Modeling the Bifilar Pendulum Using Nonlinear, Flexible Multibody Dynamics

Bauchau, Olivier A.; Rodriguez, Jesus; Chen, Shyi-Yaung

doi:10.4050/jahs.48.53

Cited by 22 publications

(9 citation statements)

References 21 publications

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“…These are calculated from Eq. (15). Each natural frequency shown in Table 2 corresponds to a pair of complex conjugate eigenvalues.…”

Section: Numerical Examplesmentioning

confidence: 99%

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Modal properties and stability of centrifugal pendulum vibration absorber systems with equally spaced, identical absorbers

Shi

Parker

2012

Journal of Sound and Vibration

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“…These are calculated from Eq. (15). Each natural frequency shown in Table 2 corresponds to a pair of complex conjugate eigenvalues.…”

Section: Numerical Examplesmentioning

confidence: 99%

“…Cronin did not determine the natural frequencies or modal properties. Bauchau et al [15] showed significant reduction in hub translational displacement for the Sikorsky UH-60 helicopter rotor by applying CPVAs.…”

mentioning

confidence: 98%

Modal properties and stability of centrifugal pendulum vibration absorber systems with equally spaced, identical absorbers

Shi

Parker

2012

Journal of Sound and Vibration

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“…From previously derived pendulum equations (4)- (6), expression for the moment of inertia in terms of oscillation period (or frequency) [3][4][5][6][7][8] can be obtained as: …”

Section: Inertia Estimatormentioning

confidence: 99%

“…For more complex bodies such as the UAVs, equations tend to get more complex, which makes the calculation of inertia quite impractical, so it would be more convenient to estimate it from dynamical tests. Various approaches in [3][4][5][6][7] introduce identification of inertia based on measurements of the oscillation period of a bifilar pendulum. Although all these methods enable very precise results, they are based on offline analysis of measured data.…”

Section: Introductionmentioning

confidence: 99%

On-line Inertia Measurement of Unmanned Aerial Vehicles using on board Sensors and Bifilar Pendulum

Krznar¹,

Kotarski²,

Piljek³

et al. 2018

Interdiscip. Descr. Complex Syst.

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Identification of a dynamical model and its parameters is one of the fundamental problems in the field of robotics and system dynamics modelling. For the general situation of an object motion with six degrees of freedom (6-DOF), such as in the case of the Unmanned Aerial Vehicle (UAV), the key physical parameters are vehicle mass and moment of inertia. Even though UAV mass and its geometry/topology are easily obtainable, it is difficult to identify the inertia tensor considering that it is not measurable by static tests. This article presents a simple and effective method for on-line estimation of a rigid-body inertia based on a two-wire pendulum and an on-board integrated sensor system. Herein, the test subject (i.e. UAV) is suspended by two thin parallel wires in such a way to form a bifilar torsional pendulum about the vertical axis. Using on-board sensors from the UAV flight controller (FC) unit, the pendulum oscillations are recorded and processed in order to obtain trendfree and noise-free signals used in the final inertia estimation phase. The proposed identification algorithm is verified experimentally for two typical cases of suspended objects related to the UAV control box and a full UAV configuration.

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“…The device has been successfully applied in fields including rail transportation [1], aviation [2], and aerospace [3] and structural [4] engineering. Compared with general passive TMDs, active TMDs (ATMDs) offer advantages such as small mass, good control, and broader potential in applications.…”

Section: Introductionmentioning

confidence: 99%

Force Feedback Control Method of Active Tuned Mass Damper

Wang¹,

Yun²

2017

Shock and Vibration

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Active tuned mass dampers as vibration-control devices are widely used in many fields for their good stability and effectiveness. To improve the performance of such dampers, a control method based on force feedback is proposed. The method offers several advantages such as high-precision control and low-performance requirements for the actuator, as well as not needing additional compensators. The force feedback control strategy was designed based on direct-velocity feedback. The effectiveness of the method was verified in a single-degree-of-freedom system, and factors such as damping effect, required active force, actuator stroke, and power consumption of the damper were analyzed. Finally, a simulation study was performed by configuring a main complex elasticvibration-damping system. The results show that the method provides effective control over modal resonances of multiple orders of the system and improves its dynamics performance.

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Modeling the Bifilar Pendulum Using Nonlinear, Flexible Multibody Dynamics

Cited by 22 publications

References 21 publications

Modal properties and stability of centrifugal pendulum vibration absorber systems with equally spaced, identical absorbers

Modal properties and stability of centrifugal pendulum vibration absorber systems with equally spaced, identical absorbers

On-line Inertia Measurement of Unmanned Aerial Vehicles using on board Sensors and Bifilar Pendulum

Force Feedback Control Method of Active Tuned Mass Damper

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