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Impulsiveness

Mechanical stretch tests were made with the speed of (0,3-3,0) 10" m/s and with the simultaneous registration of the AE signals. Number of the AE impulses (Nl ) and AE amplitude (A) were selected as the measurable parameters of the AE. [Pg.83]

If the impulse response function g(x) of a system is known, the output signal y(x) of the system is given for any input signal u(x). The integral equation, which is called superposition integral. [Pg.366]

The function g(x) is named impulse response of the system, because it is the response to an unit pulse 5(x) applied at =0 [2]. This unit impulse 5(x), also called Dirac impulse or delta-function, is defined as... [Pg.366]

Eq.(2) describes an impulse with the area of 1 [1-3]. Fig. 1 (left) shows such an unit impulse S(x) and an example for an impulse response g(x) at the output of the system. [Pg.366]

Often an unit impulse is not available as a signal to get the impulse response function g(x). Therefore an other characteristic signal, the unit step, is be used. [Pg.366]

The step response function h(x) is also determined by the integral equation (1). The relationship between step response h(x) and the impulse response g(x) is represented by... [Pg.366]

The superposition integral (1) corresponds to a division of the input signal u(x) into a lot of Dirac impulses 5 x). which are scaled to the belonging value of the input. The output of each impulse 5fx) is known as the impulse response g(x). That means, the output y(x) is got by addition of a lot of local shifted and scaled impulse responses. [Pg.366]

Fig. 1 (right) shows upside an example of an input. The marked points are some of the scaled Dirac impulses. The belonging scaled impulse responses are shown downside. [Pg.367]

Unit impulse fucnction Unit step function Example for an input signal 5(x) f s(x)f u( ),... [Pg.367]

Unit impulse response Unit step response responses for input example... [Pg.367]

The equation system of eq.(6) can be used to find the input signal (for example a crack) corresponding to a measured output and a known impulse response of a system as well. This way gives a possibility to solve different inverse problems of the non-destructive eddy-current testing. Further developments will be shown the solving of eq.(6) by special numerical operations, like Gauss-Seidel-Method [4]. [Pg.367]

Chapter 4.3. discusses the explained theory for choosed examples. For several cracks the output is pre-calculated by using the impulse response and compared with measurement data. [Pg.367]

All described sensor probes scan an edge of the same material to get the characteristic step response of each system. The derivation of this curve (see eq.(4) ) causes the impulse responses. The measurement frequency is 100 kHz, the distance between sensor and structure 0. Chapter 4.2.1. and 4.2.2. compare several sensors and measurement methods and show the importance of the impulse response for the comparison. [Pg.369]

The first example presents the importance of the impulse response function for the comparison of several sensors with the same arrangement from chapter 3.1.. [Pg.369]

Figures Impulse responses of different coils on a material edge... Figures Impulse responses of different coils on a material edge...
It should be a symmetrical form in the impulse response of a linear system. [Pg.370]

The following examples represent the importance of the impulse response for the comparison of different magnetic field sensors. For presentation in this paper only one data curve per method is selected and compared. The determined signals and the path x are related in the same way like in the previous chapter. [Pg.370]

Figure 7 Impulse responses of different sensor systems... Figure 7 Impulse responses of different sensor systems...
This is visible in the behaviour of the impulse responses as well (fig, 7), There the amplitude of curve (1) (gWng, )) is the highest, of curve (2) ig(L,)) the lowest, but the maxima are not located at the same place. [Pg.371]

The difference in widths of the impulse responses are small. Especially visible the pulse response of the inductive sensors, curves (1) and... [Pg.371]

For calculation the known data are the. .input signal", cracks of different widths, and the impulse response. The material of the crack model is assigned to the value 0, the air to 1. [Pg.371]

The determined eddy-eurrent parameter is the inductance of the eomplex impedance measured by impedance analyzer at j=100 kHz. Therefore the impulse response function from chapter 4.2.1. is used for calculation. The depth of the cracks is big in comparison to coil size. For presentation the measured and pre-calculated data are related to their maxima (in air). The path X is related to the winding diameter dy of the coil. [Pg.372]

Methods from the theory of LTI-systems are practicable for eddy-current material testing problems. The special role of the impulse response as a characteristic function of the system sensor-material is presented in the theory and for several examples. [Pg.372]

So, a comparison of different types of magnetic field sensors is possible by using the impulse response function. High amplitude and small width of this bell-formed function represent a high local resolution and a high signal-to-noise-characteristic of a sensor system. On the other hand the impulse response can be used for calculation of an unknown output. In a next step it will be shown a solution of an inverse eddy-current testing problem. [Pg.372]

Due to its importance the impulse-pulse response function could be named. .contrast function". A similar function called Green s function is well known from the linear boundary value problems. The signal theory, applied for LLI-systems, gives a strong possibility for the comparison of different magnet field sensor systems and for solutions of inverse 2D- and 3D-eddy-current problems. [Pg.372]

For the examination of the applied metallic or ceramic layer, the test object is heated up from the outside The heat applying takes place impulse-like (4ms) by xenon-flash lamps, which are mounted on a rack The surface temperature arises to approx 150 °C Due to the high temperature gradient the warmth diffuses quickly into the material An incorrect layer, e g. due to a delamiation (layer removal) obstructs the heat transfer, so that a higher temperature can be detected with an infrared camera. A complete test of a blade lasts approximatly 5 minutes. This is also done automatically by the system. In illustration 9, a typical delamination is to be recognized. [Pg.405]

With this testing method an evaluation is possible within shortest time, i.e. directly after the heat impulse. The high temperature difference between a delamination and sound material is affected - among other parameters - by the thickness of the layer. Other parameters are size and stage of the delamination Generally, a high surface temperature refers to a small wall thickness and/or layer separation [4],... [Pg.405]

Illustration 10 Wallthickness Measurement with Impulse-Video-Thermography... [Pg.406]

The large temperature difference of the remarkable borehole, opposite other boreholes and their environment is significant. This high temperature difference is a typical feature for a small wall thickness between borehole and blade surface. For technical reasons, precise eroding of the boreholes is difficult. Due to this, the remaining wallthickness between the boreholes and the blade surface has to be determined, in order to prevent an early failure, Siemens/Kwu developed a new method to determine the wallthickness with Impulse-Video-Thermography [5],... [Pg.406]


See other pages where Impulsiveness is mentioned: [Pg.12]    [Pg.64]    [Pg.62]    [Pg.65]    [Pg.66]    [Pg.85]    [Pg.174]    [Pg.176]    [Pg.241]    [Pg.366]    [Pg.366]    [Pg.366]    [Pg.367]    [Pg.369]    [Pg.371]    [Pg.371]    [Pg.372]    [Pg.405]    [Pg.405]    [Pg.407]   
See also in sourсe #XX -- [ Pg.462 , Pg.463 , Pg.464 , Pg.465 , Pg.466 ]

See also in sourсe #XX -- [ Pg.381 , Pg.382 ]




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A Qualitative, Molecular Model of the Nerve Impulse

Action potential impulse

Application of Specific Impulse Formula

Approximation of the process impulse response

Arrhythmia abnormal impulse conduction

Axial-flow turbines impulse turbine

Axons impulse transmission along

B-Spline Impulse Response

Cardiac impulse, conduction

Chemical transmission of nerve impulse

Collision impulsive

Density impulse

Detector impulse response

Diagrams impulse

Digital filters impulse response

Dirac impulse

Dispersion Impulse signal

Distorted wave impulse approximation

ELECTROMAGNETIC IMPULSE (EMI) SHIELDING

Ecstasy impulsivity

Electric impulse

Electrical impulses

Electrical impulses, nervous system

Energy release impulsive

Experimental Theoretical Impulse Constants

Explosion), Impulse in

FWDs - impulse devices

Fermi impulsion

Finite impulse response filter

Finite-impulse-response model

Force impulse

Forcing functions, impulse function

Gas Motion Under the Action of Short-Duration Pressure (Impulse)

Harmonic impulse

Hearts impulse

High Power Impulse Magnetron

High Power Impulse Magnetron Sputtering

High Power Impulse Magnetron Sputtering HIPIMS)

Impulse

Impulse

Impulse Bit

Impulse MTS methods

Impulse Properties

Impulse approximation

Impulse approximation (partons

Impulse blading

Impulse breakdown

Impulse control

Impulse control disorders

Impulse current

Impulse definition

Impulse drying

Impulse excitation

Impulse excitation, time-domain

Impulse excitation, time-domain response

Impulse first derivative

Impulse forcing function

Impulse function

Impulse galvanic-static method

Impulse generator

Impulse graphite reactor

Impulse hammer test

Impulse input

Impulse levels

Impulse lines

Impulse lines, instrumentation

Impulse loading

Impulse meter

Impulse model

Impulse momentum

Impulse noise

Impulse of force

Impulse of the force

Impulse products

Impulse radio UWB

Impulse response

Impulse response FIA

Impulse response curve

Impulse response method

Impulse response model

Impulse response numerical determination

Impulse sampler

Impulse signal

Impulse specifique

Impulse stage

Impulse stimulus

Impulse theoretical consideration

Impulse theory

Impulse tracers

Impulse turbine

Impulse voltage withstand

Impulse voltage withstand tests

Impulse welding

Impulse-momentum balance

Impulse-response climate model

Impulse-response function

Impulse/momentum equation

Impulse/noise models

Impulsions, average, evaluation

Impulsive

Impulsive

Impulsive Decrease in Feedwater Flow Rate

Impulsive Raman excitation

Impulsive Sources

Impulsive excitation

Impulsive limit

Impulsive mechanism

Impulsive model

Impulsive motion

Impulsive noise

Impulsive object

Impulsive polarization

Impulsive reaction model angular distributions

Impulsive stimulated Raman scattering

Impulsive stimulated Raman scattering ISRS)

Impulsive stimulated scattering

Impulsivity

Infinite-impulse-response filter

Inhibit the Ability of Neurons to Conduct Impulses

Laplace transforms unit impulse

Linear Impulse—Forces Acting Over Time

Linear impulse

Loss of impulse control

Maximum impulse displacement

Maximum impulse stress

Maximum specific impulse

Mechanical impulse

Methods impulse

Mollified impulse method

Momentum orbital impulse

Multi-dimensional impulse response functions

Nerve impulse and cardiovascular electrochemistry

Nerve impulse in muscle contraction

Nerve impulse ion conducting channels

Nerve impulse propagation

Nerve impulse transmission

Nerve impulses

Nerve impulses propagation speeds

Nerve impulses, generation

Nervous impulse, propagation

Neuronal impulse patterns

Neurons, membranes impulses transmitted along

Nonlinear impulse response

Normalized impulse response function

Nuclear magnetic resonance impulse

Off-design conditions in an impulse blade typical corrections for kinetic energy losses

Point of maximum impulse

Positive phase impulse

Press impulse

Pressure and impulse

Pressure impulse

Pressure-Impulse method

Pressure-impulse diagrams

Product energy distribution impulsive model

Propagation of Impulses in the Guinea Pig Ureter

Protein nerve impulse transmission

Pumps mechanical impulse

Raman resonant impulsive stimulated

Rated impulse voltage

Reaction mechanism impulsive

Residence time distribution function impulse input, 263

Residence time distribution impulse response

Rocket motors specific impulse

Rocket propellants specific impulse

Rockets specific impulse

Safety, emotions, and impulse control

Scattering techniques impulsive stimulated

Sealing impulse

Sexual behavior impulsive

Simple initiating impulse

Single Neuron Impulse Patterns and Tonic-to-Bursting Transitions

Single impulse

Sodium impulse

Sound impulse meter

Specific Impulse Values

Specific Impulse of Flight Mach Number

Specific impulse

Specific impulse of a rocket

Specific impulse of rockets

Specific impulse table

Specific impulse theoretical

Specific impulse, blast waves

Specific impulse, fsp

Specific impulsion

Spectroscopy impulse

Steam turbine impulse

Step function unit impulse

Stimulatory impulses

Switching impulse withstanding level

System impulse responses

THERMAL IMPULSE WELDING

Testing impulse voltage withstand

The Mollified Impulse Method

The Nerve Impulse

The Propagation of Nerve Impulses

The impulse function

The impulse response

The impulsive model

The parton model as an impulse approximation

Thrust and Specific Impulse

Thrusters specific impulse

Total impulse

Tracer impulse method

Transforms impulse properties

Transmission of electrical impulses

Transmission of the Nervous Impulse

Turbines, steam impulse stage

Unit impulse

Unit impulse function

Unit impulse waveform

Unitary impulse

Vacuum relief impulse line

Valves impulse

Velocity diagrams impulse diagram

Venting impulse lines

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