Research on control system of electric tightening wrench based on rotational speed difference method

2020 ◽  
Author(s):  
Xuewei Fan ◽  
Xiaowu Wang ◽  
Feng Xie ◽  
Nan Tang
Keyword(s):  
Control System ◽  
Difference Method ◽  
Rotational Speed ◽  
Speed Difference

Synchronous Winches to Lift the Ship and Distributed Control System to Distribute the Motor Loads for Marine Using CAN Protocol

2017 ◽  
Vol 8 (2) ◽  
pp. 586
Author(s):  
R. Sundar
Keyword(s):  
Control System ◽  
Distributed Control ◽  
Rotational Speed ◽  
New Method ◽  
Distributed Control System ◽  
Dc Motors ◽  
As If

<p>A shiplift is a modern alternative for these older systems. It consists of a structural platform that is lifted and lowered exactly vertical, synchronously by a number of hoists. First, the platform is lowered underwater, then the ship is floated above the support, and finally the platform with ship is lifted and the ship is brought to the level of the harbor. The modern ship lifts use synchronous winches to hoist a ship.</p><p>Our project proposes a new method to construct an automated ship lifting installation. According to this, each hoisting winch is entirely controlled by a dedicated microcontroller. All such hoists on either side of the platform are networked via CAN. This result in a distributed control system that runs all the hoists synchronously, thereby achieving precisely distributed motor loads and assuring that ships cannot slip. The project uses four such hoists to raise and lower the platform. Hoists are driven by dc motors with the microcontroller controlling the winch rotational speed. Each hoist is a CAN node on the network. In order to safely operate any shiplift, all hoists must be perfectly synchronized. Winches operate at the specified speed, regardless of load, behaving as if they are mechanically coupled together. A fifth node on the network acts as the control and monitoring unit for the entire hoisting maneuver. It has switches to start and stop the process and LCD screen to display the distribution of motor loads. The Ship lifting speed is changes according to the weight of the ship.</p>

scholarly journals Probing Slip Differential Heat of Magnetorheological Fluids Subjected to Shear Mode Operation and Its Effect on the Structure

Materials ◽  
2019 ◽  
Vol 12 (11) ◽  
pp. 1860 ◽  
Author(s):  
Song Chen ◽  
Jing Yang
Keyword(s):  
Rotational Speed ◽  
Volume Fraction ◽  
Thermal Structure ◽  
Magnetorheological Fluids ◽  
Input Current ◽  
Shear Mode ◽  
Differential Heat ◽  
Speed Difference ◽  
Mode Operation ◽  
Excitation Coil

The paper probes slip differential heat of magnetorheological fluids (MRFs) subjected to shear mode operation and its effect on the structure. To begin, we present a novel model for measurement of slip differential heat to describe temperature rise of MRFs mainly caused by friction between magnetorheological particles. It includes two stages: (1) The micro-macro analysis of slip differential heat of MRFs including force, movement and heat between neighboring particles based on magnetic dipole and Hertzian contact theories, and (2) the further application to two basic disc-type and cylinder-type magnetorheological clutches combined with finite element simulations involving electromagnetic field and thermal analysis. The model takes into account the effect of each of the main influencing factors, such as the input current of excitation coil, the rotational speed difference of the clutches, the size and volume fraction of particles, the saturation magnetization of particles, and the structural size of the clutches, etc., on the slip differential heat of MRFs. Then the thermal structure analysis of MRFs comprising thermal deformation and equivalent thermal stress is carried out. Moreover, the effect of typical governing parameters on the slip power of MRFs and the influence of slip differential heat on the structure of MRFs are investigated individually. We show that such a model is effective in reflecting the temperature-slip time relation of MRFs. It is shown that the input current and the rotational speed difference have great effect on the slip power, and the slip differential heat has a certain influence on the micro-structure of MRFs.

Shifting the pulsatility by increasing the change in rotational speed for a rotary LVAD using a native heart load control system

2016 ◽  
Vol 19 (4) ◽  
pp. 315-321 ◽  
Author(s):  
Kazuma Date ◽  
Takashi Nishimura ◽  
Yoshiaki Takewa ◽  
Satoru Kishimoto ◽  
Mamoru Arakawa ◽  
...  
Keyword(s):  
Control System ◽  
Rotational Speed ◽  
Load Control

Evaluation of Rotational Speed Control System for Water Driven Spindle With Disturbance Observer

2015 ◽  
Author(s):  
Akio Hayashi ◽  
Yohichi Nakao
Keyword(s):  
Control System ◽  
Rotational Speed ◽  
Disturbance Observer ◽  
Speed Control ◽  
Precision Machining ◽  
Feedback Control System ◽  
Speed Control System ◽  
Ultra Precision ◽  
Rotational Speed Control ◽  
The Mathematical Model

In ultra-precision machining to produce various precision products such as lenses or mirrors, the single-point diamond cutting is mainly carried out to achieve the high accuracy and high quality machined surfaces. Thus, the precise rotation accuracy is required to the spindle of the ultra-precision machining tool. The water driven spindle had been developed for the precision machining tool spindle. This spindle is driven by the torque of water flow power. Then, the rotational speed can be controlled by supplied flow rate of water. However, the rotational spindle speed during cutting operation is changed due to the influence of the cutting forces during the machining processes. The change in the rotational speed causes the change in the cutting speed, as a result, it degrades the machined surface quality as well. In order to reveal and reduce the influence of this phenomenon, the mathematical model of the rotational speed control system for water driven spindle was derived. This rotational speed control system consists of the water driven spindle and the flow control valve. From the simulation results using a derived transfer function of the rotational speed control system, it is clarified that the rotational speed changes depending on the external load torque. Then, based on the mathematical model, the feedback rotational speed control system with a conventional P-I controller is designed. The effectiveness of the proposed feedback control system is verified by the turning tests. Furthermore, a disturbance observer to minimize the influence of cutting forces on the rotational speed was added to the feedback control system. As a result, this paper shows the performance of the rotational speed control system.

Influence of Rotational Speed on Thermal Performance of Tri-Sector Rotary Regenerative Air Preheater

2016 ◽  
Author(s):  
Xun Chen ◽  
Xue-nong Duan ◽  
Li-min Wang ◽  
Yi Yang ◽  
Dun-dun Wang ◽  
...  
Keyword(s):  
Finite Difference ◽  
Finite Difference Method ◽  
Difference Method ◽  
Rotational Speed ◽  
The Other ◽  
Heating Period ◽  
Height Range ◽  
Rotational Angle ◽  
Air Preheater ◽  
Deposition Area

This paper provides a detailed analysis of how a rotary regenerative air preheater’s performance parameters such as effectiveness, fluid and metal temperature fields, and ammonium bisulfate (ABS) deposition area vary with rotor rotational speed. A tri-sector rotary regenerative air preheater for a 600MW unit was studied as an example by use of effectiveness–modified number of transfer units (ε-NTU0) method and a finite difference method. The findings of the research are as follows: (1) There is a nonlinear relationship between matrix temperature distribution and rotational angle, and the degree of nonlinearity, represented by unsteady heat transfer correction factor Π, increases with decreasing rotational speed and varies between sectors; (2) There exist two equilibrium positions around the intersection points of matrix temperature curves for different rotational speeds, one occurring in the heating period and the other in the cooling period; (3) The act of reducing the rotor speed has two effects on ABS deposition. On the one hand, the height range of possible ABS deposition area will expand as the matrix temperature within the first third of gas sector’s angle range further decreases with decreasing rotational speed. On the other hand, after the rotational speed falls below a certain level, the hot-end matrix temperature climbs above the ABS formation temperature during part of the heating period, resulting in gasification and decomposition of the condensed product. The combined effect is yet to be examined through further theoretical and empirical analyses. (4) The trends of average outlet temperatures of primary and secondary air depend on rotor rotation direction and angles of sectors. (5) The effectiveness values calculated by ε-NTU0 method are greater than those acquired by the finite difference method, especially at low rotor rotational speeds.

Selection of control parameters in a control system with a DC electric series motor using evolutionary algorithm

2011 ◽  
Vol 60 (3) ◽  
pp. 231-237 ◽  
Author(s):  
Wiktor Hudy ◽  
Kazimierz Jaracz
Keyword(s):  
Control System ◽  
Evolutionary Algorithms ◽  
Evolutionary Algorithm ◽  
Rotational Speed ◽  
Pi Controller ◽  
Step Change ◽  
Control Parameters ◽  
Hysteresis Controller ◽  
Object Of Control ◽  
Selection Of

Selection of control parameters in a control system with a DC electric series motor using evolutionary algorithm This paper presents a method of selection of regulator parameters in a control system using evolutionary algorithm. The control system has one PI controller and one hysteresis controller. The value of the proportional band and the value of the Integral time were defined by evolutionary algorithms. The object of control was a Brown Boveri GS10A motor. The task functions were the step change of rotational speed and step change of the motor's torque. The control system with the parameters selected by means of the evolutionary method was verified by using MATLAB/Simulink environment.

scholarly journals DESIGN AND EVALUATION OF A CONTROLLER TO ACHIEVE OPTIMUM SEEDING RATE WITH SPECIFIC SPATIAL MANAGEMENT IN AGRICULTURAL MACHINERY

2019 ◽  
Vol XLII-4/W18 ◽  
pp. 917-921
Author(s):  
A. Saberi ◽  
E. Khesali ◽  
M. Fakhri ◽  
H. Enayati ◽  
M. Koushapoor
Keyword(s):  
Control System ◽  
Precision Agriculture ◽  
Rotational Speed ◽  
Gear Ratio ◽  
Modern Technology ◽  
Variable Rate ◽  
Seeding Rate ◽  
Fixed Rate ◽  
Positioning Systems ◽  
Spatial Management

Abstract. Achieving optimal seeding rates in different areas of the field is very important for maximizing crop yield. Nowadays, spatial management of croplands as a modern technology has been recommended in precision agriculture systems. Agricultural inputs such as seed, fertilizers, herbicides, etc., should be optimized with field conditions in different areas. For example, fertilizing and moisture should being compatible. Due to changes in these two factors, optimum seeding rates might being different in a field; areas with higher fertility or higher soil moisture have the higher seed rates. An applicable method to reach the ability of variable seeding rates in agricultural machines is to add controllers to the conventional fixed seeding rate seed drills. In the spatial management technology for seeding in a variable rate, first, the map of required seed for seeding practice is prepared for each particle of the field and then loaded in the machine at GIS format. The controller controls the seed rate continuously using the GIS map and the spatial position of the machine at field is provided by positioning systems. The aim of this study was to select the best closed-loop variable rate control system for Hassia seed drill shifting from a fixed rate to variable rate. To this end, Assessment of the performance of a control system that mounted on the seed dill and vary the rotational speed of the seed metering drive shaft performed. The control system was included a 250-watt DC engine, gearbox with constant gear ratio, two encoders (first for sensing the seed drill speed and second for sensing the rotational speed of the engine), position receiver and navigation, DC engine controller, and a portable computer for collecting data. The response time for transmitting seeding rate by the controller was determined from low to high 4/7 seconds and from high to low 2/5 seconds.

scholarly journals Control Performance Improvement of Hydro-Viscous Clutch Based on Fuzzy-PID Controller

Energies ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 8282
Author(s):  
Xiangping Liao ◽  
Shuai Yang ◽  
Dong Hu ◽  
Guofang Gong ◽  
Xiongbin Peng
Keyword(s):  
Control System ◽  
Pid Control ◽  
Rotational Speed ◽  
Pid Controller ◽  
Water Pressure ◽  
Fuzzy Pid ◽  
Fuzzy Pid Control ◽  
Relief Valve ◽  
Fuzzy Pid Controller ◽  
Speed Fluctuation

As a rotational speed controller, a hydro-viscous clutch (HVC) is usually used in the constant pressure water supply system to maintain the needed water pressure constant. However, when the hydro-viscous clutch is working, it often suffers from the problem of output rotational speed fluctuation since the spool of proportional relief valve can easily get stuck. Consequently, water pressure will fluctuate too. A special pump control system of HVC was proposed based on the Fuzzy-PID controller for the purpose of reducing the fluctuation rate. The MATLAB simulation was carried out according to the mathematical model and the results show that the Fuzzy-PID control strategy is superior to traditional PID control. The corresponding experiment was performed and the result indicate that through applying the Fuzzy-PID controller based pump control system, the rotational output speed fluctuation of HVC can be inhibited from ±60π to ±6π rad/min, and the water pressure fluctuation is dropped from ±0.1 to ±0.002 MPa.

Angular Position Control of Fluid-Driven Bi-Directional Motor

2010 ◽  
Vol 224 (11) ◽  
pp. 2350-2362 ◽  
Author(s):  
Y Nakao ◽  
M Ishikawa
Keyword(s):  
Control System ◽  
Rotational Speed ◽  
Disturbance Observer ◽  
Position Control ◽  
Angular Position ◽  
Speed Control ◽  
Load Torque ◽  
Speed Control System ◽  
Rotational Speed Control ◽  
Position Control System

This paper describes the design of a rotational speed-control system and an angular position-control system for a fluid-driven bi-directional motor. The fluid-driven bi-directional motor has a driving principle similar to that of the fluid-driven spindle, which is designed for use in ultra-precision machine tools. The fluid-driven bi-directional motor was designed so that it is driven by low viscosity oil flow power. In this paper, the rotational speed controller for the motor is first discussed. In order to reduce the influence of external load torque on the rotational speed, a conventional disturbance observer is combined with the rotational speed-control system. The angular position-control system, which possesses the rotational speed feedback loop with the disturbance observer in the angular position feedback loop, is then discussed. The designed rotational speed and angular position-control systems are conventional I—P control and proportional control systems, respectively. The performance of the designed rotational speed-control system and the angular position-control system is studied via simulations and experiments. The performance of the designed control system is tested by the step response method as well as by the frequency response method, respectively. The simulation and experimental results show that the rotational speed and the angular position of the motor can be controlled by the rotational speed controller and angular position controller, respectively. In addition, the influence of the external load torque acting on the motor is successfully compensated for by means of the disturbance observer. The experimental result shows that the designed angular position-control system suppresses the steady-state positioning error to less than 0.02°, even if external constant load torque acts on the motor.

Study on the Influence of Gear Rattling on Pitting Fatigue Failure

2014 ◽  
Vol 496-500 ◽  
pp. 634-641
Author(s):  
Gang Shen ◽  
Dong Xiang ◽  
Ning Xie ◽  
Peng Mou ◽  
Wei Yang ◽  
...  
Keyword(s):  
Fatigue Failure ◽  
Contact Stress ◽  
Rotational Speed ◽  
Failure Modes ◽  
Tooth Surface ◽  
Test Bed ◽  
Surface Mapping ◽  
Speed Difference ◽  
Speed Test ◽  
Driving Wheel

The pitting fatigue failure is one of the main gear failure modes, and it has extremely important significance in studying on the influence of dynamic characteristics on pitting fatigue failure. The article has set up increasing-speed test-bed, using photoelectric encoder and NI DAS to measure and collect rotational-speed pulse of driving wheel and driven wheel. Arc-length difference and rotational-speed difference of driving wheel and driven wheel are analyzed to verify gear rattling phenomenon under increasing-speed transmission. And then gear surfaces under certain cycles are observed and analyzed utilizing surface mapping microscope to explore the influence of gear rattling on pitting fatigue failure under increasing-speed transmission. It is shown that there is rotational-speed difference between driving wheel and driven wheel, which indicates that gear rattling phenomenon appears in the meshing process, or more precisely, gear rattling phenomenon appears on both surfaces of the tooth because rotational-speed difference fluctuates bilaterally. In addition, tooth surface contact stress is 221.3Mpa, in theory, if actual contact stress is less than fatigue limit, pitting fatigue failure should not occur. However, through gear surface observation, pitting phenomenon authentically appears with the tendency from micro pitting to destructive pitting. In a word, gear pitting fatigue failure is induced by gear rattling to a certain extent.

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