Research on Desert Soil Moisture Measure & Control System

2012 ◽  
Vol 220-223 ◽  
pp. 1482-1486
Author(s):  
Shi Wei Li ◽  
Shuai Bing Li ◽  
Hai Ying Dong
Keyword(s):  
Soil Moisture ◽  
Control Method ◽  
Simulation Analysis ◽  
Dynamic Performance ◽  
Desert Soil ◽  
Moisture Sensor ◽  
Frequency Domain Reflectometry ◽  
Threshold Switch ◽  
Adaptive Pid Control ◽  
And Control

For the purpose of meeting the desert soil moisture easurements and control requirements accurately, a soli moisture control model is set in this paper. As the system is of delay and nonlinear characteristics, we used a frequency domain reflectometry (FDR) principle moisture sensor to measure the desert soil in tratification and a threshold switch fuzzy adaptive PID control method is taken in order to get a highly dynamic performance. Additionally, We made an experiment and a simulation analysis, The results show that the measure and control method we used not only has a strong robustness, but also can quickly and accurately detect and control the sand pit soil moisture.

Development of a Ring Permeability Test System

2010 ◽  
Vol 136 ◽  
pp. 153-157
Author(s):  
Yu Hong Du ◽  
Xiu Ming Jiang ◽  
Xiu Ren Li
Keyword(s):  
Control System ◽  
Control Method ◽  
Dynamic Performance ◽  
Experimental Tests ◽  
Measuring Method ◽  
Test System ◽  
Fluid Theory ◽  
And Control ◽  
Relationship Of ◽  
The Mathematical Model

To solve the problem of detecting the permeability of the textile machinery, a dedicated test system has been developed based on the pressure difference measuring method. The established system has a number of advantages including simple, fast and accurate. The mathematical model of influencing factors for permeability is derived based on fluid theory, and the relationship of these parameters is achieved. Further investigations are directed towards the inherent characteristics of the control system. Based on the established model and measuring features, an information fusion based clustering control system is proposed to implement the measurement. Using this mechanical structure, a PID control system and a cluster control system have been developed. Simulation and experimental tests are carried out to examine the performance of the established system. It is noted that the clustering method has a high dynamic performance and control accuracy. This cluster fusion control method has been successfully utilized in powder metallurgy collar permeability testing.

On an ambulance stretcher suspension concerned with the reduction of patient's blood pressure variation

1997 ◽  
Vol 211 (2) ◽  
pp. 199-208 ◽  
Author(s):  
K Sagawa ◽  
H Inooka ◽  
E Ino-oka ◽  
T Takahashi
Keyword(s):  
Blood Pressure ◽  
Design Process ◽  
Control Method ◽  
Simulation Analysis ◽  
Pressure Variation ◽  
Continuous Control ◽  
Tilting Angle ◽  
Blood Pressure Variation ◽  
Safe Transport ◽  
And Control

The design process and control of an ambulance stretcher suspension to reduce patient's blood pressure variation (BPV) is discussed. The BPV caused by applying the vehicle brakes may lead to deterioration of a patient's condition. The proposed method can reduce BPV by tilting the stretcher and counterbalancing back-to-front acceleration of the ambulance with gravity. The experimental results obtained when using a manually controlled stretcher confirm that BPV is reduced by tilting the stretcher. A continuous control method that varies the tilting angle is investigated through simulation analysis. The results show that this control method reduces the BPV effectively and achieves safe transport of the patient.

Multi-Objective Robust Decentralized Control for the Interconnected Fuzzy Singularly Perturbed Models

2012 ◽  
Vol 182-183 ◽  
pp. 1200-1205
Author(s):  
Ye Nan Hu ◽  
Fu Chun Sun
Keyword(s):  
Decentralized Control ◽  
Closed Loop ◽  
Control Method ◽  
Dynamic Performance ◽  
Singularly Perturbed ◽  
Disturbance Attenuation ◽  
Closed Loop System ◽  
Multi Objective ◽  
Robust Decentralized Control ◽  
And Control

A multi-objective robust decentralized control method is proposed for the interconnected fuzzy singularly perturbed models. Such decentralized controller can guarantee the whole closed-loop system is asymptotically stable even when the multi-time-scale subsystems are interactional. Besides, the disturbance attenuation performance, dynamic performance and control amplitude can be optimized synthetically. The simulations illustrate the effectiveness of the proposed method.

Modeling and Control Simulation for the Multi-Range Hydro-Mechanical CVT

2014 ◽  
Vol 621 ◽  
pp. 462-469 ◽  
Author(s):  
Ming Zhu Zhang ◽  
Zhi Li Zhou
Keyword(s):  
Control System ◽  
Dynamic Characteristic ◽  
Control Method ◽  
Dynamic Performance ◽  
Range Shift ◽  
Transmission Ratio ◽  
Modeling And Control ◽  
Finite State ◽  
Displacement Pump ◽  
And Control

To develop the control system of multi-range hydro-mechanical continuously variable transmission (HMCVT), a model of a multi-range HMCVT is built using the principle of dynamics. According to the characteristic of power split, HMCVT is separated as axes set, variable displacement pump-motor system, clutch set. With wheel tractor as application instance, the whole model of vehicle power train is made, which includes the engine, HMCVT, running system and control system. Based on the theory of Finite State Machine, an automatic control method of speed change and range shift is present, which employs the throttle value, engine speed, range number and transmission ratio as the control parameters. The dynamic characteristic of automatic speed changing and ranges shifting is simulated. The result indicates that the model can correctly represent the dynamic characteristic of HMCVT, the engine can run at the optimal working point, the multi-range HMCVT can shift range steadily and change transmission ratio continuously when the load changes, the circularly shift range is avoided. The model can be used conveniently for the analysis of vehicle dynamic performance and the research of multi-range HMCVT control method.

scholarly journals The Research on the Mobile Drilling Rig for Deep Seabed Shallow Strata

2020 ◽  
Author(s):  
Ziqiang Ren ◽  
Feng Zhou ◽  
Hai Zhu ◽  
Peihao Zhang ◽  
Jiawang Chen ◽  
...  
Keyword(s):  
Control Method ◽  
Simulation Analysis ◽  
Mineral Resources ◽  
Propulsion System ◽  
Solid Core ◽  
Drilling Rig ◽  
Simulation Efficiency ◽  
Operation Process ◽  
Shallow Strata ◽  
And Control

At present, the drilling rig for deep seabed shallow strata is widely used in the exploration of ocean cobalt-rich crust resources and other fields, which not only can obtain solid core samples at a specific station, but the operation process is relatively safe. This paper mainly presents the structure and mechanism of mobile drilling rig in acquiring the seafloor cores (up to 1.5 m long). Based on the function of the AMESim software, the hydraulic propulsion system model of mobile drilling rig is established, which is the basis and core part of the mobile drilling rig. Moreover, the control methods of closed-loop and PID are respectively used to control the hydraulic propulsion system for simulation analysis. Through the comparison of simulation results, it is found that the PID control method is more convincing in verifying the design rationality of hydraulic propulsion system. In the simulation of the PID-controlled hydraulic propulsion system, the co-simulation technology of AMESim and Matlab/Simulink not only establishes the hydraulic model and control model, but also determines the relevant simulation parameters, which is helpful to improve the system simulation efficiency. In its verification deployment in the South China Sea, the mobile drilling rig has been operated for many times at different depths, and some cores have been successfully obtained. Furthermore, the mobile drilling rig has been used during the 55th Voyage of China Oceanic Scientific Expedition supported by China Ocean Mineral Resources R&D Association. Several sites were explored and a large number of cobalt-rich crust cores were obtained. The powerful theory and sea trails are provided to support for the further research on survey of the abyssal resource.

Study on Fuzzy Multiple Reference Model Adaptive Control Strategies

2014 ◽  
Vol 962-965 ◽  
pp. 2932-2938
Author(s):  
Shu Xing Peng ◽  
Hua Xue ◽  
Dong Dong Li
Keyword(s):  
Adaptive Control ◽  
Control Method ◽  
Reference Model ◽  
Control Strategies ◽  
Dynamic Performance ◽  
Control Precision ◽  
High Dynamic ◽  
Suitable Reference ◽  
And Control ◽  
Multiple Reference

A new fuzzy multiple reference model adaptive control method combined with fuzzy select and conventional adaptive control is presented. To overcome the control difficulties which due to significant and unpredictable system parameter variations, fuzzy logic rules are designed to choose the suitable reference model. The new method is applied to control the speed servo system of dynamic model of BLDCM, and the simulation results show it works well with high dynamic performance and control precision under the condition of great change in reference speed and load torque.

Modeling and control of a torque load system with servo actuator's dynamics

2016 ◽  
Vol 231 (9) ◽  
pp. 1676-1685 ◽  
Author(s):  
Xin Wang
Keyword(s):  
Control Method ◽  
Dynamic Performance ◽  
Torque Control ◽  
Control Surface ◽  
Phase Lag ◽  
Load Torque ◽  
Modeling And Control ◽  
Torque Load ◽  
Actuation Systems ◽  
And Control

In this work, the models and control strategy of the Electric Servo-torque System(ESS) which is used as an experiment rig for conducting dynamic performance and stability tests of aerial vehicle control surface actuation systems are presented. The detailed dynamics of the load motor and loaded flight actuator’s rotating movement in the ESS are analyzed, leading to an integrated load torque synchronization system. The kinematic dynamics of the loaded control surface driving actuator is an important consideration to estimate the trend of torque variation and to improve the performance of the load system. The load control method is expressed in terms of a multi-loop torque control law, which uses feedback and feedforward loops to meet system design requirements. Numerical examples together with experimental results are included to illustrate the effectiveness of the proposed models and control parameters. This brief addressed a specific utilization of the loaded actuator’s dynamics, revealing that it can reduce both the phase lag and the amplitude gain of the load torque in the Electric Servo-torque System.

scholarly journals Smart Farming for Lowland Strawberry (Fragaria x ananassa) Production

2021 ◽  
Vol 12 (3) ◽  
pp. 1797-1804
Author(s):  
Jayson J. Elenzano Et.al
Keyword(s):  
Soil Moisture ◽  
Moisture Content ◽  
Moisture Sensor ◽  
Smart Farming ◽  
Temperature And Humidity ◽  
The Status ◽  
Temperature Parameter ◽  
Arduino Microcontroller ◽  
And Control ◽  
Parameter Values

The developed system monitors the humidity levels, moisture content of the soil and surrounding temperature. Parameter values such as maximum and minimum temperature, maximum and minimum humidity values can be monitored accordingly by sending an sms to the system using arduino microcontroller, gsm module, moisture sensor and dht11 temperature/humidity sensor. This design maybe used for monitoring and controlling temperature and humidity value via sms. This system monitors and control the water content of the soil using a moisture sensor which runs under the control of a microcontroller, a dht 11 sensor to control and monitor the greenhouse humidity and proper temperature and a short messaging system (sms) to notify the caretaker/ owner on the moisture level content and temperature/humidity of the greenhouse. The system monitored and maintains the proper temperature, humidity and soil moisture content inside the greenhouse. The device has been successfully tested under simulated conditions and showed the ability of controlling temperature, humidity and soil moisture. The system notified the caretaker/farmer via short messaging system (sms) for the notification status (information) and triggering the water pump. The device showed the capability of sending sms holding the latest temperature and humidity information and also the status of the greenhouse.

Analysis and Research on Mobile Drilling Rig for Deep Seabed Shallow Strata

2021 ◽  
Vol 55 (2) ◽  
pp. 81-93
Author(s):  
Ziqiang Ren ◽  
Feng Zhou ◽  
Hai Zhu ◽  
Peihao Zhang ◽  
Jiawang Chen ◽  
...  
Keyword(s):  
Control Method ◽  
Simulation Analysis ◽  
Mineral Resources ◽  
Propulsion System ◽  
Drilling Rig ◽  
Simulation Efficiency ◽  
Shallow Strata ◽  
Drilling Rigs ◽  
Differential Control ◽  
And Control

Abstract Drilling rigs for deep seabed shallow strata are commonly used to explore ocean cobalt-rich crust resources and other fields. This paper mainly presents the structure and mechanism of a mobile drilling rig for use in acquiring seafloor cores that are up to 1.5 m in length. The software Simcenter Amesim is used to establish the mobile drilling rig's hydraulic propulsion system model, which is the basis and a core part of the rig. Moreover, closed-loop and PID (proportion-integral-differential) control methods are separately used to control the hydraulic propulsion system for simulation analysis. Comparison of the simulation results shows that the PID control method is more convincing in verifying the design rationality of the hydraulic propulsion system. In the simulation of the PID-controlled hydraulic propulsion system, the co-simulation technology of Simcenter Amesim and MATLAB/Simulink not only establishes the hydraulic and control models but also determines the relevant simulation parameters, thereby helping improve system simulation efficiency. In its verification deployment in the South China Sea, the mobile drilling rig has been operated many times at different depths, and some cores have been successfully obtained. It was also used during the 55th Voyage of China Oceanic Scientific Expedition, which was supported by the China Ocean Mineral Resources R&D Association. Several sites were explored, and a large number of cobalt-rich crust cores were obtained. Theory and sea trials are explained to support further research on the survey of abyssal resources.

An Analysis of the Effects on Calibration Parameters of FDR for Moisture Sensor Caused by Different Kinds of Soils

2013 ◽  
Vol 401-403 ◽  
pp. 968-973
Author(s):  
Hai Bo Chen ◽  
Lin Mao Ye ◽  
Li Kui Shi
Keyword(s):  
Soil Moisture ◽  
Sandy Soil ◽  
Experimental Result ◽  
Sensor Calibration ◽  
Soil Columns ◽  
Moisture Sensor ◽  
Soil Moisture Sensor ◽  
Calibration Experiment ◽  
Frequency Domain Reflectometry ◽  
Calibration Parameters

With the method of artificial soil columns, several kinds of soil, such as, loam, clay, and sandy soil were used for FDR (frequency domain reflectometry) moisture sensor calibration experiment. Then, these data showed that the frequency of soil moisture sensor is monotone decreasing with the increase of soil volumetric water content, so the correlation is obvious. Different kinds of soil affected moisture sensor parameter remarkably. A better result would be obtained in classification calibration than that in concentration calibration. This experimental result had a great meaning for fine calibration of soil water automatic detector in the areas with complex kinds of soil.

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