Research Methods in Civil Engineering 2019‐ 3/18/2020 2020 Making a presentation 1 Do you want to avoid this ? 2 2 1
Research Methods in Civil Engineering 2019‐ 3/18/2020 2020 What is an efficient presentation ? ‐ Have a message ! ‐ Make attractive slides ‐ Increase the signal‐to‐noise ratio ‐ Respect the timing 3 3 1. Have a message What do you want people to remember ? 4 4 2
Research Methods in Civil Engineering 2019‐ 3/18/2020 2020 Building your message 1. What is the context ? 2. What question/problem do you want to address ? 3. What is your methodology / procedure ? 4. What results did you get ? 5. What kind of information can you extract from it ? 6. What are the future actions/decisions to be taken ? At the end of the story, you want your audience to remember the most important information and to convince them with proper arguments 5 5 Example : A 20 min presentation Optimization of Tuned Mass Damper parameters based on numerical optimization and model reduction M. Soubeyroux 1 , C. Dumoulin 2 and A. Deraemaeker 2 1 ENSTA ParisTech 2 Université Libre de Bruxelles, BATir 6 6 3
Research Methods in Civil Engineering 2019‐ 3/18/2020 2020 So what was the message ? • There is a need to optimize TMD parameters • Analytical techniques have limitations • Numerical approaches are too expensive • Model reduction is introduced to lower comp. costs • It leads to a drastic reduction (2days ‐> 2min) Very convincing argument This approach should be extended for more realistic load cases and other objectives This is your message. How can you deliver it efficiently ? 7 7 2.Make attractive slides Attract the eye of your audience ! 8 8 4
Research Methods in Civil Engineering 2019‐ 3/18/2020 2020 2.1 The power of illustrations and the rate to deliver information 9 9 Example : SHM of the Westbury Hotel The building is assumed to be excited by the wind. This causes vibrations which can be measured with dedicated sensors such as accelerometers or strain sensors. Our aim is to use the measured data from these sensors in real‐time to be able to monitor the structure, i.e. to detect the appearance of damage and possibly locate where the damage has occurred. This is an important tool to aid for the maintenance of the building 10 10 5
Research Methods in Civil Engineering 2019‐ 3/18/2020 2020 Example : SHM of the Westbury Hotel What about a nice picture ? • The building is assumed to be excited by the wind. This causes vibrations which can be measured with dedicated sensors such as accelerometers or strain sensors. • Our aim is to use the measured data from these sensors in real‐time to be able to monitor the structure, i.e. to detect the appearance of damage and possibly locate where the damage has occurred. • This is an important tool to aid for the maintenance of the building 11 11 Example : SHM of the Westbury Hotel And adding simple animations • The building is assumed to be excited by the wind. This causes vibrations which can be measured with dedicated sensors such as accelerometers or strain sensors. • Our aim is to use the measured data from these sensors in real‐time to be able to monitor the structure, i.e. to detect the appearance of damage and possibly locate where the damage has occurred. • This is an important tool to aid for the maintenance of the building Should you read the text exactly ? 12 12 6
Research Methods in Civil Engineering 2019‐ 3/18/2020 2020 Example : SHM of the Westbury Hotel What about making an illustration and reducing the amount of text ? Objective : ‐ define a strategy to locate damage based on time‐domain data ‐ compare strain and acceleration measurements 13 13 Eigenfrequencies and mode shapes Healthy structure Damaged structure Eigenfrequencies Eigenfrequencies � � 𝜕 � � 𝑒𝑗𝑏�𝐸 � � 𝜕 � � 𝑒𝑗𝑏�𝐸 � � �� �� Mode shapes Mode shapes Eig function Eig function • • 𝑊 �, 𝐸 � � 𝑓𝑗 𝑛𝑒𝑚. 𝑙, 𝑛𝑒𝑚. 𝑛 𝑊 �, 𝐸 � � 𝑓𝑗 𝑛𝑒𝑚. 𝑙, 𝑛𝑒𝑚. 𝑛 Flip function Flip function • • 𝑊 �� � 𝑔𝑚𝑗𝑞�𝑊 � 1: 6: 498,1 � 𝑊 �� � 𝑔𝑚𝑗𝑞�𝑊 � 1: 6: 498,1 � [from student presentations] 14 14 7
Research Methods in Civil Engineering 2019‐ 3/18/2020 2020 Problems • Text and no illustration • All data at once • Uses undefined quantities (D1, mdl.k, …) • Very technical (Matlab code) • No hint on the difference between damaged and healthy • Title not very specific 15 15 Extraction of eigenfrequencies and mode shapes Use illustrations instead of text Damage = reduced stiffness in some elements 16 16 8
Research Methods in Civil Engineering 2019‐ 3/18/2020 2020 2.2 Vectorial graphic / Pixel image Vector graphic : eps, pdf, svg, ai, cdr, … (Adobe Illustrator, CorelDraw, InkScape) Pixel image : jpg, png, gif, tiff, … (Photoshop, Gimp, Paint, …) 17 17 Integration in PowerPoint JPG 100 dpi SVG 18 18 9
Research Methods in Civil Engineering 2019‐ 3/18/2020 2020 Integration in PowerPoint JPG 1200 dpi SVG 19 19 Create your own illustrations • Bad resolution • Not optimal for the story you want to tell (with CorelDraw) Spend some time to make your own illustrations 20 20 10
Research Methods in Civil Engineering 2019‐ 3/18/2020 2020 2.3 Tell your story with your illustrations 21 21 Output Based only SHM • Strain gauges are installed on the building. • The building is mainly subjected to wind oriented in the X‐Direction of the tower. • Our goal is to detect and locate damage directly from the sensors response, without any knowledge of the model of the structure. • Models always contain some simplification and are not accurate enough to detect the onset of damage. • We have recorded signals on the full set of transducers at two different instants. • There are in total 83 strain gauges, one at each level of the building and it makes. For the all the sensor 100001 values were reported. • The first strain gauge is at the bottom of the building. • The first set of measurements corresponds to the healthy case while we suspect that a damage has occurred for the second set of signals. [from student presentations] 22 22 11
Research Methods in Civil Engineering 2019‐ 3/18/2020 2020 Output‐only SHM Objective : locate the damage based on output‐only data from strain sensors 23 23 2.4 Graphs • Choose the right type of graph • Pay attention to axes labels and units • Improve readability of the graph : highlight information (stay away from default graphs in Matlab, Excel, …) 24 24 12
Research Methods in Civil Engineering 2019‐ 3/18/2020 2020 25 25 Example : mode shapes of a cantilever beam Initial Matlab Figures 26 26 13
Research Methods in Civil Engineering 2019‐ 3/18/2020 2020 Example : mode shapes of a cantilever beam Increase line width, font size 27 27 Example : mode shapes of a cantilever beam ‐ Reorganize ‐ Change axis style ‐> Engineering style ‐ Change line color 28 28 14
Research Methods in Civil Engineering 2019‐ 3/18/2020 2020 Example : mode shapes of a cantilever beam Stay away from the default Matlab/Excel style to improve aspect Length(m) 29 29 Graphs and legends You may consider putting legend into the Graph (use arrows) 30 30 15
Research Methods in Civil Engineering 2019‐ 3/18/2020 2020 Graphs and legends Example of a bad use of legend [from student presentations] 31 31 Highlight information in the graphs Tell your story in the graph 32 32 16
Research Methods in Civil Engineering 2019‐ 3/18/2020 2020 2.5 Combining graphs and illustrations 33 33 Bernouilli beam [from student presentations] 34 34 17
Research Methods in Civil Engineering 2019‐ 3/18/2020 2020 [from student presentations] Healthy structure 35 35 [from student presentations] Damaged structure 36 36 18
Research Methods in Civil Engineering 2019‐ 3/18/2020 2020 [from student presentations] Location of damaged area 37 37 Damage localization using strain measurements 83 82 healthy damaged z 4 3 2 Damaged area 1 38 38 19
Research Methods in Civil Engineering 2019‐ 3/18/2020 2020 Example : ultrasonic testing of concrete Is all the important information present to deliver the message ? 39 39 2.5 Equations Powerpoint equation editor 𝐸 � = 𝜁 � � 𝜁 � � � Latex‐> pdf ‐> image Iguana Tex 40 40 20
Research Methods in Civil Engineering 2019‐ 3/18/2020 2020 2.6 Pictures 41 41 Basic pictures handling Cropping Adjusting brightness and levels (saturation) 42 42 21
Research Methods in Civil Engineering 2019‐ 3/18/2020 2020 More advanced features Getting rid of the background Recomposing 43 43 Background When possible pay attention to the background 44 44 22
Research Methods in Civil Engineering 2019‐ 3/18/2020 2020 Background Or improve it …. 45 45 Insert information in your pictures Emitter Coupling Receiver [from student presentations] 46 46 23
Research Methods in Civil Engineering 2019‐ 3/18/2020 2020 Insert information in your pictures 47 47 2.7 Graphical charter and template 48 48 24
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