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 20 of 20 for “"center of rotation"”.
-
Angular limb deformities affecting the canine radius and ulna : classification using the center of rotation of angulation method
… complex ALDs would exhibit a higher incidence of concurrent joint radiographic disease. Medical records from 2006 to 2013 were searched and cases included of dogs diagnosed with thoracic limb lameness attributable to antebrachial ALDs with orthogonal radiographs or CT scans of the affected …
-
Motion perception with conflicting or congruent visual and vestibular cues
… the underlying mechanisms, and our understanding of some critical factors such as such as how the brain resolves the tilt-translation ambiguity is only now beginning to be understood. The otolith organs function like a three-axis linear accelerometer, responding to the vector difference between …
-
Predictive equations for bolted connections
… applying the ultimate strength/instantaneous center of rotation method was written to generate the eccentricity coefficients used for the study of this project. For single line bolted connections, the value of the eccentricity coefficient is determined by several independent variables: NR …
-
Exploration of Motion Capture System to Investigate Human Shoulder Kinematics
… as a ball-and-socket joint [1], and its center of rotation (COR) is presumed to coincide with the geometric center of the medial-superior region of the humeral head [2]. Recent research has endorsed improvements in COR estimation through invasive and noninvasive techniques, including …
-
Trackable Features Provide a Cue to the Angular Velocity of Rotating Objects
… velocity dependent upon its distance from the center of rotation, while the object as a whole rotates with a fixed angular velocity. Does the perceived rotational speed of an object correspond to its angular velocity, linear velocities, or some combination of the two? We had observers perform …
-
The Development and Optimization of a Teleoperated Four-Wheel Drive/ Four-Wheel Steer Vehicle
… gain and the gain to control instantaneous center of rotation coordinate Y (denoted y gain).Results concluded that the steering gain has a negligible effect on the handling characteristics while the y gain has a significant impact on the handling characteristics. It was also concluded that …
-
Scales modified for use on board the human centrifuge in the MIT Man Vehicle Lab
… is currently performing research on the effects of rotational artificial gravity on humans through the use of a short-radius centrifuge. The MVL centrifuge allows subjects to spin in the supine position with their heads at the center of rotation and their feet facing outwards. To collect …
-
Realization of dynamixel servo plant parameters to improve admittance control for a compliant human-robot interaction
In theory, admittance control offers a very effective method of implementing smooth human-robot interaction. It allows the user's applied force to control the movement of a powerful robot as if the robot were a small, passive mass. However, the real-world application of admittance control faces …
-
The effect of rotation on legibility of dot-matrix characters
… (clockwise or counterclockwise) and the angle of stimulus image rotation, and the target character's distance from the center of screen, which was also the center of rotation; the dependent variables were response time and response correctness. Significant effects were found in the angle of …
-
Decreasing Error in Functional Hip Joint Center Calculation using Ultrasound Imaging
The hip joint center (HJC) is needed for calculation of hip kinematics in various applications. In the functional method, the center is determined by moving femur with respect to acetabulum. A popular way for measuring this movement is through an optical motion capture system. This method is fast …
-
Wrist Motion Simulation With a Rigid Body Spring Model Comparing Different Elements Modeling Approaches
… were constructed based on a computed tomography of a cadaver wrist. Bony structures were assembled as a wrist model in the simulation software, RecurDyn. Articulations between wrist joint bones were modeled using gliding surfaces, each was attached to its bone surface and this articulation was …
-
A Kinematics-Based Testing Protocol to Study the Mechanics of the Human Lumbar Spine
<p>The objective of this work was to develop a new kinematics-based testing protocol to quantify the axial and shear force components and rotational moment properties of the human cadaveric lumbar motion segment unit (MSU) in response to specific kinematic inputs. Modern, non-fusion spinal devices …
-
Design and validation of a compact radius centrifuge artificial gravity test platform
… deconditioning that occurs as a result of prolonged exposure to microgravity. To date, the study of artificial gravity has been done using bedrest and SRC's with subjects positioned radially with the head at the center of rotation. A recent proposal to put a human centrifuge on the …
-
Adaptive Control and Estimation of the Center of Mass of a 5-degree-of-freedom Spacecraft Testbed
… provide virtually frictionless translational and rotational motion. However, when frictionless rotational motion is achieved, the testbed becomes highly sensible gravity torque. This external torque is produced by the offset between the predetermined geometrical center of rotation (<em>CoR</em>) …
-
A Passive Pure Moment Protocol for Testing Spine Segments: Development and Application
… for performing in-vitro biomechanical testing of spinal devices. Published studies predominantly report range of motion and flexibility data, but information regarding the segment center of rotation is also relevant. Most current pure moment platforms are not sensitive enough to accurately …
-
Robotic Simulation of Disc Arthroplasty Surgery: Influence of Surgical Placement on Motion Segment Dynamics
<p>A variety of total disc replacement (TDR) designs exist for the treatment of disc pathologies. A key design parameter for a constrained ball and socket device is the location of the fixed center of rotation (COR). A previous study demonstrated that intact motion segment unit (MSU) mechanics and …
-
Biomechanical analysis of carpal flexion and extension
… to evaluate the relations between active range of motion (ROM) and upper limb anthropometric dimensions. Eight anthropometric dimensions, forearm length, distal and proximal forearm circumferences, wrist breadth, wrist thickness, wrist circumference, hand breadth, and hand length in combination …
-
Soft Surface Roll Mechanics Parameters for Light Vehicle Rollover Accident Reconstruction
Light vehicle rollover accidents on soft surfaces can be modeled assuming constant drag with linear motion equations and other engineering principles. The concept of using segment average results to evaluate roll mechanics parameters throughout a roll sequence, and specifically, segment duration to …
-
Control of an autonomous tracked vehicle and arm using a rule-base reduction based fuzzy expert system
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-11 without embargo terms
-
On-board Robotic Multi-pinhole SPECT System for Region-of-interest (ROI) Imaging
… could potentially improve the effectiveness of radiation therapy. However, current on-board imaging systems are limited in their functional and molecular imaging capability. Single Photon Emission Computed Tomography (SPECT) is a candidate to achieve on-board functional and molecular imaging. …