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 20 for “"Semiactive"”.
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Semiactive Cab Suspension Control for Semitruck Applications
… control. A controller called Hierarchical SemiActive Control (HSAC) is designed and implemented to allow the no-jerk skyhook controller to adapt to the road conditions. It also incorporates an endstop controller to better handle the limited rattle space of the cab suspension. The …
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Experimental Evaluation of Semiactive Magneto-Rheological Suspensions for Passenger Vehicles
… schemes of skyhook, groundhook, and hybrid semiactive control. The quarter-car apparatus was constructed using materials from 80/20 Incorporated and a hydraulic actuation system from MTS. A dSPACE AutoBox was used both for controlling the MR dampers and acquiring data. The first task was to …
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On the Control Aspects of Semiactive Suspensions for Automobile Applications
This analytical study evaluates the response characteristics of a two-degree-of freedom quarter-car model, using passive and semi-active dampers, along with a seven-degree-of-freedom full vehicle model. The behaviors of the semi-actively suspended vehicles have been evaluated using skyhook, …
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Effect of Control Techniques on the Performance of Semiactive Dampers
… control methods have on the performance of semiactive dampers in controlling the dynamics of a single suspension (quarter car) model. The level of dynamic control of this model has a direct bearing on the ride comfort and vehicle handling, when the single suspension is interpreted as a …
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Transient Motion Control of Passive and Semiactive Damping for Vehicle Suspensions
… representing a class 8 truck, using passive and semiactive dampers. The semiactive damper control policies that are examined include the previously developed policies of on-off skyhook, continuous skyhook, and on-off groundhook control, along with a newly developed method of fuzzy logic …
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Experimental Evaluation of Semiactive Magnetorheological Primary Suspensions for Heavy Truck Applications
This study evaluates the performance of a semiactive magnetorheological primary suspension on a heavy truck application. A set of magnetorheological dampers is designed, fabricated, and characterized. The set of magnetorheological test dampers are implemented on a Volvo VN heavy truck. An embedded …
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Using Magneto-Rheological Dampers in Semiactive Tuned Vibration Absorbers to Control Structural Vibrations
… passive TVAs. This study proposes a novel semiactive TVA, which strives to combine the best features of passive and active TVA systems. The semiactive TVA in this study includes a Magneto-Rheological (MR) damper that is used as a controllable damping element, for providing the real-time …
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On the Development of a Real-Time Embedded Digital Controller for Heavy Truck Semiactive Suspensions
A digital controller was designed for a semiactive primary suspension for a class 8 highway truck. The controller used a skyhook policy (where the semiactive damper simulates a damper between the sprung mass and an inertial reference) to control magneto-rheological dampers placed on the truck 's …
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Simulation studies and NEES fast hybrid experimental setup of a seismically excited nonlinear building with semiactive control
Includes bibliographical references (pages 111-120).
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An Investigation of the Effectiveness of Skyhook Suspensions for Controlling Roll Dynamics of Sport Utility Vehicles Using Magneto-Rheological Dampers
… many investigators have predicted that with a semiactive suspension it is possible to attain performance gains comparable to those possible with a fully active suspension. In achieving this, the method by which the damper is controlled is one of the crucial factors that ultimately determines …
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Model-Based Strategies for Real-Time Hybrid Testing
… structures incorporating devices for passive and semiactive structural control (e.g., MR dampers).
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Theoretical and experimental study on cable vibration reduction with a TMD-MR damper
… for vibration reduction, both passively and semiactively. Based on the obtained information, a TMD-MR damper is manufactured according to the vibration level of the experimental cable. The designed TMD-MR damper is then added to the experimental cable, and possible factors that may affect the …
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Development of a Visual Demonstration Platform for Parallel Evaluation of Active Suspension Systems
… of active components, such as actuators and semiactive dampers, coupled with dynamic control strategies, a more desirable compromise between the benefits of soft and stiff suspensions can be achieved. The purpose of this research is not to create a better suspension, but to investigate how …
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Switchgrass Cultivar, Harvest Frequency, Fertilizer Source, and Irrigation Effects on Near-Surface Soil Properties in West-Central Arkansas
… on a Leadvale silt loam (fine-silty, siliceous, semiactive, thermic, Typic Fragiudult) at the USDA-NRCS Booneville Plant Materials Center in Logan County by evaluating soil bulk density, total water stable aggregates (TWSA), soil pH and EC, Mehlich-3 extractable soil nutrients, root density, and …
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Impacts of managed realignment on low-lying coasts
… realistic nonlinear vehicle model for active and semiactive actuators is carried out and a comparison with a fixed passive system for realistic road profiles and handling manoeuvres is presented. The experimental testing on a prototype vehicle of the semi-active control algorithm developed in this …
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Belowground Carbon and Nitrogen Cycling in a Loblolly Pine Forest Managed for Bioenergy Production
… were mapped as Pantego (fine‐loamy, siliceous, semiactive, thermic Umbric Paleaquults) or Rains (fine‐loamy, siliceous, semiactive, thermic Typic Paleaquults) soil series, both of which are very poorly drained. However, previous site management in the late 1960’s and early 1970’s included …
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Magneto-Rheological Dampers for Super-sport Motorcycle Applications
In recent years, a flurry of interest has been shown for a relatively old technology called magneto-rheological fluids, or MR fluids. Multiple types of devices have been designed to implement this versatile fluid, including linear dampers, clutches, work-piece fixtures, and polishing machines. The …
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Application of Magnetorheological Dampers for Vehicle Seat Suspensions
This study evaluates and provides solutions to the problem of poor subjective feel of seat suspensions that employ magnetorheological (MR) dampers and skyhook control. An Isringhausen seat suspension that had been modified to replace the stock passive damper with a controllable MR damper was used …
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Design of Adaptive Vibration Control Systems with Applicaion to Magneto-Rheological Dampers
The design of nonlinear adaptive control systems for reducing vibration transmission in applications such as transportation systems is discussed. The systems studied include suspension systems, such as those used in vehicles, employing nonlinear magneto-rheological (MR) dampers that are controlled …
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MR vzpěra pro vibroizolační Stewardovu plošinu pro kosmonautiku
Práce se zabývá návrhem magnetoreologické vzpěry vibroizolačního adaptéru pro kosmonautiku. Pro její optimalizaci je nutné sestavit několik virtuálních modelů. Dynamický model mechanismu – Stewartovy plošiny, reologický model pro určení tlumicí síly MR tlumiče, model magnetického obvodu pro …