scholarly journals Criteria for multiphysical similarity of the trawl complex

2021 ◽  
pp. 232-237
Author(s):  
А.А. Недоступ ◽  
А.О. Ражев
Keyword(s):  
Computer Program ◽  
Similarity Criteria ◽  
Self Similarity ◽  
Output Characteristics ◽  
And Control ◽  
Soil Dynamic

При решении основных задач проектирования и управления тралового комплекса, характеризующие: механические; гидродинамические; грунтодинамические; трибологические; электродинамические; термодинамические; световые; акустические и оптические процессы возникает необходимость обеспечения критериев подобия соответствующих процессов, выполнение автомодельности для сокращения параметров, влияющих на выходные характеристики тралового комплекса. В данной статье рассмотрены критерии мультифизического подобия траловых комплексов (донного и разноглубинного). Критерии мультифизического подобия тралового комплекса определенны с помощью теории мультифизического подобия тралового комплекса. В результате были теоретически обоснованы критерии мультифизического подобия тралового комплекса, на основе которых была разработана программа для ЭВМ «Критерии мультифизического подобия процессов рыболовства». When solving the main problems of design and control of the trawl complex, characterizing: mechanical; hydrodynamic; soil-dynamic; tribological; electrodynamic; thermodynamic; light; acoustic and optical processes, it becomes necessary to provide similarity criteria for the corresponding processes, to perform self-similarity to reduce the parameters that affect the output characteristics of the trawl complex. This article discusses the criteria for the multiphysical similarity of trawl complexes (bottom and midwater). The criteria for the multiphysical similarity of the trawl complex are determined using the theory of the multiphysical similarity of the trawl complex. As a result, the criteria of the multiphysical similarity of the trawl complex were theoretically substantiated, on the basis of which the computer program «Criteria for the multiphysical similarity of fishing processes» was developed.

Synergetic Concept of Software Control of Machining Processes on Metal-Cutting Machines

2021 ◽  
pp. 24-36
Author(s):  
V.L. Zakovorotny ◽  
V.E. Gvindzhiliya
Keyword(s):  
Tool Wear ◽  
Metal Cutting ◽  
Wear Testing ◽  
External Control ◽  
Machining Processes ◽  
Cutting Zone ◽  
Output Characteristics ◽  
The Cost ◽  
And Control ◽  
Cutting System

High precision metal-cutting machines ensure that the programmed machine actuator trajectories correspond to the real ones. For lathes these are the trajectories of the longitudinal and transverse calipers of the system, as well as the spindle. The purpose of processing is to produce parts of a given quality while minimizing the manufacturing costs. The condition of the dynamic cutting system, determined by the trajectories of forces and deformations, affects the quality indicators of parts and the cutting efficiency, which depends on the intensity of tool wear. The properties of the system change depending on the phase trajectory of the power of irreversible transformations of the energy supplied to the cutting zone by the work performed. Their changes related with the evolution of the parameters of the dynamic link formed by cutting are manifested in the development of tool wear and changes in the quality of the part. Thus, the power of irreversible energy transformations is one of the internal factors causing changes in the output characteristics of processing and the state of the process. In this regard, when processing on machine tools, there is a problem of synergistic coordination of external control (for example, the CNC program) with internal one, the source of which is the irreversible transformation of the energy supplied to the cutting zone. The article considers the problem of synergetic coordination of external and internal controls during cutting process, the solution of which will allow increasing the efficiency of processing on CNC machines. A mathematical model of a controlled dynamic cutting system and control algorithms are proposed to improve the efficiency of processing parts of a given quality while minimizing the intensity of tool wear. Testing of the developed algorithms has shown that their use reduces the cost of manufacturing parts by 1.2.

Similarity Criteria for Manipulator Loading and Control Sensitivity Characteristics

1998 ◽  
Vol 21 (2) ◽  
pp. 307-313 ◽  
Author(s):  
Victor V. Rodchenko ◽  
Larisa E. Zaichik ◽  
Yury P. Yashin
Keyword(s):  
Similarity Criteria ◽  
And Control

Analysis and Modeling of the Vortex Amplifier

1969 ◽  
Vol 91 (4) ◽  
pp. 755-763 ◽  
Author(s):  
R. T. Bichara ◽  
P. A. Orner
Keyword(s):  
Experimental Data ◽  
Steady State ◽  
Computer Program ◽  
Flow Regime ◽  
Incompressible Flow ◽  
Digital Computer ◽  
Input Output ◽  
Critical Dimensions ◽  
Fluid Properties ◽  
Output Characteristics

A model has been derived to predict the steady-state input-output characteristics of vortex amplifiers operating in the incompressible flow regime. The model was correlated with experimental data to affect prediction of the influence of the operating fluid properties and the vortex valve critical dimensions on the valve characteristics. The model has been implemented in a digital computer program which includes procedures for the design of vortex valves with specified flow and pressure turndown ratios and the design of vortex amplifiers with proportional (single-valued) characteristics.

Fractal Analysis of the Attenuation of Noise Inflow to Bioreactors under Monotonic, Oscillating and Chaotic Conditions

2007 ◽  
Vol 5 (1) ◽  
Author(s):  
Pratap R Patnaik
Keyword(s):  
Large Scale ◽  
Continuous Fermentation ◽  
Fractal Dimensions ◽  
Self Similarity ◽  
Undesirable State ◽  
Bioreactor Operation ◽  
Neural Filter ◽  
And Control ◽  
Microbial Systems ◽  
Influence Of Noise

The influx of noise through inlet streams is often a problem in the operation of large-scale microbial fermentations. It can distort the otherwise smooth performance and, more seriously, displace the fermentation to an undesirable state. Therefore, removal or reduction of the noise content of measured data is important for retrieving the true process variables for bioreactor operation and control. This is done by noise filters, which are soft devices that process noisy data and generate less noisy values with identifiable features. Three types of filters have been compared here by applying them to a continuous fermentation by Saccharomyces cerevisiae under (a) monotonic, (b) oscillating and (c) chaotic operation. Recognising self-similarity as a characteristic feature under the influence of noise, fractal dimensions of the output concentrations are suggested as effective indexes of both noise-affected and noise-filtered performance. On this basis, a hybrid neural filter (HNF) was the best, an auto-associative neural filter (ANF) was somewhat inferior and an extended Kalman filter (EKF) the poorest. While these results and similar observations for other microbial systems favour the use of both fractal dimensions and the HNF, the EKF and other algorithmic filters have some merits, which are discussed.

CONFORMITY AND INDEPENDENCE REVISITED

1995 ◽  
Vol 23 (3) ◽  
pp. 217-222 ◽  
Author(s):  
Felix Neto
Keyword(s):  
University Students ◽  
Computer Program ◽  
American Culture ◽  
Peer Group ◽  
Psychology Students ◽  
Experimental Setting ◽  
Majority Group ◽  
Original Procedure ◽  
And Control ◽  
Group Opinion

This study aimed at investigating whether conformity in the experimental setting suggested by Asch was particularly related to American culture and less likely to be replicable elsewhere - e. g. in Portugal - as has been suggested more recently. Thus, Asch's classic conformity and independence experiment was replicated, using women psychology students in a Portuguese university as minority of one, unanimous majority group, and control Ss. The original procedure was re-enacted as similarly as possible using a computer program. Among “critical” Ss 59% conformed at least once, 28% yielded three to twelve times. Among control Ss 27% erred at least once, 3.3% made more than three errors. These differences between critical and control Ss were significant. Thus, recent university students in Portugal showed that the degree of conformity to a unanimous peer-group opinion remains observable. They reported considerable distress under the group pressure.

scholarly journals Research of Jiles-Atherton Dynamic Model in Giant Magnetostrictive Actuator

2016 ◽  
Vol 2016 ◽  
pp. 1-8
Author(s):  
Yongguang Liu ◽  
Xiaohui Gao ◽  
Chunxu Chen
Keyword(s):  
Mathematical Model ◽  
Dynamic Model ◽  
Control Strategies ◽  
Structural Parameters ◽  
Hysteresis Loops ◽  
Structural Dynamic ◽  
Magnetostrictive Actuator ◽  
Output Characteristics ◽  
And Control ◽  
Minor Hysteresis Loops

Due to the existence of multicoupled nonlinear factors in the giant magnetostrictive actuator (GMA), building precise mathematical model is highly important to study GMA’s characteristics and control strategies. Minor hysteresis loops near the bias magnetic field would be often applied because of its relatively good linearity. Load, friction, and disc spring stiffness seriously affect the output characteristics of the GMA in high frequency. Therefore, the current-displacement dynamic minor loops mathematical model coupling of electric-magnetic-machine is established according to Jiles-Atherton (J-A) dynamic model of hysteresis material, GMA structural dynamic equation, Ampere loop circuit law, and nonlinear piezomagnetic equation and demonstrates its correctness and effectiveness in the experiments. Finally, some laws are achieved between key structural parameters and output characteristics of GMA, which provides important theoretical foundation for structural design.

scholarly journals MPPT Control Strategy of Photovoltaic Cells Based on Duty Cycle Disturbance

2022 ◽  
Vol 2152 (1) ◽  
pp. 012024
Author(s):  
Ting Xu ◽  
Xin Gong ◽  
Longkai Liang
Keyword(s):  
Duty Cycle ◽  
Control Algorithm ◽  
Photovoltaic Cell ◽  
Environment Change ◽  
Photoelectric Conversion ◽  
Point Tracking ◽  
Output Characteristics ◽  
Power Point ◽  
And Control ◽  
Fuzzy Control Algorithm

Abstract Photovoltaic cell is a key part of solar power generation system, and whether its photoelectric conversion is sufficient is also called the maximum power point tracking problem, that is, photovoltaic cell MPPT. Different from the traditional MPPT control algorithm, this paper models and analyzes the output characteristics of solar cell. on this basis, proposes a fuzzy control algorithm based on duty cycle disturbance, and simulates it with MATLAB. The result shows the algorithm can well take into account the tracking speed and control accuracy when the external environment change.

Micro SCARA Robot for Miniature Parts Assembling

1997 ◽  
Vol 9 (5) ◽  
pp. 341-347
Author(s):  
Toyomi Miyagawa ◽  
◽  
Kohei Hori ◽  
Yukihisa Hasegawa ◽  
Koichi Suzumori ◽  
...  
Keyword(s):  
Degrees Of Freedom ◽  
Small Diameter ◽  
Reduction Gear ◽  
Optical Encoder ◽  
Scara Robot ◽  
Brushless Dc ◽  
Inspection Robot ◽  
Servo Actuator ◽  
Output Characteristics ◽  
And Control

In this report, application of newly developed ultra-small servo actuators to a micro SCARA robot is presented. An ultra-small servo actuator consists of a miniature brushless DC motor, a reduction gear, and an optical encoder for monitoring the rotation of the motor. Two prototypes of different sizes were developed: one is 3mm in diameter and 10mm in length, and the other is 5mm in diameter and 18mm in length. Including the vertical positioning of the hand the robot has three degrees of freedom. First, the structure of the ultra-small servo actuator is shown and then the output characteristics of the 3mmdiameter and the 5mm diameter servo actuators are described, respectively. Next, the structure and control system of the micro SCARA robot, which has a 24.5mmlong arm, are described. Finally, flexible micro actuators, combined in parallel and acting a miniature handling system, are reported. They enable the gentle handling of small, fragile objects. The prototype of this micro SCARA robot enables the assembly of miniature objects in a small space. In the future, we expect this robot to find application as an inspection robot in narrow spaces, such as in small-diameter pipelines.

scholarly journals A Software Environment for the Modelling, Simulation and Control of Industrial Gas Turbine Engines

1991 ◽  
Author(s):  
C. Poole ◽  
A. G. Salsi ◽  
F. S. Bhinder ◽  
S. Kumar
Keyword(s):  
Computer Program ◽  
Gas Turbine ◽  
Turbine Engines ◽  
Gas Turbine Engines ◽  
Software Environment ◽  
Turbine Engine ◽  
Simulation And Control ◽  
Industrial Gas Turbine ◽  
And Control ◽  
Modelling Simulation

This paper describes a computer program which has been developed to simulate industrial gas turbine engines to aid the design and application of fuel controllers. It explains the program structure and, as an example, gives the application of the program to the modelling of a simple two shaft industrial gas turbine engine. A brief discussion of the value of the implementation language, C++, is also given.

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