nass-micro-station-measurements/2018-10-12 - Marc/index.org

Measurements

• Experimental conditions
• Measurements procedure
• Measurement Channels
• Experiments
• Data Analysis
  • Loading of the data

Experimental conditions

• Measurement made in the experiment hutch
• FS=256Hz
• Made by Marc Lesourd on the 12 of October 2018

Measurements procedure

8 Geophone are used (see table tab:meas_channels):

• 7 L-28LB geophones (table tab:L-28LB)
• 1 L-4C geophone (table tab:L-4C)

Natural Frequency [Hz]	4.5
Weight [g]	140
Sensitivity [V/(m/s)]	31.3

L-28LB Geophone characteristics

Natural Frequency [Hz]	1
Weight [g]	2150
Sensitivity [V/(m/s)]	276.8

L-4C Geophone characteristics

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

• Marble
• Ty
• Hexapod

Measurement Channels

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

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

Description of each measurement channel

Experiments

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

Description of the location of direction of the excitation for each measurement

Data Analysis

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');