1. |
- Berbyuk, Viktor, 1953
(author)
-
Inverse dynamics and Fourier-based approach to solve optimal control problems for multi-link mechanisms
- 1997
-
In: The NATO Advanced Study Institute on Computational Methods in Mechanisms. ; 2, s. 431-440
-
Conference paper (peer-reviewed)abstract
- This paper is concerned with the investigation of multi-link mechanism controlled motion between fixed boundary conditions and given constraints on the phase coordinates. The moduli of the controlling moments at the hinges between the links are bounded. A computational method to the mathematical modeling of the optimal control laws which govern multi-link mechanism reaching motion is presented. This method is based on Fourier and spline approximations of the independently variable functions and inverse-dynamics approach. The method proposed makes it possible to satisfy the boundary conditions and some constraints on the phase coordinates automatically and accurately. The efficiency of the proposed method is illustrated by the solution of the energy-optimal control problem of a plane mobile three-link manipulator with a load on the grip.
|
|
2. |
|
|
3. |
- Larsson, Lars, 1945
(author)
-
CFD as a Tool in Ship Design
- 1994
-
In: Proceedings CFD Workshop Tokyo.
-
Conference paper (other academic/artistic)
|
|
4. |
|
|
5. |
- Jerrelind, Jenny, et al.
(author)
-
Braille printer Dynamics
- 1999
-
In: Proceedings of the ASME Design Engineering Technical Conferences.
-
Conference paper (other academic/artistic)
|
|
6. |
- Tinnsten, Mats
(author)
-
Numerical and experimental study of acoustic and structural optimization
- 1999
-
Doctoral thesis (other academic/artistic)abstract
- The main objective with this thesis has been to create a procedure (method and program code) that enables automatic optimization of acoustic response from vibrating structures. Automatic means that the proposed method, on its own, should be able to find the desired acoustic quantities for a given problem formulation by altering given variables. The main parts of such an optimization process are: availability to perform structural dynamic analysis, acoustic analysis, and optimization analysis. The structural dynamic analysis comprises eigenmode and response analyses, tools necessary to calculate surface velocities for the actual structure. These calculations are performed using a modified version of the finite element (FE) code FEMP [31]. This FE code is implemented in the acoustic optimization code and used in Papers B, C, D, E, and F. The surface velocities are used as input in the acoustic analyses. The acoustic analyses in this thesis comprises calculation of sound pressure and/or sound intensity amplitudes in specified regions outside vibrating structures surrounded by air. Calculation of the acoustic quantities (pressure and intensity) is performed using a boundary element (BE) code. The BE code is developed and used in Papers C, D, E, and F. The numerical results in Paper C is compared with experimental results A slightly modified version of the optimization routine MMA (method of moving asymptotes) [21] is used for optimization analysis together with the above-mentioned FE and BE codes. The MMA is in Paper A used for a purely structural optimization problem. The acoustic optimization process, comprising FE, BE, and optimization analysis, is performed in Papers D, E, and F. A comparison between numerical and experimental results was also performed in Paper F.
|
|
7. |
|
|
8. |
|
|
9. |
- Drugge, Lars, et al.
(author)
-
The nonlinear behaviour of a pantograph current collector suspension
- 1999
-
In: Proceedings of the 1999 ASME Design Engineering Technical Conferences.
-
Conference paper (peer-reviewed)abstract
- The pantograph-catenary system is a critical component for trains required to run at higher speeds. The pantograph often includes nonlinear characteristics and the scope of this work is to investigate if nonlinear dynamic phenomena can occur in an existing design. A model of a pantograph suspension subsystem has been developed according to physical parameter values of the head suspension of the Schunk WBL88/X2 pantograph, providing electric power to the Swedish high-speed train X2. Studies of the system response for different force excitation show both harmonic, subharmonic and chaotic behaviour for the investigated parameter regions.
|
|
10. |
|
|