Sökning: "random vibration"

Visar resultat 6 - 10 av 25 uppsatser innehållade orden random vibration.

1. 6. Finite Element Analysis of Stresses in the MIST CubeSat due to Dynamic Loads During Launch

   Master-uppsats, KTH/Lättkonstruktioner

   Författare :Carl Järmyr Eriksson; [2021]
   Nyckelord :Satellite; CubeSat; Nanosatellite; Dynamic Loads; Launch Loads; Finite Element Analysis; FEA; Quasi-static Acceleration; Modal Analysis; Random Vibration; Shock Loads; satellit; CubeSat; nanosatellit; dynamiska laster; uppskjutningslaster; finita elementmetoden; FEM; kvasistatisk acceleration; modalanalys; stokastiska vibrationer; chocklaster;

   Sammanfattning : A finite element model of the CubeSat MIST was created, in order to assess the stresses that occur in the satellite in response to loads during its launch. Due to size limits of thesoftware used, simplifications had to be made to the geometry of the model. LÄS MER

3. 7. Design of semi-rigid cables for harsh vibration environment

   Master-uppsats, KTH/Hållfasthetslära

   Författare :Kajsa Hedin; [2020]
   Nyckelord :;

   Sammanfattning : This thesis investigates semi-rigid cables exposed to a harsh vibration environment. Thethesis includes the creation of a simulation model of the semi-rigid cables as well asdeveloping a set-up and performing a experimental vibration test. LÄS MER

4. 8. Transient and Spectral Fatigue Analysis for Random Base Excitation

   H-uppsats,

   Författare :Albin Bäckstrand; Prithviraj Madhava Acharya; [2019-09-16]
   Nyckelord :Spectral fatigue analysis; transient fatigue analysis; power spectral density PSD ; transfer function; base excitation; Dirlik s empirical formula; equivalent von Mises stress EVMS ; rainflow count; Wang and Brown s method; Dang Van equivalent stress; Palmgren-Miner rule;

   Sammanfattning : This thesis work gives an insight on how to estimate the fatigue damage using transient and spectral fatigue analysis for both uniaxial and multiaxial stress states in case of random vibration base excitation. The transient method involves a rainflow count algorithm that counts the number of cycles causing the fatigue damage, while the spectral method is based on probabilistic assumptions from which an expected value of fatigue damage can be estimated. LÄS MER

5. 9. Dynamic Analysis of Sinusoidal, Random and Shock Vibration according to Launch Environment for Small Spacecraft Development to Asteroid 2016-HO3

   Master-uppsats, KTH/Lättkonstruktioner

   Författare :Akhsanto Anandito; [2019]
   Nyckelord :spacecraft; resonance frequency; sinusoidal; random vibration; shock; FEM; rymdfarkoster; resonansfrekvens; sinusformad; slumpmässig vibration; chock; FEM;

   Sammanfattning : The investment of space commerce is skyrocketing and it is predicted to be a nascent business in the future. The spacecraft demand has been growing not only for NASA and other space agency’s mission but also collaboration business between small space industries, academia, and scientific community. LÄS MER

7. 10. Vibration Testing of Short Fibre Reinforced Polymer Composites

   Master-uppsats, KTH/Lättkonstruktioner

   Författare :Ben Morrissey; [2019]
   Nyckelord :;

   Sammanfattning : Applications of short fibre reinforced polymer composites (SFRPCs) have been rapidly increasing and most of the components made of these materials are subjected to cyclic loading. In automotive applications, “under the hood” is the harshest environmental condition for plastic-based materials with temperatures ranging from -40°C to 120°C. LÄS MER