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Abstract

The topic of smart structures, their active control and implementation, is relatively new. Therefore, different approaches to the problem can be met. The present paper discusses variable aspects of the active control of structures. It explains the idea of smart systems, introduces different terms used in smart technique and defines the structural smartness. The author indicates differences between actively controlled structures and structural health monitoring systems and shows an example of an actively controlled smart footbridge. The analyses presented in the study concern tensegrity structures, which are prone to the structural control through self-stress state adjustment. The paper introduces examples of structural control performed on tensegrity modules and plates. An influence of several self-stress states on displacements is analyzed and a study concerning damage due to member loss is presented.

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Authors and Affiliations

A. Al Sabouni-Zawadzka
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Abstract

Turbulent boundary layer separation induced by positive pressure gradient at a plane surface is investigated experimentally. Separation is delayed by means of a jet vortex generator in a form of small jets injected to the boundary layer through orifices distributed across the main flow. The effect of jets intensity on delay of separation is examined. Swirled and non-swirled jets have been used. The energy of the air supplying the generator required to delay boundary layer separation is in the former case up to 40% lower than in the latter one.
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Authors and Affiliations

Andrzej Szumowski
Jan Wojciechowski
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Abstract

Considering the importance of gear systems as one of the important vibration and noise sources in power transmission systems, an active control for suppressing gear vibration is presented in this paper. A gear bearing model is developed and used to design an active control gear-bearing system. Two possible configurations of control system are designed based on active bearing and active gear-shaft torsional coupling to control and reduce the disturbance affecting system components. The controller for computing the actuation force is designed by using the H-infinity control approach. Simulation results indicate that the desired controller can efficiently be used for vibration control of gear bearing systems.
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Bibliography

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[2] T.J. Sutton, S.J. Elliott, M.J. Brennan, K.H. Heron and D.A.C. Jessop. Active isolation of multiple structural waves on a helicopter gearbox support strut. Journal of Sound and Vibration, 205(1):81–101, 1997. doi: 10.1006/jsvi.1997.0972.
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[5] M.H. Chen and M.J. Brennan. Active control of gear vibration using specially configured sensors and actuators. Smart Materials and Structures, 9:342–350, 2000. doi: 10.1088/0964-1726/9/3/315.
[6] M. Li, T.C. Lim, and W.S. Shepard Jr. Modeling active vibration control of a geared rotor system. Smart Materials and Structures, 13:449–458, 2004. doi: 10.1088/0964-1726/13/3/001.
[7] Y.H. Guan, T.C. Lim, and W.S. Shepard Jr. Experimental study on active vibration control of a gearbox system. Journal of Sound and Vibration, 282(3-5):713–733, 2005. doi: 10.1016/j.jsv.2004.03.043.
[8] Y.H. Guan, M. Li, T.C. Lim, and W.S. Shepard Jr. Comparative analysis of actuator concept for active gear pair vibration control. Journal of Sound and Vibration, 269(1-2):273–294, 2004. doi: 10.1016/S0022-460X(03)00072-5.
[9] Y. Li, F. Zhang, Q. Ding, and L. Wang. Method and experiment study for active vibration control of gear meshing. Zhendong Gongcheng Xuebao/Journal of Vibration Engineering, 27(2):215–221, 2014.
[10] W. Gao, L. Wang, and Y. Liu. A modified adaptive filtering algorithm with online secondary path identification used for suppressing gearbox vibration. Journal of Mechanical Science and Technology, 30(11):4833–4843, 2016. doi: 10.1007/s12206-016-1002-z.
[11] W. Sun, F. Zhang, H. Li, H. Wang, and S. Luo. Co-simulation study on vibration control of multistage gear transmission system based on multiple control algorithms. Proceedings of the 2017 International Conference on Advanced Mechatronic Systems, pages 1–7, Xiamen, China, 2017. doi: 10.1109/ICAMechS.2017.8316474.
[12] W. Sun, F. Zhang, W. Zhu, H. Wang, S. Luo, and H. Li. A comparative study based on different control algoritms for suppressing multistage gear transmission system vibrations. Shock and Vibration, 2018:ID7984283, 2018. doi: 10.1155/2018/7984283.
[13] H. Wang, F. Zhang, H. Li, W. Sun, and S. Luo. Experimental analysis of an active vibration frequency control in gearbox. Shock and Vibration, 2018:ID7984283, 2018. doi: 10.1155/2018/1402697.
[14] C. Lauwerys, J. Swevers, and P. Sas. Robust linear control of an active suspension on a quarter car test-rig. Control Engineering Practice, 13(5):577–586, 2005. doi: 10.1016/ j.conengprac.2004.04.018.
[15] W. Sun, J. Li, Y. Zhao, and H. Gao. Vibration control for active seat suspension systems via dynamic output feedback with limited frequency characteristic. Mechatronics, 21(1):250–260, 2011. doi: 10.1016/j.mechatronics.2010.11.001.
[16] A. Farshidianfar, A. Saghafi, S.M. Kalami, and I. Saghafi. Active vibration isolation of machinery and sensitive equipment using H∞ control criterion and particle swarm optimization method. Meccanica, 47:437–453, 2012. doi: 10.1007/s11012-011-9451-z.
[17] R. Eberhart and J. Kennedy. A new optimizer using particle swarm theory. In Proceedings of the Sixth International Symposium on Micro Machine and Human Science, Nagoya, Japan, 4-6 October, 1995. doi: doi.org/10.1109/MHS.1995.494215">10.1109/MHS.1995.494215.
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[20] A. Saghafi, A. Farshidianfar, and A.A. Akbari. Vibrations control of gear-bearing dynamic system. Modares Mechanical Engineering, 14(6):135-143, 2014. (in Persian).
[21] A. Farshidianfar and A. Saghafi. Global bifurcation and chaos analysis in nonlinear vibration of spur gear systems. Nonlinear Dynamics, 75:783–806, 2014. doi: 10.1007/s11071-013-1104-4.
[22] A. Saghafi and A. Farshidianfar. An analytical study of controlling chaotic dynamics in a spur gear system. Mechanism and Machine Theory, 96(1):179–191, 2016. doi: 10.1016/j.mechmachtheory.2015.10.002.
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Authors and Affiliations

Amin Saghafi
1
ORCID: ORCID
Anooshirvan Farshidianfar
2

  1. Department of Mechanical Engineering, Birjand University of Technology, Birjand, Iran
  2. Department of Mechanical Engineering, Ferdowsi University of Mashhad, Mashhad, Iran
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Abstract

For successful active control with a vibrating plate it is essential to appropriately place actuators. One of the most important criteria is to make the system controllable, so any control objectives can be achieved. In this paper the controllability-oriented placement of actuators is undertaken. First, a theoretical model of a fully clamped rectangular plate is obtained. Optimization criterion based on maximization of controllability of the system is developed. The memetic algorithm is used to find the optimal solution. Obtained results are compared with those obtained by the evolutionary algorithm. The configuration is also validated experimentally.
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Authors and Affiliations

Stanisław Wrona
Marek Pawełczyk
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Abstract

It is possible to enhance acoustic isolation of the device from the environment by appropriately controlling vibration of a device casing. Sound insulation efficiency of this technique for a rigid casing was confirmed by the authors in previous publications. In this paper, a light-weight casing is investigated, where vibrational couplings between walls are much greater due to lack of a rigid frame. A laboratory setup is described in details. The influence of the cross-paths on successful global noise reduction is considered. Multiple vibration actuators are installed on each of the casing walls. An adaptive control strategy based on the Least Mean Square (LMS) algorithm is used to update control filter parameters. Obtained results are reported, discussed, and conclusions for future research are drawn.

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Authors and Affiliations

Stanisław Wrona
Marek Pawelczyk
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Abstract

In mid-1992, Japanese consultant Yamada Hitoshi was tasked with modifying the production systems of Japanese companies as the existing configurations at manufacturing plants no longer satisfied unstable demands. He made improvements to the overall production system by dividing the long assembly lines into several short ones called cells or seru. Although of the advantages, it is still unclear about how to manage this new production system, and what variables really promoted the desired benefits. We identify in total 39 articles from 2004– 2020 about the progress of the seru production system, and we observe some possibilities to improve the effectiveness of this type of the production system. The first is the possibility of manufacturing the product in flexible sequence, in which the operations are independent among them. We show through the developed example that the makespan may be different. We noted when converting the in-line production system to one pure seru, the makespan tend to increase. Nevertheless, when analyzing the effectiveness of serus working concomitantly considering splitting the same lot, makespan and the cost may be reduced. And finally, when converting to one of pure serus, the performance may be similar to that obtained when serus working concomitantly.
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Authors and Affiliations

Yung Chin Shih

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