Independent modal control for nonlinear flexible structures: An experimental test rig

Resta, Ferruccio; Ripamonti, Francesco; Cazzulani, Gabriele; Ferrari, M.

doi:10.1016/j.jsv.2009.10.021

Cited by 60 publications

(42 citation statements)

References 12 publications

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“…Vibrations suppression, feedforward and feedback actions, disturbance estimator, and modal control were researched. Modal space control method is used to reduce the tip vibration and trajectory control [23][24][25][26][27][28]. Lenord et al studied a flexible hydraulic mobile concrete pump truck.…”

Section: Introductionmentioning

confidence: 99%

Modeling and Analysis of Truck Mounted Concrete Pump Boom by Virtual Prototyping

Ren

et al. 2017

Journal of Robotics

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By far there is lack of research on different working conditions between rigid and flexible dynamics of truck mounted concrete pump booms. First a 3D model has been established by using virtual prototyping technology of a 37 m long boom in Pro/Engineering software. Then the rigid body simulation model has been built. Next modal superimposition method is adopted to change the 4 rigid body booms into flexible ones. Kinematics law and dynamic characteristics of 4 common working conditions had been studied then. Next tip displacement and the first boom hydraulic cylinder force of the 4 working conditions between rigid and flexible models have been researched. Furthermore the first natural frequencies of the structure have been calculated. The results show that the frequency of the horizontal condition has the lowest of all and the roof condition has the largest of all. Besides the cylinder forces of the flexible model are larger than the corresponding rigid ones because of the flexible boom vibration. Finally an experiment has been done on a boom test rig which proved that the established simulation model is reasonable and the frequency results are correct. All of these provide design reference to mechanical manipulator as well as reducing product development cost of such mechanism.

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Section: Introductionmentioning

confidence: 99%

Modeling and Analysis of Truck Mounted Concrete Pump Boom by Virtual Prototyping

Ren

et al. 2017

Journal of Robotics

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“…Model-based controllers, on the other hand, have been extensively investigated and implemented in other sectors, for example, in the mechanical engineering and aerospace industries, control of large space structures, as well as in studies with piezoelectric or piezo-ceramic materials (Houlston et al, 2007;Fang et al, 2003;Resta et al, 2010;Daley et al, 2004;Singh et al, 2003, Bosse et al, 2000. A group of model-based controllers of interest to this research work is observer-based compensators and independent modal space control (IMSC) approaches.…”

Section: Introductionmentioning

confidence: 99%

“…Some challenges concerning design freedoms that guarantee both overall closed-loop stability and controller stabilities with these approaches have been addressed in some research works (Liu et al, 1998;Liu et al, 2000). The IMSC approach has been successfully implemented in applications, for example, in the marine sector for developing isolation systems that improve the crew and passenger comfort (Daley et al, 2004) as well as in suppression of vibrations in a multi-body nonlinear flexible boom test rig (Resta et al, 2010). These control schemes can be designed for either global control (control of a wide bandwidth of frequencies) or they can be tailored for selective control (focusing control energy on selected resonance frequencies).…”

Section: Introductionmentioning

confidence: 99%

Comparative studies of global and targeted control of walkway bridge resonant frequencies

Nyawako

Reynolds

2016

Journal of Vibration and Control

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In this paper, three controllers are investigated for active vibration control (AVC) of a pedestrian walkway structure. They comprise of direct velocity feedback (DVF), observer-based and independent modal space (IMSC) controllers that are implemented in single-input single-output (SISO), multi-SISO and multiple-input multiple-output (MIMO) configurations. The objective of the SISO controller schemes is to compare vibration mitigation performances arising from global control versus selective control of structural resonant frequencies in a given frequency bandwidth. The objectives set out for the multi-SISO and MIMO controllers are to realise global control within the same frequency bandwidth considered in the SISO studies. A novel aspect of these latter studies is the independent control of selected resonant frequencies at different locations on the structure with the aim of imposing global control.Vibration mitigation performances are evaluated using frequency response function measurements and uncontrolled and controlled responses to a synthesized walking excitation force. In the SISO studies, selective control of specific resonant frequencies has a slight degradation in the global vibration mitigation performance although it reflects better performance around the target frequencies. For the multi-SISO and MIMO controller studies, the selective control of the two lowest and dominant frequencies of the structure at two different locations still offers comparative vibration mitigation performances with the controllers considered as global in the sense that they target both structural frequencies at both locations. Attenuations of between 10-35 dB are achieved.

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“…Moreover, when designers have to deal with lightweight components, generally characterized by low damping on a wide range of frequencies, or with low frequency vibration control, the introduction of structural damping is not feasible and AVC becomes a very accurate approach. Among the others the model-based solutions, such as optimal control 1 or modal control, [2][3][4][5][6] allow to reach very high performance in the vibration suppression. However for non-linear and time-varying systems, an attractive solution is represented by the use of adaptive feedback controls able to modify in real time the control law gains to follow the system parameters change.…”

Section: Introductionmentioning

confidence: 99%

An adaptive non-model-based control strategy for smart structures vibration suppression

et al. 2013

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The vibration reduction in mechanical systems can be performed by means of active control strategies. For non-linear and time-varying systems, a suitable choice is the use of an adaptive feedback solution, in which the identification system is a fundamental part of the control scheme. In this work, a non-model-based identification system is proposed and its results are used to automatically set the gain of the Direct Velocity Feedback (DVF) control law. The proposed adaptive control algorithm has been tested on a smart structure represented by a carbon fibre plate instrumented with strain gauge, accelerometers and piezoelectric patches. © 2013 SPIE

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Independent modal control for nonlinear flexible structures: An experimental test rig

Cited by 60 publications

References 12 publications

Modeling and Analysis of Truck Mounted Concrete Pump Boom by Virtual Prototyping

Modeling and Analysis of Truck Mounted Concrete Pump Boom by Virtual Prototyping

Comparative studies of global and targeted control of walkway bridge resonant frequencies

An adaptive non-model-based control strategy for smart structures vibration suppression

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