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Absolute Acceleration
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R S Jangid – One of the best experts on this subject based on the ideXlab platform.

optimum viscous damper for connecting adjacent sdof structures for harmonic and stationary white noise random excitations
Earthquake Engineering & Structural Dynamics, 2007CoAuthors: A V Bhaskararao, R S JangidAbstract:The dynamic behaviour of two adjacent singledegreeoffreedom (SDOF) structures connected with a viscous damper is studied under base Acceleration. The base Acceleration is modelled as harmonic excitation as well as stationary whitenoise random process. The governing equations of motion of the connected system are derived and’solved for relative displacement and Absolute Acceleration responses of connected structures. The response of structures is found to be reduced by connecting with a viscous damper having appropriate damping. For undamped SDOF structures, the closedform expressions for optimum damping of viscous damper for minimum steady state as well as minimum mean square relative displacement and Absolute Acceleration of either of the connected SDOF structures are derived. The optimum damper damping is found to be functions of mass and frequency ratio of two connected structures. Further, numerical results had indicated that the damping of the connected structures does not have noticeable effects on the optimum damper damping and the corresponding optimized response. This implies that the derived closedform expressions for optimum damper damping of undamped structures can also be used in practical applications for damped structures.

Optimum viscous damper for connecting adjacent SDOF structures for harmonic and stationary white‐noise random excitations
Earthquake Engineering & Structural Dynamics, 2007CoAuthors: A V Bhaskararao, R S JangidAbstract:The dynamic behaviour of two adjacent singledegreeoffreedom (SDOF) structures connected with a viscous damper is studied under base Acceleration. The base Acceleration is modelled as harmonic excitation as well as stationary whitenoise random process. The governing equations of motion of the connected system are derived and’solved for relative displacement and Absolute Acceleration responses of connected structures. The response of structures is found to be reduced by connecting with a viscous damper having appropriate damping. For undamped SDOF structures, the closedform expressions for optimum damping of viscous damper for minimum steady state as well as minimum mean square relative displacement and Absolute Acceleration of either of the connected SDOF structures are derived. The optimum damper damping is found to be functions of mass and frequency ratio of two connected structures. Further, numerical results had indicated that the damping of the connected structures does not have noticeable effects on the optimum damper damping and the corresponding optimized response. This implies that the derived closedform expressions for optimum damper damping of undamped structures can also be used in practical applications for damped structures.

Optimum friction pendulum system for nearfault motions
Engineering Structures, 2005CoAuthors: R S JangidAbstract:The analytical seismic response of multistory buildings isolated by the friction pendulum system (FPS) is investigated under nearfault motions. The superstructure is idealized as a linear shear type flexible building. The governing equations of motion of the isolated structural system are derived and the response of the system to the normal component of six recorded nearfault motions is evaluated by the stepbystep method. The variation of top floor Absolute Acceleration and sliding displacement of the isolated building is plotted under different system parameters such as superstructure flexibility, isolation period and friction coefficient of the FPS. The comparison of results indicated that for low values of friction coefficient there is significant sliding displacement in the FPS under nearfault motions. In addition, there also exists a particular value of the friction coefficient of FPS for which the top floor Absolute Acceleration of the building attains the minimum value. Further, the optimum friction coefficient of the FPS is derived for different system parameters under nearfault motions. The criterion selected for optimality is the minimization of both the top floor Acceleration and the sliding displacement. The optimum friction coefficient of the FPS is found to be in the range of 0.05 to 0.15 under nearfault motions. In addition, the response of a bridge seismically isolated by the FPS is also investigated and it is found that there exists a particular value of the friction coefficient for which the pier base shear and deck Acceleration attain the minimum value under nearfault motions.
A V Bhaskararao – One of the best experts on this subject based on the ideXlab platform.

optimum viscous damper for connecting adjacent sdof structures for harmonic and stationary white noise random excitations
Earthquake Engineering & Structural Dynamics, 2007CoAuthors: A V Bhaskararao, R S JangidAbstract:The dynamic behaviour of two adjacent singledegreeoffreedom (SDOF) structures connected with a viscous damper is studied under base Acceleration. The base Acceleration is modelled as harmonic excitation as well as stationary whitenoise random process. The governing equations of motion of the connected system are derived and’solved for relative displacement and Absolute Acceleration responses of connected structures. The response of structures is found to be reduced by connecting with a viscous damper having appropriate damping. For undamped SDOF structures, the closedform expressions for optimum damping of viscous damper for minimum steady state as well as minimum mean square relative displacement and Absolute Acceleration of either of the connected SDOF structures are derived. The optimum damper damping is found to be functions of mass and frequency ratio of two connected structures. Further, numerical results had indicated that the damping of the connected structures does not have noticeable effects on the optimum damper damping and the corresponding optimized response. This implies that the derived closedform expressions for optimum damper damping of undamped structures can also be used in practical applications for damped structures.

Optimum viscous damper for connecting adjacent SDOF structures for harmonic and stationary white‐noise random excitations
Earthquake Engineering & Structural Dynamics, 2007CoAuthors: A V Bhaskararao, R S JangidAbstract:The dynamic behaviour of two adjacent singledegreeoffreedom (SDOF) structures connected with a viscous damper is studied under base Acceleration. The base Acceleration is modelled as harmonic excitation as well as stationary whitenoise random process. The governing equations of motion of the connected system are derived and’solved for relative displacement and Absolute Acceleration responses of connected structures. The response of structures is found to be reduced by connecting with a viscous damper having appropriate damping. For undamped SDOF structures, the closedform expressions for optimum damping of viscous damper for minimum steady state as well as minimum mean square relative displacement and Absolute Acceleration of either of the connected SDOF structures are derived. The optimum damper damping is found to be functions of mass and frequency ratio of two connected structures. Further, numerical results had indicated that the damping of the connected structures does not have noticeable effects on the optimum damper damping and the corresponding optimized response. This implies that the derived closedform expressions for optimum damper damping of undamped structures can also be used in practical applications for damped structures.
Tao Peng – One of the best experts on this subject based on the ideXlab platform.

primary resonance analysis and vibration suppression for the harmonically excited nonlinear suspension system using a pair of symmetric viscoelastic buffers
Nonlinear Dynamics, 2018CoAuthors: Hong Zhang, Wenjun Meng, Ronghui Zhang, Kening Li, Tao PengAbstract:To reduce the severity of highmagnitude vibrations and shock, endstop buffers was used for the most suspension cabs or seats of work vehicles. This paper employs a pair of symmetric linear viscoelastic endstops to improve the performance of a singledegreeoffreedom nonlinear suspension system under primary resonance conditions, which has cubic nonlinearity. Firstly, a piecewise symmetry trinonlinear model is introduced. The frequency response of relative displacement corresponding to the steadystate motion is obtained by applying the multiplescale method, which is found to be the same with the averaging method solution. And it is further verified by numerical simulation. Its stability is then studied. Subsequently, a design criterion is proposed for jump avoidance, which is caused by the saddlenode bifurcation. Also, parametric studies are carried out to illustrate effects of design parameters for the endstop on the isolation performance at primary resonance, including responses of the relative displacement and the Absolute Acceleration. The results show that with dynamic parameters properly designed by using viscoelastic endstops, the relative displacement response can be effectively suppressed and the jump can be eliminated for both hardening and softening primary isolators. Besides, the endstop can effectively attenuate the Absolute Acceleration response for a hardening primary isolator, while more damping is needed to attenuate that for a softening primary isolator, although the degree of the softening nonlinearity is mitigated. It is suggested that a moderate stiffness compared to that of the primary isolator and also a high damping of the endstop be beneficial to both vibration isolation and jump avoidance under primary resonance conditions.