High reliability transmission system in mobile front haul using a maximal ratio combined receiver with direct and lite-coherent detections

2019 ◽  
Author(s):  
Jun Qin ◽  
Rahul Kumar Gangwar ◽  
Siming Liu ◽  
Xingjun Wang
Keyword(s):  
High Reliability ◽  
Transmission System ◽  
Combined Receiver

UAS measurements for the investigation of emissions of air pollutants at the Duesseldorf airport and industrial sites in the Rhine-Ruhr area, Germany

2021 ◽  
Author(s):  
Konradin Weber ◽  
Christian Fischer ◽  
Martin Lange ◽  
Tobias Pohl ◽  
Tim Kramer ◽  
...  
Keyword(s):  
Data Transmission ◽  
Air Pollutants ◽  
High Reliability ◽  
Measurement Techniques ◽  
Transmission System ◽  
Online Data ◽  
Ruhr Area ◽  
Measurement Systems ◽  
Industrial Sites ◽  
Data Transmission System

<p>Instrumented UAS (unmanned aerial systems, drones) can substantially enhance the capabilities for the investigation of air pollutants, when equipped with the appropriate and customized air pollution measurement systems. Important advantages can be found in the exploration of vertical and horizontal pollutant profiles as well as in the determination of fugitive emissions. The HSD Laboratory for Environmental Measurement Techniques (UMT) has developed a series of different multicopter UAS for various measurement tasks and payloads. Additionally, different commercial UAS are used by UMT. The multicopter UAS are equipped, depending on the measurement task, with different specifically adopted lightweight measurement systems for aerosols (PM10, PM2.5, PM1, UFP, PNC, number size distributions) or gases like O<sub>3</sub>, SO<sub>2</sub>, NO<sub>X</sub>, CO<sub>2</sub> and VOCs. All measurement systems were intercompared with certified standard measurement equipment before use to assure the quality of the measurement results. Moreover, physical samples of aerosols can be taken during the flight, which enables a chemical or REM analysis after the flight.</p><p>Additionally, UMT developed an on-line data transmission system, which allows the transmission of measurement data during the flights from the UAS to the ground for continuous monitoring. In this way concentration plumes can be tracked and hotspots can be pinpointed during the flight. This online data transmission system is independent of commercial platforms, can work on different radio frequencies in a push mode (presently on 2.4 GHz) and communicates with RS232 and I<sup>2</sup>C interfaces. Within several intercomparison studies this online data transmission proved a high reliability and correctness of transmitted data.</p><p>In addition to technical details of the UAS and instrumentation we present in this contribution the results of different measurement campaigns based on our UAS measurements:</p><ul><li>Investigations of emissions from the Duesseldorf airport combining upwind and downwind UAS measurements. These investigations became of special interest, as due to the reduced air traffic caused by the Corona pandemia now single aircraft starts and landings could be monitored with their emissions at elevated altitudes.</li> <li>Investigations of vertical concentration profiles above the city of Duesseldorf, which could be influenced by industrial sites in the north of Duesseldorf as well as by the Duesseldorf airport.</li> <li>Investigations of vertical and horizontal pollution distributions near, at and around industrial sites in the Rhine Ruhr area, especially of metal industry plants and chemical plants.</li> </ul><p>These examples highlight the capabilities of UAS measurements, which will be further enhanced by planned simultaneous use of several UAS in parallel and joint tasks.</p>

scholarly journals Nonlinear Torsional Vibration Analysis and Control of Semidirect Electromechanical Coupling Transmission System in Shearer

2019 ◽  
Vol 2019 ◽  
pp. 1-12
Author(s):  
Song Jiang ◽  
Wei Li ◽  
Lianchao Sheng ◽  
Jiajun Chen ◽  
Min Li
Keyword(s):  
Hopf Bifurcation ◽  
Torsional Vibration ◽  
Electromechanical Coupling ◽  
High Reliability ◽  
Permanent Magnet Synchronous Motor ◽  
Nonlinear Damping ◽  
Transmission System ◽  
Concentrated Mass ◽  
Mass Model ◽  
Hurwitz Stability

The nonlinear torsional vibration and instability oscillation caused by nonlinear damping in the shearer electromechanical coupling cutting transmission system in shearer driven by the permanent magnet synchronous motor (PMSM) is investigated in this paper. The electromechanical coupling transmission system in the shearer is equivalent to a concentrated mass model for the purpose of establishing the system dynamic model by the Lagrange–Maxwell equation. Then, the Routh–Hurwitz criterion is used to determine the torsional vibration critical point and stability region for the Hopf bifurcation for the cutting transmission system. According to the Routh–Hurwitz stability criterion, the Hopf bifurcation type and the effect of the supercritical Hopf bifurcation in the torsional vibration of the cutting transmission system are analyzed. Furthermore, based on the washout filter, the Hopf bifurcation controller is designed for suppressing the transmission system’s large vibration amplitude and unstable oscillation. In addition, the influences of the linear gain and nonlinear gain on the bifurcation point and the limit cycle amplitude are discussed. Finally, the numerical simulation results indicate the effectiveness of the designed controller. The research achievements can provide a theoretical basis for design or optimize the cutting transmission system of high-reliability shearer driven by PMSM.

Development of Contactless Torque Sensor Based on SAW Resonators

2019 ◽  
Author(s):  
Wei Han ◽  
Xiongzhu Bu ◽  
Yihan Cao ◽  
Miaomiao Xu
Keyword(s):  
Measurement System ◽  
High Reliability ◽  
Transmission System ◽  
Torque Sensor ◽  
Torque Measurement ◽  
Sensing Element ◽  
Differential Measurement ◽  
Saw Devices ◽  
Calibration Experiment ◽  
Saw Resonators

Abstract This paper presents a wireless clamp-on torque sensor based on dual or quad one-port SAW resonators to meet the measurement requirements of transmission system. Firstly, the principle of clamp-on torque sensor is introduced, the mechanical model of the structure is calculated and simulated by theoretical analysis and COMSOL. The differential measurement method is confirmed, and the optimal structure parameters are studied. Then, the torque sensitive theory of SAW devices is analyzed, the differential SAW torque sensing elements and the measurement system are designed based on the frequency division multiple access (FDMA). And a novel sensing element installation method is proposed, which reduces the installation error influence on sensor accuracy. Finally, the clamp-on structure prototype and measurement system are verified by the static calibration experiment. The results show that: the torque sensor has the capability that 1.931 KHz/Nm of sensitivity under ±100 Nm with good linearity and consistency. The torque sensor has the advantages of wireless, non-contact, easy installation, high reliability, and easy maintenance, it is suitable for the torque measurement of transmission system.

Secure Transmission Model Technology Scheme of Massive Train Information

2014 ◽  
Vol 513-517 ◽  
pp. 699-702
Author(s):  
Na Chen ◽  
Jin Hui Chen ◽  
Fei Zhong ◽  
Hong Hui Dong ◽  
Yi Fan Gao
Keyword(s):  
Information Transmission ◽  
High Reliability ◽  
Transmission System ◽  
Transmission Model ◽  
Security Issues ◽  
High Security ◽  
Moving Train ◽  
Secure Transmission

Secure Transmission Model of massive train information is mainly to cater for train-ground information transmission system, to solve the high reliability and high security issues of massive moving train data. Secure Transmission Model technology scheme of massive train information includes software solutions and hardware technology solutions.

scholarly journals Research on matching conditions of coaxial six-branch split-torsion herringbone gear transmission system

2021 ◽  
Vol 39 (2) ◽  
pp. 341-349
Author(s):  
Zhibin Li ◽  
Sanmin Wang ◽  
Fei Li ◽  
Qi'an Peng ◽  
Jianfeng Li
Keyword(s):  
Calculation Method ◽  
High Speed ◽  
High Reliability ◽  
Three Dimensional ◽  
Matching Condition ◽  
Transmission System ◽  
Gear Transmission ◽  
Heavy Load ◽  
Gear Transmission System ◽  
Herringbone Gear

Compared with traditional gear transmission, the multi-branch split-torsion gear transmission system has the advantages of large transmission power, small size and high reliability, so it is more and more used in high-speed heavy load occasions such as ships and aircraft. Since the transmission system of multi-branch split torsional gears belongs to over-constrained configuration, it is necessary to meet strict tooth matching condition in the design process in order to realize the correct synchronous meshing of each branch, which is of great significance to ensure its uniform installation and motion synchronization.Aiming at the coaxial six-branch twisted herringbone gear transmission system, this paper establishes a calculation method for the proper meshing conditions of each branch on the basis of considering the movement synchronization of each branch and preventing geometric interference.In addition, the calculation of gear allocation was carried out for a ship's power transmission system, and a parameter scheme that satisfies the requirements of transmission ratio, concentricity and synchronous meshing was obtained.The correctness of the calculation method of tooth matching in this paper is verified by three-dimensional modeling. This method has universal application value to the tooth matching design of other coaxial multi-branch gear transmissions.

Reliability Analysis on Gearbox Transmission System of Agricultural Machinery Chassis Based on FTA

2013 ◽  
Vol 694-697 ◽  
pp. 876-882
Author(s):  
Li Xiang Zhang ◽  
Shou Rong Liu ◽  
Wei Long Li ◽  
Xin Jia Meng
Keyword(s):  
Weak Link ◽  
High Reliability ◽  
Fault Tree ◽  
Fault Tree Analysis ◽  
Transmission System ◽  
Relative Probability ◽  
Minimal Cut Sets ◽  
Combine Harvester ◽  
And Function ◽  
And Control

Fault Tree Analysis (FTA) was used to analyze the reliability of gearbox transmission system of 4LZ-2 combine harvester (4LZ-2 CHGTS). Firstly, the structure and function of the 4LZ-2 CHGTS were made a detailed introduction, and the components were divided into three kinds of A, B and C. Secondly, the Fault Tree (FT) model of the 4LZ-2 CHGTS was estabilished using the "top to down" ideology. Finally, based on the FT, the minimal cut sets (MCSs) were given and the weak link of the system was found out by the qualitative analysis; furthermore, the relative probability importance of each basic event and the reliability of the 4LZ-2 CHGTS were analyzed by the quantitative analysis. The results show that the 4LZ-2 CHGTS is of high reliability, and the fault of gears needs to be taken into a key consideration and control in the design process of the GTS.

A High-Reliability 565 Mbit/s Trunk Transmission System

1986 ◽  
Vol 4 (9) ◽  
pp. 1396-1403 ◽  
Author(s):  
P. Cochrane ◽  
R. Brooks ◽  
R. Dawes
Keyword(s):  
High Reliability ◽  
Transmission System

scholarly journals Analysis of Reliability States of an Industrial Network Data Transmission System

2018 ◽  
Vol 46 (1) ◽  
pp. 137-152
Author(s):  
Marcin Bednarek ◽  
Tadeusz Dąbrowski
Keyword(s):  
Control Systems ◽  
Distributed Control ◽  
Data Transmission ◽  
High Reliability ◽  
Process Variable ◽  
Transmission System ◽  
Distributed Control System ◽  
Industrial Systems ◽  
Industrial Networks ◽  
Data Transmission System

Abstract Industrial networks combine elements of distributed control systems. These elements are process stations, operator stations, engineering stations and other elements, which enable the exchange of data between industrial systems. Industrial systems are used to send process variable values and other data exchanged between the stations - elements of a distributed control system and SCADA systems. The fitness of an entire station system depends on the fitness of the communication system. This is why industrial networks are characterized by high reliability. When speaking about the fitness of a data transmission system, we can consider its instantaneous fitness (functional) or interval fitness (task-related). It is not always necessary to maintain instantaneous fitness. Sometimes interval fitness is enough. The paper discusses the issue of a need to maintain one of them, relative to various types of data transmission.

Design of Generally Remote Transmission System

2011 ◽  
Vol 480-481 ◽  
pp. 916-921 ◽  
Author(s):  
Yun Hong Li ◽  
Xin Hai Yang
Keyword(s):  
Data Transmission ◽  
High Speed ◽  
High Reliability ◽  
Transmission System ◽  
High Data ◽  
Remote Transmission ◽  
Transmission Process ◽  
Transmission Channels ◽  
Network Transmission ◽  
Multiple Network

This paper introduces the design of generally remote transmission system with high reliability and multi-transmission-channels. Using a high-speed 32-bit ARM ® Cortex ™ - M3 processor, with multiple network transmission channels, it can be applied to complexly industrial field for reliable data transmission. The system has been successfully applied in Internet of Things of fire networking, which shows that it has high data reliability and a good utility value in the transmission process of the system.

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