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 14 of 14 for “"Spring force"”.
-
Characterization of an Electromagnetic Tuned Vibration Actuator
… With the electromagnetic field determined, the force to displacement relation between the stationary magnet and the absorber electromagnet is calculated. The best fit is determined to be an inverse square relationship. Once the spring force relation is determined, the damping mechanisms are …
-
Orbital stability in a classical pilot-wave system
… the presence of a rotating frame and a central force. We find that orbital quantisation is most pronounced when the waves generated by each bounce decay slowly. The wave decay rate, in turn, is related to the concept of path memory, the number of prior impacts with the bath that affect the …
-
Efficient control of series elastic actuators through the exploitation of resonant modes
… tasks. Series elastic actuators have a spring intentionally placed at the actuator output that provides good force resolution and filters out high frequency disturbances from the environment. These properties are essential for robotic applications in which interactions with the …
-
Rotational movement of a harbor seal whisker during vortex induced vibrations
… holding it to rotation only, rotation with spring force, and rotation with vibration showed that the whisker experienced the effects of the Munk moment at higher speeds when allowed to vibrate, also the rotational vibration of the whisker was noisy except when allowed to vibrate in the …
-
Continuous production of conducting polymer
… carbon crucible was peeled off using a blade and spring force mechanism. The temperature, current, and voltage of the electrodeposition were recorded. Several successful, but short, continuous deposition trials were run at a current density of 0.5 A/m² and a film 50 mm long and 0.246 mm thick was …
-
Design and Evaluation of an Underactuated Lower Body Exoskeleton
… the user's foot and their waist by compressing a spring in parallel with the user's leg during Stance Phase. The exoskeleton has a mass of 14.0 kg (30.8 lbs) and was tested up to a supplied spring force of 323.6 N (72.75 lbf) which equates to around 161.8 N (36.38 lbf) of assistive force at the …
-
Physics and Applications of a PDMS Based Centrifugal Microfluidic System
… tested. The first one is based on the magnetic force and the second one is on the basis of spring force and the last one is a membrane valve. All valving system demonstrate good control of the fluid movement. The latter two valves are capable of sequential control. It proves that the flyball …
-
RIDDS: Removal of Irregular Debris Using Double Nets
… that the mechanism can successfully recompress springs and launch multiple nets. It is recommended that improvements be made to prevent spring bending and the masses from not fully deploying, make changes to increase the spring force, time be spent fully integrating the stepper motor, and that …
-
The steady-state and dynamic performance of gas lubricated uniform film porous thrust bearings
… the analysis. The experimental results for the forced vibration tests are presented as dimensionless performance character istics as represented by dynamic spring force and damping force and it is found that the simple linear model breaks down for large amplitudes of vibration.
-
Registration of images containing rigid structures using deformable models and its medical application
… is proposed in this thesis that uses a flexible spring-mass system to provide a good representation of image information. Anatomical structures are represented by spring masses and their interconnecting springs located along the structure boundaries. Hence, the system can treat some pre-selected …
-
Rheological characterization of polymers via dissipative particle dynamics
… which interact with each other via, pairwise forces. The method was first introduced in the early 1990's, and has since undergone a number of refinements which have put it on a firm thermodynamic footing. DPD is notable for the flexibility it presents the modeler for building complex fluid …
-
Efficient techniques for soft tissue modeling and simulation
… and ChainMail, we have implemented a mass spring system because of its acceptable accuracy and speed. Mass spring systems have, however, some drawbacks such as, the determination of simulation coefficients with their iterative nature. Given the correct parameters, mass spring systems can …
-
A study of a piezoelectric energy harvesting system using magnetorheological fluids
This thesis reports the study of a piezoelectric energy harvesting system using a thin layer of magnetorheological fluid as a soft impact mechanism to enhance the frequency of the energy generator. Currently, the major bottleneck of vibration energy harvesting is the dynamic nature of vibrations in …
-
Single molecule DNA dynamics in micro- and nano-fluidic devices
… in confinement is induced by a modified spring force law, which is essentially related to the extension-dependent steric interactions between DNA and the confining walls. We also study aspects of the equilibrium conformation and dynamics of DNA in slit-like confinement in order to provide …