From 09b3e51309682d22d3e208cae8a46aeed4f8516f Mon Sep 17 00:00:00 2001 From: Thomas Dehaeze Date: Tue, 14 May 2019 23:06:50 +0200 Subject: [PATCH] Update main page --- 2017-11-17 - Marc/index.html | 166 ++++++++++++++-------- 2017-11-17 - Marc/index.org | 18 +++ 2018-01-12 - Marc/index.html | 250 ++++++++++++++++++++------------- 2018-01-12 - Marc/index.org | 15 ++ 2018-10-12 - Marc/index.html | 162 ++++++++++++++-------- 2018-10-12 - Marc/index.org | 9 ++ index.html | 262 ++--------------------------------- index.org | 63 +-------- 8 files changed, 430 insertions(+), 515 deletions(-) diff --git a/2017-11-17 - Marc/index.html b/2017-11-17 - Marc/index.html index d654bd0..82f367d 100644 --- a/2017-11-17 - Marc/index.html +++ b/2017-11-17 - Marc/index.html @@ -3,12 +3,12 @@ "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> - + Measurements - + - - - - + + + + + -
+
+ UP + | + HOME +

Measurements

+
+

1 Experimental conditions

+
+ + + +++ ++ + + + + + + + + + + + + + + + + + + + + + +
Date2017-11-17
SensorsAccelerometers
ExcitationInstrumented Hammer
LocationLaboratory
+

-Back to main page. +Dynamics of the station is evaluated using instrumented hammer and accelerometers fixed on each stage.

-
-

1 Experimental conditions

-
+

+Goal: +

+
    +
  • Obtain a first estimation of resonance frequencies
    • +
+ +
  • Measurement made in a metrology lab
  • The granite is not glued to the floor
  • The Y-Translation stage is powered and in closed-loop
  • The spindle is not powered
    • -
  • Mass is placed on top of the Hexapod (how much?) (figure 1).
    • +
  • Mass is placed on top of the Hexapod (how much?) (figure 1).
  • Made by Marc Lesourd on the 17th of November 2017
-
+

accelerometers.png

Figure 1: Accelerometers position

-
+

instrumented_hammer.png

Figure 2: Instrumented Hammer used

@@ -301,11 +346,11 @@ for the JavaScript code in this tag.
-
-

2 Measurements procedure

+
+

2 Measurements procedure

-3-axis Accelerometers (specifications table 1) are glued on (see figure 1): +3-axis Accelerometers (specifications table 1) are glued on (see figure 1):

  • Marble
    • @@ -314,7 +359,7 @@ for the JavaScript code in this tag.
  • top of Hexapod
- +
@@ -351,7 +396,7 @@ for the JavaScript code in this tag.
Table 1: Pieozoelectric acc. 356b18 - 3 axis

-The structure is excited using an instrumented hammer with impacts on (see figure 2): +The structure is excited using an instrumented hammer with impacts on (see figure 2):

  • Marble
    • @@ -360,8 +405,8 @@ The structure is excited using an instrumented hammer with impacts on (se
-
-

3 Measurement Files

+
+

3 Measurement Files

Two measurements files are: @@ -370,7 +415,7 @@ Two measurements files are:

  • id31_microstation_2017_11_17_frf.mat that contains:
    • freq_frf the frequency vector in Hz
      • -
    • Computed frequency response functions (see table 2)
      • +
    • Computed frequency response functions (see table 2)
  • id31_microstation_2017_11_17_coh.mat
      @@ -379,10 +424,10 @@ Two measurements files are:

    -For each of the measurement, the measured channels are shown on table 3. +For each of the measurement, the measured channels are shown on table 3.

    - +
    @@ -438,7 +483,7 @@ For each of the measurement, the measured channels are shown on table +
    Table 2: Description of the location of direction of the excitation for each measurement
    @@ -554,12 +599,12 @@ For each of the measurement, the measured channels are shown on table -

    4 Data Analysis

    +
    +

    4 Data Analysis

    -
    -

    4.1 Loading of the data

    +
    +

    4.1 Loading of the data

    load('./raw_data/id31_microstation_2017_11_17_coh.mat',...
@@ -583,8 +628,8 @@ load(
-
    4.2 Pre-processing of the data
    
+
    
+
    4.2 Pre-processing of the data
    
 
    
 
    
 The FRF data are scaled with the sensitivity of the accelerometer and integrated two times to have the displacement instead of the acceleration.
@@ -606,11 +651,11 @@ frf_marble_z = -
-
    4.3 X-direction FRF
    
+
    
+
    4.3 X-direction FRF
    
 
    
 
-
    
+
    
 
    marble_x_frf.png
 
    
 
    Figure 3: Response to a force applied on the marble in the X direction
    
@@ -618,7 +663,7 @@ frf_marble_z = -
+
    
 
    hexa_x_frf.png
 
    
 
    Figure 4: Response to a force applied on the hexa in the X direction
    
@@ -626,18 +671,18 @@ frf_marble_z = -
-
    4.4 Y-direction FRF
    
+
    
+
    4.4 Y-direction FRF
    
 
    
 
-
    
+
    
 
    marble_y_frf.png
 
    
 
    Figure 5: Response to a force applied on the marble in the Y direction
    
 
    
 
 
-
    
+
    
 
    hexa_y_frf.png
 
    
 
    Figure 6: Response to a force applied on the hexa in the Y direction
    
@@ -645,29 +690,42 @@ frf_marble_z = -
-
    4.5 Z-direction FRF
    
+
    
+
    4.5 Z-direction FRF
    
 
    
 
-
    
+
    
 
    marble_z_frf.png
 
    
 
    Figure 7: Response to a force applied on the marble in the Z direction
    
 
    
 
 
-
    
+
    
 
    hexa_z_frf.png
 
    
 
    Figure 8: Response to a force applied on the hexa in the Z direction
    
 
    
+
    
+
    
+
    
+
    
+
    5 Results
    
+
    
+
    
+
      
+
    • Resonances have been identified at 45Hz and 75Hz
      • 
+
    • However, the quality of the measurements are bad at low frequency
      • 
+
    • New measurements should be done with Geophones
      • 
+
    
+
 
    
 
    
 
    
 
    
 
    
-
    Author: Thomas Dehaeze
    
-
    Created: 2019-05-10 ven. 09:46
    
+
    Author: Dehaeze Thomas
    
+
    Created: 2019-05-14 mar. 23:06
    
 
    Validate
    
 
    
 
diff --git a/2017-11-17 - Marc/index.org b/2017-11-17 - Marc/index.org
index 786133e..eb77b82 100644
--- a/2017-11-17 - Marc/index.org	
+++ b/2017-11-17 - Marc/index.org	
@@ -30,6 +30,18 @@
 :END:
 
 * Experimental conditions
+
+| *Date*       | 2017-11-17          |
+| *Sensors*    | Accelerometers      |
+| *Excitation* | Instrumented Hammer |
+| *Location*   | Laboratory          |
+
+Dynamics of the station is evaluated using instrumented hammer and accelerometers fixed on each stage.
+
+*Goal*:
+- Obtain a first estimation of resonance frequencies
+
+
 - Measurement made in a metrology lab
 - The granite is not glued to the floor
 - The Y-Translation stage is powered and in closed-loop
@@ -303,3 +315,9 @@ The FRF data are scaled with the sensitivity of the accelerometer and integrated
 #+CAPTION: Response to a force applied on the hexa in the Z direction
 #+RESULTS: fig:hexa_z_frf
 [[file:figs/hexa_z_frf.png]]
+* Results
+#+begin_important
+- Resonances have been identified at 45Hz and 75Hz
+- However, the quality of the measurements are bad at low frequency
+- New measurements should be done with Geophones
+#+end_important
diff --git a/2018-01-12 - Marc/index.html b/2018-01-12 - Marc/index.html
index 88167fd..3a5be3e 100644
--- a/2018-01-12 - Marc/index.html	
+++ b/2018-01-12 - Marc/index.html	
@@ -3,12 +3,12 @@
 "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
 
 
-
+
 
 
 Measurements
 
-
+
 
 
 
-
-
-
-
+
+
+
+
+
 
 
 
-
    
+
    
 
    Measurements
    
 
 
-
    
-Back to main page.
-
    
-
-
    
-
    1 Experimental conditions
    
+
    
+
    1 Experimental conditions
    
 
    
+
    Table 3: Description of each measurement channel
    + + +++ ++ + + + + + + + + + + + + + + + + + + + + + + + + + + +
    Date2018-01-12
    SensorsGeophones
    ExcitationInstrumented Hammer
    LocationLaboratory
    NotesUnglued Granite
    +
    • The granite is not glued to the floor
    • FS = 512Hz
    • Made by Marc Lesourd on the 12 of January 2018
    + +

    +Goal: +Obtain better coherence at low frequency. +

    • -
    -

    2 Measurements procedure

    +
    +

    2 Measurements procedure

    Geophones -L-28LB geophones (table 1) are placed on +L-28LB geophones (table 1) are placed on

    • Marle
      • @@ -297,7 +341,7 @@ L-28LB geophones (table 1) are placed on
    • Top of Hexapod
    - +
    @@ -333,10 +377,10 @@ The structure is excited using an instrumented hammer with impacts on -
    -

    3 Measurement Channels

    +
    +

    3 Measurement Channels

    -
    Table 1: L-28LB Geophone characteristics
    +
    @@ -390,10 +434,10 @@ The structure is excited using an instrumented hammer with impacts on -
    -

    4 Experiments

    +
    +

    4 Experiments

    -
    Table 2: Description of each measurement channel
    +
    @@ -453,12 +497,12 @@ The structure is excited using an instrumented hammer with impacts on -
    -

    5 Data Analysis

    +
    +

    5 Data Analysis

    -
    -

    5.1 Loading and pre-processing of the data

    +
    +

    5.1 Loading and pre-processing of the data

    The Geophone sensitivity is defined below: @@ -467,7 +511,7 @@ The Geophone sensitivity is defined below: 

    w0 = 4.5*2*pi; % [rad/s]
 ksi = 0.38;
 G0 = 31.3; % [V/(m/s)]
-[Omitted long matching line]
+G = G0*(s/w0)^2/((s/w0)^2 + 2*ksi*(s/w0) + 1); % [V/(m/s)]
    @@ -563,19 +607,83 @@ coh_hexa_z((:, 3) = coh6(:, 4); % hexa_z
    +
    +
    +
    +

    5.2 X-direction FRF

    +
    + +
    +

    marble_x_frf.png +

    +

    Figure 1: Response to a force applied on the marble in the X direction

    +
    + + + +
    +

    hexa_x_frf.png +

    +

    Figure 2: Response to a force applied on the hexa in the X direction

    +
    +
    +
    + +
    +

    5.3 Y-direction FRF

    +
    + +
    +

    marble_y_frf.png +

    +

    Figure 3: Response to a force applied on the marble in the Y direction

    +
    + + +
    +

    hexa_y_frf.png +

    +

    Figure 4: Response to a force applied on the hexa in the Y direction

    +
    +
    +
    + +
    +

    5.4 Z-direction FRF

    +
    + +
    +

    marble_z_frf.png +

    +

    Figure 5: Response to a force applied on the marble in the Z direction

    +
    + + +
    +

    hexa_z_frf.png +

    +

    Figure 6: Response to a force applied on the hexa in the Z direction

    +
    +
    +
    +
    +

    5.5 Save the processed data

    +

    Finally, we save the processed data. 

    save('./data/id31_microstation_2018_01_12_frf.mat', ...
+       'freq_frf', ...
        'frf_marble_x', ...
        'frf_marble_y', ...
        'frf_marble_z', ...
        'frf_hexa_x', ...
        'frf_hexa_y', ...
        'frf_hexa_z');
-save('./data/id31_microstation_2018_01_12_frf.mat', ...
+save('./data/id31_microstation_2018_01_12_coh.mat', ...
+       'freq_frf', ...
        'coh_marble_x', ...
        'coh_marble_y', ...
        'coh_marble_z', ...
@@ -586,69 +694,23 @@ save(
-
    5.2 X-direction FRF
    
-
    
-
-
    
-
    marble_x_frf.png
-
    
-
    Figure 1: Response to a force applied on the marble in the X direction
    
 
    
+
    
+
    6 Results
    
+
    
+
    
+
      
+
    • Resonances at 42Hz, 70Hz and 125Hz have been identified
      • 
+
    • The coherence is much better than when using accelerometers
      • 
+
    
 
-
-
-
    
-
    hexa_x_frf.png
-
    
-
    Figure 2: Response to a force applied on the hexa in the X direction
    
-
    
-
    
-
    
-
-
    
-
    5.3 Y-direction FRF
    
-
    
-
-
    
-
    marble_y_frf.png
-
    
-
    Figure 3: Response to a force applied on the marble in the Y direction
    
-
    
-
-
-
    
-
    hexa_y_frf.png
-
    
-
    Figure 4: Response to a force applied on the hexa in the Y direction
    
-
    
-
    
-
    
-
-
    
-
    5.4 Z-direction FRF
    
-
    
-
-
    
-
    marble_z_frf.png
-
    
-
    Figure 5: Response to a force applied on the marble in the Z direction
    
-
    
-
-
-
    
-
    hexa_z_frf.png
-
    
-
    Figure 6: Response to a force applied on the hexa in the Z direction
    
-
    
 
    
 
    
 
    
 
    
 
    
-
    Author: Thomas Dehaeze
    
-
    Created: 2019-04-15 lun. 13:12
    
+
    Author: Dehaeze Thomas
    
+
    Created: 2019-05-14 mar. 23:06
    
 
    Validate
    
 
    
 
diff --git a/2018-01-12 - Marc/index.org b/2018-01-12 - Marc/index.org
index c29019f..8d70171 100644
--- a/2018-01-12 - Marc/index.org	
+++ b/2018-01-12 - Marc/index.org	
@@ -30,10 +30,20 @@
 :END:
 
 * Experimental conditions
+
+| *Date*       | 2018-01-12          |
+| *Sensors*    | Geophones           |
+| *Excitation* | Instrumented Hammer |
+| *Location*   | Laboratory          |
+| *Notes*      | Unglued Granite     |
+
 - The granite is not glued to the floor
 - FS = 512Hz
 - Made by Marc Lesourd on the 12 of January 2018
 
+*Goal*:
+Obtain better coherence at low frequency.
+
 * Measurements procedure
 *Geophones*
 L-28LB geophones (table [[tab:L-28LB]]) are placed on
@@ -348,3 +358,8 @@ Finally, we save the processed data.
          'coh_hexa_y', ...
          'coh_hexa_z');
 #+end_src
+* Results
+#+begin_important
+  - Resonances at 42Hz, 70Hz and 125Hz have been identified
+  - The coherence is much better than when using accelerometers
+#+end_important
diff --git a/2018-10-12 - Marc/index.html b/2018-10-12 - Marc/index.html
index 2bbc04d..a4b645c 100644
--- a/2018-10-12 - Marc/index.html	
+++ b/2018-10-12 - Marc/index.html	
@@ -3,12 +3,12 @@
 "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
 
 
-
+
 
 
 Measurements
 
-
+
 
 
 
-
-
-
-
+
+
+
+
+
 
 
 
-
    
+
    
+  UP 
+ |
+  HOME 
+
    
 
    Measurements
    
 
 
-
    
-Back to main page.
-
    
-
-
    
-
    1 Experimental conditions
    
+
    
+
    1 Experimental conditions
    
 
    
 
      
 
    • Measurement made in the experiment hutch
      • 
 
    • FS=256Hz
      • 
 
    • Made by Marc Lesourd on the 12 of October 2018
      • 
 
    
-
    
-
    
 
-
    
-
    2 Measurements procedure
    
-
    
+
    Table 3: Description of the location of direction of the excitation for each measurement
    + + +++ ++ + + + + + + + + + + + + + + + + + + + + + +
    Date2018-10-12
    SensorsGeophones
    ExcitationInstrumented Hammer
    LocationExperimental Hutch
    +

    -8 Geophone are used (see table 3): +Goal:

      -
    • 7 L-28LB geophones (table 1)
      • -
    • 1 L-4C geophone (table 2)
      • +
    • 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)
    - +
    @@ -318,7 +358,7 @@ for the JavaScript code in this tag.
    Table 1: L-28LB Geophone characteristics
    - +
    @@ -345,7 +385,7 @@ for the JavaScript code in this tag.
    Table 2: L-4C Geophone characteristics

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

    • Marble
      • @@ -355,14 +395,14 @@ The structure is excited using an instrumented hammer with impacts on (se
    -
    -

    3 Measurement Channels

    +
    +

    3 Measurement Channels

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

    - +
    @@ -451,10 +491,10 @@ Les fichiers xxxraw sont sans traitement dans le domaine temporel (en -
    -

    4 Experiments

    +
    +

    4 Experiments

    -
    Table 3: Description of each measurement channel
    +
    @@ -532,39 +572,39 @@ Les fichiers xxxraw sont sans traitement dans le domaine temporel (en -
    -

    5 Data Analysis

    +
    +

    5 Data Analysis

    -
    -

    5.1 Loading of the data

    +
    +

    5.1 Loading of the data

    -
    load('./data/freq_frf.mat');
+
    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_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_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/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_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_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');
+load('./data/phs_ty_x.mat');
+load('./data/phs_ty_y.mat');
+load('./data/phs_ty_z.mat');
    @@ -572,8 +612,8 @@ load('./data/
    -

    Author: Thomas Dehaeze

    -

    Created: 2019-03-15 ven. 11:42

    +

    Author: Dehaeze Thomas

    +

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

    Validate

    diff --git a/2018-10-12 - Marc/index.org b/2018-10-12 - Marc/index.org index 9c4f772..fc5ee00 100644 --- a/2018-10-12 - Marc/index.org +++ b/2018-10-12 - Marc/index.org @@ -34,6 +34,15 @@ - 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. + * Measurements procedure 8 *Geophone* are used (see table [[tab:meas_channels]]): - 7 L-28LB geophones (table [[tab:L-28LB]]) diff --git a/index.html b/index.html index fc6b86e..ce7edc7 100644 --- a/index.html +++ b/index.html @@ -3,7 +3,7 @@ "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> - + Measurement of the ID31 Micro-Station @@ -254,33 +254,9 @@ for the JavaScript code in this tag.

    Table of Contents

    @@ -289,233 +265,25 @@ for the JavaScript code in this tag. This web-page gathers all the measurements done on the ID31 Micro Station.

    -
    -

    1 Measurements of the dynamics of the station

    +
    +

    1 Measurements of the dynamics of the station

    -
    - -
    -

    1.1 Measurement 1

    -
    -

    -Link to the analysis -

    -
    - -
    -

    1.1.1 Notes

    -
    -
    Table 4: Description of the location of direction of the excitation for each measurement
    - - --- -- - - - - - - - - - - - - - - - - - - - - - -
    Date2017-11-17
    SensorsAccelerometers
    ExcitationInstrumented Hammer
    LocationLaboratory
    - -

    -Dynamics of the station is evaluated using instrumented hammer and accelerometers fixed on each stage. -

    -
    -
    - - -
    -

    1.1.3 Results

    -
    -
    -
      -
    • Resonances have been identified at 45Hz and 75Hz
      • -
    • However, the quality of the measurements are bad at low frequency
      • -
    • New measurements should be done with Geophones
      • -
    - -
    -
    -
    -
    - -
    -

    1.2 Measurement 2

    -
    -

    -Link to the analysis -

    -
    - -
    -

    1.2.1 Notes

    -
    - - - --- -- - - - - - - - - - - - - - - - - - - - - - - - - - - -
    Date2018-01-12
    SensorsGeophones
    ExcitationInstrumented Hammer
    LocationLaboratory
    NotesUnglued Granite
    -
    -
    - -
    -

    1.2.2 Goal

    -
    -

    -Obtain better coherence at low frequency. -

    -
    -
    - -
    -

    1.2.3 Results

    -
    -
    -
      -
    • Resonances at 42Hz, 70Hz and 125Hz have been identified
      • -
    • The coherence is much better than when using accelerometers
      • -
    - -
    -
    -
    -
    - -
    -

    1.3 TODO Measurement 3

    -
    -

    -Link to the analysis -

    -
    - -
    -

    1.3.1 Notes

    -
    - - - --- -- - - - - - - - - - - - - - - - - - - - - - -
    Date2018-10-12
    SensorsGeophones
    ExcitationInstrumented Hammer
    LocationExperimental Hutch
    -
    -
    - -
    -

    1.3.2 Goal

    -
    -

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

    -
    -
    - -
    -

    1.3.3 Results

    -
    -
    -

    - -

    - -
    -
    -
    -
    -
    - -
    -

    2 Measurements of perturbations

    + -
    -

    3 Other

    +
    +

    3 Other

    Author: Thomas Dehaeze

    -

    Created: 2019-05-14 mar. 23:02

    +

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

    Validate

    diff --git a/index.org b/index.org index bafeb86..a83f132 100644 --- a/index.org +++ b/index.org @@ -15,69 +15,14 @@ This web-page gathers all the measurements done on the ID31 Micro Station. * Measurements of the dynamics of the station - [[file:dynamical-meas-granite/index.org][Dynamics from floor motion to marble motion]] - -** Measurement 1 -[[file:2017-11-17%20-%20Marc/index.org][Link to the analysis]] - -*** Notes -| *Date* | 2017-11-17 | -| *Sensors* | Accelerometers | -| *Excitation* | Instrumented Hammer | -| *Location* | Laboratory | - -Dynamics of the station is evaluated using instrumented hammer and accelerometers fixed on each stage. - -*** Goal -- Obtain a first estimation of resonance frequencies - -*** Results -#+begin_important -- Resonances have been identified at 45Hz and 75Hz -- However, the quality of the measurements are bad at low frequency -- New measurements should be done with Geophones -#+end_important - -** Measurement 2 -[[file:2018-01-12%20-%20Marc/index.org][Link to the analysis]] - -*** Notes -| *Date* | 2018-01-12 | -| *Sensors* | Geophones | -| *Excitation* | Instrumented Hammer | -| *Location* | Laboratory | -| *Notes* | Unglued Granite | - -*** Goal -Obtain better coherence at low frequency. - -*** Results -#+begin_important - - Resonances at 42Hz, 70Hz and 125Hz have been identified - - The coherence is much better than when using accelerometers -#+end_important - -** TODO Measurement 3 -[[file:2018-10-12%20-%20Marc/index.org][Link to the analysis]] - -*** Notes -| *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. - -*** Results -#+begin_important - -#+end_important +- [[file:2017-11-17%20-%20Marc/index.org][Measurement of the dynamics of the station using intrumented hammer and accelerometers]] +- [[file:2018-01-12%20-%20Marc/index.org][Measurement of the dynamics of the station using intrumented hammer and geophones]] +- [[file:2018-10-12%20-%20Marc/index.org][Measurement of the dyanamics - Micro station glued on ID31]] * Measurements of perturbations - [[file:disturbance-sr-rz/index.org][Measurement of the vibrations induced by the rotation of the slip-ring and spindle]] - [[file:disturbance-ty-sr/index.org][Measurement of the vibrations induced by the simultaneous rotation of the slip-ring and scan of the translation stage]] -- [[file:disturbance-measurement/index.org][Disturbance Measurement - Spindle]] TODO +- [[file:disturbance-measurement/index.org][Disturbance Measurement - Spindle]] - [[file:slip-ring-electrical-noise/index.org][Measurement of the electrical noise induced by the slip-ring]] - [[file:ground-motion/index.org][Ground motion measurements]] - [[file:static-to-dynamic/index.org][Static guiding errors - Ty]]