Sökning: "Linear Quadratic Gaussian"

Visar resultat 1 - 5 av 12 uppsatser innehållade orden Linear Quadratic Gaussian.

1. 1. Validation of the attitude control of KNATTE with flexible appendages

   Master-uppsats, Luleå tekniska universitet/Institutionen för system- och rymdteknik

   Författare :Christoffer Johansson; [2022]
   Nyckelord :KNATTE; flexible appendages; control; SMC; LQG; PWM; PWPF;

   Sammanfattning : The effect of flexible panels on a spacecraft during attitude movement may induce problems if not correctly accounted for in the control system for the spacecraft. The aim of this thesis is to find and evaluate, control algorithms that could be suitable for the Kinesthetic Node and Autonomous Table-Top Emulator (KNATTE) with two flexible mock-up solar panels during an attitude movement of 20 degrees. LÄS MER

3. 2. Modelling and testing of a solar panel structure for KNATTE (Kinesthetic Node and Autonomous Table-Top Emulator)

   Master-uppsats, Luleå tekniska universitet/Institutionen för system- och rymdteknik

   Författare :Elena Fernández Bravo; [2021]
   Nyckelord :Frictionless platform; Linear Quadratic Gaussian; Flexible appendages; Finite Element Method;

   Sammanfattning : One of the challenges that satellites face is the interaction between control movement and vibration of flexible appendages such as solar arrays and antennas that can negatively affect the performance of the spacecraft. The aim of this thesis is to develop a numerical model of a solar panel structure for KNATTE, a frictionless platform developed by the Onboard Space Systems group at Luleå University of Technology, and develop a control law that reduces the flexible vibration of the solar arrays when attitude control manoeuvres are performed. LÄS MER

4. 3. Active Control of High­-Speed Flexible Rotors on Controllable Tilting­-Pad Journal Bearings : Theory and Experiment

   Uppsats för yrkesexamina på avancerad nivå, Blekinge Tekniska Högskola/Institutionen för maskinteknik

   Författare :Paul-Henrik Bull; [2021]
   Nyckelord :ATPJB; Fluid-Film Lubrication; Model based control; Vibration Control;

   Sammanfattning : A common choice of bearing for industrial applications such as turbomachinery and rotating compressors is the Tilting-Pad Journal Bearing (TPJB) due to its excellent stability properties. TPJB's are however limited by the reduction of damping in the fluid film at high velocities. LÄS MER

5. 4. A study on the application of machine learning algorithms in stochastic optimal control

   Master-uppsats, KTH/Matematisk statistik

   Författare :Xin Huang; [2019]
   Nyckelord :;

   Sammanfattning : By observing a similarity between the goal of stochastic optimal control to minimize an expected cost functional and the aim of machine learning to minimize an expected loss function, a method of applying machine learning algorithm to approximate the optimal control function is established and implemented via neural approximation. Based on a discretization framework, a recursive formula for the gradient of the approximated cost functional on the parameters of neural network is derived. LÄS MER

7. 5. Balschke Products and Their Critical Values

   Kandidat-uppsats, KTH/Skolan för teknikvetenskap (SCI)

   Författare :Jakob Sundbald; [2018]
   Nyckelord :;

   Sammanfattning : This paper concerns the problem of defining and computing a Blaschke product from a prescribed set of critical values. First a mathematical and theoretical background to Blaschke products and their critical values is presented, e.g. the Blaschke condition, important characteristics of finite Blaschke products and the uniqueness theorem. LÄS MER