Research of Fault Warning System of the Cooling Tower Fan Blade

2010 ◽  
Vol 42 ◽  
pp. 183-187 ◽  
Author(s):  
Jian Ping Chen ◽  
Wei Dong
Keyword(s):  
Real Time ◽  
Cooling Tower ◽  
Warning System ◽  
Control Unit ◽  
Pulse Signal ◽  
Failure Diagnosis ◽  
Signal Acquisition ◽  
Monitoring Method ◽  
Fault Monitoring ◽  
Fan Blade

A new monitoring method is described on the basis of the technology of the cooling tower fan monitoring and failure diagnosis, the warning system uses microprogrammed control unit real-time monitoring the blade. A magnet was fixed on the tip of every blade and these magnets were uniformly distributed in the same plane. A Hall proximity switch was fixed on the air duct which was at the same plane with the magenet, and the Hall proximity switch was used as a signal acquisition sensor, and the pulse signal of the Hall proximity swith was collected through microprogrammed control unit. Using the timing and interrupt function of microprogrammed control unit, the pulse signal was analysed and processed, when the blade breaks down and deforms, the preprogramme shut down the fan and outputted a forecast alarm, so the blade accident would be prevented. It is proved that running state of the system is good by production and practice and the monitoring method can greatly improve the reliability of the fault monitoring and warning. The monitoring system has a wide application.

Real-time fault monitoring method of charging pile based on improved RNN neural network

2021 ◽  
Author(s):  
Jian Zhang ◽  
Dan Li ◽  
Qin Xie ◽  
Weidong Liu ◽  
Bin Liang
Keyword(s):  
Neural Network ◽  
Real Time ◽  
Monitoring Method ◽  
Fault Monitoring

Design of Process Controller Based on PCI Interface and CPLD Technology

2012 ◽  
Vol 614-615 ◽  
pp. 1562-1565
Author(s):  
Yu Sen Li ◽  
Ying Sun
Keyword(s):  
Real Time ◽  
High Speed ◽  
Low Cost ◽  
Pulse Signal ◽  
Pci Bus ◽  
Signal Acquisition ◽  
Real Time Control ◽  
Time Control ◽  
Interface Chip ◽  
Design Ideas

In order to realize the sensor signal acquisition and analysis of data, according to data acquisition system design ideas of the PCI bus, applying to CPLD complex programmable controller and CH365 interface chip and combined with the actual needs of data collection ,designed a kind of low cost, high speed process controller. CPLD realizes data cache control and the control of reading. This design can gather 16 roads analog signals and real-time pulse signal of 8 roads on the same time, which includes a 16-bit digital output channel and a 32-bit counter, could be used in the real-time control.

Study of a New Real-Time Monitoring Method on the Underground Mining Activities

2012 ◽  
Vol 229-231 ◽  
pp. 1402-1405
Author(s):  
Xiu Zhi Meng ◽  
Zeng Zhi Zhang ◽  
Zong Sheng Wang
Keyword(s):  
Real Time ◽  
Underground Mining ◽  
Energy Eigenvalue ◽  
Mining Area ◽  
P Wave ◽  
Signal Acquisition ◽  
Mining Activities ◽  
Real Time Monitoring ◽  
P Waves ◽  
Monitoring Method

This paper presents a new real-time monitoring method based on the explosion source location technique on the underground mining activities in the situation the state can not achieve the full uninterrupted supervision because of the backward monitoring tools and equipment. The supervise mode results in some small coal mines in the profit-driven to ultra-layer or cross-border mining which causes a many of safety accidents. The five acceleration vibration sensors buried underground in the mining area pick up blasting vibration waves coming from blasting tunneling. Every signal acquisition sub-station deals with the according sensor output signals by using wavelet transform to identify the P waves and using energy eigenvalue method to determine the arriving time of P wave to the sensor, then translates the sensor’s spatial and temporal parameters to the principal computer. The principal computer locates the explosion source by the Geiger algorithm and displays the explosion source’s spatial message in the mine’s electronic map. The method is feasible and the positioning horizontal error is less than 10m by field-proven.

The Research on Real-Time Pulse Signal Collecting System Based on CC2430

2013 ◽  
Vol 401-403 ◽  
pp. 1436-1439
Author(s):  
Yu Xiu Xing ◽  
Yi Cao ◽  
Wei Zhang
Keyword(s):  
Real Time ◽  
Pulse Wave ◽  
Pulse Signal ◽  
Low Power Consumption ◽  
Signal Acquisition ◽  
Functional Modules ◽  
Real Time Monitoring ◽  
The Real ◽  
Pulse Sensor ◽  
Time Pulse

This paper introduced the system of real-time pulse signal acquisition based on CC2430.the original pulse signal was collected by projected pulse sensor, and then after shaping, filtering and amplification, we can get the pulse wave signal, which was stable and synchronized with the heart. After that this signal was input to the CC2430 chip, and reached the PC by ZigBee wireless communication, therefore the real-time monitoring from doctor to patient could be achieved. There were many advantages, such as simple, low power consumption, real-time coercion, etc. We can also expand the functional modules interfaces ,such as body temperature, ECG, blood pressure, to achieve the real-time monitoring more physiological parameters.

Research on the Monitoring Technique of Non-Contact Running Status of Cooling Tower Fan Blades

2011 ◽  
Vol 201-203 ◽  
pp. 2307-2311
Author(s):  
Jian Ping Chen ◽  
Wei Dong
Keyword(s):  
Fault Diagnosis ◽  
Monitoring System ◽  
Cooling Tower ◽  
Pulse Signal ◽  
Single Chip ◽  
Single Chip Microcomputer ◽  
Monitoring Method ◽  
Monitoring Technique ◽  
Blade Tip ◽  
Discontinuous Phase

This paper presents a new monitoring method of non-contact blade status—blade tip timing monitoring method based on the principle of discontinuous phase principle, and a new monitoring system of non-contact running status of cooling tower fan blades is developed on the basis of the technology of single-chip microcomputer(SCM) and the blade tip timing monitoring method.The monitoring system is controlled by the SCM and has real-time monitoring to the blade. The pulse signal which is collected by the sensor is processed by the SCM.Through using the timing and interrupt function of SCM, the pulse signal is analysed and processed, when the blade breaks down and deforms, the system will shut down the fan and output a forecast alarm, so the blade accident will be prevented. It is proved that the monitoring method can greatly improve the reliability of the fan running status and the fault diagnosis and effectively prevent the default of the blades, so the monitoring system has a wide application value.

scholarly journals Design of Seat Search System in the Classroom Based on Wireless Sensor Networks

2018 ◽  
Vol 14 (01) ◽  
pp. 119
Author(s):  
Jia Yu Chen ◽  
Cui Megxuan ◽  
Cui Megxuan
Keyword(s):  
Wireless Sensor Networks ◽  
Sensor Networks ◽  
Real Time ◽  
Monitoring System ◽  
Experimental System ◽  
Control Unit ◽  
Mobile Network ◽  
Wireless Sensor ◽  
Sensor Technology ◽  
Signal Acquisition

The purpose of this design is intended to statistics and publishes free seats information in classroom timely to students, and then save students’ time to looking for classroom. The system uses wireless sensor networks to monitor classroom vacancies. It consists of classroom monitoring system and information transmission system. The classroom monitoring system consists of a coordinator node for remote wireless communication and two collection nodes for local communications in the classroom, and that three nodes are star-connected. The tasks of the coordinator node are to collect information from the collection nodes and display and transmission. Set up two collection nodes for collecting information of the number who inter the classroom. The devices for counting include two units, signal acquisition unit is constituted with pyroelectric infrared sensor which contains RE200B probe and conditioning circuit, and the control unit is constituted with CC2530 for signal processing. LCD screen is used to real-time display in coordinator node for counting the number of coming in or out the classroom. Users who enter the teaching building check which classroom have seats available. The manner of local communication is using ZIGBEE. The entire system uses sensor technology and mobile network communication technology to achieve real-time acquisition and release of information. The ability to identify and stability of the experimental system currently implemented are strong.

scholarly journals Failure Diagnosis System for a Ball-Screw by Using Vibration Signals

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Won Gi Lee ◽  
Jin Woo Lee ◽  
Min Sung Hong ◽  
Sung-Ho Nam ◽  
YongHo Jeon ◽  
...  
Keyword(s):  
Manufacturing Systems ◽  
Vibration Signal ◽  
Failure Diagnosis ◽  
Ball Screw ◽  
Signal Acquisition ◽  
Frequency Range ◽  
Monitoring Method ◽  
Diagnosis System ◽  
Time Frequency ◽  
Defect Position

Recently, in order to reduce high maintenance costs and to increase operating ratio in manufacturing systems, condition-based maintenance (CBM) has been developed. CBM is carried out with indicators, which show equipment’s faults and performance deterioration. In this study, indicator signal acquisition and condition monitoring are applied to a ball-screw-driven stage. Although ball-screw is a typical linearly reciprocating part and is widely used in industry, it has not gained attention to be diagnosed compared to rotating parts such as motor, pump, and bearing. First, the vibration-based monitoring method, which uses vibration signal to monitor the condition of a machine, is proposed. Second, Wavelet transform is used to analyze the defect signals in time-frequency domain. Finally, the failure diagnosis system is developed using the analysis, and then its performance is evaluated. Using the system, we estimated the severity of failure and detect the defect position. The low defect frequency (≈58.7 Hz) is spread all over the time in the Wavelet-filtered signal with low frequency range. Its amplitude reflects the progress of defect. The defect position was found in the signal with high frequency range (768~1,536 Hz). It was detected from the interval between abrupt changes of signal.

scholarly journals Psychological Stress Detection and Early Warning System Based on Wireless Network Transmission

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Yaling Li
Keyword(s):  
Real Time ◽  
Wireless Network ◽  
Psychological Stress ◽  
Early Warning ◽  
Warning System ◽  
Pulse Signal ◽  
Inverse Transformation ◽  
Stress Detection ◽  
Reconstructed Signal ◽  
Network Transmission

To improve the accuracy of stress detection and stress warning errors, this paper designed a new psychological stress detection and warning system based on wireless network transmission. To achieve this objective, we established a real-time setup. The hardware of the system is composed of pulse acquisition module, signal low-pass filtering and amplification module, real-time clock module, wireless network transmission module, and power supply module, respectively. Based on the aforementioned hardware platform, the system software is designed, mainly through the construction of pulse signal noise and the use of wavelet denoising threshold for sensing wavelet packet inverse transformation, to get the reconstructed signal. The peak point of the reconstructed signal is determined, and the value of pulse signal is extracted. According to the characteristic value’s extraction results, the degree of psychological stress is quantified using the psychological stress index (PSI). When the PSI exceeds a predefined threshold, it indicates an early warning of psychological stress. The experimental results show that the psychological stress detection of our system is consistent with the expert evaluation results, the warning time is short, and the practical application effect is good.

Design of Transient Electromagnetic Signal Acquisition System Based on FPGA

2014 ◽  
Vol 602-605 ◽  
pp. 2184-2187 ◽  
Author(s):  
Bo Peng ◽  
Guang Min Sun ◽  
De Qun Zhao
Keyword(s):  
Real Time ◽  
Data Storage ◽  
Dynamic Range ◽  
Control Unit ◽  
Acquisition System ◽  
Electromagnetic Signal ◽  
Signal Acquisition ◽  
Dual Channel ◽  
Transient Electromagnetic ◽  
Field Programmable

An acquisition system applying in transient electromagnetic method (TEM) receiver has been designed in this paper. The accuracy of acquisition has been improved by using a floating-point A/D with high input dynamic range, which is composed of programmable gain amplifiers (PGA) and a dual-channel 16 bit resolution ADC. The real-time performance can be ensured by using a field-programmable gate arrays (FPGA) as the main control unit to control ADC, PGA, data storage and communication interface. By integrating a soft core CPU, Nios II, in FPGA, the complexity of circuit design was decreased, and the work efficiency of system was improved. This system, which has good performance of real-time and high integration level, can meet the needs of TEM signal acquisition.

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