Faults Diagnosis of Converter Transformer Based on the Vibration Method

2013 ◽  
Vol 712-715 ◽  
pp. 2101-2106
Author(s):  
Hong Cui
Keyword(s):  
Measuring System ◽  
Iron Core ◽  
Transmission Route ◽  
Test Results ◽  
Vibration Method ◽  
Vibration Condition ◽  
Faults Diagnosis ◽  
Vibration Measuring

The vibration of windings and iron core causes the overall vibration of the transformer. Significant changes of transformer vibration condition will take place when the windings or core has fault, so the vibration method can be used to diagnose the transformer's potential fault. The characteristics and transmission route of the transformers' vibration were analyzed. The vibration of a certain transformer in converter station was picked up, using vibration measuring system. The test results aree analyzed comparatively and maintenance suggestion was proposed.

Measurement and Analysis on Transient Thermal Characteristics of High Speed Motorized Spindle

2011 ◽  
Vol 52-54 ◽  
pp. 2021-2026
Author(s):  
Gui Ling Deng ◽  
Can Zhou
Keyword(s):  
High Speed ◽  
Thermal Deformation ◽  
Thermal Characteristics ◽  
Measuring System ◽  
Test Results ◽  
Motorized Spindle ◽  
Measurement And Analysis ◽  
Turning Center ◽  
Transient Thermal ◽  
Deformation Compensation

Thermal deformation is an important factor to affect the accuracy of the motorized spindle, the core component of high-speed machine tool. To understand the spindle system transient thermal characteristics of the high-speed turning center CH7516GS, some high-precision sensors and high-frequency data acquisition system is used to establish the temperature and displacement measuring system. The thermal deformation compensation model is established on the basis of the experimental test results.

scholarly journals Systemy umożliwiające identyfikację upadku z wysokości

2021 ◽  
Vol 601 (10) ◽  
pp. 17-21
Author(s):  
Marcin Jachowicz ◽  
◽  
Grzegorz Owczarek
Keyword(s):  
Image Analysis ◽  
Measuring System ◽  
Test Results ◽  
Acceleration Sensors ◽  
Calibration And Verification

The article discusses two types of systems developed at CIOP-PIB, which enable the identification of human falls from a height. The operation of the first system is based on an accelerometric measuring system implemented in the hip belt, which is an element of the equipment protecting against falls from a height. The operation of the second system is based on the analysis of the recorded video. The methods and results of calibration and verification tests of both designed systems, which were used for the preliminary tests, were presented. During these tests, the participant performed specific exercises: sitting down and simulating falling. The comparison of the test results showed a high convergence between the values measured with the acceleration sensors and the values obtained on the basis of the image analysis. The described systems can therefore be used for fall dentification and as initiators of devices for dynamic shortening of the fall path, which will reduce the forces acting on a person during restraining his fall from a height.

Investigation of Turbine Coolers Vibration Parameters

2003 ◽  
Author(s):  
Vladimir L. Simonov
Keyword(s):  
Air Conditioning ◽  
Technical State ◽  
Measuring System ◽  
Air Conditioning System ◽  
Vibration Parameters ◽  
Vibration Measuring ◽  
Angular Oscillations

Aviation turbine coolers (TC) are the main units in airplane air conditioning system. In this paper described are investigations aiming to estimate turbine coolers’ technical state using analysis of vibration parameters. In order to do this, an optoelectronic vibration-measuring system was designed. This system was intended for measurements of linear and / or angular oscillations of various points on housing and rotor of the turbine cooler. Appropriate software for vibration specters procession was created. Experiments were conducted in laboratory and plant conditions.

Development of Novel Tooth-Matching Linear Piezoelectric Actuator

2019 ◽  
Author(s):  
Po-Lin Huang ◽  
Jen-Yuan (James) Chang
Keyword(s):  
Finite Element ◽  
Piezoelectric Material ◽  
Piezoelectric Actuator ◽  
Element Model ◽  
Measuring System ◽  
Axial Deformation ◽  
Experiment Platform ◽  
Actuator System ◽  
Vibration Measuring

Abstract This paper proposes a new concept of piezoelectric actuator. It is different from ordinary piezoelectric actuators which are actuated by friction, and wear becomes a major problem in long-term use. The main purpose of this research is to drive the motor without friction. Hence, the actuator driven by resonance force is proposed here. The foundation of the actuator is based on piezoelectric material which possess the inverse piezoelectric effect itself. The axial deformation of piezoelectric material is worked as excitation here, which makes the stator subjected to mutative equivalent force along the time. At the same time, the input frequency of sinusoidal voltage is controlled and applied to the stators which makes the stators resonated and in contact with motor for pushing the motor forward. In addition to proposing the preliminary design concept of linear piezoelectric actuator, the dynamic model of the piezoelectric actuator system is firstly studied by Hamilton’s Principle. Then, the finite element method is used to calculate the modal analysis of stator. Finally, the prototype is fabricated and experiment platform is established. The vibration response of stators is measured by laser Doppler vibration measuring system, which is able to verify reasonableness of the constructed finite element model and feasibility of linear piezoelectric actuator.

Research on Sucker Rod Displacement Measuring Technology Based on Double Integral of Acceleration

2013 ◽  
Vol 718-720 ◽  
pp. 460-465
Author(s):  
Wang Zhan ◽  
Ming Long Xu ◽  
Bo Feng ◽  
Zeng Yong An
Keyword(s):  
Digital Filter ◽  
Serial Communication ◽  
Practical Work ◽  
Measuring System ◽  
Acceleration Process ◽  
Test Results ◽  
Double Integral ◽  
Process Data ◽  
Sucker Rod

In allusion to the disadvantages of sucker rod displacement measuring technologies at present, we introduce an inertial measuring technology in which the design of acceleration measuring system, the design of IIR digital filter and double integral algorithm play significant roles. Through combination of hardware and software, the embedded measuring system was developed to measure the acceleration, process data and realize the serial communication. In our practical work, some chips were used in this system, eg 1221L-002, ADS1259, MSP430F1611, MAX202, etc. The test results showed that the accuracy of the measuring system reached to 5%, which met the request for oilfield.

Monitoring of Landslide Slope Stability near Construction Facilities

2018 ◽  
Vol 931 ◽  
pp. 288-294
Author(s):  
Evgenia V. Uglova ◽  
Alexander S. Konorev ◽  
Olga V. Konoreva
Keyword(s):  
Slope Stability ◽  
Experimental Research ◽  
Dynamic Deformation ◽  
Frequency Characteristics ◽  
Measuring System ◽  
Structure Stability ◽  
Surface Vibrations ◽  
Landslide Slope ◽  
Vibration Measuring

The article dwells on the matters of monitoring of landslide slope stability near construction facilities. The procedure of field experimental research on landslide slopes and road structures thereon with the use of the vibration-measuring system was examined. The procedure of field experimental research on the sections with various levels of ground watering was described to detect differences in the characteristics of dynamic deformation of the landslide and stable sections of the slope. Amplitude-time characteristics of the vertical and tangential components of the surface vibrations on the microseism level and matching amplitude-frequency characteristics were obtained. The criteria of road structure stability on landslide sections of slopes were identified.

On the Analysis of Experimental Data for External Gear Machines and Their Comparison With Simulation Results

2007 ◽  
Author(s):  
Andrea Vacca ◽  
Germano Franzoni ◽  
Paolo Casoli
Keyword(s):  
Experimental Data ◽  
Simulation Models ◽  
Measuring System ◽  
Gear Pump ◽  
Test Results ◽  
Measuring Systems ◽  
Measuring Device ◽  
Delivery Pressure ◽  
Pressure Ripple ◽  
Simulation Results

This paper deals with the simulation of hydraulic gear machines, focusing on the validation of simulation models and on the comparison between numerical results and experimental data, concerning both steady and unsteady conditions. First authors give a brief overview on the simulation tool HYGESim, which has been presented and discussed in several previous papers. Afterwards, the attention shifts on the analysis of the simulation results for the case of a stock gear pump. Regarding steady state characteristics, the paper shows how HYGESim is able to accurately reproduce the operation of the analyzed pump, in terms of flow, pressures and efficiency maps. Regarding unsteady simulations, namely the delivery pressure ripple, the paper highlights the significant effort done by the authors in order to achieve experimental data clear and suitable for the comparison with simulation results. In fact, the peculiarities of common measuring systems (in particular of the load apparatus and the sampling methods) are often difficult to reproduce numerically: frequently different acceptable assumptions in the numerical model lead to remarkable discrepancies in simulated results. For this purpose, the authors developed a measuring device mainly focused on the easy reproducibility in the simulation environment. Furthermore, an original technique for processing unsteady data (pressure and flow ripples) is proposed, allowing to achieve comparable data indifferently of the adopted sampling method and of the data origin (experimental or numerical). In the final part of the paper, pressure ripple simulations and test results (obtained with the described measuring system and analyzed with the described technique) are presented and compared.

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