scholarly journals An Adaptive Roller Speed Control Method Based on Monitoring Value of Real-Time Seed Flow Rate for Flute-Roller Type Seed-Metering Device

Sensors ◽  
2020 ◽  
Vol 21 (1) ◽  
pp. 80
Author(s):  
Wei Liu ◽  
Jianping Hu ◽  
Xingsheng Zhao ◽  
Mengjiao Yao ◽  
Imran Ali Lakhiar ◽  
...  
Keyword(s):  
Uniform Distribution ◽  
Real Time ◽  
Flow Rate ◽  
Crop Yields ◽  
Control Method ◽  
Speed Control ◽  
Seeding Rate ◽  
Roller Speed ◽  
Working Length ◽  
Rate Sensor

In order to obtain desirable crop yields, grain seeds need to be sown at the optimal seed amount per hectare with uniform distribution in the field. In previous grain sowing processes, the seeding rates are controlled by the rotational speed of the flute roller which significantly effects the uniform distribution of the seeds due to disturbances, such as the reduction of the seeds’ mass in the hopper and the change of working length of the flute roller. In order to overcome the above problem, we developed an adaptive roller speed control system based on the seed flow rate sensor. The developed system can monitor and feedback actual seeding rates. In addition, based on the monitoring value of the real-time seeding rates, an adaptive roller speed control method (ARSCM), which contains an algorithm for calculating the seeding rate with a compensation, was proposed. Besides, the seeding performance of the ARSCM and that of the conventional roller speed control method (CRSCM) were compared. The results of constant-velocity experiments demonstrated that the accuracy (SA) and the coefficient of variation (SCV) of the seeding rates controlled by the ARSCM were 94.12% and 6.77%, respectively. As for the CRSCM, the SA and SCV were 89.00% and 8.95%, respectively. Under variable-velocity conditions, the SA and SCV of the proposed system were 91.58% and 11.08%, respectively, while those of the CRSCM were 88.48% and 13.08%, respectively. Based on the above results, this study concluded that the ARSCM is able to replace the CRSCM in practical sowing processes for the optimal and uniform seed distribution in the field.

scholarly journals Dynamical Modeling of Frequency Controlled Variable Speed Parallel Multistage Centrifugal Pumps

2015 ◽  
Vol 62 (3) ◽  
pp. 347-362 ◽  
Author(s):  
Farid Khayatzadeh ◽  
Jafar Ghafouri
Keyword(s):  
Flow Rate ◽  
Control Strategy ◽  
Control Method ◽  
Speed Control ◽  
Constant Speed ◽  
Variable Step Size ◽  
Variable Speed ◽  
Centrifugal Pumps ◽  
Step Size ◽  
Pumping System

Abstract This paper presents a development of a model of a set of multistage centrifugal electro pumps including two 4 stage stainless steel centrifugal pumps, each coupled to a 4 kW three-phase induction motor, connected to a hydraulic application running under two control strategies including constant speed and variable speed methods. Each pump provides 16 m3/hr flow rate and 58mwater head at BEP (Best Efficiency Point). Dynamicity of the model causes variations in all operational parameters of pumping system in any variation on consuming flow rate. Each electro pump has been driven with a variable frequency drive utilizing frequency control method for adjusting the rotational speed under a PID control regarding to match of pumping system operational point with the consumption point to save the energy. 83% energy saving is achieved by model in variable speed control strategy comparing to constant speed control strategy. MATLAB/SIMULINK software using ode45 solver and variable step size simulates this model.

Implementation Study about the Software CNC System Based on Windows

2011 ◽  
Vol 411 ◽  
pp. 264-268 ◽  
Author(s):  
Li Qun Lei ◽  
Kun Qi Wang ◽  
Ju Han
Keyword(s):  
Real Time ◽  
Data Transfer ◽  
Control Method ◽  
Speed Control ◽  
Interpolation Operator ◽  
Implementation Study ◽  
Determination Method ◽  
Cnc System ◽  
Real Time Control ◽  
Time Control

Real-time control method about all software CNC based on Windows was proposed in the paper, and the data transfer methods were given. The determination method of clock interrupt about software CNC and the enhancement of the interrupt level were given in the paper to meet the needs of the speed control and the interpolation operator. The resolves showed that the speed of the whole software CNC was significantly improved.

scholarly journals Implementation of a V/f Controlled Variable Speed Induction Motor Drive

2020 ◽  
Vol 8 (1) ◽  
pp. 35-48
Author(s):  
Zeynep Bala Duranay ◽  
Hanifi Guldemir ◽  
Servet Tuncer
Keyword(s):  
Real Time ◽  
Induction Motor ◽  
Control Method ◽  
Experimental System ◽  
Speed Control ◽  
Motor Drive ◽  
Induction Motor Drive ◽  
Three Phase ◽  
Controller Board

DSP implementation of speed control of three phase induction motor drive is presented in this paper. A closed loop speed control has been achieved using constant V/f technique which is a simple scalar control method used to control the magnitude of the control quantities. In this study, a fourth order polynomial drived from V/f curve is constructed instead of using look up table which takes much time for determination of voltage from frequency value. A PI controller is used in speed control.  dSPACE DS-1103 controller board is used for the implementation with Matlab/Simulink, which has a simple real time interface. Steady-state speed characteristics and transient responses with various reference speed commands are presented by experimental system.  The simulation and experimental results provide a smooth speed response and good performance under various dynamic operations. Real time speed control has been implemented and some results are presented.

Real Time Implementation of Speed Control of PMLSM with Space Vector Pulse Width Modulation using dSPACE

2013 ◽  
Vol 7 (2) ◽  
pp. 19-25
Author(s):  
B. Arundhati ◽  
◽  
K. Alice Mary ◽  
Surya Kalavathi M ◽  
K. Shankar ◽  
...  
Keyword(s):  
Real Time ◽  
Pulse Width ◽  
Pulse Width Modulation ◽  
Speed Control ◽  
Space Vector

scholarly journals Extended Permanent Magnet Synchronous Motors Speed Range Based on the Active and Reactive Power Control of Inverters

Energies ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3549
Author(s):  
Pham Quoc Khanh ◽  
Viet-Anh Truong ◽  
Ho Pham Huy Anh
Keyword(s):  
Power Control ◽  
Permanent Magnet ◽  
Reactive Power ◽  
Control Method ◽  
Speed Control ◽  
Torque Ripple ◽  
Current Control ◽  
Permanent Magnet Synchronous Motors ◽  
Synchronous Motors ◽  
Speed Range

The paper proposes a new speed control method to improve control quality and expand the Permanent Magnet Synchronous Motors speed range. The Permanent Magnet Synchronous Motors (PMSM) speed range enlarging is based on the newly proposed power control principle between two voltage sources instead of winding current control as the conventional Field Oriented Control method. The power management between the inverter and PMSM motor allows the Flux-Weakening obstacle to be overcome entirely, leading to a significant extension of the motor speed to a constant power range. Based on motor power control, a new control method is proposed and allows for efficiently reducing current and torque ripple caused by the imbalance between the power supply of the inverter and the power required through the desired stator current. The proposed method permits for not only an enhanced PMSM speed range, but also a robust stability in PMSM speed control. The simulation results have demonstrated the efficiency and stability of the proposed control method.

scholarly journals Centrifugal Compressor Stall Control by the Application of Engineered Surface Roughness on Diffuser Shroud Using Numerical Simulations

Materials ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 2033
Author(s):  
Amjid Khan ◽  
Muhammad Irfan ◽  
Usama Muhammad Niazi ◽  
Imran Shah ◽  
Stanislaw Legutko ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Mass Flow Rate ◽  
Mass Flow ◽  
Flow Rate ◽  
Centrifugal Compressor ◽  
Control Method ◽  
Flow Instability ◽  
Passive Flow Control ◽  
Passive Flow ◽  
Low Mass

Downsizing in engine size is pushing the automotive industry to operate compressors at low mass flow rate. However, the operation of turbocharger centrifugal compressor at low mass flow rate leads to fluid flow instabilities such as stall. To reduce flow instability, surface roughness is employed as a passive flow control method. This paper evaluates the effect of surface roughness on a turbocharger centrifugal compressor performance. A realistic validation of SRV2-O compressor stage designed and developed by German Aerospace Center (DLR) is achieved from comparison with the experimental data. In the first part, numerical simulations have been performed from stall to choke to study the overall performance variation at design conditions: 2.55 kg/s mass flow rate and rotational speed of 50,000 rpm. In second part, surface roughness of magnitude range 0–200 μm has been applied on the diffuser shroud to control flow instability. It was found that completely rough regime showed effective quantitative results in controlling stall phenomena, which results in increases of operating range from 16% to 18% and stall margin from 5.62% to 7.98%. Surface roughness as a passive flow control method to reduce flow instability in the diffuser section is the novelty of this research. Keeping in view the effects of surface roughness, it will help the turbocharger manufacturers to reduce the flow instabilities in the compressor with ease and improve the overall performance.

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