Carlo Bottasso - Academia.edu (original) (raw)

Papers by Carlo Bottasso

Test bed: three-bladed 3.0MW horizontal-axis wind turbine, modeled using Cp-Lambda multibody/FEM ... more Test bed: three-bladed 3.0MW horizontal-axis wind turbine, modeled using Cp-Lambda multibody/FEM simulation environment Model identification: -12 wind speeds between 5 and 25 m/sec -11 yaw angles between -48 and +48 deg for each wind speed -5 shear coefficients between 0.0 and 0.4 for each wind speed

Test bed: three-bladed 3.0MW horizontal-axis wind turbine, modeled in Cp-Lambda multibody/FEM sim... more Test bed: three-bladed 3.0MW horizontal-axis wind turbine, modeled in Cp-Lambda multibody/FEM simulation environment Model identification: -12 wind speeds between 5 and 25 m/sec -11 yaw angles between -48 and +48 deg for each wind speed -5 shear coefficients between 0.0 and 0.4 for each wind speed

A LiDAR sensor scans a volume upstream of the rotor with light beams, collecting wind speed sampl... more A LiDAR sensor scans a volume upstream of the rotor with light beams, collecting wind speed samples by measuring the time between light emission and reflection.

32nd ASME Wind Energy Symposium, 2014

Journal of Wind Engineering and Industrial Aerodynamics, 2014

We report on some preliminary results obtained with a metric-driven mesh optimization procedure f... more We report on some preliminary results obtained with a metric-driven mesh optimization procedure for simplicial meshes based on the Simulated Annealing method. The use of Simulated Annealing improves the chances of removing pathological clusters of bad elements, that have the tendency to lock into frozen conflgurations in di-cult regions of the model such as corners and complex face intersections, prejudicing the overall quality of the flnal grid. Numerical examples illustrate the efiectiveness of the proposed methodology and com- pare it to a classical greedy Gauss-Seidel optimization. Substantial improvement in the quality of the worst elements of the grid is observed for the Simulated Annealing optimiza- tion, motivating further study of a locally-adaptive version of the scheme currently under investigation.

European Journal of Mechanics a Solids, 1992

ABSTRACT The solution of the problem of motion of constrained multibody systems is achieved here ... more ABSTRACT The solution of the problem of motion of constrained multibody systems is achieved here by means of a method which makes use of the concept of orthonormal bases, thus identifying the feasible and unfeasible directions of the constraint. The unknown constraint reaction forces are eliminated by means of a projection process. It is shown how to recover the reaction forces, if they are needed. For the sake of generality, no particular form of the equations of motion is assumed a priori.

In this document, we consider the problem of parameter estimation from flight test data for rotor... more In this document, we consider the problem of parameter estimation from flight test data for rotorcraft vehicle models.

Computation Mech, 1992

In this work a three-field space-time beam finite element formulation is expressed in quaternion ... more In this work a three-field space-time beam finite element formulation is expressed in quaternion algebra. The unitary quaternion condition is enforced by means of an extension of the augmented Lagrangian method. The continuity requirements implied by the constrained energy principle obtained in this way lead to interpolations of the Lagrange multipliers which prove to be inappropriate when the beam is subject to certain boundary conditions. In particular, the tangent matrix becomes singular and the eigenvector of the multiplier degrees of freedom associated with the zero eigenvalue presents a checkerboard pattern. It is shown that this pathological behavior can be avoided if continuous-multiplier elements are employed.

... There are also many people who have helped me during my pursuit of the doctoral de-gree. Spec... more ... There are also many people who have helped me during my pursuit of the doctoral de-gree. Special thanks go to lab members Sang Min Jeong, Alessandro Spadoni and Stefano Gonella who have showed sincere help and concerns. Particularly, I would like to mention ...

... 1 Multi-Step Forward Dynamic Gait Simulation Matthew Millard, John McPhee, and Eric Kubica...... more ... 1 Multi-Step Forward Dynamic Gait Simulation Matthew Millard, John McPhee, and Eric Kubica..... 25 A Fast NCP Solver for Large Rigid-Body Problems with Contacts, Friction, and Joints Alessandro Tasora and Mihai Anitescu..... ...

44th AIAA Aerospace Sciences Meeting and Exhibit, 2006

Proceedings of the 16th International Conference on Information Fusion, Jul 9, 2013

In this paper, trajectory optimization and parameter estimation problems in vehicle dynamics are ... more In this paper, trajectory optimization and parameter estimation problems in vehicle dynamics are first defined using a unified notation. Next, it is shown that both can be formulated as two-point boundary value constrained optimization problems defined over a temporal domain of known or unknown duration. We further show that both can be discretized in time using the same algorithms, obtaining a constrained algebraic optimization problem which is formally identical in the two cases, and which can be solved using standard techniques. The unified formulation is exploited for developing a general purpose computer code for the solution of both classes of problems with applications in rotorcraft flight mechanics.