Research Output 1992 2019

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Conference contribution
2018

Analysis of residual transverse stresses in a thick UD glass/polyester pultruded profile using hole drilling with strain gage and digital image correlation

Yuksel, O., Baran, I., Ersoy, N. & Akkerman, R., 2 May 2018, Proceedings of the 21st International ESAFORM Conference on Material Forming, ESAFORM 2018. American Institute of Physics, Vol. 1960. 020040

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

strain gages
polyesters
drilling
residual stress
glass

An experimental investigation on the thermal field of overlapping layers in laser-assisted tape winding process

Hosseini, S. M. A., Baran, I. & Akkerman, R., 2 May 2018, Proceedings of the 21st International ESAFORM Conference on Material Forming, ESAFORM 2018. American Institute of Physics, Vol. 1960. 020011

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

tapes
laminates
lasers
temperature
products
2 Citations (Scopus)
1 Downloads (Pure)

Consolidation quality and mechanical performance of stamp formed tailored blanks produced by rapid AFP

Slange, T. K., Warnet, L. L., Grouve, W. J. B. & Akkerman, R., 2 May 2018, Proceedings of the 21st International ESAFORM Conference on Material Forming, ESAFORM 2018. American Institute of Physics, 020031. (AIP conference proceedings; vol. 1960).

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

consolidation
blanks
laminates
manufacturing
lay-up
12 Downloads (Pure)

Experimental Validation of Non-Collinear Wave Mixing Model in a PVC Specimen

Hernandez Delgadillo, H., Loendersloot, R., Wetsus, European Centre of Excellence for Sustainable Water Technology, Tinga, T. & Akkerman, R., 20 Dec 2018, 2018 IEEE International Ultrasonics Symposium (IUS). IEEE, 4 p.

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

Open Access
File
wave scattering
scattering amplitude
interactions
wave interaction
excitation

Non-hoop winding effect on bonding temperature of laser assisted tape winding process

Zaami, A., Baran, I. & Akkerman, R., 2 May 2018, Proceedings of the 21st International ESAFORM Conference on Material Forming, ESAFORM 2018. American Institute of Physics, Vol. 1960. 020041

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

tapes
lasers
temperature
rays
thermal analysis
2017
1 Citation (Scopus)
1 Downloads (Pure)

Analysis of the local fiber volume fraction variation in pultrusion process

Baran, I., Oct 2017, Proceedings of the 20th International ESAFORM Conference on Material Forming: ESAFORM 2017. AIP Publishing LLC, 030029. (AIP Conference Proceedings; vol. 1896, no. 1).

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

Pultrusion
Residual stresses
Volume fraction
Image segmentation
Fibers

Estimating product-to-product variations in metal forming using force measurements

Havinga, G. T. & Van Den Boogaard, T., 16 Oct 2017, Proceedings of the 20th International ESAFORM Conference on Material Forming, ESAFORM 2017. American Institute of Physics, Vol. 1896. 070002. (AIP conference proceedings; vol. 1896, no. 1).

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

metal forming
estimating
products
deep drawing
regression analysis
2 Citations (Scopus)

Influence of Prepreg Characteristics on Stamp Consolidation

Slange, T. K., Warnet, L. L., Grouve, W. J. B. & Akkerman, R., 16 Oct 2017, Proceedings of the 20th International ESAFORM Conference on Material Forming: ESAFORM 2017. AIP, 030034. (AIP Conference Proceedings; vol. 1896).

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

Consolidation
Thermoplastics
Composite materials
2 Citations (Scopus)
39 Downloads (Pure)

Numerical modeling of laser assisted tape winding process

Zaami, A., Baran, I. & Akkerman, R., Oct 2017, Proceedings of the 20th International ESAFORM Conference on Material Forming: ESAFORM 2017. AIP Publishing LLC, 180004. (AIP Conference Proceedings; vol. 1896, no. 1).

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

Open Access
File
Tapes
Lasers
Thermoplastics
Heat transfer
Aerospace applications
2016
2 Citations (Scopus)
3 Downloads (Pure)

Development of an inline water mains inspection technology: Detection of acidic deterioration in cement-based water pipes with ultrasonic pulse-echo technique

Hernandez Delgadillo, H., Loendersloot, R., Akkerman, R. & Yntema, D. R., 18 Sep 2016, Proceedings of 2016 IEEE International Ultrasonics Symposium (IUS). IEEE, 4 p.

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

cement
pipe
drinking water
degradation
damage
3 Citations (Scopus)
3 Downloads (Pure)

Influence of preconsolidation on consolidation quality after stamp forming of C/PEEK composites

Slange, T., Warnet, L., Grouve, W. J. B. & Akkerman, R., 27 Apr 2016, ESAFORM 2016: proceedings of the 19th international ESAFORM conference on material forming. Chinesta, F., Cueto, E. & Abisset-Chavanne, E. (eds.). Nantes, France: AIP, 170022

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

consolidation
manufacturing
void
welding
microscopy

Intimate contact development in laser assisted fiber placement

Kok, T., Grouve, W. J. B., Warnet, L. & Akkerman, R., 26 Jun 2016, ECCM17 - 17th European conference on Composite Materials,. Drechsler, K. (ed.). Munich, Germany: ESCM European Society for Composite Materials, p. -

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademic

2 Citations (Scopus)

Intimate contact development in laser assisted fiber placement

Donderwinkel, T. G., Rietman, B., Haanappel, S. & Akkerman, R., 27 Apr 2016, ESAFORM 2016: proceedings of the 19th international ESAFORM conference on material forming. Chinesta, F., Cueto, E. & Abisset-Chavanne, E. (eds.). Nantes, France: AIP, p. -

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

4 Citations (Scopus)
51 Downloads (Pure)

Optical process model for laser-assisted tape winding

Reichardt, J. M., Baran, I. & Akkerman, R., 26 Jun 2016, ECCM17, 17th European Conference on Composite Materials. Drechsler, K. (ed.). Munich, Germany: ESCM, European Society of Composite Materials, p. -

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

Open Access
File
tapes
lasers
fiber orientation
bidirectional reflectance
fibers
30 Downloads (Pure)

Parameter Study for Friction Surface Cladding of AA1050 on AA2024-T351

Liu, S., Bor, T. C., Geijselaers, H. J. M. & Akkerman, R., 17 May 2016, Proceedings of the 11th International Symposium on Friction Stir Welding. Cambridge, UK, p. -

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademic

File
1 Downloads (Pure)

Process induced transverse shear stresses in thick unidirectional pultruded profiles

Baran, I. & Akkerman, R., 26 Jun 2016, ECCM17, 17th European Conference on Composite Materials. Drechsler, K. (ed.). Munich, Germany: ESCM European Society for Composite Materials, 8 p.

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

Shear stress
Residual stresses
Bearings (structural)
Pultrusion
Structural loads

Recycling of long fibre thermoplastic composites by low shear mixing

de Bruijn, T. A., Vincent, G. A. & van Hattum, F. W. J., 13 Sep 2016, SAMPE Europe Conference 16 Liege: Liege, Belgium, 13–15 September 2016. Vangrimde, B. (ed.). Liege, Belgium, p. 540-546

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademic

Thermoplastics
Recycling
Fibers
Composite materials
Mechanical properties
2015
41 Downloads (Pure)

A parametric study on compression molding of reference parts with integrated features using carbon composite production waste

Abdul Rasheed, M. I., Rietman, B., Visser, R. & Akkerman, R., 15 Apr 2015, Material Forming ESAFORM 2015: 18th International ESAFORM conference. Ofenheimer, A., Poletti, C., Schalk-Kitting, D. & Sommitsch, C. (eds.). Trans Tech Publications Ltd, p. 458-463 (Key Engineering Materials; vol. 651-653).

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

Compression molding
Consolidation
Carbon
Fibers
Jamming

Delikli Kompozit Yapıların Sonlu Elemanlar Yöntemiyle Analizi

Parnas, K. L., Erartsin, O., Atar, M. B. & Tursun, G., 2015, TUMTMK 19 Bildiri Kitabi. TUMTMK

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademic

Open Access
29 Downloads (Pure)

Friction Surface Cladding of AA1050 on AA2024-T351; influence of clad layer thickness and tool rotation rate

Liu, S., Bor, T. C., Geijselaers, H. J. M. & Akkerman, R., 1 Oct 2015, 4th International conference on Scientific and Technical Advances on Friction stir Welding & Processing, FSWP 2015. San Sebastian, Spain: IK4 Lortek, p. -

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

File
Friction
Substrates
Hard facing
Deposits
Defects
32 Downloads (Pure)

On the mechanical behaviour of a butt jointed thermoplastic composite under bending

Baran, I., Warnet, L. & Akkerman, R., 19 Jul 2015, ICCM20 proceedings. Thomsen, O. T. (ed.). Copenhagen, p. -

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

File
Thermoplastics
Fillers
Composite materials
Skin
Crack initiation
29 Downloads (Pure)

Thermal and Flow Analysis of Friction Surface Cladding with Varying Clad Layer Thickness

Liu, S., Bor, T. C., Geijselaers, H. J. M. & Akkerman, R., 31 May 2015, International Deep Drawing Research Group 2015, IDDRG. Zhang, S-H., Chen, J. & Jing, H-M. (eds.). Shanghai, p. -

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

File
2014
5 Citations (Scopus)

Bending characterization of UD composites

Sachs, U., Akkerman, R. & Haanappel, S., 2014, 17th Conference of the European Scientific Association on Material Forming, ESAFORM 2014. Trans Tech Publications Ltd, p. 399-406

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

1 Citation (Scopus)

Circular Braiding Process Simulation for a Pressure Vessel

van Ravenhorst, J. H. & Akkerman, R., 2014, ASME 2014 Pressure Vessels and Piping Conference, PVP 2014: Volume 6A: Materials and Fabrication. American Society of Mechanical Engineers (ASME), PVP2014-28734. (ASME Pressure Vessels and Piping Division).

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

Pressure vessels
Yarn
Filament winding
Reels
Jamming
4 Citations (Scopus)

Forming limits of thermoplastic composites

Wolthuizen, D. J., Schuurman, J. & Akkerman, R., 7 May 2014, 17th Conference of the European Scientific Association on Material Forming, ESAFORM 2014. Espoo, Finland: Trans Tech Publications Ltd, p. 407-414

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

9 Downloads (Pure)

Investigation of process induced residual stresses and deformations for industrially pultruded parts having UD and CFM layers

Baran, I., Hattel, J. H. & Akkerman, R., 6 Mar 2014, Unknown. Lissabon, p. -

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

File
Construction industry
Residual stresses
Pultrusion
Composite materials
Wind power
1 Citation (Scopus)

Investigation of the Spring-In of a Pultruded L-Shaped Profile for Various Processing Conditions and Thicknesses

Baran, I., Hattel, J. H. & Akkerman, R., 7 May 2014, 17th Conference of the European Scientific Association on Material Forming, ESAFORM 2014. Espoo, Finland: Trans Tech Publications Ltd, p. 273-279

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

Resins
Pultrusion
Composite materials
Dynamic mechanical analysis
Processing

The Effect of Mandrel Configuration on the Warpage in Pultrusion of Rectangular Hollow Profiles

Baran, I., Hattel, J. H. & Akkerman, R., 2014, 17th Conference of the European Scientific Association on Material Forming, ESAFORM 2014. Espoo, Finland: Trans Tech Publications Ltd, p. 250-256

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

pultrusion
warpage
mandrels
hollow
profiles
19 Downloads (Pure)

Thermo-mechanical process modelling of industrially pultruded parts having UD and CFM layers

Baran, I., Hattel, J. H. & Akkerman, R., 22 Jun 2014, 16th European Conference on Composite Materials, ECCM 2014. Seville: European Conference on Composite Materials, ECCM, p. -

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

File
Residual stresses
Pultrusion
Curing
Polyesters
Resins
1 Citation (Scopus)
51 Downloads (Pure)

Vibro-Acoustic modulation based damage identification in a composite skin-stiffener structure

Ooijevaar, T. H., Loendersloot, R., Rogge, M. D., Akkerman, R. & Tinga, T., 8 Jul 2014, 7th European Workshop on Structural Health Monitoring. Le Cam, V., Mevel, L. & Schoefs, F. (eds.). Nantes (F), p. 544-551

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

File
damage
modulation
composite materials
acoustics
impact loads
2013
1 Citation (Scopus)

Braiding take-up speed optimization - case studies

van Ravenhorst, J. H., Rietman, B. & Akkerman, R., 28 Jul 2013, 19th international conference on composite materials. Hoa, S. V. & Hubert, P. (eds.). Montreal, Canada: Electronic Publishing BytePress.com, p. -

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

Resin transfer molding
Yarn
Geometry
Fibers
Composite materials
2 Citations (Scopus)
60 Downloads (Pure)

Experimental characterisation of recycled (glass/tpu woven fabric) flake reinforced thermoplastic composites

Abdul Rasheed, M. I., Rietman, B., Visser, R. & Akkerman, R., 2013, ICCM19: Proceedings of the 19th international conference on composite materials. Hoa, S. V. & Hubert, P. (eds.). New York: Curran Associates, p. 3999-4010

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

File
glass
matrix
stiffness
elastic property
adhesion
27 Downloads (Pure)

FibreChain: characterization and modeling of thermoplastic composites processing

Rietman, B., Niazi, M. S. & Akkerman, R., 19 Sep 2013, Texcomp-11 conference. Lomov, S. V. (ed.). Leuven, Belgie, p. -

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademic

File
Thermoplastics
Composite materials
Processing
Materials properties
Melting
30 Downloads (Pure)

Influence of moisture content on impact properties of flax fibre reinforced polymers

Jansma, S. H., Rietman, B., Warnet, L. & Akkerman, R., 19 Sep 2013, TexCompu-11 conference. Lomov, S. V. (ed.). Leuven, Belgium, p. -

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademic

File
2 Citations (Scopus)

Investigation of PVC physical ageing in field test specimens using ultrasonic and dielectric measurements

Demcenko, A., Ravanan, M., Visser, R., Loendersloot, R. & Akkerman, R., 7 Oct 2013, 2012 IEEE international ultrasonics symposium (IUS). Dresden: IEEE, p. 1909-1912

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

field tests
ultrasonics
cracks
microcracks
wave interaction
1 Citation (Scopus)

Modeling of the Austenite-Martensite Transformation in Stainless and TRIP Steels

Geijselaers, H. J. M., Hilkhuijsen, P., Bor, T. C., Perdahcioglu, E. S. & van den Boogaard, A. H., 6 Jul 2013, The 11th International Conference on Numerical Methods in Industrial Forming Processes. Zhang, S-H., Liu, X-H., Gheng, M. & Li, J. (eds.). American Institute of Physics, p. 175-182 (AIP conference proceedings; vol. 1532).

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

steel
modeling
texture
thermodynamics
3 Citations (Scopus)

Non-collinear wave mixing for a bulk wave phase velocity measurement in an isotropic solid

Demcenko, A., 7 Oct 2013, 2012 IEEE International Ultrasonics Symposium (IUS). Dresden: IEEE, p. 1437-1440

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademic

velocity measurement
phase velocity
S waves
longitudinal waves
wave interaction
2 Citations (Scopus)
1 Downloads (Pure)

Nonlinear dynamic behavior of impact damage in a composite skin-stiffener structure

Ooijevaar, T. H., Rogge, M. D., Loendersloot, R., Warnet, L., Akkerman, R. & de Boer, A., 2013, Proceedings of the 9th International Workshop on Structural Health Monitoring 2013. Chang, F. K. & Guemes, A. (eds.). Lancaster, PA, USA: DEStech Publications, Inc, p. 445-453

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

Modal analysis
Composite structures
Delamination
Wave propagation
Analytical models
2 Citations (Scopus)

Optical and electrical properties of SnO2 thin films after ultra-short pulsed laser annealing

Scorticati, D., Illiberi, A., Römer, G. R. B. E., Bor, T., Ogieglo, W., Klein Gunnewiek, M., Lenferink, A., Otto, C., Skolski, J. Z. P., Grob, F., de Lange, D. F. & Huis in 't Veld, A. J., 25 Aug 2013, Laser material processing for solar energy devices II. Reutzel, E. W. (ed.). San Diego, CA, USA: SPIE, p. 1-12 12 p. (Proceedings of SPIE).

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

ultrashort pulsed lasers
laser annealing
electrical properties
optical properties
thin films
65 Downloads (Pure)

Optimisation of the circular braiding process

van Ravenhorst, J. H. & Akkerman, R., 16 Sep 2013, TexComp-11 conference. Lomov, S. V. (ed.). Leuven, p. -

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademic

File
Yarn
Geometry
38 Downloads (Pure)

Pull-off strength assessment of co-consolidated AS4/PEEK T-joints

Rietman, B. & Akkerman, R., 11 Sep 2013, 8th SAMPE Europe Technical Conference & Table Top Exhibition 2013 (SETEC 2013): Novel Aspects in Composite Technologies: from Fibre to Lightweight Structures. Ermanni, P. (ed.). Curran Associates, p. 163-170

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademic

File
Polyether ether ketones
Joining
Autoclaves
Composite structures
Tapes
2012
71 Downloads (Pure)

A comparative study of heating elements used for the development of textile heaters

Petcu, I., Agrawal, P., Curteza, A., Visser, R., Brinks, G. & Teodorescu, M., 13 Jun 2012, Book of proceedings 12th World Textile Conference AUTEX 2012. Mijović, B. (ed.). Zadar, Croatia: Faculty of Textile Technology of the University of Zagreb, p. -

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

File
Electric heating elements
Textiles
Heating
Black coatings
Carbon black
36 Downloads (Pure)

Failure Modeling of Thermoplastic Butt-Joint Stiffened Panels by Quasi-Static Loading

Ilin, K., Warnet, L., Rietman, B., Akkerman, R. & ten Thije, R. H. W., 15 May 2012, 2012 SIMULIA Community Conference. Providence RI, USA, p. 63-69

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademic

File
1 Citation (Scopus)

Free surface modeling of contacting solid metal flows employing the ALE formulation

van der Stelt, A. A., Bor, T. C., Geijselaers, H. J. M., Akkerman, R. & Huetink, H., 14 Mar 2012, The 15th International ESAFORM Conference on Material Forming 2011 Proceedings. Merklein, M. & Hagenah, H. (eds.). Erlangen: Trans Tech Publications Ltd, p. 431-436

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

formulations
metals
friction stir welding
finite element method
boundary conditions
16 Downloads (Pure)

Influence of the Level of Gelation on Physical Ageing Kinetics of uPVC Pipes

Drenth, E., Bor, T. C., Visser, R. & Wolters, M., 1 Apr 2012, Proceedings of the 15th International Conference on Deformation, Yield and Fracture of Polymers. McKenna, G. B. & Govaert, L. E. (eds.). Kerkrade, the Netherlands, p. 194-197 4 p.

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

File
gelation
kinetics
gases
water
14 Downloads (Pure)

Influence of ultrasonic radiation on the amorphous zeolite - Portland cement system

Jakevicius, L., Vaiciukyniene, D. & Demcenko, A., 14 May 2012, Proceedings of the 4th International Conference on Radiation Interaction with Material and its Use in Technologies 2012. p. 550-553

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

File
46 Downloads (Pure)

Non-destructive and in-situ determination of the degree of gelation of pvc pipes

Drenth, E., Bor, T. C., Visser, R. & Wolters, M., 24 Sep 2012, Plastic Pipes XVI. Davidovski, Z. (ed.). Barcelona, Spain, 10 p.

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademic

Open Access
File
pipe
nuclear magnetic resonance
laser
indentation
crystallinity
38 Downloads (Pure)

Performance of inkjet-printed structures on different substrate materials under high humidity and elevated temperature conditions

Palacios-Aguilera, N. B., Visser, R., Vargas-Llona, L. D., Balda Irurzun, U., Sridhar, A., Akkerman, R. & Bossche, A., 17 Sep 2012, 4th Electronic System-Integration Technology Conference (ESTC). Amsterdam: IEEE, p. -

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademic

File
Atmospheric humidity
Adhesion
Substrates
Temperature
Printing
33 Downloads (Pure)

Shear Characterisation of UD Thermoplastic Composites

Haanappel, S., Sachs, U., ten Thije, R. H. W., Rietman, B. & Akkerman, R., 2012, 11th International Conference on Flow Processing in Composite Materials (FPCM-11). Bickerton, S. & Kelly, P. (eds.). Auckland, New Zealand: University of Auckland, p. - 8 p.

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

File
Shear strain
Thermoplastics
Polyether ether ketones
Photogrammetry
Composite materials
20 Downloads (Pure)

Simulation of Flexible Mechanisms in a Rotating Blade for Smart-Blade Applications

Paternoster, A., Loendersloot, R., de Boer, A. & Akkerman, R., 4 Sep 2012, Proceeding of the European Rotorcraft Forum. Amsterdam: ERF, p. 1-8 8 p.

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademic

File
Aerodynamics
Helicopters
Software packages
Mach number
Vibrations (mechanical)