, and recommendations are given on CBM efficiency evaluation as actual action time in cutting road face rocks. The application areas of various modern CBM types are justified. Recommendations are proposed for changing the parameters of longwall panels and to change to multi-entry longwall panels in order to increase efficiency of preparatory works and actual coal production. The authors describe expediency of widespread use of shuttle cars to improve efficiency of haulage of rocks and materials. The organizational and technological principles of the efficiency increase in preparatory works in coal mines are substantiated.

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