Development of a Test Stand to Quantify the Response of a Planter’s Automatic Downforce Control System

2021 ◽  
Vol 64 (5) ◽  
pp. 1533-1543
Author(s):  
Ryan Strasser ◽  
Sylvester A. Badua ◽  
Ajay Sharda ◽  
Matthias Rothmund
Keyword(s):  
Control System ◽  
Test Stand ◽  
Ride Quality ◽  
System Response ◽  
List Type ◽  
Wheel Load ◽  
Ride Height ◽  
Load Variations ◽  
System Response Time ◽  
Actual Field

HighlightsThe developed downforce test stand simulated varying disc loads based on actual field data.The planter’s downforce control system was able to maintain the target gauge wheel load 94% of the time.The planter’s downforce control system managed disc load variations of up to 667 N within 1.3 s.Abstract. In recent years, precision planters have incorporated automatic control of the row unit downforce to reduce sidewall soil compaction, maintain proper seeding depth, and control row unit ride quality. By applying an appropriate row unit downforce, more uniform emergence and increased yield can be obtained. However, little research exists on evaluating the response and accuracy of downforce control systems during planting. Therefore, the objectives of this study were to (1) develop a laboratory-scale row unit downforce test stand and (2) use the test stand to evaluate the downforce control system response time and the load distribution between the gauge wheels, opening discs, and closing wheels using simulation scenarios based on real-world soil and terrain data. The downforce test stand was able to distribute the applied downforce to the row unit gauge wheels, opening discs, and closing wheels. It was also capable of varying the row unit ride height. The simulation scenarios using the test stand showed that the downforce control system maintained the target gauge wheel load (GWL) of 379 N within ±223 N for more than 94% of the time during all simulations. The downforce control system was also able to manage the GWL within 1.3 s for disc load variations up to 667 N. Keywords: Automatic downforce control, Downforce test stand, Gauge wheel load, Simulation.

scholarly journals Ship’s course stabilization accuracy improvement by implementing dual-loop control system

2019 ◽  
Vol XXII (2) ◽  
pp. 94-100
Author(s):  
Volyanskaya Y.
Keyword(s):  
Control System ◽  
Positive Feedback ◽  
Block Diagram ◽  
System Response ◽  
Accuracy Improvement ◽  
Loop Control ◽  
Simulink Model ◽  
Modelling Analysis ◽  
System Response Time ◽  
Loop Control System

This study addresses the problem of ship’s course stabilization accuracy improvement in order to reduce trip distance and fuel consumption. The method is to upgrade autopilot control diagram. Proposed block diagram of a dual-loop control system allows to estimate the effects of disturbances and form the positive feedback transfer function. Dual-loop course control system Matlab/Simulink model was developed in the paper. Mathematical modelling analysis shown the effectiveness of such system in course accuracy improvement by compensating of wind-wave disturbances. In addition, proposed system operation modelling analysis demonstrated ship’s course keeping system response time improvement with the use of estimated disturbance positive feedback loop.

Research on Performance of Control System Based on EtherCAT

2012 ◽  
Vol 588-589 ◽  
pp. 1414-1418
Author(s):  
Qing Chun Zheng ◽  
Wen Ge Wang ◽  
Xiao Wen Wan
Keyword(s):  
Control System ◽  
Response Time ◽  
Real Time ◽  
Cycle Time ◽  
High Speed ◽  
Speed Control ◽  
Frame Structure ◽  
System Response ◽  
Time Data ◽  
System Response Time

Aiming at the increasing demand of performance for industrial control, the industrial real-time Ethernet control system for high-speed control based on EtherCAT was presented. The principles and frame structure of EtherCAT were introduced. The system response time, EtherCAT cycle time and oversampling technology of achieving microsecond-order sampling were analyzed. By designing the experimental platform based on EtherCAT, The system response time, EtherCAT cycle time and oversampling performance were tested. Theoretical analysis and experimental test results show that the System can achieve millisecond-order response time and microsecond-order oversampling cycle time. Therefore, Industrial Ethernet control system based on EtherCAT is very suitable for high-speed control and real-time data acquisition.

Research on Control Strategy of Underground Drainage System

2014 ◽  
Vol 971-973 ◽  
pp. 1325-1329
Author(s):  
Li Zhang ◽  
Ming Zhou ◽  
Li Gui Kang ◽  
Dai Chen ◽  
Xiao Lv
Keyword(s):  
Control System ◽  
Water Level ◽  
Drainage System ◽  
System Response ◽  
Level Control ◽  
Tight Coupling ◽  
Control Rules ◽  
System Response Time ◽  
The Stability ◽  
Stability Of Water

To the question of the water level control of the underground drainage control system such as multi variables, tight coupling, nonlinear, and it was difficult to modulate precisely, the subsection control based on predictive model strategy of the pumps was proposed. The control rules were determined by analyzing the error which contain the predicted value for ensuring the stability of water level. Simulation shows that the algorithm is feasible, control system response time shortened, over regulation measurement greatly reduced, fluctuation time decreased and control system has strong adaptability and good stability.

On the Vibration of a Translating String Coupled to Hydrodynamic Bearings

1990 ◽  
Vol 112 (3) ◽  
pp. 337-345 ◽  
Author(s):  
C. A. Tan ◽  
B. Yang ◽  
C. D. Mote
Keyword(s):  
Control System ◽  
Transfer Function ◽  
Spatial Location ◽  
System Response ◽  
Thickness Variation ◽  
Translation Speed ◽  
Impedance Function ◽  
Hydrodynamic Bearing ◽  
Loop Transfer Function ◽  
Bearing Force

The vibration of a translating string, controlled through hydrodynamic bearing forces, is analyzed by the transfer function method. Interactions between the string response and the bearing film are described by the bearing impedance function. This function depends on the string translation speed, the frequency of the film thickness variation, and the spatial location of the bearings. The control system consists of the translating string, bearings, actuators and sensors, and feedback elements. An integral formulation of the controlled system response is proposed that leads to the closed-loop transfer function. The frequency response of the control system is studied in the system parameter space. The feasibility of adding active control to improve the bearing force control is also considered.

scholarly journals Analysis of work load by computer system response time in different type of VDT tasks

1985 ◽  
Vol 21 (4) ◽  
pp. 211-217 ◽  
Author(s):  
Akinori KOMATSUBARA ◽  
Yoshimi YOKOMIZO ◽  
Sakae YAMAMOTO ◽  
Kageyu NORO
Keyword(s):  
Response Time ◽  
Computer System ◽  
Work Load ◽  
System Response ◽  
System Response Time

scholarly journals Performance Analysis and Optimization Techniques for Oracle Relational Databases

2019 ◽  
Vol 19 (2) ◽  
pp. 117-132
Author(s):  
Fernando Almeida ◽  
Pedro Silva ◽  
Fernando Araújo
Keyword(s):  
Execution Time ◽  
Relational Databases ◽  
Database System ◽  
Optimization Techniques ◽  
Management Systems ◽  
System Response ◽  
Database Access ◽  
Data Manipulation ◽  
System Response Time ◽  
Analyze Data

Abstract Databases provide an efficient way to store, retrieve and analyze data. Oracle relational database is one of the most popular database management systems that is widely used in a different variety of industries and businesses. Therefore, it is important to guarantee that the database access and data manipulation is optimized for reducing database system response time. This paper intends to analyze the performance and the main optimization techniques (Forall, Returning, and Bulk Collect) that can be adopted for Oracle Relational Databases. The results have shown that the adoption of Forall and Bulk Collect approaches bring significant benefits in terms of execution time. Furthermore, the growth rate of the average execution time is lower for Bulk Collect than Forall. However, adoption of Returning approach doesn’t bring significant statistical benefits.

Client-Side Relevance Feedback Approach for Image Retrieval in Mobile Environment

2013 ◽  
pp. 193-204
Author(s):  
Ning Yu ◽  
Kien A. Hua ◽  
Danzhou Liu
Keyword(s):  
Information Retrieval ◽  
Mobile Devices ◽  
Relevance Feedback ◽  
Handheld Devices ◽  
System Response ◽  
Feedback Systems ◽  
Feedback Information ◽  
Battery Power ◽  
System Response Time ◽  
Client Side

During the last decade, high quality (i.e. over 1 megapixel) built-in cameras have become standard features of handheld devices. Users can take high-resolution pictures and share with friends via the internet. At the same time, the demand of multimedia information retrieval using those pictures on mobile devices has become an urgent problem to solve, and therefore attracts attention. A relevance feedback information retrieval process includes several rounds of query refinement, which incurs exchange of images between the mobile device and the server. With limited wireless bandwidth, this process can incur substantial delay, making the system unfriendly to use. This issue is addressed by considering a Client-side Relevance Feedback (CRF) technique. In the CRF system, Relevance Feedback (RF) is done on client side along. Mobile devices’ battery power is saved from exchanging images between server and client and system response is instantaneous, which significantly enhances system usability. Furthermore, because the server is not involved in RF processing, it is able to support more users simultaneously. The experiment indicates that the system outperforms the traditional server-client relevance feedback systems on the aspects of system response time, mobile battery power saving, and retrieval result.

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