A Study on Vibration Measurement based on the Rotational Speed Sensor

2019 ◽  
Vol 68 (6) ◽  
pp. 755-760
Author(s):  
Eun-hye Choi
Keyword(s):  
Rotational Speed ◽  
Vibration Measurement ◽  
Speed Sensor

Stable Floating Drops of Liquid

1985 ◽  
Vol 107 (4) ◽  
pp. 530-533
Author(s):  
Peter Dransfield ◽  
D. C. Davis
Keyword(s):  
Rotational Speed ◽  
Ambient Conditions ◽  
Speed Sensor ◽  
Floating Drops

There are few reported situations in which a drop of liquid will remain intact in ambient conditions for an indefinite period of time. The paper describes a situation where this happens. The phenomenon was noticed during experiments concerned with the development of a novel rotational speed sensor. It proved to be a substantial rather than a passing occurrence.

Introduction to the Conception of Combustion Process Onboard Monitoring System

2014 ◽  
Vol 214 ◽  
pp. 83-93
Author(s):  
Andrzej Bieniek
Keyword(s):  
Monitoring System ◽  
Pressure Sensor ◽  
Rotational Speed ◽  
Fuel Injection ◽  
Combustion Engine ◽  
Combustion Process ◽  
Injection System ◽  
Fuel Injection System ◽  
Speed Sensor ◽  
Future Potential

This paper presents a conception of a system designed for monitoring combustion process in a multi-cylinder combustion engine. The proposed system is based on the application of a pressure sensor installed in one of the engine’s cylinders. The analysis of the combustion process in the remaining cylinders is possible as a result of analyzing the course of the rotational speed by means of a sensor with a large resolution integrated with engine control phase sensor. This paper presents results of the initial testing of its operation and results of research into a system named CPMOS (Combustion Process Onboard Monitoring System) dedicated to a self-ignition engine of an off-highway vehicle. The use of an algorithm which applies a synthesis of a pressure sensor signal and rotational speed sensor offers the possibility of gaining a reconstructed course of pressure in all cylinders in the engine. The proposed measurement of pressure in a cylinder not involving fuel injection system can provide more detailed information regarding the course of the combustion process in the particular cylinders. The proposed concept of the CPMOS system leads to a decrease in the overall system cost as a result of the application of a single pressure sensor in a single cylinder. The future potential application of the monitoring of the combustion in each cylinder can enable the improvement of the operating parameters of the cylinders as a result of optimizing the control of the fuel injection system, EGR system and systems used for limiting exhaust gases used in the vehicle.

Development of a dual-shaft propeller thruster equipped with rotational speed sensor for UVMS control

2013 ◽  
Vol 18 (3-4) ◽  
pp. 241-247 ◽  
Author(s):  
Radzi Bin Ambar ◽  
Shinichi Sagara ◽  
Takuya Yamaguchi
Keyword(s):  
Rotational Speed ◽  
Speed Sensor

scholarly journals Condition Monitoring of Centrifugal Pumps Based on Pressure Measurements

2019 ◽  
Vol 63 (2) ◽  
pp. 80-90
Author(s):  
Csanád Kalmár ◽  
Ferenc Hegedűs
Keyword(s):  
Condition Monitoring ◽  
Rotational Speed ◽  
Characteristic Curve ◽  
Vibration Measurement ◽  
Pressure Side ◽  
Pressure Measurements ◽  
Centrifugal Pumps ◽  
Angular Misalignment ◽  
Pressure Signal ◽  
Heavy Damage

The purpose of the present study is the investigation of condition of centrifugal pumps via pressure signals. Instead of vibration measurement on the housings that is widely used in industry, our method is based on pressure signal measurement on the pressure side of the pump. Fourier transforming such a signal can get us to make conclusions about the behavior of the pump. By changing the operating point along a characteristic curve, we can create waterfall diagrams that provide useful information about the pump at constant rotational speed. For example, it is possible to differentiate the mechanical and the hydrodynamical effects predicting the occurrence of many constructional failures (such as unbalance, angular misalignment, bearing misalignment, motor instability, etc.); thus, preventing heavy damage of the equipment.

scholarly journals Self-Powered Speed Sensor for Turbodrills Based on Triboelectric Nanogenerator

Sensors ◽  
2019 ◽  
Vol 19 (22) ◽  
pp. 4889 ◽  
Author(s):  
Chuan Wu ◽  
Chenxing Fan ◽  
Guojun Wen
Keyword(s):  
Power Supply ◽  
Rotational Speed ◽  
Light Emitting Diode ◽  
Working Environment ◽  
Triboelectric Nanogenerator ◽  
Light Emitting ◽  
Speed Sensor ◽  
Laboratory Test Results ◽  
Drilling Technology ◽  
Self Powered

Turbodrills play an important role in underground energy mining. The downhole rotational speed of turbodrills is one of the key parameters for controlling the drilling technology. Therefore, it is necessary to measure the rotational speed of the turbodrills in real time. However, there is no dedicated speed sensor for the working environment of turbodrills at present. Therefore, based on the working principle of triboelectric nanogenerator (TENG), a self-powered speed sensor which can measure the speed of the turbodrills is proposed in this study. Besides, since the sensor is self-powered, it can operate without power supply. According to the laboratory test results, the measurement error of the sensor is less than 5%. In addition, the self-powered performance of the sensor was also explored in this study. The test shows that the maximum generating voltage of the sensor is about 27 V, the maximum current is about 7 μA, the maximum power is about 2 × 10−4 W, and the generated electricity can supply power for ten LED (light-emitting diode), which not only meets the power supply requirements of the sensor itself, but also makes it possible to further power other underground instruments.

scholarly journals Increasing Wind Turbine Drivetrain Bearing Vibration Monitoring Detectability Using an Artificial Neural Network Implementation

2021 ◽  
Vol 11 (8) ◽  
pp. 3588
Author(s):  
Daniel Strömbergsson ◽  
Pär Marklund ◽  
Kim Berglund
Keyword(s):  
Wind Turbine ◽  
Rotational Speed ◽  
Training Data ◽  
Vibration Monitoring ◽  
Vibration Measurement ◽  
Indicator Values ◽  
Wind Turbine Gearbox ◽  
Bearing Failures ◽  
Artificial Neural ◽  
Condition Indicator

The highest costs due to premature failures in wind turbine drivetrains are related to defects in the gearbox, with bearing failures being overrepresented. Vibration monitoring has been identified as the primary tool to detect and diagnose these types of failures. However, late or no signs of the failures are still being reported. Artificial neural networks (ANNs) has been shown to favourably be used as a classifier of bearing failures to increase the detection and diagnosis performance, which requires labelled data when training for all types of considered failures. However, less work has been done with an ANN used to create descriptive functions of the vibration and turbine operation data relationship and thereby negating inherent variance in the vibration data and increasing the detectability when a defect appears. Therefore, this study utilizes the relationship between the rotational speed recorded during a vibration measurement and the calculated condition indicator values of specific bearing failures in three wind turbine gearbox failures. An ANN establishes a function between the rotational speed and condition indicator values with healthy training data collected before the failure occurred. Thereafter, whole datasets leading up to the changing of the gearboxes is used to predict the condition indicator values without the failure influence. The difference between the predicted and true values show an increased sensitivity of the detection in two cases of gearbox output shaft bearing failures as well as indicating a planet bearing failure which with the previous data had gone undetected.

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