Inerter with Continuously Variable Transmission for Tuned Mass Damper Application (original) (raw)
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The protection of civil structures, including their material contents and human occupants, is without doubt a world-wide priority of most serious current research. Such protection may range from reliable operation and comfort, on one hand, to serviceability on the other. Examples of such structures which leap to one's mind include buildings, towers, and bridges. In like manner, events which cause the need for such protective measures are environmental like earthquakes and winds, or moving loads like cars and pedestrians in the case of bridges. The earthquake hazard is translated in severe vibrations for the structural systems. In order to handle this world wide problem auxiliary damping devices is added to absorb those vibrations. One of the early used damping devices is the Tuned Mass Damper (TMD) which is a passive system in that it absorbs the structural response without adding an external control signal. In this work a case study of three stories building model excited by a simulated earthquake hazard is investigated versus the response of the same building supplied by a TMD.
Novel type of tuned mass damper with inerter which enables changes of inertance
Journal of Sound and Vibration, 2015
In this paper we propose the novel type of tuned mass damper and investigate its properties. Characteristic feature of the device is that it contains a special type of inerter equipped with a continuously variable transmission and gear-ratio control system which enables stepless and accurate changes of inertance. We examine the damping properties of the proposed tuned mass damper with respect to one-degree-of-freedom harmonically forced oscillator. To prove the potential of introduced device we test its four different embodiments characterized by four different sets of parameters. We generalize our investigation and show that proposed device has broad spectrum of applications, we consider three different stiffness characteristics of damped structure i.e. linear, softening and hardening. We use the frequency response curves to present how considered devices influence the dynamics of analyzed systems and demonstrate their capabilities. Moreover, we check how small perturbations introduced to the system by parametric and additive noise influence system's dynamics. Numerical results show excellent level of vibration reduction in an extremely wide range of forcing frequencies.
Review Paper on “Tuned Mass Damper”
Journal of Advances and Scholarly Researches in Allied Education
Now a days, structures are continuously increasing in the construction industries which are having a very low damping value. The structures can easily fail under structural vibrations induced by earthquake and wind, some several techniques are available today to control the vibration of the structure, TMD is one of these techniques are use today. Some investigations are carried out to identify the importance and performance of tuned mass damper in different structures. In this thesis, a one-storey and a two-storey building frame models are developed for shake table experiment under sinusoidal excitation to observe the response of the structure with and without TMD. The TMD is tuned to the structural frequency of the structure keeping the stiffness and damping constant. Various parameters such as frequency ratio, mass ratio, tuning ratio etc. are considered to observe the effectiveness and robustness of the TMD in terms of percentage reduction in amplitude of the structure. Then the responses obtained are validated numerically using finite element method. From the study it is observed that, TMD can be effectively used for vibration control of structures.
Experimental study of the novel tuned mass damper with inerter which enables changes of inertance
Journal of Sound and Vibration, 2017
In this paper we present the experimental verification of the novel tuned mass damper which enables changes of inertance. Characteristic feature of the proposed device is the presence of special type of inerter. This inerter incorporates a continuously variable transmission that enables stepless changes of inertance. Thus, it enables to adjust the parameters of the damping device to the current forcing characteristic. In the paper we present and describe the experimental rig that consists of the massive main oscillator forced kinematically and the prototype of the investigated damper. We perform a series of dedicated experiments to characterize the device and asses its damping efficiency. Moreover, we perform numerical simulations using the simple mathematical model of investigated system. Comparing the numerical results and the experimental data we legitimize the model and demonstrate the capabilities of the investigated tuned mass damper. Presented results prove that the concept of the novel type of tuned mass damper can be realized and enable to confirm its main advantages. Investigated prototype device offers excellent damping efficiency in a wide range of forcing frequencies.
IJERT-Design and Analysis of Tune Mass Damper System
International Journal of Engineering Research and Technology (IJERT), 2020
https://www.ijert.org/design-and-analysis-of-tune-mass-damper-system https://www.ijert.org/research/design-and-analysis-of-tune-mass-damper-system-IJERTV9IS100244.pdf Vibrations are one of the major environmental factors that act on buildings and mechanical structures, potentially reducing their lifetime. Current trends in construction industry demand taller and lighter structures with more flexibility, yet they have a quite low damping value. This increases failure possibilities and also create problems from serviceability point of view. Many building structure and bridges fall because of vibration, if frequency of excitation coincide with one of the natural frequency of system. Now-a-days several techniques are available to minimize vibrations of a structure. Out of these, concept of using tuned mass damper is a recent trending innovation. This study is conducted to research the effectiveness of using tuned mass damper for controlling vibration of a structure. The report proposes a comparative analysis of passive vibration control system with un-damped system, on single degree of freedom structural frames subjected to external excitation. A combined unit of an accelerometer and an Arduino Uno R2 aids in measurement of vibrations and processes it in the form of acceleration vs. time graph, the preliminary results of which help us reach a conclusion. A working model was practically designed and manufactured to carry out the experiment for studying the TMD.
Influence of Variable Damping Coefficient on Efficiency of TMD with Inerter
Energies, 2020
In this paper, we study the dynamics of a two-degree freedom system consisting of the main body and tuned mass damper with inerter (TMDI). We add the dash-pot with variable damping coefficient to TMDI to study the overall efficiency of the device. We investigate different types of the non-linear characteristic of the dash-pot. We investigate devices in which damping coefficient change according to the relative displacement or the relative velocity between the damped mass and tuned mass damper. We also include in the investigation of different types of control functions. We show the two-parameter diagrams presenting the main body’s maximum amplitude versus the frequency of excitation of the damped body and different control parameter. We show how the application of a non-linear damper lets us control the main system’s oscillation amplitude.
Performance of Numerically Optimized Tuned Mass Damper with Inerter (TMDI)
Applied Sciences
In recent years, the Tuned Mass Damper with inerter (TMDI) has received significant attention. The inerter is defined to exert a force that is in proportion to the relative acceleration of the two inerter terminals. Here, two TMDI topologies are investigated. The conventional topology is given by the inerter being in parallel to the spring and viscous damper of the TMDI. The other topology is the serial arrangement of spring, inerter and viscous damper being in parallel to the stiffness of the mass spring oscillator of the TMDI. While the first topology intends to increase the inertial force of the TMDI, the second topology aims at producing an additional degree of freedom. The considered TMDI concepts are simulated for harmonic and random excitations, with parameters set according to those described in the literature and with numerically optimized parameters which minimize the primary structure displacement response. The classical TMD is used as a benchmark. The findings are twofol...
Mechanism and Machine Theory, 2018
In this paper we show the design of a novel tuned mass damper with inerter that enables changes of inertance. We present the details of the experimental rig that is used to test the prototype device and provide technical documentation of its crucial elements. The mathematical model of the system is derived based on the Lagrange equations of the second type. We identify the parameters of the system: masses, stinesses of springs and damping coecients. We pay special attention to identication of energy dissipation model composed of viscous damping and Coulomb damping. We use two step procedure to nd the proper values of damping coecients with high precision. To validate the model we compare the numerical and experimental time traces. Good matching of the results prove well-posedness of the model and conrm the obtained parameter values.
Archive of Applied Mechanics, 2019
The tuned mass damper (TMD) is a widely used passive control device which is attached to a main system to suppress undesired vibration. In this paper, a non-traditional form of TMD system is investigated. Unlike the traditional TMD configuration, the considered TMD system has a linear viscous damper connecting the absorber mass directly to the ground instead of the main mass. There have been some studies on the optimization design of the non-traditional TMD (NT-TMD) for undamped main structures. Those studies have indicated that the NT-TMD provides better performance than the traditional TMD does. When there is a frequency shifting in the structural frequency or tuning frequency of TMD, to the best knowledge of the authors, there has been no study on the performance of the NT-TMD. The main idea of the study is to investigate the effect of frequency detuning on the control performance of the NT-TMD. The optimum parameters of the NT-TMD system and corresponding effectiveness are obtained for different mass ratios of the NT-TMD system. The numerical results indicate that the NT-TMD with high mass ratio provides better robustness to the changes in the target frequency ratio than the traditional TMD.