Method of Diagnostics of Multichannel DataTransmission System

Aiming at a multi-channel data acquisition and transmission system based on FPGA, the design scheme, functional circuit and logic design method of the system are introduced in detail. The system uses FPGA as the control core to control TLC2543 analog-to-digital converter and complete the circulation acquisition of 11-channel analog data. The transmission end uses Ethernet chip RTL8201 to communicate with the upper computer, which can monitor the data changes of each channel. The correctness of each function module is verified by software simulation. The design can meet the requirements of multi-channel signal acquisition and transmission.

Cutting condition monitoring plays an important role in modern manufacturing to improve cutting efficiency and machining accuracy, and reduce cost. More and more researchers start integrating the sensors into the tool holder to detect the cutting status information in view of its convenient use and wide applicability. However the sensor signals are difficult to transmit out through traditional wired way as the tool holder is in high-speed rotation in milling process. Therefore, a multi-channel high-precision wireless data acquisition and transmission system was designed and developed. The system hardware was designed based on AD7606 and AR9331, and a STM32 was used as the microcontroller. The data transmission was based on socket, and the software of the system was completed. Finally, a series of tests were carried out to evaluate the performance of the developed system, including collecting DC voltage and sinusoidal signal under the static state, and applying to the smart tool holder to carry on the data acquisition and transmission test under the rotating state. The test results showed that the developed system had high reliability and precision, and could collect the sensor signals from the tool holder and transmit to the host computer timely and accurately.

The authors have designed a multi-purpose multi-channel data recording and transmission system for the laser strainmeters and the related geophysical and seismic equipment intended for service in operating mines.

In recent years, advances in wearable medical devices have been driven by the development of flexible sensors and wireless IoT technologies, with research and applications in this field rapidly increasing. Plantar pressure analysis is a gait method that can be used to analyze foot pressure during human movement to identify potential health problems, but most of the devices based on this method are currently single-functional, poorly portable, and expensive. This work proposes a smart insole using meshless conductive rubber sensors, as well as a multi-channel data acquisition and transmission system based on these sensors, deep learning networks, and Bluetooth technology. The smart insole sensing unit and circuit board were made of flexible materials and powered by rechargeable lithium batteries. The system can be used to collect plantar pressure data from the sensors in real time, analyze the pressure in different regions of the foot through a neural network, and infer the gait cycle and abnormal gait of the user. The effective communication range can be up to 70 meters under barrier-free conditions. This smart insole has a bright future thanks to the pressure detection range, fast response time, and good durability.

We report an atmospheric multichannel data transmission system with channel separation by vortex beams of various orders, including half-integer values. For the demultiplexing of the communication channels, a multichannel diffractive optical element (DOE) is proposed, being matched with the used vortex beams. The considered approach may be realized without digital processing of the output images, but only based on the numbers of informative diffraction orders, similar to sorting. The system is implemented based on two spatial light modulators (SLMs), one of which forms a multiplexed signal on the transmitting side, and the other implements a multichannel DOE for separating the vortex beams on the receiving side. The stability of the communication channel to atmospheric interference and the crosstalk between the channels are investigated.

The main goal of the study is to determine the direction of transformation of “SibADI” FSBEI HE as a center of attraction for all concentrated knowledge, skills and abilities in the development of the road industry, within the framework of the development conditions established by the scientific and technological revolution. This takes into account synchronization of all efforts on the part of scientific communities and industrial partners. Today, the Siberian State Automobile and Highway University faces the task of transforming from an industry-specific university with an accumulated scientific base. It includes transport construction, into an entrepreneurial University with commercialization of scientific, technical and educational and results in the following areas: “Creation and testing of intelligent composite materials”; “Creation of automated complexes for modeling multicomponent new road materials, including those of technogenic soils”; “Informational modeling of road objects with data transmission system”; “New methods of road diagnostics and defect recognition”; “Digital control, monitoring, forecasting systems”; “Intelligent logistics and design of network road configurations, as well as the development and transfer of entrepreneurial competencies into educational сontent”. The specificity of training of engineers requires reaching a qualitatively new level, which makes it possible to enter the number of international recognized specialized universities, to solve ambitious tasks.

The modified discrete chaotic map based on Chebyshev polynomial is proposed for the design of chaotic signal code constructions. The result can be used for the design of multi-channel chaotic data transmission systems of special purpose.

This paper reports on transient processes and cross talk (cross modulation) in an O-band (1260 – 1360 nm) bismuth-doped phosphosilicate fibre amplifier. Times characterising dynamic parameters of the amplifier at a pump wavelength of 1.23 μm have been determined experimentally. Data have been obtained on the effect of the modulation frequency Ω of one of the channels in the range 10 Hz to 1 MHz on the cross-talk intensity in another channel. The data, in combination with numerical calculation results, show that the cross talk in the Bi-doped fibre amplifier is insignificant at modulation frequencies Ω above 100 kHz. Our results demonstrate that O-band Bi-doped fibre amplifiers are potentially attractive for practical application in multichannel high-speed data transmission systems.

The results of a recent study to determine and evaluate effective methods of applying forward-acting error-control-coding techniques to multichannel high-frequency (HF) data modems are presented. A unique feature of this study is a conscious exploitation of the fine-grain bit-error behavior, both in time and in frequency, that is characteristic of multichannel HF data transmission systems. Attention is focused on the ability of four promising coding techniques to combat the characteristic error behavior. These techniques involve the use of bit-interleaved binary block codes, diffuse convolutional codes, block-interleaved two-stage concatenated codes with binary-coded inner stages and nonbinary-coded outer stages, and a class of two-stage binary codes with random-error-correcting inner stages and burst-error correcting outer stages.

A continuous monitoring of the healing process of bone fractures by active, microelectronic implants is a potential measure to prevent complications. So far bone healing is monitored by diagnostic methods such as X-ray, CT and MRT. For ascertaining the permitted stress of implants, e. g. in dental surgery, heretofore clinical experiences are consulted. For these and further parameters a capture by measurement engineering would be preferable.An active, autonomously working implant for direct mounting at bone fractures was developed. It contains a sensor, an electronic control circuit, a radio system and a battery for power supply. The oxygen saturation of the extracellular tissue fluids at the site of fracture is measured periodically. Via a radio transmitter in the implant, an external receiver and a data transmission computer with wireless LAN connection to the internet, the measured values are sent to a web server with a marginal time lag. From there the data are retrieved with a web browser. The implant is coated with a biocompatible synthetic resin in order to avoid any contact between the electronic circuitry and the body tissue.The system was tested in-vivo by implantation into artificial bone defect at the cranial calvarium of sheep. The preliminary test validated the functionality of the data transmission system and the biocompatibility of the implant. A close contact between implant and surrounding tissue was verified by visual inspection after sacrificing the animal. However, the correlation between the dissolved oxygen saturation and the healing process could not be confirmed as yet. Because the measured values were subject to drift and the used sensor could not be calibrated in-situ, a physiological interpretation of the data is not possible.

Subject of research. Evaluation of the impact of priority data transmission in multi-channel systems of high load, presented as a queuing system with prioritization of applications. Method. The impact of priorities on the efficiency of data transmission in multichannel systems was assessed using simulation methods and mathematical statistics. Main results. A numerical method for calculating time indicators based on a simulation model of a multichannel data transmission system with a non-uniform load is proposed. Simulation experiments have been carried out to evaluate the impact of priority data transmission at various coefficients of variation in the intensity of requests on time indicators in a multichannel system. The areas of efficiency of using priorities in highly loaded multichannel data transmission systems are shown. Practical significance. The presented results can be used in the design of high-load multichannel computer data transmission systems.

The design and testing of multi-channel data transmission systems for a transient turbine test rotor are presented. Two multi-channel systems were required for the conditioning and transmission of the electrical signals from thin film gauges and un-packaged embedded pressure transducers which are to be used for the measurement of rotor blade surface heat transfer and pressure respectively. All measurements will be taken from the same rotor at design Mach and Reyoolds numbers. Signal conditioning and amplification will be performed in the rotating frame to solve the problems associated with accurate sigoal transmission. Also, the use of a multi-chanoel array of light emitting diodes for data transmission is described which allows accurate signal reconstruction. Both systems have been initially stress screened and are shown to have an adequate bandwidth for resolving wake blade interactions.

Design of High-Speed Multi-channel Data Transmission System Based on Single-Chip Microcomputer

In order to meet the long-distance and high-reliable transmission needs of multi- channel data, a multi-channel data transmission system based on PCIE-SRIO is designed. The Xilinx K7 series FPGA chip is designed, and the internal integrated PCIe and SRIO IP cores are used, and then the optical cable is connected to the optical cable to achieve long -range data sending and receiving. The system is based on the PCIe bus to realize the interconnection between the CPU chip and the FPGA chip, and the FPGA actively initiates and terminates the DMA transmission method to realize the high-speed interaction of multiple channels of data between the CPU chip and the FPGA chip. The internal logic of FPGA realizes SRIO interface based on HELLO packet format, and the sender uses Round-Robin arbitration mechanism to design multi-interface, which realizes the com-petition processing when multi-channel interfaces share a SRIO interface to send data at the same time. The results show that the designed system can realize data sending and receiving under 8 channels at most, which has certain reference significance for the application of long-distance transmission of interconnected data between boards.

The article presents the results of research on the protection of multichannel data transmission systems with channel division by the signal form (code) from unauthorized access. It is proposed to use derivatives of Walsh functions as spreading codes used in the formation of noise-like signals in multichannel communication systems. The analysis showed that the correlation properties of the derivatives of Walsh functions used as spreading codes have significantly better correlation characteristics than the original Walsh functions. It was justified the advantage of using these signals in the development of CDMA systems in order to reduce the interference level of multiple access and protection against unauthorized access.