Dissipation of energy analysis approach for vehicle plane motion stability

2021 ◽

pp. 095440702110433

Author(s):

Shuming Shi ◽

Fanyu Meng ◽

Minghui Bai ◽

Nan Lin

Keyword(s):

Stability Analysis ◽

Quantitative Analysis ◽

Lyapunov Exponents ◽

Plane Motion ◽

Vehicle Model ◽

Motion Stability ◽

Motion System ◽

Nonlinear Vehicle Model ◽

The Stability ◽

Different Characteristics

The Lyapunov exponents method is an excellent approach for analyzing the vehicle plane motion stability, and the researchers demonstrated the effectiveness under 2-DOF vehicle model. However, whether the Lyapunov exponents approach can effectively reveal the characteristics of high-DOF nonlinear vehicle model is the key problem at present. In this paper, the Lyapunov exponents is applied to quantitatively analyze the stability of the nonlinear three and five degree of freedom vehicle plane motion system. The different characteristics between 2-DOF and high-DOF model are revealed and explained by using Lyapunov exponents. It illustrates the feasibility of using Lyapunov exponents to analyze the stability of high-DOF vehicle models, which supplements and perfects the existing quantitative analysis conclusion.

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Statistical Energy Analysis of Vibrating Systems

Journal of Engineering for Industry ◽

10.1115/1.3610123 ◽

1967 ◽

Vol 89 (4) ◽

pp. 626-632 ◽

Cited By ~ 8

Author(s):

Eric E. Ungar

Keyword(s):

Complex Systems ◽

Energy Analysis ◽

Energy Approach ◽

Analysis Approach ◽

Statistical Energy Analysis ◽

Random Vibrations ◽

Vibration Problems ◽

Energy Balances ◽

Vibrating Systems

The “statistical energy analysis” approach provides a relatively simple means for understanding and estimating the significant properties of multimodal random vibrations of complex systems, since this approach permits one to treat complex vibration problems in terms of much simpler energy balances. This paper delineates the concepts and relations which form the basis for the statistical energy approach, indicates its range of validity, and illustrates some of its applications.

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Study on the Motion Stability of the Autonomous Underwater Helicopter

Journal of Marine Science and Engineering ◽

10.3390/jmse10010060 ◽

2022 ◽

Vol 10 (1) ◽

pp. 60

Author(s):

Yuan Lin ◽

Jin Guo ◽

Haonan Li ◽

Hai Zhu ◽

Haocai Huang ◽

...

Keyword(s):

Autonomous Underwater Vehicle ◽

Angle Of Attack ◽

Vertical Movement ◽

Plane Motion ◽

Hydrodynamic Performance ◽

Scale Model ◽

Motion Stability ◽

Movement Stability ◽

Stability Indexes ◽

Drag Ratio

The hydrodynamic performance of a novel hovering autonomous underwater vehicle, the autonomous underwater helicopter (AUH), with an original disk-shaped hull (HG1) and an improved fore–aft asymmetric hull (HG3), is investigated by means of computational fluid dynamics with the adoption of overlapping mesh method. The hydrodynamic performance of the two hull shapes in surge motion with variation of the angle of attack is compared. The results show that HG3 has less resistance and higher motion stability compared to HG1. With the angle of attack reaching 10 degrees, both HG1 and HG3 achieve the maximum lift-to-drag ratio, which is higher for HG3 compared to HG1. Furthermore, based on the numerical simulation of the plane motion mechanism test (PMM) and according to Routh’s stability criterion, the horizontal movement and vertical movement stability indexes of HG1 and HG3 (GHHG1=1.0, GVHG1=49.7, GHHG2=1.0, GVHG3=2.1) are obtained, which further show that the AUH has better vertical movement stability than the torpedo-shaped AUV. Furthermore, the scale model tail velocity experiment indirectly shows that HG3 has better hydrodynamic performance than HG1.

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