scholarly journals Design of a New Stress Wave-Based Pulse Position Modulation (PPM) Communication System with Piezoceramic Transducers

Sensors ◽  
2019 ◽  
Vol 19 (3) ◽  
pp. 558 ◽  
Author(s):  
Aiping Wu ◽  
Sihong He ◽  
Yali Ren ◽  
Ning Wang ◽  
Siu Ho ◽  
...  
Keyword(s):  
Stress Wave ◽  
Communication System ◽  
Drill String ◽  
Stress Waves ◽  
Stress Wave Propagation ◽  
Pulse Position Modulation ◽  
System A ◽  
Voltage Signal ◽  
Electric Signals ◽  
Piezoceramic Transducer

Stress wave-based communication has great potential for succeeding in subsea environments where many conventional methods would otherwise face excessive difficulty, and it can benefit logging well by using the drill string as a conduit for stress wave propagation. To achieve stress wave communication, a new stress wave-based pulse position modulation (PPM) communication system is designed and implemented to transmit data through pipeline structures with the help of piezoceramic transducers. This system consists of both hardware and software components. The hardware is composed of a piezoceramic transducer that can generate powerful stress waves travelling along a pipeline, upon touching, and a PPM signal generator that drives the piezoceramic transducer. Once the transducer is in contact with a pipeline surface, the generator integrated with an amplifier is utilized to excite the piezoceramic transducer with a voltage signal that is modulated to encode the information. The resulting vibrations of the transducer generates stress waves that propagate throughout the pipeline. Meanwhile, piezoceramic sensors mounted on the pipeline convert the stress waves to electric signals and the signal can be demodulated. In order to enable the encoding and decoding of information in the stress wave, a PPM-based communication protocol was integrated into the software system. A verification experiment demonstrates the functionality of the developed system for stress wave communication using piezoceramic transducers and the result shows that the data transmission speed of this new communication system can reach 67 bits per second (bps).

THE REDUCTION OF STRESS WAVE PROPAGATION THROUGH POROUS MATERIALS

2008 ◽  
Vol 22 (09n11) ◽  
pp. 1215-1220
Author(s):  
SOTO AKI KIDA ◽  
KEITA FUKUSHIMA ◽  
MASAYA MATSUMOTO
Keyword(s):  
Porous Medium ◽  
Porous Materials ◽  
Stress Wave ◽  
Acrylic Resin ◽  
Wave Theory ◽  
Stress Waves ◽  
Stress Wave Propagation ◽  
Impact Stress ◽  
The Impact ◽  
Impact Stress Wave

Impact stress wave propagating through porous materials is investigated in order to examine the ability of the shock absorbing effect. The specimens are modeled as the porous medium with different porous diameters made of the acrylic resin plate. When these models are impacted with different impact velocities, the impact stress waves propagating before and after the porous parts are measured using the strain gages in the experiments. As the reduction effect of the impact stress wave propagating in the porous medium, we pay attention to the maximum stresses and the duration times from the histories of the impact stress waves. One-dimensional wave theory and dynamic element method simulated this model are applied in order to explain these phenomena.

The Micro-Mechanism of Vibration Cutting Stress Wave and the Analysis of Macro-Processing Effect

2009 ◽  
Vol 407-408 ◽  
pp. 632-635
Author(s):  
Jia Yao ◽  
Wei Lu ◽  
Chun Shan Liu
Keyword(s):  
Finite Element Method ◽  
Stress Intensity Factor ◽  
Wave Propagation ◽  
Stress Wave ◽  
Dynamic Stress ◽  
Dynamic Stress Intensity Factor ◽  
Shear Angle ◽  
Stress Waves ◽  
Stress Wave Propagation ◽  
Vibration Cutting

The specification of the vibration cutting loading is a decision factor for the generation of stress wave and the stress wave propagation has a significant impact on its micro-mechanism. Making the stress waves’ generation in the cutting area of vibration cutting for entry point, the analysis of internal inflection wave, inflection fracture and dynamic stress intensity factor has been carried out, the simulation of vibration cutting has also been done by finite element method, the essential of energy concentrated role, shear angle increment and cutting quality improvement has been explained.

scholarly journals Measurement of Stress Waves Propagation in Percussive Drilling

Sensors ◽  
2021 ◽  
Vol 21 (11) ◽  
pp. 3677
Author(s):  
Diego Scaccabarozzi ◽  
Bortolino Saggin
Keyword(s):  
Stress Wave ◽  
Axial Stress ◽  
Element Model ◽  
Stress Waves ◽  
Stress Wave Propagation ◽  
Drill Bit ◽  
Torsional Vibrations ◽  
Flexural Stress ◽  
Percussive Drilling ◽  
The Impact

This work describes the results of a test campaign aimed to measure the propagation of longitudinal, torsional, and flexural stress waves on a drill bit during percussive rock drilling. Although the stress wave propagation during percussive drilling has been extensively modeled and studied in the literature, its experimental characterization is poorly documented and generally limited to the detection of the longitudinal stress waves. The activity was performed under continuous drilling while varying three parameters, the type of concrete, the operator feeding force, and the drilling hammer rotational speed. It was found that axial stress wave frequencies and spectral amplitudes depend on the investigated parameters. Moreover, a relevant coupling between axial and torsional vibrations was evidenced, while negligible contribution was found from the bending modes. A finite element model of the drill bit and percussive element was developed to simulate the impact and the coupling between axial and torsional vibrations. A strong correlation was found between computed and measured axial stress spectra, but additional studies are required to achieve a satisfactory agreement between the measured and the simulated torque vibrations.

The Effect of Plate Curvature on the Influence of Macroscale Geometric Voids in Controlling Stress Wave Propagation

2020 ◽  
Author(s):  
C. S. Florio
Keyword(s):  
Wave Propagation ◽  
Stress Wave ◽  
Plane Stress ◽  
Cylindrical Shells ◽  
Reaction Force ◽  
Stress Waves ◽  
Stress Wave Propagation ◽  
Axial Impact ◽  
Plate Curvature ◽  
Metal Plates

Abstract Much work has been done to create and understand means to control the propagation of acoustic and light waves through materials and structures. The ability to perform similar studies on the control of stress waves has implications not only for the development of capabilities to disrupt stress waves in order to limit their damage, but also to direct stress waves in order to tailor the behavior of a structure for a specific functional goal. Recent studies have demonstrated the use of voids and inclusions of varying size, geometry, arrangement, and composition in structures to attenuate impact forces or cloak stress waves in thin, flat, plane stress plates. However, many structures that may benefit from these wave modification methods are comprised of cylindrical shells. It is not currently known how well the techniques to control wave propagation and trends identified in plane stress plates can be applied to structures with cylindrical shells. Therefore, this study develops and uses computational modeling methods to examine the modification and control of stress waves induced by an axial impact load in metal plates of varying curvature through the inclusion of macroscale voids. Methods are developed and used in this work to study the response of metal plates of varying curvature with and without voids of different shapes and arrangement to axial impact loads. The response is quantified through the magnitude of the fixed end reaction force and through normal oscillations of discrete points along the length of the plate. Fast Fourier transformation and wavelet coherence techniques are used to understand both the time-averaged and time-dependent oscillation behavior. Correlations are drawn between plate curvature and void design on the control of the propagation of stress waves. The knowledge gained can help guide the understanding design of these stress wave modification features.

Numerical Simulation of Stress Wave Propagation Induced by Cut Blasting in Multi-Media

2012 ◽  
Vol 249-250 ◽  
pp. 22-25
Author(s):  
Guo Liang Yang ◽  
Ren Shu Yang ◽  
Chuan Huo ◽  
Yu Long Che
Keyword(s):  
Numerical Simulation ◽  
Stress Wave ◽  
Strong Shock ◽  
Simulation Method ◽  
Stress Waves ◽  
Stress Wave Propagation ◽  
Weathered Rock ◽  
Plastic Damage ◽  
Multi Media ◽  
Set Up

Explosive blasting in rock and other media could induce strong shock wave. Near blasting zone, the blasting energy mainly break rock. Slightly far away from borehole, the blasting energy induces plastic damage. Farther afield, this kind of energy presents elastic deformation. In cut blasting, multi-boreholes initiate at the same time, multi-column stress waves occur superimpose and converge. Especially in multi-media, this process is extremely complex. Adopt numerical simulation method, set up multi-media model, which include weathered rock, highly weathered rock and plain fill. This paper simulated the propagation process of stress wave in these medias. Revealed the propagation mechanics of stress wave.

scholarly journals Subsection Forward Modeling Method of Blasting Stress Wave Underground

2015 ◽  
Vol 2015 ◽  
pp. 1-9
Author(s):  
Bo Yan ◽  
Xinwu Zeng ◽  
Yuan Li
Keyword(s):  
Finite Element ◽  
Stress Wave ◽  
Source Region ◽  
Stress Waves ◽  
Nonlinear Finite Element ◽  
Stress Wave Propagation ◽  
Local Structures ◽  
Nonlinear Responses ◽  
Induced Stress ◽  
Material Nonlinear

The generation of stress waves induced by explosions underground is governed by material nonlinear responses of materials surrounding explosions and affected by source region mediums and local structures. A nonlinear finite element (NFE) method can simulate the generation efficiently. However, the calculation using the NFE to observational distances, where motions are elastic, is computationally challenging. In order to tackle this problem, we present a subsection numerical simulating method for forward modelling the generation and propagation of stress waves with a hybrid method coupling the NFE and a linear finite element (LFE). The subsection idea is developed based on previous works; calculating steps of the subsection method as well as techniques of passing motions from a source region to an elastic region are discussed. 3D numerical simulations of stress wave propagation in rock generated by decoupled explosion underground with two methods for comparison are carried out. The accuracy of the subsection method is demonstrated with simulated results. The demand of PC memory and the calculating time are investigated. The subsection method provides another approach for modeling and understanding the generation and propagation of explosion-induced stress waves, though, currently, studies are preliminary.

Stress Wave Propagation, Dynamic Material Response, and Quantitative Non-Destructive Evaluation

1985 ◽  
Vol 38 (10) ◽  
pp. 1276-1278 ◽  
Author(s):  
R. J. Clifton
Keyword(s):  
Wave Propagation ◽  
Dynamic Loading ◽  
Stress Wave ◽  
Stress Waves ◽  
Ultrasonic Waves ◽  
Material Behavior ◽  
Stress Wave Propagation ◽  
Reliable Determination ◽  
Wide Range

Stress wave propagation is of fundamental importance in modern technology because it provides the primary means for the nondestructive examination of defects and in-homogeneities in opaque materials and the only means for studying the response of materials under the dynamic loading conditions associated with impact and explosions. Advances in such diverse technologies as nuclear reactor safety, integrated circuit inspection, and armor penetration depend strongly on advances in the modeling of the propagation of stress waves and in the improved characterization of the dynamic response of materials. Stress waves play a central role in a wide range of geotechnical and geophysical applications including reservoir exploration, earthquake monitoring, and the prediction of ground motion due to earthquakes and blast loading. Because of the inherent complexity of stress waves in solids (i.e., three wave speeds, anisotropy, and inhomogeneity), as well as the importance of nonlinearity in applications involving intense loading, progress in the modeling of stress wave phenomena depends critically on large scale computations. Increased availability of supercomputers provides an excellent opportunity for advances in the modeling of three dimensional phenomena, including such complicating features as anisotropy, inhomogeneity, defects, nonlinearity, and sliding interfaces. Research is needed on accurate and efficient algorithms for these calculations and for acoustic imaging which requires algorithms for inverse problems in which the size and shape of defects, as well as variations in density and in elastic moduli, are to be obtained by probing the region of interest with ultrasonic waves. Improved characterization of the sources and receivers of ultrasound is essential for reliable determination of the required geometrical features and material properties. Improved understanding of the dynamic inelastic response of materials is crucial to realizing the full benefits of the emerging computational power. Strain rate sensitivity, shear strain localization, crack propagation, twinning, and phase transformations are all aspects of mechanical response that need to be modeled in many dynamic loading applications. Basic experiments on these aspects of material behavior combined with computer simulation of the experiments should lead to significant progress in understanding the underlying mechanisms and, thereby, to improved models for use in computations.

scholarly journals A Numerical and Experimental Aproach of Stress Waves Propagation in Short Tronconical Bars Under Axial Impact

2018 ◽  
Vol 24 (3) ◽  
pp. 101-106
Author(s):  
Nicolae Iliescu ◽  
Vasile Nastasescu ◽  
Ghiță Barsan
Keyword(s):  
Wave Propagation ◽  
Numerical Analysis ◽  
Stress Wave ◽  
Cross Sections ◽  
Stress Waves ◽  
Stress Wave Propagation ◽  
Experimental Investigations ◽  
Axial Impact ◽  
Calculation Methodology ◽  
Waves Propagation

Abstract In the first part of the paper, using the numerical simulations with FEM and the results of some investigations made with different experimental techniques, a calculation methodology was developed for the study of the stress waves propagation in the short tronconical bars subjected at axial impact. Because a good agreement between data obtained from numerical analysis and experimental investigations was observed, the numerical model of calculus conceived for this study was considered validated. The calculus model established was used to investigate other aspects connected of stress wave propagation in the short tronconical bars. In the second part of the paper, using established calculus model and numerical analysis with Finite Element Method the influence of bar conicity on stress wave propagation and on stress distribution in different cross sections of the bar was analyzed

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