Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 25 for “"Euler angles"”.
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Analysis of crystallographic texture information by the hyperspherical harmonic expansion
… that orientations be described by sets of Euler angles, the field of texture analysis suffers from the inherent limitations of Euler angles. These include difficulty of presentation and interpretation, discontinuous changes in the description of a changing orientation, and singularities in …
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Nonlinear flexural-flexural-torsional dynamics of metallic and composite beams
… law, a transformation using three consecutive Euler angles, and Taylor expansions is used to develop three nonlinear integro-differential equations describing the flexural-flexural-torsional vibration of metallic and composite beams. The twisting curvature is used to define a physical twisting …
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Optical and X-ray study of the low plagioclases
… directions b*, c, and A by means of Euler angles Φ, θ, and ψ introduced by Burri et al. (1967) and to the crystallographic axes a, b*, and C by a set of new Euler angles θ₁, θ₂, and θ₃.
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Output feedback rotational maneuvers and vibration damping of Nasa Scole system by inversion theory
… development of two control systems based on (i) Euler angles or (ii) angular velocity components as output variables for large rotational maneuvers and vibration suppression of the SCOLE System. Nonlinear inversion theory is used for the design. The design approach taken here is to decompose the …
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Looking for a Simplicity Principle in the Perception of Human Walking Motion
… based on a model of 15 rigid body segments with Euler angles and a Cartesian translation for each. Both of our schemes are principal component (PC)-based implementations of a norm-based multidimensional object space – a type of model for high level perceptual schemes that has received attention …
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Dynamic and Control of Air-Bearing Spacecraft Simulator
… of the robot can be derived utilizing a Newton-Euler recursive approach. By beginning with a simple pendulum, then adding links (degrees of freedom) to more closely resemble the Sawyer arm, the equations of motion for the robot can be developed. After the equations of motion for the robot are …
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Dynamics of an unbalanced ring spinning on a rough horizontal surface
… motion is represented by a 1-2-3 set of Euler angles. The kinetic motion equations are derived with the use of Newton's second law and Euler's rotational motion equations. The types of motion considered are the pure-rolling and rolling-with-slipping motions. Given favorable initial …
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Optimization-based control and planning for highly dynamic legged locomotion in complex environments
… avoids the singularity issue associated with Euler angles. Motion planning algorithms are developed for planar-legged robot traversing challenging terrains. Dynamic trajectories that simultaneously reason about contact, centroidal dynamics, and joint torque limit are obtained by solving …
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Improving attitude determination and control of resource-constrained CubeSats using unscented Kalman filtering
… The quaternion estimates were converted to Euler angles to improve ease of interpretation. For the majority of the missions, the mean total Euler angle estimation error improvement ranged from 83% - 98% with error variance decreased by as much as 98%. One implementation had more than a two …
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Maneuver analysis for spinning thrusting spacecraft and spinning tethered spacecraft
… closed-form solutions for the angular velocity, Euler angles, inertial velocity, and inertial displacement solutions with nonzero initial conditions. Using the closed-form solutions, the effect of variations in the spin-axis moment of inertia and spin-rate on the spacecraft velocity pointing …
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Integrability, localisation and bifurcation of an elastic conducting rod in a uniform magnetic field
… system is reduced using the Casimirs, via the Euler angles, to a four-dimensional canonical system with a first integral provided the magnetic field is not aligned with the force within the rod at any point as the system losses rank. An energy surface is specified, defning three-dimensional …
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Attitude control on manifolds via optimization and contractions with automatic gain tuning
… the attitude is often parameterized by Euler angles or unit quaternions which exhibit problems such as gimbal lock or ambiguity in representation, respectively. These complications prevent the controllers from achieving global stability and worse they may cause real physical harm due to …
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Electron spin resonance study of single crystals of cytochrome P450 from Pseudomonas putida
… axes. The results are expressed in terms of the Euler angles (alpha, beta, gamma) rotating the crystal axes (c,b,a) onto the g-tensor axes (x,y,z). The O best fits of (alpha, beta, gamma) were (0,-80.-100) for m , (3,-70,-103) for 8=1/2 os os m , and (O,-95.~115) for 8=5/2 m , ,where an …
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Characterization of inertial measurement unit placement on the human body upon repeated donnings
… and account for the changes in position and Euler angles due to natural human variability and calibration during multiple donnings of IMUs by non-experts. This study will aid in the development of quick don and doff sensor suites that can be reliably used by a non-expert for real-time …
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A Study of Dynamics and Stability of Two-Craft Coulomb Tether Formations
… rate, while the thruster feedback is in terms of Euler angles and their rates. This hybrid feedback control is designed to asymptotically stabilize the satellite formation shape and attitude while avoiding plume impingement issues. The relative distance between the two satellites can be increased …
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Applicability of IMU in Clinical Research: Improving Upper Limbs Sensor-to-segment Calibration
Inertial Measurement Units (IMU) represent a staple in contemporary motion tracking technology, and they have countless applications in sports, animation, clinical research and biomechanics due to their portability, reliability and low cost. However, several challenges related to orientation …
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Characterizations on bacterial photosynthesis and respiration with optical spectroscopy and magnetic resonance
… and methyl with 13C shows that the dihedral angles of methoxy substituents on the semiquinone ring are no longer fixed in the LM dimer, in accordance with the loosened semiquinone binding pocket. For the respiration section, the semiquinone pocket in the bo3 oxidase from Escherichia coli is …
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Investigation of the quinone sites in reaction centers from Rhodobacter sphaeroides by pulsed EPR and spectral simulations
… by site-specific 13C labeling. The dihedral angles of the methoxy groups with respect to the quinone plane are estimated by comparing the hyperfine couplings with Density Functional Theory calculations. The difference in the QA and QB 2-methoxy dihedral angles is found to contribute at least …
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On the motion of a symmetric rigid body with a "yo-yo" despin device attached
… vectorial methods of Newtonian mechanics. The Euler equations for a rigid body are used to describe the motion of the rigid body itself. The moment acting on the body through the tension in the yo-yo cables is unknown and it is necessary to apply the second law of Newton to a despin weight so …
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Body Motion Capture Using Multiple Inertial Sensors
… which body movements can be captured by applying Euler angle based algorithms, specifically, single rotation order algorithm and the optimal rotation order algorithm. According to the experiment results of capturing ten ADLs, both the single rotation order algorithm and the optimal rotation order …
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