scholarly journals Delay Pressure Detection Method to Eliminate Pump Pressure Interference on the Downhole Mud Pressure Signals

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Yue Shen ◽  
Ling-Tan Zhang ◽  
Shi-Li Cui ◽  
Li-Min Sheng ◽  
Lin Li ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Pressure Sensor ◽  
Pressure Wave ◽  
Detection Method ◽  
Signal Reconstruction ◽  
Pressure Sensors ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Pump Pressure ◽  
Mud Pressure

The feasibility of applying delay pressure detection method to eliminate mud pump pressure interference on the downhole mud pressure signals is studied. Two pressure sensors mounted on the mud pipe in some distance apart are provided to detect the downhole mud continuous pressure wave signals on the surface according to the delayed time produced by mud pressure wave transmitting between the two sensors. A mathematical model of delay pressure detection is built by analysis of transmission path between mud pump pressure interference and downhole mud pressure signals. Considering pressure signal transmission characteristics of the mud pipe, a mathematical model of ideal low-pass filter for limited frequency band signal is introduced to study the pole frequency impact on the signal reconstruction and the constraints of pressure sensor distance are obtained by pole frequencies analysis. Theoretical calculation and numerical simulation show that the method can effectively eliminate mud pump pressure interference and the downhole mud continuous pressure wave signals can be reconstructed successfully with a significant improvement in signal-to-noise ratio (SNR) in the condition of satisfying the constraints of pressure sensor distance.

An Innovative Technology for Measuring The Dynamic Characteristics of Pressure Sensors

2006 ◽  
Vol 505-507 ◽  
pp. 1057-1062 ◽  
Author(s):  
Ho Chang ◽  
Mu Jung Kao ◽  
Tsing Tshih Tsung ◽  
J.L. Wu
Keyword(s):  
Dynamic Characteristics ◽  
Spectrum Analysis ◽  
Pressure Sensor ◽  
High Frequency ◽  
Pressure Wave ◽  
Hydraulic System ◽  
Output Voltage ◽  
Pressure Sensors ◽  
Innovative Technology ◽  
Wave Generator

This study developed a square-like pressure wave generator as an excitation source to test dynamic characteristics of pressure sensors. The developed generator can generate a square-like pressure wave of as high as 2 kHz and can achieve high-frequency switching by utilizing the differential principle through a series of mechanical rotations between the revolving spindle and revolving ring. The square-like pressure wave generated is input into the hydraulic system while the output voltage signals given by the pressure sensor can be analyzed by spectrum analysis to obtain dynamic characteristics of the pressure sensor

scholarly journals An Internal Model-Based PID Control for Smart Shot Peening Operation

2021 ◽  
pp. 15-33
Author(s):  
V. B. Nguyen ◽  
T. Ba ◽  
A. Teo ◽  
K. Ahluwalia ◽  
A. Aramcharoen ◽  
...  
Keyword(s):  
Control System ◽  
Pid Control ◽  
Shot Peening ◽  
System Development ◽  
Pressure Sensors ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Model Based ◽  
Extreme Gradient Boosting ◽  
Site Control

Current control systems for the shot peening operation merely rely on old technologies, which often require repetitive processes to obtain pre-validated Almen systems to guide industrial productions. These designs for the manufacturing paradigm are not efficient for complicated workflows in modern manufacturing operation. Thus, in this study, we propose a practical model-based control system to address the issues; especially for a smarter and automated shot peening machine. In particular, the closed-loop control system development utilizes a model-based proportional-integral-derivative (PID) control technology and extreme gradient boosting (XGBOOST) machine learning algorithm. The control system includes an internal process model, a proxy model, a model-based PID controller, and pressure sensors with a low-pass filter for feedback control. The developed control system is integrated into a physical shot peening machine for on-site control validation and demonstration. In both in-silico and on-site control demonstrations, the obtained control performance is stable, robust, and reliable for different operational conditions. The measurement intensities are very close to targeted setting intensities. All the differences are smaller than the industrial threshold of (±0.01 mmA). It implies that the control system can use in industrial peening operations without the need for Almen system development for operational guidance. In other words, the control system can significantly reduce the total cost of the actual production by eliminating the cost, time, and labor of the iterative trials to build the Almen system.

scholarly journals Improved harmonic detection method based on ip-iq theory

2021 ◽  
Vol 261 ◽  
pp. 01028
Author(s):  
Zhisen Yao ◽  
Guige Gao
Keyword(s):  
Detection Method ◽  
Phase Error ◽  
Response Speed ◽  
Detection Accuracy ◽  
Harmonic Detection ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Low Pass ◽  
In Series ◽  
Filtering Effect

Based on the traditional ip-iq harmonic detection theory, the accuracy of harmonic detection is easily affected by the phase-locked loop (PLL) output phase error, and the single low-pass filter (LPF) detection accuracy and filtering effect cannot be simultaneously. In this paper, an improved harmonic detection method based on the second-order generalized integrator-frequency locked loop (SOGI-FLL) technique is proposed to generate sine and cosine signals with the same frequency as the grid voltage; The traditional low-pass filter and average filter are used in series to improve the response speed and accuracy. Through theoretical analysis of the improved harmonic detection method and simulation in MATLAB environment, the theory and simulation results prove the effectiveness of the improved method.

scholarly journals Sloshing Simulation of Single-Phase and Two-Phase SPH using DualSPHysics

Kapal ◽  
2020 ◽  
Vol 17 (2) ◽  
pp. 50-57
Author(s):  
Andi Trimulyono ◽  
S Samuel ◽  
Muhammad Iqbal
Keyword(s):  
Free Surface ◽  
Pressure Sensors ◽  
Pressure Oscillation ◽  
Particle Method ◽  
Surface Flow ◽  
Particle Methods ◽  
Two Phase ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Low Pass

The sloshing phenomenon is one of the free surface flow that can endanger liquid cargo carriers such as ships. Sloshing is defined as the resonance of fluid inside a tank caused by external oscillation. When sloshing is close to the natural frequency of the tank it could endanger ships. Particle method has the advantages to be applied because sloshing is dealing with free surface. One of the particle methods is Smoothed Particle Hydrodynamics (SPH). In this study, compressible SPH was used as a result of the pressure oscillation, which exists because of the effect of density fluctuation as nature of weakly compressible SPH. To reduce pressure noise, a filtering method, Low Pass Filter,  was used to overcome pressure oscillation. Three pressure sensors were used in the sloshing experiment with a combination of motions and filling ratios. Only one pressure sensor located in the bottom was used to validate the numerical results. A set of SPH parameters were derived that fit for the sloshing problem. The SPH results show a good agreement with the experiment’s. The difference between SPH and experiment is under 1 % for sway, but a larger difference shows in roll. Low pass filter technique could reduce pressure noise, but comprehensive method needs to develop for general implementation.

TECHNIQUE OF APPLICATION FOR PROCESSING OF LOW PASS FILTER LF SIGNALS

10.12737/7905 ◽  
2015 ◽  
Vol 7 (4) ◽  
pp. 35-38
Author(s):  
Табаков ◽  
Yu. Tabakov ◽  
Лавлинский ◽  
V. Lavlinskiy
Keyword(s):  
Mathematical Model ◽  
Block Diagram ◽  
Low Frequency ◽  
Frequency Signal ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Low Pass ◽  
The Mathematical Model ◽  
40 Hz

The article includes a block diagram and the mathematical model for low pass filter designed for processing low frequency signal with a frequency of 10-40 Hz in order of eliminate various noises and interference.

scholarly journals A rapid harmonic detection method for grid-connected photovoltaic when three-phase voltage is unbalanced

2021 ◽  
Author(s):  
Tiezhou Wu ◽  
An Wang ◽  
Yawen Xu
Keyword(s):  
Phase Angle ◽  
Detection Method ◽  
Positive Sequence ◽  
Harmonic Detection ◽  
Phase Voltage ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Negative Sequence ◽  
Three Phase ◽  
Low Pass

Abstract By using power electronic devices, photovoltaic grid-connected power generation may inject harmonics into the power system. As the photovoltaic grid-connected inverter has the same basic structure as the active power filter, so the unified control of the photovoltaic grid and active filtering can be achieved. When the current unified control system compensates harmonics of the grid side, it mainly uses ip-iq harmonic detection method, which is based on instantaneous reactive power theory. When the three-phase voltage is unbalanced, the method has a large voltage phase angle detection error and the signal of the low-pass filter tracking system is long, detection time delay and even failure occur. This paper proposes an improved fast harmonic detection method. When phase deviation or amplitude change occurs to the three-phase voltage, the positive and negative-sequence voltages are simultaneously park transformed. The negative-sequence component is filtered by the current average module to obtain the fundamental amount of the voltage, then the phase angle of the positive-sequence voltage is accurately calculated to improve the harmonic current detection accuracy. Through the study of the integral method, it is found that the least common multiple of each harmonic period can be used as the integral interval, and the integral value is also zero, so the detection delay time is reduced by replacing the low-pass filter with an integration module. The simulation results show that the proposed harmonic detection algorithm can accurately detect harmonics when the three-phase voltage is unbalanced, and about 0.057 s improve the harmonic detection speed compared with the commonly used ip-iq method.

Based on System Delay Time to Compensate for Harmonic Current Detection Method Research

2012 ◽  
Vol 614-615 ◽  
pp. 953-956
Author(s):  
Xin Yao ◽  
Zai Lin Yao ◽  
Xin Ying Teng
Keyword(s):  
Reactive Power ◽  
Detection Method ◽  
Matlab Simulation ◽  
System Delay ◽  
Harmonic Current ◽  
Harmonic Compensation ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Low Pass ◽  
Pros And Cons

Harmonic detection is one of the most important core part of Active Power Filter,which can quickly and accurately detect the harmonic current that is the premise of circuit to quickly output harmonic compensation current,therefore the pros and cons of the detection method,a direct impact on the effect of harmonic compensation.Time compensation method is to add a specific time compensation angle based on the method of instantaneous reactive power compensation,so that it can accurately detect the harmonic currents at the same time,minimize the low-pass filter time delay.By MATLAB simulation,the results show high detection accuracy.And to ensure detection and compensation,while fully to improve the real-time function of the filter.

scholarly journals An Improved ip − iq Harmonic Detection Method Based on Time-Varying Integral Duration

2020 ◽  
Vol 2020 ◽  
pp. 1-9
Author(s):  
Jifang Li ◽  
Jidong Wang ◽  
Kunlin Song ◽  
Zhen Feng
Keyword(s):  
Detection Method ◽  
Integration Time ◽  
Detection Accuracy ◽  
Harmonic Suppression ◽  
Harmonic Detection ◽  
Response Delay ◽  
Harmonic Current ◽  
Harmonic Compensation ◽  
Pass Filter ◽  
Low Pass Filter

By analyzing harmonic related to instantaneous active current and instantaneous reactive current, we propose an improved harmonic detection method to remedy long response delay and low detection accuracy corresponding to harmonic of power system. This method introduces a series connection scheme composed of Low-Pass Filter (LPF) and a current average module firstly. Then, detection accuracy of harmonic current is enhanced by adaptive tuning cut-off frequency of LPF and integration time which was obtained by proposed algorithm of the current average module. Moreover, feedback loop is introduced to compensated delay caused by LPF. Simulations including uncontrollable rectifier and three-phase voltage type inverter show proposed method has many advantages such as high detection accuracy, low response delay and good generality. Our method provides reliable harmonic current detection for later harmonic suppression and harmonic compensation.

scholarly journals An FBG Strain Sensor-Based NPW Method for Natural Gas Pipeline Leakage Detection

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Qingmin Hou
Keyword(s):  
Natural Gas ◽  
Pressure Sensor ◽  
Detection Method ◽  
Pressure Sensors ◽  
Gas Pipeline ◽  
Strain Sensors ◽  
Leakage Detection ◽  
Large Signal ◽  
Natural Gas Pipeline ◽  
Signal Attenuations

Natural gas pipeline leaks can lead to serious and dangerous accidents that can cause great losses of life and property. Therefore, detecting natural gas pipeline leaks has always been an important subject. The negative pressure wave (NPW) method is currently the most widely used leakage detection method. Generally, this method uses pressure sensors to detect NPW signals to assess the leak and determine the location of the leakage point. However, the installation of a pressure sensor requires penetrating the pipeline structure, so the sensor intervals are often distant, leading to large signal attenuations and the ineffective detection of small leaks. An NPW method based on fiber Bragg grating (FBG) strain sensors is proposed in this paper which detects NPWs by monitoring the annular strain of the pipeline. Moreover, due to the advantages of nondestructive installation FBG strain sensors can be arranged closer along the distance of the pipeline, the attenuation of the NPW is small and the detection of leaks is improved. This method is tested through experiments and compared with a pressure sensor-based method; the experimental results verify that the proposed method is more effective in detecting natural gas pipeline leaks.

Delay pressure detection method to eliminate pump pressure interference on the downhole mud pressure signals

2013 ◽  
pp. 405-408 ◽  
Author(s):  
Yue Shen ◽  
Lingtan Zhang ◽  
Shili Cui ◽  
Yinao Su ◽  
Limin Sheng ◽  
...  
Keyword(s):  
Detection Method ◽  
Pump Pressure ◽  
Mud Pressure
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