Wet Methane and Radio Control Systems for Gas Pipelines

Virtual radio space control system is the necessary tendency to spacecraft control. Spacecraft control system based on Virtual radio is different from traditional software radio in the data paralleled transmission and time synchronization. Dynamic time-division multiplexing transmission mode is presented by analyzing the data paralleled and synchronous transmission. The problem caused by traditional software radio frame that paralleled high speed data being blocked by low speed data is solved in the transmission time delay. According to uncertainty problems of data transmission and dealing time delay caused by the asynchronous work model of the virtual radio spacecraft control system, the method of time synchronization based on the data frame structure is presented, and the measure synchronization is preformed in a general way.

The design of a wireless water level control system is introduced and discussed in detail. In this system, the wireless Proportional Integral (PI) controller is developed using the LabVIEW graphical user programming language. Zigbee wireless technology is chosen for the wireless data transfer system. The experimental testbed was built and the system software and hardware were implemented. In order to compare the performance of the wired and wireless system, a corresponding wired water level control system was built. Experimental results show that under the same PI parameters, the settling time of the wired system is 3.3 times faster than the wireless system. However, the percent overshoot using the wireless controller is 4% smaller.

Integration, which is understood as the process of functional, informational and hardware integration of sensors of various physical nature, is one of the few areas of development of electronic control systems that simultaneously improve almost all their system indicators of excellence: efficiency, survivability, informativeness, dynamism and mass-dimensional characteristics of on-board equipment. In this regard, the analysis of the impact of integration on the indicators of excellence and the consideration of this impact in the process of developing a new generation of radio control systems is a very urgent task. The purpose of the article is to provide a qualitative assessment of integration opportunities to improve the system performance of next–generation aviation radio control systems. At the qualitative level, the main advantages provided in RESU through integration are considered, and the list of theoretical, applied and technological problems that have to be solved in the development of new-generation guidance systems is highlighted. In addition, the main difficulties that complicate the integration procedure are considered. Based on the analysis of foreign and domestic literature, the main directions of the development of modern and promising integrated RES have been identified.

Recent years have witnessed adoption of wireless sensor-actuator networks (WSANs) in process control. Many real-world process control systems must handle various emergency alarms under stringent timing constraints in addition to regular control loops. However, despite considerable theoretical results on wireless control, the problem of incorporating emergency alarms in wireless control has received little attention. This paper presents, to the best of our knowledge, the first systematic approach to incorporate emergency alarms into wireless process control. The challenge in emergency communication lies in the fact that emergencies occur occasionally, but must be delivered within their deadlines when they occur. The contributions of this work are three-fold: (1) we propose efficient real-time emergency communication protocols based on slot stealing and event-based communication; (2) we build an open-source WirelessHART protocol stack in the Wireless Cyber-Physical Simulator (WCPS) for holistic simulations of wireless control systems; (3) we conduct systematic studies on a coupled water tank system controlled over a 6-hop 21-node WSAN. Our results demonstrate our real-time emergency communication approach enables timely emergency handling, while allowing regular feedback control loops to effectively share resources in WSANs during normal operations.

The paper presents a low-latency implementation of Cartesian-polar coordinate conversion in a Virtex II pro FPGA. The accuracy and resource consumption of the module is comparable to the one obtained with the Xilinx CORDIC IP Core, but the latency has been reduced to 65%. The application of the conversion module to the cavity detuning computation in low-level radio frequency control system for a FLASH accelerator has been also presented.

The problem of improving the educational process of students of scientific, technical and natural science areas of training is one of the relevant aspects of modern pedagogical research. During training, it is necessary to apply new approaches, educational technologies and techniques in order to prepare graduates who are able to independently solve complex scientific, technical and engineering design tasks in the process of modern production. Programming is a universal tool for modeling objects and processes, as well as a powerful tool in developing the thinking of students of scientific, technical and natural science fields of training. The article discusses the issues of formation of programming skills of students based on the use of the Arduino platform. The professional standards are analyzed, the main contradictions of the existing system of training future bachelors in the field of radio electronics and control systems are revealed. The method of organizing effective programming training based on the use of the Arduino platform is presented. The criteria and indicators of the levels of competence formation are given. The results of an experiment on the implementation of the described methodology of teaching programming on the basis of the I.N. Ulyanov Chuvash State University are shown. Using the chi-square criterion, statistical processing of the results of a pedagogical experiment was performed, which convincingly proves that when using the Arduino platform, most students have reached high and advanced levels of programming skills formation.

This paper presents implementation of spectrometer based on off-the-shelf software defined radio (SDR) Ettus Research USRP X300 equipped with TwinRX daughterboard. Parallelized software, employing Fast Fourier Transform (FFT), is developed which allows two channel spectrum processing in real time with bandwidths up to 50[Formula: see text]MHz per channel, sample resolution of 14 bits and FFT lengths up to 32k points. Measured Allan stability time of the spectrometer is at least 750 sin laboratory environment. Software has network server-type interface that allows to conveniently integrate the spectrometer in radio telescope observation control and monitoring system with versatility of SDR allowing to implement various observation modes, for example, total power detection functionality with high frequency selectivity, which allows to carry continuum amplitude calibration in presence of near-by radio frequency interference. Presented spectrometer has been successfully integrated and used at RT-32 and RT-16 radio telescopes of Ventspils International Radio Astronomy Centre.

In this paper, a remote-controlled and microcontroller-based cradle is designed and constructed. This system is also called Remote Control of Microcontroller-Based Infant Stimulation System or the RECOMBIS System. Cradle is an infant stimulating system that provides relaxation and sleeping for the baby. RECOMBIS system is designed for healthy full-term newborns to provide safe infant care and provide relaxation and sleeping for the baby. A microcontroller-based electronic circuit was designed and implemented for RECOMBIS system. Electromagnets were controlled by 8-bit PIC16F84 microcontroller, which is programmed using MPASM package. The system works by entering preset values from the keyboard, or pulse code modulated radio frequency remote control system. The control of the system and the motion range were tested. The test results showed that the system provided a good performance.

Low-noise frequency synthesizers are used in the main and zone radio relay broadband lines (TV, multichannel telephony), panoramic receivers and spectrum analyzers, measurement devices, as well as in any other systems that require fast and accurate switching in a wide frequency range [1]. The cardinal problem of design and construction of frequency synthesizer is the inevitable output noise rise when widening the frequency range. Existing solutions include increasing Q of the VCO, reference oscillator, precise PLL calculation, or using multiple VCO's for different frequency sub-ranges. The goal of the research is a widening of the PLL synthesizers frequency range that will be able to employ the sequential mode of functioning for radio communications, diagnostics and control systems

EPICS based low-level radio frequency control system in LIPAc

. Nonlinear consumers of electrical energy of significant capacity when operating as part of a single marine electric power system (MEPS) have a strong impact on the quality of the generated voltage, which is characterized by various electrical parameters, including the coefficient of nonlinear distortion (KND). When powered from such a network, distortion of signals from radio navigation equipment and control systems may occur, reducing efficiency of electric motors, generator equipment and electric energy consumers, deterioration of cable networks, etc. By changing active and passive methods of compensating for nonlinear voltage distortions, the influence of nonlinear electric power consumers on the voltage quality of the generated electric power at the MEPS can be reduced. One of the effective ways of compensation is the use of an active nonlinear distortion compensator, which allows you to reduce the KND to values of 4-5%. The use of a two-channel measurement and control system in an active compensator based on a voltage-boosting device is an effective way to compensate for nonlinear distortions. A new, different from the known, block diagram of the nonlinear distortion compensator is proposed, on the basis of which a simulation model of the ship's electric power system was developed in the Simulink application package of the MatLab graphical simulation environment. Simulation modeling has shown that the use of a two-channel control and measurement system makes it possible to reduce the level of nonlinear voltage distortion of the generated electricity to 2-3%, with the power of nonlinear consumers not exceeding 60% of the power source. Increasing the power of the voltage-add transformer of the active compensator under the same conditions makes it possible to reduce the coefficient of nonlinear distortion by 0.5%.

This paper presents a survey of the autopilot systems for small or micro unmanned aerial vehicles (UAVs). The objective is to provide a summary of the current commercial, open source and research autopilot systems for convenience of potential small UAV users. The UAV flight control basics are introduced first. The radio control system and autopilot control system are then explained from both the hardware and software viewpoints. Several typical off-the-shelf autopilot packages are compared in terms of sensor packages, observation approaches and controller strengths. Afterwards some open source autopilot systems are introduced. Conclusion is made with a summary of the current autopilot market and a remark on the future development.

The aerodynamic characteristics of five planar flying wing plan-forms suitable for micro air vehicles (MAVs) are investigated via a series of wind-tunnel tests. The external boundary of the five plan-forms result from slender carbon fibre (CF) struts under various degrees of buckling. The maximum lift/drag ratios were similar for all the (quite different) shapes but the stall characteristics were found to be markedly different. Results are presented of cross-plane traverses detailing the wake vector field and turbulence characteristics for two of the planforms at conditions close to stall. A MAV, based on mylar-covered buckled CF struts, is described. The MAV utilises elevon control based on modified commercially available micro radio control systems.

Introduction. In order to ensure the sustainable functioning of critical infrastructures (CI), in conditions of the growth of various types of threats, security systems (SB) for various purposes, for example, technical SB, should be created on them. As such systems, first of all, there are security alarm systems, access control and some others. These systems are usually integral parts of the overall physical protection of CI, so they play an important role in ensuring the security of CI. One of the most important SB on the CI is the identification and access control system. In recent years, specialists in these systems have paid closer attention to the issues of ensuring the security of checkpoints for vehicles. It is known that they can be one of the most vulnerable places in the system of physical protection of the CI. Based on this, the task of improving identification and access control systems, including the vehicle, is currently an urgent scientific and practical task, and therefore require further study. Aims and Purposes. The purpose of this study is to develop a simplified conceptual design of the wireless identification and access control system of the vehicle on the CI. Methods. To achieve this goal, the methods of system analysis, elements of the theory of radio engineering, as well as methods of analysis, description, generalization, results of research works on the subject of research were used. Results and discussion. The existing systems of wireless identification and access control on CI are considered on the example of wireless identification and access control systems of the vehicle. Some ways of improving the safety and reliability of the operation of these systems are outlined. The analysis of ways to improve the systems of wireless identification and access control on CI is carried out on the example of wireless identification and access control systems of the vehicle. A simplified conceptual design of the wireless identification and access control system of the vehicle on CI has been developed. The main primary provisions of the system under development related to the circuit engineering stage of conceptual design are formulated. Conclusions. As a result of the conducted research, a simplified conceptual design of the wireless identification and access control system of the vehicle on CI has been developed. According to the authors, the developed simplified conceptual project, with appropriate adaptation, can be applied in practice for the purposes of ensuring the physical protection of CI. Keywords: critical infrastructure; identification systems; access control; wireless data transmission systems; conceptual project.

There is a strong trend towards wireless networked Real-Time Control Systems. However, a variety of factors such as the variability of wireless channel capacities, multi-path fading, and ambient interference make it extraordinarily difficult to design and implement Wireless Control Systems (WCSs). To attack the uncertainty in available communication resource in WCSs, this chapter presents an Adaptive Feedback Scheduling scheme that takes advantage of the methodology of cross-layer design. The proposed approach exchanges information across the physical layer and the application layer in the presence of noise interference and link transmission rate variations. The overall QoC is guaranteed through controlling the deadline miss ratio of control loops. Design parameters of the feedback scheduler are adapted to dynamic changes in wireless channel capacity. To further improve the feedback scheduling performance, an event-driven invocation mechanism for feedback schedulers is suggested. Simulation results demonstrate that this approach is efficient to deal with channel capacity variations and noise interference, thus providing an enabling technology for wireless control in dynamic environments. It is also argued that in this context event-driven invocation mechanism improves the performance of the feedback scheduling system.KeywordsSampling PeriodTransmission RateMedium Access ControlControl PerformanceMedium Access Control ProtocolThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.