scholarly journals An Automatic Fault Recognition Method for Side Frame Key in TFDS

2015 ◽  
Vol 9 (1) ◽  
pp. 22-27 ◽  
Author(s):  
Guodong Sun ◽  
Wei Feng ◽  
Daxing Zhao ◽  
Linjie Yang
Keyword(s):  
High Speed ◽  
High Efficiency ◽  
Detection System ◽  
Region Of Interest ◽  
Recognition Method ◽  
Fiber Network ◽  
Car Detection ◽  
Fault Recognition ◽  
The Impact ◽  
Through Hole

Trouble of moving Freight car Detection System (TFDS) constitutes an important part of the railway safety warning systems. With TFDS, dynamic images of freight cars are captured by high-speed cameras, timely transmitted to the train inspection center by special optical fiber network and finally observed for fault recognition. In this paper, an automatic fault recognition method for side frame key in TFDS is proposed based on open source computer vision library (OpenCV) to overcome the disadvantages of manual fault recognition. At first, image preprocessing and segmentation are applied to eliminate the impact of the surrounding environment and further simplify images. Then the axle and through-hole are calibrated through Hough circle transformation and the side frame key is located indirectly according to the geometric relationship among the axle, through-hole and side frame key. Finally, the difference of mean gray values in the region of interest (ROI) is analyzed to judge whether the side frame key is missing or not. Featured by the high efficiency, reliability and practicability, the proposed method lays the foundation for engineering applications in automatic fault recognition of freight cars.

scholarly journals Sistem Penegakan Speed Bump Berdasarkan Kecepatan Kendaraan yang Diklasifikasikan Haar Cascade Classifier

2019 ◽  
Vol 7 (1) ◽  
pp. 12-18
Author(s):  
Muhammad Zulfikri ◽  
Erni Yudaningtyas ◽  
Rahmadwati Rahmadwati
Keyword(s):  
High Speed ◽  
Road Traffic ◽  
Detection System ◽  
Warning System ◽  
Detection Accuracy ◽  
Cascade Classifier ◽  
Car Detection ◽  
Speed Measurement ◽  
Haar Cascade ◽  
Safety Limit

Driving at high speed is among the frequent causes of accidents. In this research, a warning system was developed to warn drivers when their speed beyond the safety limit. Haar cascade classifier was proposed for the detection system which comprises Haar features, integral image, AdaBoost learning, and cascade classifier. The system was implemented using Python OpenCV library and evaluated on road traffic video collected in one way traffic. As a result, the proposed method yields 97.92% of car detection accuracy in daylight and MSE of 2.88 in speed measurement.

Loading Rate Effect Investigation of Through-Hole-Mounted Solder Joints

2005 ◽  
Author(s):  
Frank Z. Liang ◽  
Larry M. Palanuk ◽  
Mike Gabriel
Keyword(s):  
Solder Joint ◽  
High Speed ◽  
Loading Rate ◽  
High Loading ◽  
Static Tests ◽  
Loading Rates ◽  
Wide Range ◽  
Load To Failure ◽  
The Impact ◽  
Through Hole

This paper presents two simple and unique tests to extract shock-level loading limits for eutectic and lead free solders. A wide range of loading rates, from quasi-static to high speed, was applied to a through-hole-mounted anchor assembly test coupon. The high speed shock tests were conducted on a drop shock table where the impacting velocities were derived through table input adjustments. The quasi-static tests were done using controlled hydraulic linear actuator with a load cell. As would be assumed, the dynamic load to cause solder joint failure was found to increase with higher loading rate. However, at such a high loading rate range, the impact velocity did not change the load to failure. This study leads to an interesting hypothesis that at high loading rates, the solder joint strain rate may not see a significant change as observed at low rates.

scholarly journals Design of a system solution that modernizes legacy supervisory control and data acquisition systems as an early detection system

2018 ◽  
Vol 51 (7-8) ◽  
pp. 205-212 ◽  
Author(s):  
Beşir Demir ◽  
Ahmet Tumay ◽  
Mehmet Efe Ozbek ◽  
Enver Cavus
Keyword(s):  
Early Detection ◽  
Data Acquisition ◽  
Supervisory Control ◽  
High Speed ◽  
Data Transfer ◽  
Detection System ◽  
Data Acquisition Systems ◽  
Gateway System ◽  
System Solution ◽  
The Impact

Background In industrial disasters, early detection of problems and crisis management are critical for saving the lives of people and reducing the impact of disasters. Purpose In this study, we design a special gateway system that bridges the gap between different communication protocols and enables legacy supervisory control and data acquisition systems to function early detection systems for potential industrial disasters. Methods The system uses a new queue mechanism to substantially improve the problem of data loss found in conventional supervisory control and data acquisition systems and utilizes identification (ID) prioritization to enable early detection of problems. The proposed system is implemented and tested on a Linux-based, 3G-capable Modbus gateway system. Modbus is used as the communication protocol and 3G technology is utilized to provide high-speed wireless data transfer components. The Modbus gateway device uses an ARM-based EP9302 processor and has digital input/output, relay outputs, and RS485 outputs. Conclusion This study is significant as it is the first work to show the application of the priority query execution method for Modbus gateway devices.

scholarly journals Investigating the Impact of Power-Take-Off System Parameters and Control Law on a Rotational Wave Energy Converter’s Peak-to-Average Power Ratio Reduction

2020 ◽  
Author(s):  
H. Bora Karayaka ◽  
Yi-Hsiang Yu ◽  
Nathan Tom ◽  
Eduard Muljadi
Keyword(s):  
Wave Energy ◽  
High Speed ◽  
High Efficiency ◽  
Average Power ◽  
Gear Ratio ◽  
Irregular Waves ◽  
Strong Impact ◽  
Power Ratio ◽  
Hardware In The Loop ◽  
The Impact

Abstract Due to the irregular nature of real waves, the power captured in a wave energy converter (WEC) system is highly variable. This is an important barrier to the effective use of WECs. To address this challenge, this study focuses on a rotational WEC power-take-off system in which high-speed and high-efficiency generators along with a torque/power smoothing inertia element can be effectively utilized. In the first phase of this study, the U.S. Department of Energy’s reference model 3 (WEC-Sim RM3; two-body point absorber), along with a slider-crank WEC, were integrated for linear to rotational conversion. Relative motion between the float and spar in RM3 was the driving force for this slider-crank WEC, which is connected to a motor/generator set through a gearbox. RM3 geometry was scaled down by 25 times to work within the limits of the physical motor/generator set used in the experimentation. Once the integration in a hardware-in-the-loop simulation environment was successfully completed, data on the peak-to-average power ratio was collected for various wave conditions including regular and irregular waves. The control algorithm designed to keep the system in resonance with waves was able to maintain relatively high speed depending on the specific gear ratio and wave period. Initial results with hardware-in-the-loop simulations reveal that gear ratio and crank radius have a strong impact on the peak-to-average power ratio. In addition, it was found that output power from the generator was maximized at a larger gear ratio, as the crank radius was increased.

Experimental Study on GMAW with Strip Electrode

2011 ◽  
Vol 314-316 ◽  
pp. 1025-1028
Author(s):  
Sen Mu Zheng ◽  
Hong Ming Gao
Keyword(s):  
High Speed ◽  
High Efficiency ◽  
Rectangular Cross Section ◽  
Strip Electrode ◽  
Welding Arc ◽  
Arc Pressure ◽  
Round Wire ◽  
The Impact ◽  
High Efficiency Welding ◽  
Welding System

GMAW with strip electrode is a new method, which uses the flat wire with a rectangular cross-section to replace the conventional round wire as consumable electrode. In the present study, the welding system was established. Then the typical arc behavior and metal transfer were analyzed. After that, high-speed-high-current welding experiment was carried out in both GMAW with strip electrode and conventional round wire. The results show that, Compared with the conventional GMAW with round wire, the welding arc of GMAW with strip electrode has much lower arc pressure, and the impact of the droplet on the weld pool is weakened remarkably. These two characteristics make GMAW with strip electrode suitable for high efficiency welding on the basis of maintaining the original advantages of GMAW.

scholarly journals In-Service Detection and Quantification of Railway Wheel Flat by the Reflective Optical Position Sensor

Sensors ◽  
2020 ◽  
Vol 20 (17) ◽  
pp. 4969
Author(s):  
Run Gao ◽  
Qixin He ◽  
Qibo Feng ◽  
Jianying Cui
Keyword(s):  
High Speed ◽  
Detection System ◽  
Quantitative Relationship ◽  
Real Field ◽  
Position Sensor ◽  
Analysis Model ◽  
Railway Wheel ◽  
Optical Position ◽  
Wheel Flat ◽  
The Impact

Railway wheel tread flat is one of the main faults of railway wheels, which brings great harm to the safety of vehicle operation. In order to detect wheel flats dynamically and quantitatively when trains are running at high speed, a new wheel flat detection system based on the self-developed reflective optical position sensor is demonstrated in this paper. In this system, two sensors were mounted along each rail to measure the wheel-rail impact force of the entire circumference by detecting the displacement of the collimated laser spot. In order to establish a quantitative relationship between the sensor signal and the wheel flat length, a vehicle-track coupling dynamics analysis model was developed using the finite element method and multi-body dynamics method. The effects of train speed, load, wheel flat lengths, as well as the impact positions on impact forces were simulated and evaluated, and the measured data can be normalized according to the simulation results. The system was assessed through simulation and laboratory investigation, and real field tests were conducted to certify its validity and correctness. The system can determine the position of the flat wheel and can realize the quantification of the detected wheel flat, which has extensive application prospects.

scholarly journals Applications of ceramics in composite protective structures

2021 ◽  
Vol 2 (396) ◽  
pp. 52-66
Author(s):  
A. Dulnev ◽  
Keyword(s):  
High Speed ◽  
Analytical Approach ◽  
High Efficiency ◽  
Experimental Studies ◽  
Ceramic Materials ◽  
Ship Structures ◽  
Collapse Simulation ◽  
Crystalline Ceramic ◽  
Protective Structures ◽  
The Impact

Object and purpose of research. The object of the study is ceramic-containing protective structures. The purpose of the study is to substantiate the feasibility and effectiveness of using ceramics as part of standard ship structures for protection against the effects of high-speed damaging elements. Materials and methods. Composites of the "ceramic + steel", "ceramic + fiberglass" type, made with the use of poly-crystalline ceramic materials based on boron carbide, nitride and silicon carbide, aluminum oxide and some other types, are considered. The study is based on an analytical approach, the results of ballistic tests of ceramic-containing composites and computational collapse simulation of ceramics in the composition of armor structures. Main results. The results of experimental studies demonstrating the level of efficiency of ceramic-containing structures are presented. The influence of the fragmentation features of various types of ceramics on the ballistic robustness of protective structures is shown. Structural and technological solutions aimed at increasing the survivability and ensuring the mounting of ceramic-containing structures on the ship are presented. Conclusion. The high efficiency of ceramics use in ship structures for protection against the impact of high-speed damaging elements is demonstrated. The use of ceramics in protective structures allows to get a significant increase in the ballistic robustness of structures while ensuring their ballistic survivability.

Detection System for Scratch on the Wheel Tread of Train Based on PSD

2012 ◽  
Vol 249-250 ◽  
pp. 9-14
Author(s):  
Ping He ◽  
Ying Li ◽  
Yuan Guo ◽  
Pan Li
Keyword(s):  
Human Computer Interaction ◽  
High Precision ◽  
High Speed ◽  
High Efficiency ◽  
Detection System ◽  
High Reliability ◽  
Computing System ◽  
Machine Interface ◽  
Moving Train ◽  
Scratch Detection

At present, scratch on the wheel tread of train is detected mostly in low-speed circumstance in China. For this reason, a high-precision detection system for scratch on the wheel tread of train based on PSD which adapts to high-speed moving train is presented. Firstly, the principle of scratch detection based on PSD is given. Then, the acquisition and computing system for scratch on the wheel tread of train based on PSD is designed with TMS320F2812. Finally, the human-computer interaction system based on Visual Studio 6.0 is designed. The results show that the detection system for scratch on the wheel tread of train based on PSD can realize detection for scratch on the wheel tread of train and have advantages of high precision, high efficiency, high reliability and well human-machine interface.

Piezoelectric β-polymorph formation of new textiles by surface modification with coating process based on interfacial interaction on the conformational variation of poly (vinylidene fluoride) (PVDF) chains

2020 ◽  
Vol 91 (3) ◽  
pp. 31301
Author(s):  
Nabil Chakhchaoui ◽  
Rida Farhan ◽  
Meriem Boutaldat ◽  
Marwane Rouway ◽  
Adil Eddiai ◽  
...  
Keyword(s):  
High Efficiency ◽  
Vinylidene Fluoride ◽  
Research Work ◽  
Research Area ◽  
Interfacial Interaction ◽  
Tetraethyl Orthosilicate ◽  
Poly Vinylidene Fluoride ◽  
Carbon Nanofillers ◽  
The Impact ◽  
Advanced Applications

Novel textiles have received a lot of attention from researchers in the last decade due to some of their unique features. The introduction of intelligent materials into textile structures offers an opportunity to develop multifunctional textiles, such as sensing, reacting, conducting electricity and performing energy conversion operations. In this research work nanocomposite-based highly piezoelectric and electroactive β-phase new textile has been developed using the pad-dry-cure method. The deposition of poly (vinylidene fluoride) (PVDF) − carbon nanofillers (CNF) − tetraethyl orthosilicate (TEOS), Si(OCH2CH3)4 was acquired on a treated textile substrate using coating technique followed by evaporation to transform the passive (non-functional) textile into a dynamic textile with an enhanced piezoelectric β-phase. The aim of the study is the investigation of the impact the coating of textile via piezoelectric nanocomposites based PVDF-CNF (by optimizing piezoelectric crystalline phase). The chemical composition of CT/PVDF-CNC-TEOS textile was detected by qualitative elemental analysis (SEM/EDX). The added of 0.5% of CNF during the process provides material textiles with a piezoelectric β-phase of up to 50% has been measured by FTIR experiments. These results indicated that CNF has high efficiency in transforming the phase α introduced in the unloaded PVDF, to the β-phase in the case of nanocomposites. Consequently, this fabricated new textile exhibits glorious piezoelectric β-phase even with relatively low coating content of PVDF-CNF-TEOS. The study demonstrates that the pad-dry-cure method can potentially be used for the development of piezoelectric nanocomposite-coated wearable new textiles for sensors and energy harvesting applications. We believe that our study may inspire the research area for future advanced applications.

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