Research on rotating speed measurement method of turbodrill based on tilt sensor

2020 ◽  
pp. 095440622094443
Author(s):  
Wu Chuan ◽  
Wen Guojun ◽  
Han Lei
Keyword(s):  
Measurement Error ◽  
Inclination Angle ◽  
Measurement Method ◽  
Periodic Signal ◽  
Drilling Process ◽  
Test Results ◽  
Rotating Speed ◽  
Speed Measurement ◽  
Geological Conditions ◽  
Tilt Sensor

The rotating speed of turbodrill is a key parameter for adjusting the drilling process, which needs to be measured in real time. Based on this, a new rotating speed measurement method used in downhole turbodrill based on the tilt sensor is proposed in this paper. The basic principle is that a periodic signal will be generated by the tilt sensor along with the turbodrill, and then the rotating speed can be obtained by using fast Fourier transform to analyze the output data. Test results show that the measurement error is related to the inclination angle of the borehole, that is, this method cannot be used when the inclination angle is less than 0.4 degrees, while the measurement error is less than 3.5% when the inclination angle is more than 0.4 degrees, which meets the practical requirements. Compared with traditional methods, this method will not be interfered by mud, geological conditions and downhole vibration, and it is also a non-contact measurement method, which is very suitable for downhole environment.

scholarly journals Design of a Centrifugal Force-Based Speed Sensor for Downhole Turbodrills

2018 ◽  
Vol 2018 ◽  
pp. 1-12 ◽  
Author(s):  
Chuan Wu ◽  
Huafeng Ding ◽  
Lei Han
Keyword(s):  
Centrifugal Force ◽  
Functional Relation ◽  
Signal Interference ◽  
Test Results ◽  
Drilling Tool ◽  
Rotating Speed ◽  
Speed Sensor ◽  
Speed Measurement ◽  
Measurement Devices ◽  
And Control

Turbodrill is an important type of drilling tool. Rotating speed is a key parameter to measure and control the efficiency of a turbodrill. Therefore, it is necessary to measure the rotating speed when a turbodrill is working under a well. However, current speed measurement devices and sensors cannot meet the requirements of the on-site downhole conditions due to many factors, including inadequate sealing, signal interference, difficult installation, and theoretical limitations. To break the aforementioned bottleneck, a new speed sensor used for turbodrills is designed based on the centrifugal force theory. In more detail, the measurement of the speed is performed based on a functional relation between the rotating speed and the centrifugal force of the turbodrill. Besides, the sensor was tested both in-lab and on-site. The test results illustrate that the measurement error is within ±4%, which meets the practical on-site conditions.

Study of Velocity Measurement Error Analysis and Improving Velocity Measurement Accuracy on High-Speed Train

2014 ◽  
Vol 596 ◽  
pp. 468-471
Author(s):  
Tao Hou ◽  
Duo Wang Fan ◽  
Hong Xia Niu
Keyword(s):  
Measurement Error ◽  
Error Analysis ◽  
Velocity Measurement ◽  
High Speed ◽  
Measurement Method ◽  
Measurement Accuracy ◽  
Measuring System ◽  
High Speed Train ◽  
Speed Measurement ◽  
Velocity Measuring

For the problem of a big velocity measurement error,analyzed the velocity measurement error and studied the method of improving velocity measurement accuracy for the velocity measuring system of high-speed train.In this analysis and method, the speed error analysis was carried out based on understand the characteristics of the high-speed train speed sensor, and found that there is a bigger error. Then discussed the influence of large errors of the control system, and then put forward the improved M/T speed measurement method to solve the error problem. Finally, calculated velocity-measuring error for the improved M/T speed measurement method. The results show that the accuracy of speed has improved greatly. The research method can improve the accuracy to meet the requiring of train safety and smooth run.

Feasibility investigation of a compressor rotor supported by gas foil bearings with inhomogeneous bump foils

2021 ◽  
pp. 135065012110046
Author(s):  
Hao Li ◽  
Haipeng Geng ◽  
Bo Wang ◽  
Wei Zheng
Keyword(s):  
Critical Speed ◽  
Rotor System ◽  
Experimental Result ◽  
Test Results ◽  
Rotating Speed ◽  
Foil Bearings ◽  
Dynamic Coefficients ◽  
High Order Harmonic ◽  
Compressor Rotor ◽  
Operating Points

In this paper, a rotordynamic experiment on a compressor rotor system is presented and the feasibility of gas foil bearings with inhomogeneous bump foils is verified. A push–pull device is designed to obtain the stiffness curve and the nominal clearance of foil bearings. Operating points and dynamic coefficients of the rotor system at each rotating speed are predicted. In rotordynamic analysis, an alternative model of the impeller is proposed and the critical speed is predicted by employing the finite element method, in which the dynamic coefficients of inhomogeneous foil bearings are taken into account. Compared with the experimental result, the accuracy of the prediction for the critical speed is verified to be about 14% error. Two sets of foil bearings with 22 and 41 μm nominal clearance are manufactured and tested. Test results indicate that the vibration amplitude can be greatly reduced by diminishing the bearing clearance. When foil bearings with 22 μm clearance are used, the high-order harmonic frequencies of rotor vibration are significantly inhibited, and the amplitude of the rotating frequency is obviously restricted. Thus, the foil bearing with inhomogeneous bump foils tested in this paper can meet the speed requirement of the compressor when the nominal clearance is set at 22 μm.

Inclined Loading Capacity of Embedded Suction Anchors in Clay

2009 ◽  
Author(s):  
Y. S. Kim ◽  
K. O. Kim ◽  
Y. Cho ◽  
S. Bang ◽  
K. D. Jones
Keyword(s):  
Analytical Solution ◽  
Model Test ◽  
Inclination Angle ◽  
Load Application ◽  
Centrifuge Model Test ◽  
Loading Capacity ◽  
Test Results ◽  
Pullout Capacity ◽  
Centrifuge Model ◽  
Inclined Loading

An analytical solution has been developed to estimate the inclined pullout capacity of an embedded suction anchor in clay seafloor. Validation has been made through comparisons with a limited number of centrifuge model test results. Results indicate that the inclined pullout capacity of an embedded suction anchor in clay decreases as the load inclination angle to the horizontal increases. As the point of the load application moves downward, the inclined pullout capacity increases, reaches its peak, and then starts to decrease.

Parallel Measurement Based on Laue Effect

2014 ◽  
Vol 716-717 ◽  
pp. 928-931
Author(s):  
Mei He Yang
Keyword(s):  
Equilibrium Point ◽  
Measurement Method ◽  
Testing Effect ◽  
Test Results ◽  
Basic Principles ◽  
Interference Measurement ◽  
Parallel Measurement ◽  
Transparent Materials ◽  
Point Detection

In the paper, interference measurement method for end surface parallel measurement of transparent materials is described. Firstly, basic principles of optical plane template equilibrium point detection are analyzed, measurement algorithms and formulas for calculating optical parallelism are proposed, then possible error of algorithm is analyzed in details, concrete plan for correcting the error is proposed, overall method for testing parallelism is proposed on the basis, and finally related experiment is designed for testing and analyzing the method. Test results show that the method can prominently improve precision of testing parallelism with excellent testing effect.

METHOD FOR DETERMINING THE LIMITS OF ELASTICITY AND PROPORTIONALITY OF MATERIALS FOR SUBSEQUENT DRILLING OF WORKPIECES IN THE STRESS–STRAIN STATE

2020 ◽  
Vol 3 ◽  
pp. 164-170
Author(s):  
V.V. KUTS ◽  
A.S. BYSHKIN ◽  
M.S. RAZUMOV
Keyword(s):  
Measurement Error ◽  
Elastic Deformation ◽  
Strain State ◽  
Drilling Process ◽  
Stress Strain ◽  
Workpiece Material ◽  
Stress Strain State ◽  
Urgent Task ◽  
Accuracy Of Measurement ◽  
Proportionality Limit

Drilling holes is one of the most common operations in the manufacture of parts. As a result, improving the efficiency of this process is an urgent task. To improve the efficiency of the drilling process, a method was developed at the Southwestern University for drilling with pre–stressed–deformed material of the workpiece, in which the sample is subjected to elastic deformation at a load that does not exceed the proportionality limit of the workpiece material, that is, when the load is removed, the dimensions of the workpiece remain the same. As part of this work, an experimental device was developed and designed to determine the limits of elasticity and proportionality of materials for subsequent drilling of workpieces in a stress–strain state. This invention will improve the automation and accuracy of measurement. An example of measurement and calculation is considered. Calculation formulas for determining the measurement error are given.

scholarly journals Analysis of influencing factors of flow state concrete mixture performance

2021 ◽  
Vol 2076 (1) ◽  
pp. 012073
Author(s):  
Dandan Shi ◽  
Xing Qin ◽  
Hao Qu
Keyword(s):  
Measurement Method ◽  
Engineering Application ◽  
Performance Testing ◽  
Reducing Agent ◽  
Mineral Admixture ◽  
Raw Material ◽  
Concrete Mixture ◽  
Flow State ◽  
Test Results ◽  
Concrete Mix

Abstract Based on the principle of benefiting the durability of concrete, machined sand is used to configure C40 flow concrete, and the engineering application environment and economy are considered. In this paper, the author through the flow state concrete mix ratio design, give the raw material dosage, concrete mixing, finally combined with the workability measurement method, five groups of concrete mix performance testing. According to the test results, the influence of mineral admixture and water reducing agent on the workability of concrete mixture is studied and analyzed, and the reasonable admixture dosage and water reducing rate of water reducing agent and its admixture dosage are finally given.

scholarly journals Optimized Blood Volume Monitoring during Hemodialysis Procedure based on Ultrasonic Speed Measurement

2019 ◽  
Vol 9 (3Jun) ◽  
Author(s):  
V. R Nafisi ◽  
M Eghbal
Keyword(s):  
Measurement Method ◽  
Water Volume ◽  
Critical Threshold ◽  
Ultrasonic Speed ◽  
Air Bubble ◽  
Clinical Complications ◽  
Speed Measurement ◽  
Ultra Filtration ◽  
Concentration Changes ◽  
Hemodialysis Machine

Fast reduction of blood water volume due to ultra-filtration via hemodialysis machine and critical threshold of blood water volume can result in clinical complications such as hypotension. When blood water volume reduces during hemodialysis process, the concentration of blood forming elements will increase. One of the methods for the monitoring of the concentration changes is ultrasonic speed measurement.In this paper, we optimize the ultrasonic speed measurement method in such a way that it would be compatible with conventional air detector in a hemodialysis machine. Air bubble detecting and the relative blood water volume estimating can be achieved by adding the “sing-around” ultrasonic speed measurement method to the current hemodialysis machine; air bubble detection is achieved by monitoring the decline in the ultrasonic wave amplitude (because of air bubbles) and the protein concentration measurement is achieved by measuring the transit time of the wave. Therefore, the optimized method can be applied to the air detection device of a hemodialysis machine.

scholarly journals The design of bottomhole assembly with two rock cutting tools for directional drilling

2018 ◽  
pp. 14-20
Author(s):  
I. V. Voievidko ◽  
V. V. Tokaruk ◽  
M. A. Bodzian
Keyword(s):  
Theoretical Analysis ◽  
Inclination Angle ◽  
Large Diameter ◽  
Cutting Tools ◽  
Intensity Variation ◽  
Rock Cutting ◽  
Hole Drilling ◽  
Directional Drilling ◽  
Geological Conditions ◽  
Technical Factors

On the basis of the theoretical analysis and practical studies of hole drilling of large diameter, a method for designing the BHA with two rock cutting tools is proposed, taking into account the geological and technical factors that have an impact on the formation of the trajectory. The calculation of BHA with two rock cutting tools and a different number of supporting and centralizing components for different geological conditions of drilling is carried out and the analysis of their work in the process of drilling is conducted. The graphic dependences of the deviation intensity variation and the inclination angle with the sinking of borehole of the large diameter for the BHA that can be used for the drilling of vertical and directional wells.

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