Способ обработки результатов магнитной дефектоскопии для достоверного обнаружения опасных дефектов сплошности в реальном времени

2020 ◽  
pp. 58-64
Author(s):  
А.Н. Печенков
Keyword(s):  
Magnetic Field ◽  
Inverse Problem ◽  
Inverse Problems ◽  
Computer Program ◽  
Real Time ◽  
High Precision ◽  
Computational Method ◽  
On Line ◽  
Definition Of ◽  
Minimization Of Functional

The inverse problems of magnetostatics for defects of a continuum can be formulated in various ways. It is possible to set a task of definition of defects with high precision and permission,or it is possible to limit the task to detection of several types of defects («dangerous» defects) with good probability. At the same time «small» defects will be passed by the computer program. The problem of minimization of functional for both experimental and computational magnetic field differences is the main problem for the solution of any inverse problem, both in on – line (real time), and in off - line modes. Computational method of calculations in real time of the simplified inverse problem, without accumulation of experimental databases is considered.

scholarly journals Uniquness of approximation calculations for multilayered density interfaces

2014 ◽  
pp. 69-73
Author(s):  
Yu. Dubovenko
Keyword(s):  
Inverse Problem ◽  
Inverse Problems ◽  
Initial Approximation ◽  
Analytical Models ◽  
Separation Theorems ◽  
Density Interface ◽  
Density Interfaces ◽  
Modeling Data ◽  
Definition Of ◽  
Field Separation

The goals of the paper are to obtain mathematical constructions for geological objects, such as synclines and anticlines; to substantiate the uniqueness of the inverse problem when renovating analytical models for the horizontally layered geological media with several density interfaces in contact surfaces predefined by Chorniy; and to try the techniques developed for their iterative calculation. A combination of these two models develops a new and more accurate approach to gravimetric inverse problems for the contact interface. This becomes necessary to improve standard fit procedures when solving inverse problems in gravity and magnetic fields. The inverse problem of the density interface in the horizontally layered geological media with several density interfaces is confined to the solution of the nonlinear integral equation that describes the contact surface restricted by the given constant asymptotes within the planar region. Still, this makes computation more complicated because of the problem of equivalency solutions. Two field separation theorems are proposed for this model – one for several 1-connected volumes and another one for the non-crossed layers. The theorems of uniqueness are built on the theorems of field separation enabling the solution of the inverse problem by the summary external gravity field of n objects (ore bodies, layer interfaces etc.) through the solution of the inverse problem for separate objects – by the appropriate field values from these geological objects. The numerical schemes for the definition of the initial approximation of the density interface in the multilayered geological media are stated. These algorithms formally coincide within the first iteration. There are also proposed analogical techniques based of the Chebyshev iteration construction for the iterative specification of the behavior of the contact asymptotes. There were modeled synthetic initial approximations of synclines and anticlines by these algorithms. An alternative calculus method for it is pointed out, which is based upon the definition of the different moments of the interface curves. For the integral calculation there is obtained an appropriate expression in the finite quadratures. Modeling data show that new analytical constructions for the calculation of the multilayered contact interfaces within their Newtonian numerical approximation converge more quickly in comparison with classic techniques for the contact definition. Their invariability for the big dimension field data should be tested on the real measurements. No attempts to apply rough approximations were successful: convergence was considerably less than in previous cases, and, besides, there was a rather ambiguous geological maintenance.

Noncontact Angle Measuring System Based on Laser and Capacitive Sensor

2011 ◽  
Vol 308-310 ◽  
pp. 469-472
Author(s):  
Yu Jun Feng ◽  
Zheng Ye Xiong ◽  
Yong Qiang Li ◽  
Cun You Huang ◽  
Wen Qing Shi ◽  
...  
Keyword(s):  
Real Time ◽  
High Precision ◽  
Capacitive Sensor ◽  
Measuring System ◽  
Blade Angle ◽  
Angle Measuring ◽  
On Line

Based on laser and capacitive sensor, a method of measuring deflectable angle is presented, and a noncontact angle measuring system is established. This system has the advantages of simple constitution, real-time, on-line measuring, non-contact and high precision. It can be widely used in engineering, especially in blade angle detection of knife and scissors.

Travel time(like) variables and the solution of velocity inverse problems

Geophysics ◽  
1984 ◽  
Vol 49 (6) ◽  
pp. 758-766 ◽  
Author(s):  
Frank G. Hagin ◽  
Samuel H. Gray
Keyword(s):  
Inverse Problem ◽  
Wave Equation ◽  
Inverse Problems ◽  
Travel Time ◽  
Arbitrary Point ◽  
Three Dimensions ◽  
Critical Position ◽  
Straight Line ◽  
Definition Of ◽  
Inversion Techniques

It was demonstrated earlier that, in the solution of 1-D inverse problems, there is great advantage to changing the independent variable from, say, z (depth) to travel time [Formula: see text]. Essentially the advantage comes from the fact that the acoustic wave equation in travel time has the unknown c(z) appearing in a less critical position. The current paper takes a step toward applying these ideas to the much harder, but more interesting, inverse problem in three dimensions. There is no simple 3-D analog of the above definition of τ. However, it is shown that a surprisingly effective way of decomposing travel time into x, y, z components is straightforward. These are defined via line integrals from, say, (0, 0, 0) to an arbitrary point (x, y, z) along the straight line connecting the points, thus approximating the more natural integrals along the unknown raypath. These line integrals define the new coordinates, and the associated wave equation is derived and then simplified by dropping less important terms. The inverse problem is then attacked in this setting using the 3-D inversion techniques of Cohen and Bleistein (1979). The resulting algorithm is demonstrated to be very similar to those earlier results; however, it is shown that for a single reflecting plane the new results are of “second‐order” accuracy as oppose to first order (when the change in c is small relative to c itself). The algorithm also has some similarity to that of Raz (1982), and some comparisons between these two results are made.

A Registration Algorithm of Sensor System Errors Based on Innovation Correlation

2012 ◽  
Vol 170-173 ◽  
pp. 2860-2863
Author(s):  
Pi Xu Zhang ◽  
Hang Yu Wang ◽  
Zhang Song Shi
Keyword(s):  
Correlation Function ◽  
Real Time ◽  
High Precision ◽  
Adaptive Filter ◽  
Sensor System ◽  
Registration Algorithm ◽  
On Line ◽  
System Errors ◽  
Function Sequence ◽  
Self Adaptive

In order to eliminate the influence of sensor system errors on detecting precision, the intersection of sensor locating globes is modeled with Earth-Center Earth-Fixed coordinates as transitional characters and to be eliminated, and a self-adaptive filter is presented to register sensor system errors for multi-platform, which identifies model characters and error characters on line by innovation correlation function sequence based on real-time mutual observation of platforms. Contrastive simulations against traditional registration algorithm show that the registration algorithm based on innovation correlation can converge quickly with high precision.

On-Line Control of Harmonic Oscillations in a Low-Frequency Resonant Mechanical Spectrometer

2006 ◽  
Vol 115 ◽  
pp. 299-304
Author(s):  
Leszek B. Magalas ◽  
A. Piłat
Keyword(s):  
Real Time ◽  
High Precision ◽  
Low Frequency ◽  
Control Unit ◽  
High Accuracy ◽  
Mechanical Loss ◽  
Harmonic Oscillations ◽  
Excitation Process ◽  
On Line ◽  
Short Time

The on-line control unit is used to ensure high-accuracy computations of the logarithmic decrement. It is shown that the excitation process should be on-line low level real-time controlled during mechanical loss measurements to obtain high precision of the computations and to ensure a short-time excitation process.

Adaptive Signal Analysis and Interpretation for Real-time Intelligent Patient Monitoring

1994 ◽  
Vol 33 (01) ◽  
pp. 60-63 ◽  
Author(s):  
E. J. Manders ◽  
D. P. Lindstrom ◽  
B. M. Dawant
Keyword(s):  
Computer Architecture ◽  
Real Time ◽  
Data Abstraction ◽  
Monitoring Strategy ◽  
Intelligent Monitoring ◽  
Patient Status ◽  
On Line ◽  
Main Components ◽  
And Control ◽  
Adaptive Signal

Abstract:On-line intelligent monitoring, diagnosis, and control of dynamic systems such as patients in intensive care units necessitates the context-dependent acquisition, processing, analysis, and interpretation of large amounts of possibly noisy and incomplete data. The dynamic nature of the process also requires a continuous evaluation and adaptation of the monitoring strategy to respond to changes both in the monitored patient and in the monitoring equipment. Moreover, real-time constraints may imply data losses, the importance of which has to be minimized. This paper presents a computer architecture designed to accomplish these tasks. Its main components are a model and a data abstraction module. The model provides the system with a monitoring context related to the patient status. The data abstraction module relies on that information to adapt the monitoring strategy and provide the model with the necessary information. This paper focuses on the data abstraction module and its interaction with the model.

A Real Time Control Architecture for Continuously Managing Patients in a Care Unit

1995 ◽  
Vol 34 (05) ◽  
pp. 475-488
Author(s):  
B. Seroussi ◽  
J. F. Boisvieux ◽  
V. Morice
Keyword(s):  
Real Time ◽  
Linear Time ◽  
Treatment Plan ◽  
Control Architecture ◽  
Real Time Control ◽  
Time Representation ◽  
Time Control ◽  
Continuous Support ◽  
Definition Of ◽  
Computerized System

Abstract:The monitoring and treatment of patients in a care unit is a complex task in which even the most experienced clinicians can make errors. A hemato-oncology department in which patients undergo chemotherapy asked for a computerized system able to provide intelligent and continuous support in this task. One issue in building such a system is the definition of a control architecture able to manage, in real time, a treatment plan containing prescriptions and protocols in which temporal constraints are expressed in various ways, that is, which supervises the treatment, including controlling the timely execution of prescriptions and suggesting modifications to the plan according to the patient’s evolving condition. The system to solve these issues, called SEPIA, has to manage the dynamic, processes involved in patient care. Its role is to generate, in real time, commands for the patient’s care (execution of tests, administration of drugs) from a plan, and to monitor the patient’s state so that it may propose actions updating the plan. The necessity of an explicit time representation is shown. We propose using a linear time structure towards the past, with precise and absolute dates, open towards the future, and with imprecise and relative dates. Temporal relative scales are introduced to facilitate knowledge representation and access.

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