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Introduction to Benchmark Control Problems
Published in Suhasini Madhekar, Vasant Matsagar, Passive Vibration Control of Structures, 2022
Suhasini Madhekar, Vasant Matsagar
Patil and Jangid (2010) proposed and investigated a modified FD to attain enhanced performance when installed to the benchmark building. An additional plate is provided between the two sliding plates of a conventional FD, which results in an additional sliding interface with the same clamping force. Optimization of location and number of dampers are also carried out with the help of a controllability index which is obtained with the help of RMS value of the inter-story drift. Further, a parametric study of FDs is carried out by varying the slip force. At optimized locations, the proposed dampers give significant enhancement in the performance.
Magnetizable Fluids
Published in Leslie R. Rudnick, Synthetics, Mineral Oils, and Bio-Based Lubricants, 2020
Tom Black, J. David Carlson, Daniel E. Barber
Automotive applications continue to be a primary driver of the development of MR technology. In addition, LORD Corporation has been developing heavy-duty dampers for off-road and military vehicle applications [33]. Such dampers have been shown to provide improved handling and control at higher speeds while reducing the amount of energy transmitted to the vehicle and passengers, with MR damper durability well in excess of test requirements [29].
Suspension Elements and Their Characteristics
Published in Simon Iwnicki, Maksym Spiryagin, Colin Cole, Tim McSweeney, Handbook of Railway Vehicle Dynamics, 2019
Sebastian Stichel, Anna Orlova, Mats Berg, Jordi Viñolas
Damping is usually provided in railway vehicle suspension by the use of viscous or friction damping devices. A damper is the device that controls oscillations in the primary or secondary suspension of the vehicle by energy dissipation.
Application and Innovation of High-Strength Concrete in High-Rise Building Structures
Published in Structural Engineering International, 2022
Cong-zhen Xiao, Jian-hui Li, Yin-bin Li, Yue Wei, Chao Sun
(2) Scheme B. In addition to setting vertical dampers on two strengthened layers, the middle 1/3 of the structure’s height was installed with herringbone brace type dampers. There were 8 vertical dampers and 160 dampers of herringbone brace type in total.(3) Scheme C. On the basis of Scheme B, the number of herringbone brace type dampers was optimized, only parts of the dampers were retained. There were 8 vertical dampers and 72 herringbone brace type dampers in total. The damper types include viscous dampers and friction dampers. The damper parameters were set as follows.(4) Nonlinear parameters are taken for viscous dampers: damping exponent α = 0.3, damping coefficient c = 10,000 kN·(s/m)0.3.(5) Initial stiffness of friction damper k1 = 4,000,000 kN/m, yield strength Fy= 4,000 kN, post-yield stiffness k2 = 4,000 kN/m.
Stochastic failure process of railway vehicle dampers and the effects on suspension and vehicle dynamics
Published in Vehicle System Dynamics, 2021
Y. C. Zeng, D. L. Song, W. H. Zhang, Z. Y. Hu, Z. C. Chang
As significant components on vehicles, dampers are widely applied to reduce vibration and improve dynamical performance. After long-term service, degradation and failure of damping characteristics occur, which is closely related to the deterioration of vehicle system dynamics. In the field of automobiles, Bedük et al. [1] analysed the transient effect of sudden damper failure on vehicle stability through simulations and mentioned the discrepancy of damping characteristics between two service mileages. Ko et al. [2] utilised a model of look-up table to analyse the effect of damping characteristics at different service mileages on vehicles. Guba et al. [3] and Gracia et al. [4] studied the effect of damper ageing on vehicle handling, in which the worn damper was modelled with a reduced damping coefficient. However, rare research studied the degradation and failure process of railway vehicle dampers and their effects on vehicle system dynamics.
Contributions of vehicle dynamics to the energy efficient operation of road and rail vehicles
Published in Vehicle System Dynamics, 2021
Jenny Jerrelind, Paul Allen, Patrick Gruber, Mats Berg, Lars Drugge
During excitation of a vehicle’s suspension, the damper is designed to reduce the transmitted excitation by dissipating kinetic energy in the form of heat. By harvesting this energy, the energy can then be used for other purposes and thereby improve overall energy efficiency. The recovered kinetic energy is converted to electricity (or other potential energy) and stored.