Terminal Control System Research Articles

Design and Analysis of a High-Precision Dynamic Compensation System for Seed Dropping Position in Corn Sowing Operations

In response to the problem of imprecise maintenance of plant spacing and row spacing during corn sowing operations in the middle of existing corn farms, this study designed a dynamic compensation system for corn seed dropping position. The test system includes a corn seeding machine operating unit, a seed dropping variable measurement and control system unit, a terminal control system, and a dynamic compensation system. The dynamic performance of the control system was tested experimentally. When undisturbed signals were loaded, regardless of whether the machine used the position compensation function or not, the coefficient of variation of longitudinal grain spacing was 2.6% ± 0.2%, and the longitudinal grain spacing was basically consistent. After adding disturbance signals, compared with not using the dynamic compensation function, the variation coefficient of seed spacing decreased by an average of 6.94% when using the dynamic compensation function. When using the dynamic compensation function, compared with not using dynamic compensation function, the variation coefficient of lateral grain spacing decreased by an average of 9.16%. Stability analysis of longitudinal and lateral grain spacing was conducted through bench tests, verifying the stability of the proposed dynamic compensation system for seed dropping position.

Increasing the efficiency of cargo handling at a modern warehouse terminal

Problem. The task of increasing the efficiency of cargo handling at a modern warehouse terminal is considered. The need to introduce intelligent cargo handling systems has increased due to the increased demand for supplies and the reduction of personnel in the field of logistics. When analyzing the current state of terminal transportation, it was found that the volume of transportation exceeds the capacity of the terminals. Goal. The goal is to choose a set of technical means of identification and means of cargo transportation for the management of the terminal, which will increase the efficiency and speed of cargo handling operations in the warehouse taking into account the specified criteria and restrictions. Methodology. The task of choosing a identification system is complicated by the ambiguity of various system parameters and characteristics. Their inconsistency complicates the design process. To solve this problem, the principle of system decomposition is used, in which the solution of lower-level tasks, which have their own criteria and restrictions, leads to the solution of the general design problem taking into account these limitations. The task of choosing technical means belongs to the class of multi-criteria and can be solved by methods of multi-criteria optimization of this type of objects. Results. The technology of automated design of the warehouse terminal has been developed. Models for selecting components of the logistic terminal control system have been developed. An example of the selection of the element base of the identification and transportation system according to the specified criteria and restrictions is given. Originality. The originality lies in the fact that the using intelligent components of information processing systems allow to increase warehouse terminal productivity. Practical value. Using the technology of automated design of modern warehouse terminals, a number of issues related to the accuracy, quality and speed of decision-making during cargo handling are solved.

Development and Application of Smart Home Energy Management System Based on Wireless Network Technology

In order to solve the problem of integration of home energy management system and wireless network technology, the author proposes the development and application of a smart home energy management system based on wireless network technology. Divide the NB-IoT into different simulation levels, simulate the physical layer of the NB-IoT, and according to the household energy conservation rules, calculate the household energy distribution parameters, convert the intelligent control signal into a signal constellation point, calculate the deviation value of the control command corresponding to the energy equipment, build an intelligent control simulation algorithm, and finally complete the simulation of the intelligent control system. Experimental results show the following: The simulation method in the intelligent home language input terminal control system is based on the Internet of Things, the average time of simulating the test point of energy equipment is about 4.9 s, the required simulation time is long, and in the intelligent control system of the mobile road tunnel lighting vehicle, the simulation time required by the designed simulation method is about 6.8 s, and the simulation time is the longest. The average time of the method proposed by the author to simulate the energy distribution instruction is about 3.3 s. Conclusion. The application prospect of a smart home energy management system based on wireless network technology is very broad.

Quasi-Terminal Controllers Synthesis

In the class of linear algorithms of linear stationary multi-connected plants control the subclass is distinguished of quasi-terminal algorithms with implicit aiming at the boundary conditions moving along the program of the required change of the state vector coordinates and being at a fixed interval from the current time. Aiming is realized by calculating the programs of changing the future control vector components in the form of power series segments that depend on the future time and provide a solution of the two-point boundary value problem. In idealized model conditions of the complete controllability and the availability of an accurate information about the control plant state and equations, as well as of the instantaneous and accurate implementation of the calculated commands, the quasi-terminal algorithm provides the asymptotic stability of a closed multi-connected system and as high pre-set rate of transients convergence as needed, regardless of whether the control plant model is stable. The relatively simple and easy to implement in Matlab non-optimization method of algorithm synthesis is suggested based on the use of the matrix representation of the control plant model in the state space and of the apparatus of exponential functions of matrices. Quasi-terminal algorithms can be used in multiconnected stabilization systems and, in particular, in stabilization systems of mobile terminal plants with respect to trajectories calculated by the terminal control system.

Design, implementation, and verification of a low‐cost terminal guidance system for small fixed‐wing UAVs

AbstractA terminal guidance control system for small fixed‐wing unmanned aerial vehicles (SUAV, with a wingspan of around 1.5 m) is proposed in this paper based on a visible light strap‐down seeker. The system is implemented using low‐cost, open‐source components with a cost less than $2000 and proved to be feasible, transplantable and effective for different types of SUAVs, achieving a good terminal guidance accuracy (circular error probable = 1.5 m) against a nonmaneuvering target on the ground. Impacts of low‐cost and low‐precision electrical modules mainly include influence on terminal guidance information, measurement of SUAV state values and the presented system's time‐delay. We examine the practical median flow algorithm for target tracking, the attitude pursuit guidance law for terminal guidance control and the pursuit image frame method for large delay interception to eliminate adverse effects. Furthermore, the performance and robustness are evaluated by laboratory tests as well as field flight trials on two different SUAV platforms. This paper provides a robust, effective and proven reference for the development of the aggressive SUAV for SUAV swarms.

Synthesis of a terminal control system for discrete nonlinear objects with PWM modulation

In the synthesis of optimal control actions in systems with pulse-width modulation, difficulties arise in obtaining sufficiently simple equations, the solution of which can give incorrect and unacceptable results for further use. In addition, the use of existing methods for solving such problems, even using modern computer technology, cannot guarantee obtaining acceptable results.

Design of Self-service Car Washing Machine Control System Based on ARM

With the cars in our country’s rapid increase, the limited quantity of traditional car washing shop has been unable to satisfy people’s needs. Responding to this problem the author designed a set of self-service car washing machine control system based on ARM, and a set of remote monitoring system based on 4G mobile network. The terminal control system adopted high speed, low power microcontroller LPC4350 as the control core; adopted RFID read-write module to realize IC card consumption; adopted EM770W 4G module for the washing machine terminal could connect to 4G mobile network. Through MODBUS protocol, the remote monitoring system based on KINGVIEW6.55 could communicate with the terminal system, and realized the real-time monitoring and recording the washing machines’ working parameters regularly. Because the designed system realized the unattended self-service washing, so it greatly reduced the maintenance workload, and improved the work efficiency.

Research on Intelligent Optimization of Bulk Cargo Terminal Control System

Aiming at the problems of lagging automation and low informationization of bulk cargo terminals, this paper has optimized the control system of bulk cargo terminals, and improved the characteristics and functions of the control system. Based on the completion of the existing remote start and stop processes and equipment, the database, fault diagnosis and information management of the bulk cargo terminal control system are optimized, which improves the control efficiency and operability of the control system. The transformation and upgrading of the control system has played a good role in promoting the development and construction of smart ports.

Research on SDN Flow Secure Access Control

In order to ensure the Software Defined Network (SDN) flow security access, this paper puts forward a SDN terminal access control system through the deep study on the terminal security access solution in the existing SDN. This system combines the traditional terminal access control technology with the new SDN network and mainly implements some functions such as user’s identity authentication, terminal security status assessment, user’s service authorization, QoS control, and so on. Simultaneously, the system security is analyzed in detail. The network simulation in Mininet is carried out in combination with the RYU controller secondary developed so as to complete the experiment of access control function and communication delay performance. The results show that the security access control system of SDN flow has flexible access control security strategies and then can detect the threats from the insecure terminal access in SDN. This can not only realize the identity authentication of users but also ensure the security of access terminal, and thus realizing the access authorization of terminals in different safe states.

Синтез управления маневром уклонения беспилотного летательного аппарата с учетом терминальных ограничений

Introduction. The solution to the problem of development of suboptimal evasive strategy of unmanned aerial vehicle (UAV) under the conditions of uncertainty of the current motion characteristics, and the future behavior strategy of the interdictor is considered. The FV (flying vehicle) control is organized with maximum efficiency. Herewith, the maneuvering FV trajectory must satisfy the requirements of optimality for some given functions of the phase variables at the final time and the conditions of its path through a specified terminal area space. The initial conditions and the dynamic facilities of the evading and opposing FV at the initial time are assumed to be known. The evading FV control is developed by its onboard guidance and navigation system in real time on nonlinear position feedback control. The work objective is to build an algorithm for solving the problem of synthesis of terminal optimal control of motion of center of mass of highspeed UAV that allows searching for the optimal control in function of the current coordinates of the object. Consideration of the problem in this formulation distinguishes it from the classical conflict tasks on the prosecution to be solved with the involvement of the theory of differential games, and demands computationally efficient solution methods. Materials and Methods. For the UAV operating under the conditions of violent disturbances, the most effective hard constraints on the phase variables and control are the so-called methods of optimal terminal control that implement adaptive algorithms with projection. Therefore, the solution to the formulated problem can be obtained precisely with the use of their ideology. Research Results. A new method of piecewise-software terminal control of the UAV motion is developed. It differs from the known ones in that it is based on the procedure of searching a control strategy upon the best guaranteed result with the terminal restrictions. A methodology for calculating the management strategy for the FV evasive maneuver in a slow loop of the terminal control system is worked out. It is characterized in that instead of the forecast procedure in speed-up time and calculation of residuals, the conversion of a boundary value problem to a one-point task of integration of the ordinary differential equations system with account for the occurrence of non-zero terminal member in the cost functional, is used. Discussion and Conclusions. Despite the fact that the development of a suboptimal guidance strategy in the terminal area of the evading FV is not in the form of synthesis, the control software adapts to the current conditions. This is achieved through the iterative procedures of regular recalculation of terminal conditions that are equivalent to the periodic circuit feedback. Thus, the evading FV is brought to a specified terminal area through software, while evading an interdictor is developed as synthesis. Limitations to the method are the terms that the movement model of the opposing FV is known, and it forms a natural control of the evader intercept.

Development and Experimental Study of the Online Dynamic Balance System for Grinding Machine

The vibration of grinding wheel spindle will significantly reduce the machining quality and machining accuracy of precision grinding. In order to suppress the grinding wheel rotor vibration effectively, the Spray-Typed online dynamic balance system for specific grinding wheel spindle was designed composed of terminal balance, hydraulic system and control system. To achieve the amount of spindle unbalance accurate extraction and liquid volume control, using hydraulic system to achieve the balance of the terminal of the liquid loading and using high-performance DSP chip as a control method. A segmented spindle online dynamic balance method , combining the advantages of influence coefficient method and coordinate rotation optimization method was proposed. The method can fast approaching the goal of balancing and meet the local precise adjustment of the balance weight. At last, the online dynamic balance experiment of grinding wheel spindle is carried out in the industrial field, the grinding spindle vibration displacement amplitude decreased from 17.8 to 7.7 before and after balance, fall by as much as 55%, which verifies the validity and feasibility of the system.

Design and Research of Smart Home Terminal Based on Android Platform

In recent years, the system of traditional home hasn’t fulfilled people’s pursuit of a higher quality of life requirements. Smart home is a big trend in the future development. For the Android open platform for intelligent terminals, in order to integrate Wifi, 3, 4G and other communication technologies for the home gateway as the core control center, remotely control to lighting, electrical appliances, security, monitoring as the representative of the home terminal equipment design and research of smart home terminal system is necessary. In this paper, design and research are based on Android phone of smart home terminal control system. It has been proved well that the user is able to control household appliances by Android application remotely.

Intelligent nonsingular terminal sliding-mode control via perturbed fuzzy neural network

In this paper, an intelligent nonsingular terminal sliding-mode control (INTSMC) system, which is composed of a terminal neural controller and a robust compensator, is proposed for an unknown nonlinear system. The terminal neural controller including a perturbed fuzzy neural network (PFNN) is the main controller and the robust compensator is designed to eliminate the effect of the approximation error introduced by the PFNN upon the system stability. The PFNN is used to approximate an unknown nonlinear term of the system dynamics and perturbed asymmetric membership functions are used to handle rule uncertainties when it is hard to exactly determine the grade of membership functions. In additional, Lyapunov stability theory is used to discuss the parameter learning and system stability of the INTSMC system. Finally, the proposed INTSMC system is applied to an inverted pendulum and a voice coil motor actuator. The simulation and experimental results show that the proposed INTSMC system can achieve favorable tracking performance and is robust against parameter variations in the plant.

Putting a Terminal Network Access Control System into Practice

The paper presents the concept and the main idea of network access control and uses the open source software (FreeRADIUS) as a basic framework. It brings in an terminal security status assessment ideas. At the same time, it designs and implements including authentication, configuration and implementation of security strategy and the security state of terminal evaluation as one of the terminal network access control system.

A Control System in Satellite Navigation and Communication Terminal

For the needs of a satellite navigation and communication system, we design and implement a terminal control system in the integration of navigation and communication system in this paper. The control system consists of CPU controller, GPS positioning module, smart finding and alignment satellite module, transmit/receive baseband, RF module, voice module and other functional modules, which has navigation and communication function. Satellite communication includes voice communication and data communication. The voice communication interface is operated conveniently, which using I/Q quadrature BPSK modulation to set up satellite links easily. It has a good communication quality. Data communication using the bidirectional answer mode to make success rate close to 100% in data upward to the communication center station, which is well to meet the needs in data upward.

Double inverted pendulum decoupling control by adaptive terminal sliding-mode recurrent fuzzy neural network

An adaptive terminal sliding-mode recurrent fuzzy neural network ATSRFNN control system is developed to control a coupled double inverted pendulum system. The proposed ATSRFNN control system is composed of a recurrent fuzzy neural network RFNN controller and an adaptive terminal sliding ATS controller. The RFNN controller is designed to mimic an ideal controller, and the ATS controller is designed to cope with the approximation error and external disturbance. The simulation results show the proposed ATSRFNN control system can achieve better control performance and robustness in comparison with a hierarchical fuzzy sliding-mode control system.

Petri Net Modeling: Container Terminal Production Operation Processing System Analysis

Abstract— The paper presents a new redesigned solution for container terminal production processing system. Firstly, the container terminal Production Operation Processing System process was describe by workflow and DFD Then introduce a new terminal production control system with Computing, Communicating, Controlling Technology character. In the last of article, and the integrality and credibility of new system was proved using Petri Net analysis. The new development solution is to improve some disadvantages existed in old system and to rebuild logistics processes with low cost, high quality, more flexible, faster and smart responsiveness to whole terminal production system.

Performance analysis of the air-conditioning system in Xi’an Xianyang International Airport

Reducing the energy consumption of air-conditioning systems is becoming increasingly important. This paper focuses on the air-conditioning system in Terminal 3 in Xi’an Xianyang International Airport, the first airport terminal to adopt radiant cooling in China. In the large spaces of this airport terminal, a temperature and humidity independent control (THIC) system has been adopted instead of a conventional nozzle air supply method, which significantly reduces the energy consumption of the air supply. The radiant floor is the main mechanism for indoor temperature control, while a liquid desiccant outdoor air processor combined with displacement ventilation is responsible for humidity control. Ice storage is adopted to reduce operating costs, and the supplied chilled water temperature can be as low as 3°C. This paper examines the performance of the THIC system in detail. The indoor environment is determined through measurements to be comfortable, and the on-site performances of key components in both the airport terminal and the cooling plant are investigated. The outdoor air processor supplies air of appropriate temperature and humidity ratio; two kinds of radiant floors are used for temperature control, both with measured cooling capacities of about 30–40W/m2; and the energy efficiency ratio (EER) of the cooling plant is 2.62.

Intelligent nonsingular terminal sliding-mode control using MIMO elman neural network for piezo-flexural nanopositioning stage

The objective of this study is to develop an intelligent nonsingular terminal sliding-mode control (INTSMC) system using an Elman neural network (ENN) for the threedimensional motion control of a piezo-flexural nanopositioning stage (PFNS). First, the dynamic model of the PFNS is derived in detail. Then, to achieve robust, accurate trajectory-tracking performance, a nonsingular terminal sliding-mode control (NTSMC) system is proposed for the tracking of the reference contours. The steady-state response of the control system can be improved effectively because of the addition of the nonsingularity in the NTSMC. Moreover, to relax the requirements of the bounds and discard the switching function in NTSMC, an INTSMC system using a multi-input-multioutput (MIMO) ENN estimator is proposed to improve the control performance and robustness of the PFNS. The ENN estimator is proposed to estimate the hysteresis phenomenon and lumped uncertainty, including the system parameters and external disturbance of the PFNS online. Furthermore, the adaptive learning algorithms for the training of the parameters of the ENN online are derived using the Lyapunov stability theorem. In addition, two robust compensators are proposed to confront the minimum reconstructed errors in INTSMC. Finally, some experimental results for the tracking of various contours are given to demonstrate the validity of the proposed INTSMC system for PFNS.

Design on Pulse Acquisition Circuits of Intelligent Distribution Network Digital Terminal

An intelligent distribution digital terminal pulse acquisition control system, based on C8051F021 chips as control core, is designed in this paper. The pulse acquisition circuit, RS485 communication circuit and other important parts are the control objects in this system. The system demonstrates the designing methods of hardware and software architecture by adopting the advantages of single-chip microcomputer combining hardware with software, thereby realizing multiple functions of the pulse acquisition system. This method provides a new idea to enhance the cost performance of pulse acquisition of intelligent distribution digital terminal.