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Book Optimum Shock and Vibration Isolation

Download or read book Optimum Shock and Vibration Isolation written by Eugene Sevin and published by . This book was released on 1971 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Vehicle Suspension Systems and Electromagnetic Dampers

Download or read book Vehicle Suspension Systems and Electromagnetic Dampers written by Saad Kashem and published by Springer. This book was released on 2017-09-04 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes the development of a new analytical, full-vehicle model with nine degrees of freedom, which uses the new modified skyhook strategy (SKDT) to control the full-vehicle vibration problem. The book addresses the incorporation of road bank angle to create a zero steady-state torque requirement when designing the direct tilt control and the dynamic model of the full car model. It also highlights the potential of the SKDT suspension system to improve cornering performance and paves the way for future work on the vehicle’s integrated chassis control system. Active tilting technology to improve vehicle cornering is the focus of numerous ongoing research projects, but these don’t consider the effect of road bank angle in the control system design or in the dynamic model of the tilting standard passenger vehicles. The non-incorporation of road bank angle creates a non-zero steady state torque requirement.

Book An Investigation of Vibration Isolation Systems Using Active Semi active and Tunable Passive Mechanisms with Applications to Vehicle Suspensions

Download or read book An Investigation of Vibration Isolation Systems Using Active Semi active and Tunable Passive Mechanisms with Applications to Vehicle Suspensions written by Hong Su and published by . This book was released on 1990 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Influence of Damping in Vibration Isolation

Download or read book Influence of Damping in Vibration Isolation written by Jerome E. Ruzicka and published by . This book was released on 1971 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book The Shock and Vibration Bulletin Part 2 Isolation and Damping Impact Blast

Download or read book The Shock and Vibration Bulletin Part 2 Isolation and Damping Impact Blast written by and published by . This book was released on 1978 with total page 235 pages. Available in PDF, EPUB and Kindle. Book excerpt: Partial contents: Isolation and Damping -- Specification of damping material performance, A reduced-temperature nomogram for characterization of damping material behavior, Computerized processing and empirical representation of viscoelastic material property data and preliminary constrained layer damping treatment design, New structural damping technique for vibration control, Vibrations of a compressor blade with slip at the root, Response of a helical spring considering hysteretic and viscous damping, Damping of an engine exhaust stack, Multi-variable optimization for vibration isolation of road vehicles, Isolation mounts for the HEAO-B x-ray telescope; Impact -- Bird impact loading, Frequency response and differentiation requirements for impact measurements, Structural response of earth penetrators in angle-of-attack impacts, Scaling and prediction of impact puncture of shipping casks for radioactive materials, and Finite element analysis of multicomponent structures in rigid barrier impacts; and Blast -- Testing piping constraint energy absorbers for reactor containment applications, Prediction of constrained secondary fragment velocities, Impedance techniques for scaling and for predicting structure response to air blast, and Probabilistic failure analysis of lined tunnels in rock.

Book The Shock and Vibration Bulletin Part 2 Keynote Physiological Effects Isolation and Damping

Download or read book The Shock and Vibration Bulletin Part 2 Keynote Physiological Effects Isolation and Damping written by and published by . This book was released on 1970 with total page 175 pages. Available in PDF, EPUB and Kindle. Book excerpt: ;Contents: Testing and modeling standing man's response to impact; Equal annoyance contours for the effect of sinusoidal vibration on man; Isolation from mechanical shock with a mounting system having nonlinear dual- phase damping; Interactive optimal design of shock isolation systems; Design of high-performance shock isolation systems; Elastic wave propagation in a helical coil with varying curvature and its application as an impact load disperser; Analysis of the inverting tube energy absorber; The effects of payload penetration and various analytical models on the design of a spherical crushable casing for landing energy absorption; Effect of free layer damping on response of stiffened plate structures; Vibration control by a multiple-layered damping treatment; Determination of damping properties of soft viscoelastic materials; Improving reliability and eliminating maintenance with elastomeric dampers for rotor systems; Effect of high polymer additives on diffuser flow noise; Hawk suspension system performance on M754 tracked vehicle.

Book The Shock and Vibration Bulletin Part 4 Damping and Machinery Dynamics

Download or read book The Shock and Vibration Bulletin Part 4 Damping and Machinery Dynamics written by NAVAL RESEARCH LAB WASHINGTON DC SHOCK AND VIBRATION INFORMATION CENTER. and published by . This book was released on 1983 with total page 163 pages. Available in PDF, EPUB and Kindle. Book excerpt: Contents: Experimental Investigation of Controlling Vibrations using Multi-Unit Impact Dampers; An Experimental Hybrid Model for a Bilinear Hysteretic System; Measurement and Analysis of Platform Damping in Advanced Turbine Blade Response; Vibration Damping Treatment for High Temperature Gas Turbine Applications; Experimental Measurement of Material Damping using Digital Test Equipment; Electronic Damping of a Large Optical Bench; Measurement of Structural Damping Using the Random Decrement Technique; Damped Pneumatic Spring as Shock Isolator-Generalized Analysis and Design Procedure; Analytical and Experimental Investigation of Rotating Blade Response Due to Nozzle Passing Frequency Excitation; Prediction of Critical Speeds, Unbalance and Nonsynchronous Forced Response of Rotors; Unbalance Response of a Single Mass Rotor Mounted on Dissimilar Hydrodynamic Bearings; Nonlinear Coupling Responses to Variable Frequency Excitations; Simple Approximate Models for a Class of Structures; Source Signature Recovery in Reverberant Structures; and Comparison of Statistical Energy Analysis and Finite Element Analysis Vibration Prediction with Experimental Results.

Book Development of Hybrid Electromagnetic Dampers for Vehicle Suspension Systems

Download or read book Development of Hybrid Electromagnetic Dampers for Vehicle Suspension Systems written by Babak Ebrahimi and published by . This book was released on 2009 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: Vehicle suspension systems have been extensively explored in the past decades, contributing to ride comfort, handling and safety improvements. The new generation of powertrain and propulsion systems, as a new trend in modern vehicles, poses significant challenges to suspension system design. Consequently, novel suspension concepts are required, not only to improve the vehicle's dynamic performance, but also to enhance the fuel economy by utilizing regeneration functions. However, the development of new-generation suspension systems necessitates advanced suspension components, such as springs and dampers. This Ph. D. thesis, on the development of hybrid electromagnetic dampers is an Ontario Centres of Excellence (OCE) collaborative project sponsored by Mechworks Systems Inc. The ultimate goal of this project is to conduct feasibility study of the development of electromagnetic dampers for automotive suspension system applications. With new improvements in power electronics and magnetic materials, electromagnetic dampers are forging the way as a new technology in vibration isolation systems such as vehicle suspension systems. The use of electromagnetic dampers in active vehicle suspension systems has drawn considerable attention in the recent years, attributed to the fact that active suspension systems have superior performance in terms of ride comfort and road-handling performances compared to their passive and semi-active counterparts in automotive applications. As a response to the expanding demand for superior vehicle suspension systems, this thesis describes the design and development of a new electromagnetic damper as a customized linear permanent magnet actuator to be used in active suspension systems. The proposed electromagnetic damper has energy harvesting capability. Unlike commercial passive/semi-active dampers that convert the vibration kinetic energy into heat, the dissipated energy in electromagnetic dampers can be regenerated as useful electrical energy. Electromagnetic dampers are used in active suspension systems, where the damping coefficient is controlled rapidly and reliably through electrical manipulations. Although demonstrating superb performance, active suspensions still have some issues that must be overcome. They have high energy consumption, weight, and cost, and are not fail-safe in case of a power break-down. Since the introduction of the electromagnetic dampers, the challenge was to address these drawbacks. Hybrid electromagnetic dampers, which are proposed in this Ph. D. thesis, are potential solutions to high weight, high cost, and fail-safety issues of an active suspension system. The hybrid electromagnetic damper utilizes the high performance of an active electromagnetic damper with the reliability of passive dampers in a single package, offering a fail-safe damper while decreasing weight and cost. Two hybrid damper designs are proposed in this thesis. The first one operates based on hydraulic damping as a source of passive damping, while the second design employs the eddy current damping effect to provide the passive damping part of the system. It is demonstrated that the introduction of the passive damping can reduce power consumption and weight in an active automotive suspension system. The ultimate objective of this thesis is to employ existing suspension system and damper design knowledge together with new ideas from electromagnetic theories to develop new electromagnetic dampers. At the same time, the development of eddy current dampers, as a potential source for passive damping element in the final hybrid design, is considered and thoroughly studied.

Book Development of a Semi active Intelligent Suspension System for Heavy Vehicles

Download or read book Development of a Semi active Intelligent Suspension System for Heavy Vehicles written by Nima Eslaminasab and published by . This book was released on 2008 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt: With the new advancements in the vibration control strategies and controllable actuator manufacturing, the semi-active actuators (dampers) are finding their way as an essential part of vibration isolators, particularly in vehicle suspension systems. This is attributed to the fact that in a semi-active system, the damping coefficients can be adjusted to improve ride comfort and road handling performances. The currently available semi-active damper technologies can be divided into two main groups. The first uses controllable electromagnetic valves. The second uses magnetorheological (MR) fluid to control the damping characteristics of the system. Leading automotive companies such as General Motors and Volvo have started to use semi-active actuators in the suspension systems of high-end automobiles, such as the Cadillac Seville and Corvette, to improve the handling and ride performance in the vehicle. But much more research and development is needed in design, fabrication, and control of semi-active suspension systems and many challenges must be overcome in this area. Particularly in the area of heavy vehicle systems, such as light armored vehicles, little related research has been done, and there exists no commercially available controllable damper suitable for the relatively high force and large displacement requirements of such application. As the first response to these requirements, this thesis describes the design and modeling of an in-house semi-active twin-tube shock absorber with an internal variable solenoid-actuated valve. A full-scale semi-active damper prototype is developed and the shock absorber is tested to produce the required forcing range. The test results are compared with results of the developed mathematical model. To gain a better understanding of the semi-active suspension controlled systems and evaluate the performance of those systems, using perturbation techniques this thesis provides a detailed nonlinear analysis of the semi-active systems and establishes the issue of nonlinearity in on-off semi-active controlled systems. Despite different semi-active control methods and the type of actuators used in a semi-active controlled system, one important practical aspect of all hydro-mechanical computer controlled systems is the response-time. The longest response-time is usually introduced by the actuator -in this case, controllable actuator - in the system. This study investigates the effect of response-time in a semi-active controlled suspension system using semi-active dampers. Numerical simulations and analytical techniques are deployed to investigate the issue. The performance of the system due to the response-time is then analyzed and discussed. Since the introduction of the semi-active control strategy, the challenge was to develop methods to effectively use the capabilities of semi-active devices. In this thesis, two semi-active control strategies are proposed. The first controller to be proposed is a new hybrid semi-active control strategy based on the conventional Rakheja-Sankar (R-S) semi-active control to provide better ride-handling quality for vehicle suspension systems as well as industrial vibration isolators. To demonstrate the effectiveness of this new strategy, the analytical method of averaging and the numerical analysis method are deployed. In addition, a one-degree-of-freedom test bed equipped with a semi-active magnetorheological (MR) damper is developed. The tests are performed using the MATLAB XPC-target to guarantee the real-time implementation of the control algorithm. The second controller is an intelligent fuzzy logic controller system to optimize the suspension performance. The results from this intelligent system are compared with those of several renowned suspension control methods such as Skyhook. It is shown that the proposed controller can enhance concurrently the vehicle handling and ride comfort, while consuming less energy than existing control methodologies. The key goal of this thesis is to employ the existing knowledge of the semi-active systems together with the new ideas to develop a semi-active suspension system. At the same time, development of an experimental simulation system for real-time control of an experimental test bed is considered. To achieve its goals and objectives, this research study combines and utilizes the numerical simulations and analytical methods, as well as lab-based experimental works. The challenge in this research study is to identify practical and industrial problems and develop proper solutions to those problems using viable scientific approaches.

Book Annual Index abstracts of SAE Technical Papers

Download or read book Annual Index abstracts of SAE Technical Papers written by and published by . This book was released on 2006 with total page 1000 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book International Conference on Mechanics and Materials Engineering ICMME 2014

Download or read book International Conference on Mechanics and Materials Engineering ICMME 2014 written by and published by DEStech Publications, Inc. This book was released on 2014-06-18 with total page 776 pages. Available in PDF, EPUB and Kindle. Book excerpt: The conference aims to provide an excellent international academic forum for all the researchers, practitioner, students and teachers in related fields to share their knowledge and results in theory, methodology and application on mechanics and materials engineering. ICMME2014 features unique mixed topics of Mechanics, Materials Science and Materials Processing Technology, Emerging materials and other related ones. The ICMME2014 proceeding tends to collect the most up-to-date, comprehensive, and worldwide state-of-art knowledge on mechanics and materials engineering. All the accepted papers have been submitted to strict peer-review by 2–4 expert referees, and selected based on originality, significance and clarity for the purpose of the conference. The conference program is extremely rich, profound and featuring high-impact presentations of selected papers and additional late-breaking contributions. We sincerely hope that the conference would not only show the participants a broad overview of the latest research results on related fields, but also provide them a significant platform for academic connection and exchange.