Dynamic Analysis of Hula Hoop Motion and Optimized Energy Harvest Circuit

2013 ◽  
Author(s):  
T.-C. Huang ◽  
W.-D. Chen ◽  
C. X. Lu ◽  
Paul C.-P. Chao ◽  
C.-H. Tsai ◽  
...  
Keyword(s):  
Dynamic Analysis ◽  
Experimental System ◽  
Force Balance ◽  
Asymptotic Solutions ◽  
Energy Harvest ◽  
Energy Scavenging ◽  
The Novel ◽  
Electric Circuits ◽  
Nonlinear Solutions ◽  
Nonlinear Dynamic Modeling

The nonlinear dynamics of hula hoop motion is deciphered in this study by nonlinear dynamic modeling techniques to find solution and stability analysis. This is different from the previous study [1], where a homotopy method is employed. The analysis results are capable of transforming linear reciprocating motion into rotational motion. The dynamic governing equations of the system are first successfully derived by force balance. The non-linear dynamic analysis is next applied to derive approximate, asymptotic solutions. Stabilities associated with all solution are determined by subsequent analysis on the derived asymptotic solutions. In addition, the transformer could be integrated with coils, magnets, and electric circuits to form a portable energy scavenging device. A novel front-end circuit is proposed in this work for harvesting human’s energy. The situation of human’s walking and running is simulated by a shaker. And the ac-like energy is processed by the novel energy harvesting circuit, transformed as a DC voltage suitable for devices successfully. The efficiency of the entire circuit is proven up to 60%, and is an input-powered circuit with no standby power. A complete experimental system is also designed and successfully confirm the existence of the stable nonlinear solutions found by analytical and numerical analysis.

Dynamic Analysis of a Motion Transformer Mimicking a Hula Hoop

2009 ◽  
Author(s):  
C. X. Lu ◽  
C. C. Wang ◽  
C. K. Sung ◽  
Paul C. P. Chao
Keyword(s):  
Dynamic Analysis ◽  
Homotopy Perturbation Method ◽  
The Body ◽  
Energy Scavenging ◽  
Electric Circuits ◽  
Main Mass ◽  
Transformer Design ◽  
Varied System ◽  
Steady State Solutions ◽  
Lagrange’S Method

Hula-hoop motion refers to the spinning of a ring around a human body; it is made possible by the interactive force between the moving ring and the body. Inspired by the generic concept of hula-hoop motion, this study proposes a novel motion transformer design that consists of a main mass sprung in one translational direction and a free-moving mass attached at one end of a rod, the other end of which is hinged onto the center of the main mass. It is expected that the transformer is capable of transforming linear reciprocating motion into rotational motion. In addition, the transformer could be integrated with coils, magnets, and electric circuits to form a portable energy scavenging device. A thorough dynamic analysis of the proposed transformer system is conducted in this study in order to characterize the relationships between the varied system parameters and the chance of hula-hoop motion occurrence. The governing equations are first derived by using Lagrange’s Method, which is followed by the search for steady-state solutions and the corresponding stability analysis via the homotopy perturbation method and Floquet theory. Direct numerical simulation is simultaneously performed to verify the correctness of the approximate analysis. In this manner, the feasibility of the proposed design and the occurrence criteria of hula-hoop motion are assessed.

Modeling and Dynamic Analysis of a Novel Hydro-Pneumatic Suspension System

2015 ◽  
Vol 772 ◽  
pp. 188-191
Author(s):  
L. Yang ◽  
Fan Yang ◽  
M.B. Xia
Keyword(s):  
Dynamic Analysis ◽  
Mass Conservation ◽  
Suspension System ◽  
Force Balance ◽  
Optimization Approach ◽  
The Novel ◽  
Good Match ◽  
Pneumatic Suspension ◽  
Simulation Results ◽  
Gas Chamber

This study presents a modeling procedure and dynamic analysis for a novel hydro-pneumatic suspension system, in which the gas chamber has been integrated into the main structures. The modeling of the novel hydro-pneumatic suspension system has been established based on the mass conservation and force balance and the dimension has been obtained through a design optimization approach. The simulation results of the established model have been compared with those obtained through ADAMS, and good match can be observed.

Dynamic Analysis of a Motion Transformer Mimicking a Hula Hoop

2011 ◽  
Vol 133 (1) ◽  
Author(s):  
C. X. Lu ◽  
C. C. Wang ◽  
C. K. Sung ◽  
Paul C.P. Chao
Keyword(s):  
Dynamic Analysis ◽  
Homotopy Perturbation Method ◽  
The Body ◽  
Energy Scavenging ◽  
Electric Circuits ◽  
Main Mass ◽  
Transformer Design ◽  
Varied System ◽  
Steady State Solutions ◽  
Lagrange’S Method

Hula-hoop motion refers to the spinning of a ring around a human body; it is made possible by the interactive force between the moving ring and the body. Inspired by the generic concept of hula-hoop motion, this study proposes a novel motion transformer design that consists of a main mass sprung in one translational direction and a free-moving mass attached at one end of a rod, the other end of which is hinged onto the center of the main mass. It is expected that the transformer is capable of transforming linear reciprocating motion into rotational motion. In addition, the transformer could be integrated with coils, magnets, and electric circuits to form a portable energy scavenging device. A thorough dynamic analysis of the proposed transformer system is conducted in this study in order to characterize the relationships between the varied system parameters and the chance of hula-hoop motion occurrence. The governing equations are first derived with Lagrange’s method, which is followed by the search for steady-state solutions and the corresponding stability analysis via the homotopy perturbation method and the Floquet theory. Direct numerical simulation is simultaneously performed to verify the correctness of the approximate analysis. In this manner, the feasibility of the proposed design and the occurrence criteria of hula-hoop motion are assessed.

scholarly journals Research on a Novel Fabry–Perot Interferometer Model Based on the Ultra-Small Gradient-Index Fiber Probe

Sensors ◽  
2019 ◽  
Vol 19 (7) ◽  
pp. 1538 ◽  
Author(s):  
Chi Wang ◽  
Jianmei Sun ◽  
Chenye Yang ◽  
Bin Kuang ◽  
Dong Fang ◽  
...  
Keyword(s):  
Output Voltage ◽  
Experimental System ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Gradient Index ◽  
The Novel ◽  
Fiber Probe ◽  
Model Based ◽  
Fabry Perot ◽  
Working Distance

A novel Fabry–Perot (F–P) interferometer model based on the ultra-small gradient-index (GRIN) fiber probe is investigated. The signal arm of the F–P interferometer is organically combined with the ultra-small GRIN fiber probe to establish the theoretical model of the novel F–P interferometer. An interferometer experimental system for vibration measurements was built to measure the performance of the novel F–P interferometer system. The experimental results show that under the given conditions, the output voltage of the novel interferometer is 3.9 V at the working distance of 0.506 mm, which is significantly higher than the output voltage 0.48 V of the single-mode fiber (SMF) F–P interferometer at this position. In the range of 0.1–2 mm cavity length, the novel interferometer has a higher output voltage than an SMF F–P interferometer. Therefore, the novel F–P interferometer is available for further study of the precise measurement of micro vibrations and displacements in narrow spaces.

Dynamic Behavior Analysis of Touchdown Process in Active Magnetic Bearing System Based on Kalman Filtering

2014 ◽  
Author(s):  
Zhe Sun ◽  
Xiao Kang ◽  
Jingjing Zhao ◽  
Guojun Yang ◽  
Zhengang Shi
Keyword(s):  
Dynamic Analysis ◽  
Dynamic Model ◽  
Kalman Filtering ◽  
Experimental System ◽  
Magnetic Bearing ◽  
Active Magnetic Bearing ◽  
Extended Kalman Filtering ◽  
Experiment Data ◽  
Filtering Technique ◽  
Bearing System

Magnetic bearings are widely applied in High Temperature Gas-cooled Reactor (HTGR) and auxiliary bearings are important backup and safety components in AMB systems. The dynamic analysis of the AMB rotors touchdown process is an important foundation for designing auxiliary bearings. In this paper, a data-based dynamic analysis of the touchdown process is proposed. The dynamic model of the touchdown process is firstly established and then the nonlinear extended Kalman filtering technique is applied. Based on the dynamic model and Kalman filtering technique, the proposed method can offer estimations of rotor’s displacements, velocities and accelerations from noisy observations. The proposed method is validated by the experiment data from touchdown experiments. The touchdown experiments are performed on an experimental system with a 440kg heavy rotor, the rotational speed in the experiments is 5000RPM and no brake is applied.

An introduction to the novel vacuum plume effects experimental system

2016 ◽  
Vol 59 (6) ◽  
pp. 953-960 ◽  
Author(s):  
GuoBiao Cai ◽  
GuiLong Ling ◽  
BiJiao He
Keyword(s):  
Experimental System ◽  
The Novel

A Novel Two Degrees of Freedom Rotational Decoupled Parallel Mechanism

2012 ◽  
Vol 215-216 ◽  
pp. 293-296 ◽  
Author(s):  
Yu Lei Hou ◽  
Da Xing Zeng ◽  
Zhan Ye Zhang ◽  
Chang Mei Wang ◽  
Xin Zhe Hu
Keyword(s):  
Control System ◽  
Dynamic Analysis ◽  
Spatial Orientation ◽  
Parallel Mechanism ◽  
Degrees Of Freedom ◽  
Screw Theory ◽  
The Novel ◽  
Two Degrees Of Freedom ◽  
Application Fields

In the field of spatial orientation, the rotational parallel mechanism is widely used. While the existence of coupling brings about the parallel mechanism some difficulties in kinematics and dynamic analysis, the development of control system, and so on. This condition restricts the application fields and effects of the rotational parallel mechanism. Therefore, this paper proposes a novel 2-DOF (two degrees of freedom) rotational DPM (decoupled parallel mechanism). The feature of the mechanism is described and their movement form is analyzed with screw theory. The proposition of the novel rotational DPM will enrich the configurations of the parallel mechanism, and the contents of this paper should be useful for the further research and application of the rotational parallel mechanism.

Research on the Mechanics of a Novel Pulsed Micro-Injection System

2011 ◽  
Vol 403-408 ◽  
pp. 3748-3752
Author(s):  
Yong Gui Lv ◽  
Kai Chen
Keyword(s):  
Theoretical Model ◽  
Piezoelectric Actuator ◽  
Injection Pressure ◽  
Experimental System ◽  
Injection System ◽  
The Novel ◽  
Liquid Injection ◽  
Injection Mechanism ◽  
Injection Technology ◽  
Rising Time

Aiming at the inadequacies of the existing liquid injection mechanism, a novel pulsed micro-injection technology based on an amplification piezoelectric actuator (APA) was presented. The mechanics of the micro-injection was investigated. The theoretical model among the parameters of flow velocity, orifice’s dimension, amplitude and rising time of the pulsed signal was established. A micro-injection experimental system was established. The injection pressure out of the orifice was measured. Results show this novel micro-injection technology is feasible, and future development of the novel injection systems is possible.

scholarly journals Seismic Risk Assessment of a Novel Self-Centering Precast Concrete Frame under Near-Fault Ground Motions

2020 ◽  
Vol 10 (18) ◽  
pp. 6510
Author(s):  
Fangfang Geng ◽  
Youliang Ding ◽  
Honglei Wu ◽  
Kang Yang
Keyword(s):  
Risk Assessment ◽  
Dynamic Analysis ◽  
Seismic Performance ◽  
Seismic Risk ◽  
Precast Concrete ◽  
Time History ◽  
Seismic Intensity ◽  
The Novel ◽  
Concrete Frame ◽  
Near Fault

The damage to structures caused by the velocity pulse effect of near-fault earthquake waves cannot be ignored, yet there are few studies on the risk assessment of seismic performance for precast concrete frame under near-fault earthquake waves. A novel self-centering precast concrete (SCPC) frame with hysteretic dampers is proposed to obtain great self-recovering and energy consumption characteristics. To accurately assess the seismic behaviors of the novel SCPC frame under the near-fault earthquake waves, a prototype structure is modelled and elastoplastic dynamic analysis is conducted at the design basis earthquake (DBE) and the maximum considered earthquake (MCE) seismic levels. Incremental dynamic analysis and the vulnerability analysis are performed. Annual and 50-year exceeding probabilities of the novel SCPC frame are calculated afterwards. In addition, the reinforced concrete (RC)frame and the traditional SCPC frame are also modelled, whose section sizes, reinforcements arrangement and seismic intensity are consistent with the novel SCPC frame. The dynamic time-history analysis at the two seismic levels are also carried out for two types of frames. The analysis results demonstrate that the novel SCPC frame has great seismic performance and low seismic risk possibility under the near-fault earthquakes loading.

Sign in / Sign up

Export Citation Format

Share Document