The Design of Simple Experiment System for Automatic Control System

Hardware-in-the-Loop (HIL) simulation technique provides a solution to perform tests without risking damage to Line-Replaceable-Unit (LRU) and reduce costs via increasing the speed of continuous verification and validation. As an important part of verification and validation phase of a system, the Hardware-in-the-Loop simulation is one of the most effective techniques for an LRU system testing and makes a substantial contribution in avionics model integration process and realization of the system. Based on the Hardware-in-the-Loop simulation method, this paper designs the structure and parameters of a Hardware-in-the-Loop simulation test system for an indigenous flight control computer system test. This test system comprises of plant models, signal generation module, data acquisition module, record module, switching module for signal loss and error injection scenarios, and a graphical user interface. Test system includes a Peripheral Component Interconnect Extension for Instrumentation (PXI) chassis with a real-time operating system, hardware capable of converting the digital signals generated by an aircraft model into analog signals proper to LRU input signals and transmitting to LRU, also hardware capable of converting the digital signals generated by the flight control computer into analog signals to the control model and, moreover a recording unit in which all these signals are logged in parallel with data acquisition process.

We present a real-time data acquisition (DAQ) system for the long-distance reflective ghost imaging experiment which has broad application prospects in remote sensing. In the experimental setup, the light from a pseudo thermal light source is separated into signal beam and reference beam. The signal beam illuminates the target, and then the reflected light is collected by a bucket detector. In the mean time, the reference beam is directly captured by an area detector. In order to obtain the target image, the experiment requires high-speed and high-precision correlated data acquisition to collect the light intensity fluctuation in the signal beam and the reference beam. Furthermore, to reduce imaging time, real-time data acquisition is also required. The DAQ system consists of a photon-multiplier tube (PMT), a charge-coupled device (CCD) camera, a DAQ module and DAQ software. The CCD camera as the area detector connects to computer via Gigabit Ethernet. The PMT and a telescope compose the bucket detector which outputs signals to the DAQ module. The DAQ module sends acquired data to computer through universal serial bus (USB). The DAQ software collects the data and reconstructs the target image. The results of electronic tests and experiments show that the DAQ system satisfies the requirements of the experiment.

BackgroundThe experimental teaching of pediatric dentistry is a bridge between theoretical study and clinical practice, and virtual simulation technology provides a new method of instruction.MethodsWe built an experimental teaching platform using virtual simulation technology for vital pulpotomy that includes learning and examination modes. A total of 199 students majoring in stomatology in the fourth year at Sun Yat-Sen University were randomly divided into a control group (conventional teaching mode) and an experimental group (virtual simulation experimental teaching model). The teaching effect was evaluated by theoretical and experimental examination.ResultsWe found that both the theoretical and experimental scores of the experimental group were higher than those of the control group, and the theoretical scores of the experimental group after exposure to the virtual simulation experimental teaching platform were also higher than those before the class, with significant differences (P < 0.05). Feedback from the experimental group after the class indicated that the platform reinforced their theoretical knowledge and greatly improved their mastery of operational skills.ConclusionsThe application of a virtual simulation experimental teaching platform can effectively improve the teaching of pulpotomy.

With the increasing communication frequencies in 6G networks, high-speed terahertz (THz) modulation signal generation has become a critical research area. This study first proposes an on-chip high-speed THz modulation signal generation system based on lithium niobate (LN), which integrates a pair of racetrack resonator-integrated Mach–Zehnder modulators (RMZMs) with a chirped periodically poled lithium niobate (CPPLN) waveguide. The on-chip system combines near-infrared electro-optic modulation and cascaded difference-frequency generation (CDFG) for high-speed THz modulation signal generation. At 300 K, utilizing two input optical waves at frequencies of 193.55 THz and 193.14 THz, this on-chip system enables high-speed THz modulation signal generation at 0.41 THz, with a 1 Gbit/s modulation rate and a 0.25 V modulation voltage. During the simulation, when the intensity of the input optical waves is 1000 MW/cm2, the generated 0.41 THz signal reaches a peak intensity of 21.24 MW/cm2. Furthermore, based on theoretical analysis and subsequent simulation, the on-chip system is shown to support a maximum modulation signal generation rate of 7.75 Gbit/s. These results demonstrate the potential of the proposed on-chip system as a compact and efficient solution for high-speed THz modulation signal generation.

This article takes mechanical basic experimental courses as the research object, and makes full use of virtual simulation, computer graphics, Internet and other technologies to innovate experimental teaching content and methods. First, construct a mechanical basic experiment teaching system based on four levels: guided cognition, basic experiment, comprehensive design experiment and research and innovation experiment. Then, combined with the existing virtual simulation related hardware equipment of the college, a software and hardware virtual experiment platform integrating virtual 3D display and interaction is built. Finally, with the help of Unreal Engine 4 (UE4) and network technology, a Web-based 3D virtual experiment platform is designed. Through the research of this article, a basic mechanical experiment system can be constructed, the experimental teaching training program can be improved, and the engineering practice education level can be further improved. The virtual reality (VR) experiment platform proposed in this paper can improve existing teaching methods, expand experiment content, solve problems such as insufficient educational resources, and improve students’ interest and initiative in learning. The research of the network virtual p latform enables students to break through the limitations of time and space, and realize different levels of mechanical experimental courses, such as online learning and hands-on operation of guided cognition, basic experiments, comprehensive design experiments, etc.

A flexible IBM-PC based data acquisition system for nuclear physics experiments

A large amount of energy can accumulate and be stored during underground coal fires. As thermal energy cannot be easily removed using the traditional technologies of fire prevention and extinguishment, there is a potential benefit to collecting and utilizing thermal energy from coal fires and converting it to electrical energy. Thus, this work proposes a thermoelectric generator as a solution to convert thermal energy from coal fires to electrical energy. To improve the thermal energy conversion efficiency, an experimental test system was established using a thermosyphon, an electric heating module, a cooling circulation module, a thermoelectric module, and a data acquisition module. Under the condition of ensuring the same input heat and cooling boundary conditions, the influence of three factors, namely the cooling method, the connection method, and the coverage rate of thermoelectric devices, on the performance of the coal fire waste heat conversion system was studied. The results show that, compared with air cooling, water cooling provides a greater temperature difference for the thermoelectric module, and the maximum temperature difference can reach 65.90 °C. Series connection between thermoelectric devices will generate a higher open-circuit voltage and output voltage. The maximum horizontal open-circuit voltage value can reach 3.34 V, and the maximum output voltage is 2.61 V. Compared with the coverage rates of thermoelectric devices of 15.0% and 30.0%, the output power under the coverage rate of 22.5% is the largest at 0.35 W, and its thermoelectric conversion efficiency is also the largest at 0.35%. The optimal combination of thermoelectric modules obtained from the research results can provide ideas for the application of in situ coal fire prevention and control.

In order to improve the efficiency of the EDM power supply in processing difficult-to-process materials such as particle-reinforced metal matrix composites, the article proposed an ejecting-explosion EDM method, designed the signal generator module. The principle is to introduce a pulse current with a larger peak value in the traditional pulse power supply, and the two circuits cooperate with each other and process in order to increase the explosive force and discharge energy during discharge. Under the action of explosive force, they are removed together with the metal matrix in a solid form, thereby improving the processing efficiency. According to the high and low voltage composite structure, a controllable step processing waveform is proposed, and a signal generator module is designed.

The physiological functions of hyaluronan (HA) in the extracellular matrix of vertebrate tissues involve a range of specific protein interactions. In this study, the interaction of HA with the Link module from TSG-6 (Link_TSG6) and G1 domain of aggrecan (G1), were investigated by a biophysical analysis of translational diffusion in dilute solution using confocal fluorescence recovery after photobleaching (confocal FRAP). Both Link_TSG6 and G1 were shown to bind to polymeric HA and these interactions could be competed with HA(8) and HA(10) oligosaccharides, respectively. Equilibrium experiments showed that the binding affinity of Link_TSG6 to HA was maximal at pH 6.0, and reduced dramatically above and below this pH. In contrast, G1 had maximum binding at pH 7.0-8.0 and moderate to strong binding affinity over a much broader pH range (5.5-8.0). The K(D) determined for Link_TSG6 binding to HA showed a 100-fold increase in binding affinity between pH 7.4 and 6.0, whereas G1 showed a 75-fold decrease in binding affinity over the same pH range. The sharp difference observed in their pH binding suggests that pH controls the physiological function of TSG-6, with a low affinity for HA at neutral pH, but with increased affinity as the pH falls below pH 7. TSG-6 and aggrecan interact with HA through structurally homologous domains and the difference in pH-dependent binding can be understood in terms of differences in the presence and topographical distribution of key regulatory amino acids in Link_TSG6 and in the related tandem Link domains in aggrecan G1.

Based on present situation analysis of University Computer Foundation Course facing reformation in local college, for the purpose of training computational thinking ability, this paper integrates virtual experiment system into practice teaching link and constructs Virtual-Actual fusion experiment platform. It consists of four parts, such as virtual experiment platform, practical platform, network platform and comprehensive test platform. The platform provides much and enough practice training in the class and outclass for the students, trains computational thinking ability, meanwhile, improves application skills and innovative quality.

Adaptive beamforming techniques are widely used in radar, communication, sonar, navigation and other signal processing fields. The conventional experimental systems for adaptive beamforming are often carried out with a large number of Radio Frequency equipment, which leads to high cost and complexity. Therefore, it is necessary to construct an experimental system with low cost and high flexibility to verify the performance of adaptive beamforming algorithms. In this paper, an experimental adaptive beamforming platform by utilizing the microphone array is designed, where the principle of adaptive beamforming, the structure and function of each part of whole experiment system are introduced clearly. Furthermore, the corresponding experiments are deployed to verify the adaptive beamforming algorithms for radar system. The experimental results show that the designed experimental platform can validate the adaptive beamforming algorithms easily and effectively. (5 pages)

The network communication system is presented for controller of AT91SAM9261 architecture which is based on ARM926EJ-S core, modular design concept is given by the each har­d­ware related module and driver design. High processing speed of the system on the basis of this system can be extended .

Onboard X-Band Weather Radar and data filter prediction is one of core services of the Xinjiang meteorological emergency system. Based on installation conditions provided by IVECO trunk, the structure of X-band radar antenna, lifting height and antenna work requirements, combined with the modular design concept, this paper developed the X-band weather radar antenna dedicated lifting system. This system consists of radar antenna base platform, lifting rack rails, rollers, sprockets, cylinder etc. when working, the system can not only utilize the synchronizing control strategy to ensure the system stability but also quickly set up an antenna. Based on the design of Onboard X-band Weather radar antenna lifting electromechanical system, we developed the radar data management system. In this software, Object-oriented programming language, multi-threaded programming methods and software modularity method is utilized to design the platform architecture, GIS controls and dynamic mesh technology are used to make the radar map, and based on the principle of Kalman filtering, intelligent prediction approaches are studied. Computer numerical simulation and experimental results show that the electromechanical system developed by this paper has good performance and utilized the data filtering technology to provide the reliable method for meteorological warning.

Multilegged robots can adapt to complex terrains, an ability that is highly important for their research and development. To improve the adaptability and fault tolerance of such robots, the modular design concept is applied by an increase in the number of modules. A modular multilegged robot contains a trunk with six modular leg structures that can be removed at will. The interface design of the trunk and legs can achieve good tightness and high strength, thereby ensuring quick disassembly and that the trunk and legs will not fall off while the robot walks. On this basis, the gait of a robot with different numbers of modular legs is designed. Then, kinematic and dynamic models of the robots with different gaits are established, and the motion performance, which provides reference for motion control and motor selection, is analyzed. Experiments show that the robot with different numbers of legs has good motion performance. This study serves as a useful reference for the design of modular multilegged robots.

The INPUT 2 Document Reader (a new optical character recognition system)