scholarly journals Variable‐speed method for improving the performance of a mine counter‐rotating fan

2020 ◽  
Vol 8 (7) ◽  
pp. 2412-2425
Author(s):  
Zijian Ai ◽  
Guoliang Qin ◽  
Jingxiang Lin ◽  
Xuefei Chen ◽  
Wenqiang He
Keyword(s):  
Variable Speed ◽  
Speed Method

scholarly journals Deterministic-Probabilistic Method of Waterway Design Parameters Determination

2012 ◽  
Vol 19 (2) ◽  
pp. 19-30
Author(s):  
Stanisław Gucma ◽  
Paweł Zalewski
Keyword(s):  
Probabilistic Method ◽  
Design Parameters ◽  
Spline Functions ◽  
Variable Speed ◽  
Minimum Width ◽  
Deterministic Methods ◽  
Positioning Method ◽  
Type Variable ◽  
Transport Safety ◽  
Speed Method

Abstract The paper presents a method of recommended waterway parameters determination, based on modified relationships derived from actual empirical research - the authors’ combination of PIANC and Canadian deterministic methods and stochastic relationships). These relationships are mostly discontinuous functions (e.g. of ship type variable, speed, method of determining the position, etc.), which can be approximated by continuous spline functions. Application built in C# allows determining the recommended minimum width of the waterway, the width increase due to the accuracy of the vessel positioning method, and the minimum radius of waterway bends. The results can be further utilized in the Decision Support System for Water Transport Safety.

A Variable-Speed Method for Reducing Residual Vibrations in Elastic Cam-Follower Systems

2003 ◽  
Vol 125 (3) ◽  
pp. 480-482 ◽  
Author(s):  
Yan-An Yao ◽  
Hong-Sen Yan ◽  
Ce Zhang
Keyword(s):  
Optimal Control ◽  
Control Theory ◽  
Vibration Control ◽  
Optimal Control Theory ◽  
Variable Speed ◽  
Design Point ◽  
Parameter Variations ◽  
Cam Follower ◽  
Speed Method

This paper applies the concept of variable speeds to vibration control of elastic cam-follower systems. A multi-design-point approach, based on optimal control theory, is developed for selecting suitable input speed functions of the cam that can reduce both primary and residual vibrations of the output in elastic cam-follower systems despite parameter variations. A design example is given to verify the feasibility of the approach.

A Variable-Speed Method for Improving Motion Characteristics of Cam-Follower Systems

1996 ◽  
Vol 118 (2) ◽  
pp. 250-258 ◽  
Author(s):  
Hong-Sen Yan ◽  
Mi-Ching Tsai ◽  
Meng-Hui Hsu
Keyword(s):  
Design Method ◽  
Design Procedure ◽  
Design Criteria ◽  
Displacement Curve ◽  
Variable Speed ◽  
Traditional Design ◽  
Alternative Approach ◽  
Cam Follower ◽  
Motion Characteristics ◽  
Speed Method

A cam is often assumed to be operated at a constant speed in designing a cam-follower system. The motion characteristics of the follower are determined once the cam displacement curve is designed. The traditional design method for improving the motion characteristics is to find a new displacement curve which has better motion characteristics. This paper, however, presents an alternative approach by varying the speed of the cam to reduce the peak values of the follower output motion characteristics. Constraints and design criteria for selecting suitable cam speed trajectories are then developed. Finally, examples are given to illustrate the design procedure and also to show its feasibility.

A Variable Speed Groove-pulley

1913 ◽  
Vol 109 (8) ◽  
pp. 148-148
Author(s):  
F. E. Keller
Keyword(s):  
Variable Speed

168. Dynamic Aerosol Sizing with a Variable Speed Rotary Impactor

2003 ◽  
Author(s):  
P. Lilienfeld ◽  
D. Kita ◽  
K. Willeke
Keyword(s):  
Variable Speed

DESIGN, SIMULATION AND IMPLEMENTATION MONITORING SYSTEM FOR SYSTEM CONTROL C4 FEEDING PUMP FOR FEED VAPORIZATION IN THE BUTADIENE PLANT

2020 ◽  
Vol 1 (1) ◽  
pp. 31-35
Author(s):  
Fahmi Yunistyawan ◽  
Yunistyawan J Berchmans ◽  
Gembong Baskoro
Keyword(s):  
Motor Control ◽  
Control System ◽  
Field Operator ◽  
System Control ◽  
Variable Speed ◽  
Variable Speed Drive ◽  
Software And Hardware ◽  
Discharge Pressure ◽  
Selection Of

This study implements the auto start control system on an electric motor 3 phase C4Feeding pump when the discharge pressure is low-low (4.3 kg /cm²). The C4 feeding pumpmotor was initially manually operated from the local control station, this was very ineffectiveand inefficient because it still relied on the field operator to operate the pump motor and whenthe plant was in normal operating it is very risk if the field operator late to operate motor then itwill impact to quality of the product, and if the delay time to operate motor is too long then planthave to shut down, therefore improvement is needed in the C4 feeding pump motor controlsystem. In this paper, various types of 3-phase motor control are explained which allow it to beapplied to the C4 feeding pump motor that are on-off, inverter, and variable speed drive andefficient selection of the three systems control of the motor. Software and hardware used in thisthesis work are DCS CENTUM VP Yokogawa.

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