Publication detail

Inverse Monitoring of Loading State with Output Measurements

PROKOP, A.

Original Title

Inverse Monitoring of Loading State with Output Measurements

English Title

Inverse Monitoring of Loading State with Output Measurements

Type

journal article - other

Language

en

Original Abstract

In many industrial cases it is difficult or very often even impossible to measure directly loading forces acting on the structure. In this kind of situations one possibility is to apply inverse monitoring principle. This means computation methods for determining forces from the output that the forces generate. This paper presents an application of the use of inverse computation method applied for determining the magnitude and location of loading forces on a structure. For the inverse computation presented method utilizes an influence coefficient approach. In this principle an influence coefficient matrix (ICM) that describes the relation between external loading forces and measured strains in the structure is used (Doyle). The elements of the matrix are in this case obtained from finite element (FE) model of the structure. One problem in the use of the inverse method is that it is very often ill-posed. In practice this means that small errors in strain measurement results can cause large errors in force computation and also difficulties in matrix computation which is used in the method. The method is applied on a loaded cantilever beam that is rigidly connected with a welded structure. Validation of presented method is conducted by comparing its results with measured values of an experiment. The effect of error in the measured data on the accuracy of the inverse calculation is a crucial problem and it is discussed as well. The method shows promising results and proves that it is robust enough for industrial application.

English abstract

In many industrial cases it is difficult or very often even impossible to measure directly loading forces acting on the structure. In this kind of situations one possibility is to apply inverse monitoring principle. This means computation methods for determining forces from the output that the forces generate. This paper presents an application of the use of inverse computation method applied for determining the magnitude and location of loading forces on a structure. For the inverse computation presented method utilizes an influence coefficient approach. In this principle an influence coefficient matrix (ICM) that describes the relation between external loading forces and measured strains in the structure is used (Doyle). The elements of the matrix are in this case obtained from finite element (FE) model of the structure. One problem in the use of the inverse method is that it is very often ill-posed. In practice this means that small errors in strain measurement results can cause large errors in force computation and also difficulties in matrix computation which is used in the method. The method is applied on a loaded cantilever beam that is rigidly connected with a welded structure. Validation of presented method is conducted by comparing its results with measured values of an experiment. The effect of error in the measured data on the accuracy of the inverse calculation is a crucial problem and it is discussed as well. The method shows promising results and proves that it is robust enough for industrial application.

Keywords

Inverse method, Influence coefficient method, strain measurement

RIV year

2013

Released

11.06.2013

Location

Birmingham

ISBN

1363-7681

Periodical

International Journal of COMADEM

Year of study

16

Number

2

State

GB

Pages from

54

Pages to

59

Pages count

243

Documents

BibTex


@article{BUT100917,
  author="Aleš {Prokop}",
  title="Inverse Monitoring of Loading State with Output Measurements",
  annote="In many industrial cases it is difficult or very often even impossible to measure directly loading forces acting on the structure. In this kind of situations one possibility is to apply inverse monitoring principle. This means computation methods for determining forces from the output that the forces generate. This paper presents an application of the use of inverse computation
method applied for determining the magnitude and location of loading forces on a structure. For the inverse computation presented method utilizes an influence coefficient approach. In this principle an influence coefficient matrix (ICM) that describes the relation between external loading forces and measured strains in the structure is used (Doyle). The elements of the matrix are in this case obtained from finite element (FE) model of the structure. One problem in the use of the inverse method is that it is very often ill-posed. In practice this means that small errors in strain measurement results can cause large errors in force computation and also difficulties in matrix computation which is used in the method. The method is applied on a loaded cantilever beam that is rigidly connected with a welded structure. Validation of presented method is conducted by comparing its results with measured values of an experiment. The effect of error in the measured data on the accuracy of the inverse calculation is a crucial problem and it is discussed as well. The method shows promising results and proves that it is robust enough for industrial application.",
  chapter="100917",
  number="2",
  volume="16",
  year="2013",
  month="june",
  pages="54--59",
  type="journal article - other"
}