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Measurements

Table of Contents

1 Experimental conditions

  • Measurement made in the experiment hutch
  • FS=256Hz
  • Made by Marc Lesourd on the 12 of October 2018
Date 2018-10-12
Sensors Geophones
Excitation Instrumented Hammer
Location Experimental Hutch

Goal:

  • The station is now installed on the experimental hutch with a glued granite (final location).
  • The station is identified again.

2 Measurements procedure

8 Geophone are used (see table 3):

  • 7 L-28LB geophones (table 1)
  • 1 L-4C geophone (table 2)
Table 1: L-28LB Geophone characteristics
Natural Frequency [Hz] 4.5
Weight [g] 140
Sensitivity [V/(m/s)] 31.3
Table 2: L-4C Geophone characteristics
Natural Frequency [Hz] 1
Weight [g] 2150
Sensitivity [V/(m/s)] 276.8

The structure is excited using an instrumented hammer with impacts on (see table 4):

  • Marble
  • Ty
  • Hexapod

3 Measurement Channels

Les fichiers xxxraw sont sans traitement dans le domaine temporel (environ 10 impacts par fichier)

Table 3: Description of each measurement channel
Ch. nb Element Location Direction
1 Geophone L-4C Marble Z
2 Geophone L-28LB Ty Z
3 Geophone L-28LB Tilt Z
4 Geophone L-28LB Hexa Z
5 Geophone L-28LB Marble H
6 Geophone L-28LB TY H
7 Geophone L-28LB Tilt H
8 Geophone L-28LB Hexa H
9 Hammer Variable Variable

4 Experiments

Table 4: Description of the location of direction of the excitation for each measurement
Meas. nb Location Direction
1 Marble Y
2 Ty Y
3 Hexa Y
4 Marble Z
5 Ty Z
6 Hexa Z
7 Marble X
8 Ty X
9 Hexa X

5 Data Analysis

5.1 Loading of the data

load('./data/freq_frf.mat');

load('./data/frf_hexa_x.mat');
load('./data/frf_hexa_y.mat');
load('./data/frf_hexa_z.mat');

load('./data/frf_marble_x.mat');
load('./data/frf_marble_y.mat');
load('./data/frf_marble_z.mat');

load('./data/frf_ty_x.mat');
load('./data/frf_ty_y.mat');
load('./data/frf_ty_z.mat');

load('./data/phs_hexa_x.mat');
load('./data/phs_hexa_y.mat');
load('./data/phs_hexa_z.mat');

load('./data/phs_marble_x.mat');
load('./data/phs_marble_y.mat');
load('./data/phs_marble_z.mat');

load('./data/phs_ty_x.mat');
load('./data/phs_ty_y.mat');
load('./data/phs_ty_z.mat');

Author: Dehaeze Thomas

Created: 2019-05-14 mar. 23:06

Validate