Abstract
This paper focuses on the stability of three homodromy vibrators in a vibrating system with two rigid frames (RFs). The motion differential equations of the system are established. Using the average method yields the average coupling torque balanced equations of three vibrators, and the simplified analytical expressions for synchronization and stability criterions of the system were derived. The coupling dynamic characteristics were numerically analyzed, including frequency-amplitude response, stable phase differences, synchronization and stability ability, and phase relationships. The simulations to verify the validity of theoretical results were carried out. It is shown that the stable states of the system are classified into three types, thereof the stability of phase differences among vibrators is similar in sub-resonant and super-resonant states, which results in no vibration of the system. While in near sub-resonant state the system reflects strong useful positive superposition vibration with energy saving, which is exactly the desire in engineering design.
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Abbreviations
- f 0 i :
-
Damping coefficient of the induction motor i, i = 1, 2, 3
- f jx :
-
Damping constant of the RF j in x-direction, j = 1, 2
- k jx :
-
Stiffness of the spring in x-direction, i = 1, 2, 3
- m 1 :
-
Mass of the RF1
- m 2 :
-
Mass of the RF2
- m 0 :
-
Mass of the standard vibrator
- m 0 i :
-
Mass of the vibrator i, m0i = m0, i = 1, 2, 3
- m :
-
Induced mass of the vibrating system, m = M′1M′2/(M′1+ M′2), M′1 ≈ M1, M′2 = M2
- M :
-
Mass of the total vibrating system, M = M1 + M2, M1 = m1, M2 = m2 + m01 + m02 + m03
- r i :
-
Eccentric radius of three vibrators, ri = r, i = 1, 2, 3
- r m :
-
Mass ratio between the standard vibrator and the total vibrating system, rm = m0/M
- r m1 :
-
Mass ratio between the RF1 and the total system, rm1 = M1/M
- r m2 :
-
Mass ratio between the standard vibrator and the RF2, rm2 = m0/M2
- T ei :
-
Electromagnetic torque of the induction motor i, i = 1, 2, 3
- T e0 i :
-
Electromagnetic torque of the induction motor i operating steadily, i = 1, 2, 3
- z i :
-
Frequency ratio between the operating frequency and natural frequencies, zi = ωm0/ωi, i = 0, 1
- ω m0 :
-
Synchronous angular velocity of three vibrators when the induction motors operate steadily
- ω 1 :
-
Natural frequency of the RF1, \({\omega _1} = \sqrt {\left( {{k_{1x}} + {k_{2x}}} \right)/{M_1}} \)
- ω 0 :
-
Natural frequency of the main vibrating system, \({\omega _0} = \sqrt {{k_{2x}}/m} \)
- ω g :
-
Natural frequency of the isolated vibrating system, \({\omega _g} = \sqrt {{k_{1x}}/M} \)
- γ jx :
-
Phase lag angle of the RF j in x-direction, j = 1, 2
- ξ jx :
-
Critical damping ratio of the RF j in x-direction, j = 1, 2
- η i :
-
Mass ratio between the vibrator i and the standard vibrator, ηi = m0i/m0, i = 1, 2, 3
- \((\dot \bullet )\) :
-
d ● /dt
- \((\ddot \bullet )\) :
-
d2 ● /dt2
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Acknowledgments
This work was supported by the National Natural Science Foundations of China [grant number 51675090], the Fundamental Research Funds for the Central Universities [grant number N170304013] and China Postdoctoral Science Foundation [grant number 2017M621145].
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Recommended by Associate Editor Dongho Oh
Xueliang Zhang received his Ph.D. from Northeastern University, Shenyang, China. He is currently an Associate Professor in the School of Mechanical Engineering and Automation, Northeastern University, China. His research interests include synchronization theory, vibration utilization engineering, and nonlinear vibration in engineering.
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Zhang, X., Wang, Z., Li, C. et al. Comments on the stability of the synchronous states of three vibrators in a vibrating system with two rigid frames. J Mech Sci Technol 33, 4659–4672 (2019). https://doi.org/10.1007/s12206-019-0909-6
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DOI: https://doi.org/10.1007/s12206-019-0909-6