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.
Results
Showing 1 to 13 of 13 for “"Torsional Spring"”.
-
A novel torsional spring design for knee prostheses and exoskeletons
In this thesis, a novel torsion spring design for use in knee prostheses and exoskeletons is presented and analyzed. The planar spring design features an outer hub and an inner hub, which are connected by slender beams and store torsion energy in beam bending. The beams are fixed to the outer hub …
-
Sagittal plane characterization of normal human ankle function across a range of walking gait speeds
… plantarflexion is characterized by a linear, torsional spring. The work done by the spring increases with gait speed, and while gait speed is constant, the work is kept constant by modulating the stiffness from stride to stride. Ankle function during controlled dorsiflexion is characterized by …
-
Designing of a solar panel deployment mechanism for small satellite
… In this regard, we are aiming to use the torsional spring to induce the required torque for the deployment. There has been a considerable amount of research work [1-4] for a robust deployment mechanism to deploy the solar panel reliably without compromising on the overall cost and strength …
-
Force-controllable ankle foot orthosis (AFO) to assist drop foot gait
… foot gait. To prevent foot slap, a biomimetic torsional spring control is applied where orthotic joint stiffness is actively adjusted to minimize forefoot collisions with the ground. Throughout late stance, joint impedance is minimized so as not to impede powered plantar flexion movements, and …
-
Modeling and identification of flexible joints in vehicle structures
… planes. The model parameters consist of torsional spring rates, the coordinates of the flexible hinges, and the orientations of planes in which the torsional springs are located. The model parameters are selected to be physically meaningful. In some cases, the behavior of joints can be …
-
Vibration localization and statistical energy analysis in coupled systems
… Two single Euler-Bemouilli beams coupled by a torsional spring constitute the multi degree of freedom extension of the study. Special care is given to show the variation of the natural frequencies \with the two parameters and modal overlapping is shown. The study of the response to harmonic …
-
Simulations of a passively actuated oscillating airfoil using a discontinuous Galerkin method
… space to a manageable region of interest. A torsional spring is placed at the foil's leading edge to passively modulate the pitch while the foil is harmonically heaved.
-
Active pitch control of an oscillating foil with biologically-inspired boundary layer feedback
… the pivot point of the wing. We also include a torsional spring at the pivot point to model passive aeroelasticity, following prior work by Israeli [5]. Our results show that hair sensors are well-suited for detecting flow separation, and sensors placed near the leading edge enable better light …
-
Individual plantar flexor compensation during walking with a unilateral passive dynamic ankle-foot orthosis : a simulation study
… a special class of orthoses that function like a torsional spring, which store elastic energy in early stance and release that energy in late stance to supplement impaired muscle (e.g. plantar flexor) force output. Although PD-AFOs have been beneficial to a variety of patient populations, a …
-
Flexural Mechanics of Creased Thin Metallic Strips
… as singular hinge lines, often accompanied by a torsional spring to provide some opening resistance; however, the appropriate stiffness of these springs is unclear. In reality, creases have a discrete geometry based on the method they were formed. This dissertation investigates the flexural …
-
Large-Displacement Linear-Motion Compliant Mechanisms
… characteristic called virtual axial stiffness. Torsional stiffness is normalized by a performance characteristic called the characteristic torque. Because large-displacement compliant mechanisms are often characterized by non-constant axial and off-axis stiffnesses, these normalized stiffness …
-
Synthesis and Design of a Bimodal Rotary Series Elastic Actuator
A novel rotary series elastic actuator (RSEA) with a two-mode, or bimodal, elastic element was designed and tested. This device was developed to eliminate the compromise between human safety and robot performance. Rigid actuators can be dangerous to humans within a robot's workspace due to impacts …
-
Robust scheduling control of aeroelasticity.
… dependence on airspeed and linear dependence on torsional stiffness. Using a variety of techniques the parameters of the NATA are identified, and shown through nonlinear simulation to provide excellent agreement with experimental results. It is also argued that structural nonlinearity, in the way …