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In this paper, we propose the design and test of a wideband MEMS electrostatic energy harvester with a dual resonant structure based on the out-of-the-plane gap closing scheme. It is fabricated using advanced MEMS technology, and the overall size is about 13 × 18 mm2, and comparing to traditional devices with single resonant frequency, the proposed device with dual resonant structure can resonate...
This paper reports a new design with dual resonant structure which is more efficient than single resonant devices for random vibration energy harvesting. The dual resonant structure consists of two spring-mass subsystems, which exhibits strong coupling when the two masses collide with each other. Experiments with piezoelectric elements show that the energy harvesting device with dual resonant structure...
This paper reports a biresonant structure of piezoelectric energy harvester (PEH), which consists of two cantilevers with resonance frequencies of 15Hz and 22Hz, The vibration amplitudes of two cantilever-mass structures produce strongly coupling with increase of acceleration. The experimental results show that the operating bandwidth is broadened to 14Hz (14Hz–28Hz) at the acceleration of 1g(1g=9...
This paper presents the design and testing of a wideband electrostatic energy harvester. The vibration amplitudes of two cantilever-mass structures produce strongly coupling when two cantilevers is very close caused by the external acceleration. Therefore, the output power up to 22–35 µW can be achieved at acceleration value of 4.5 m/s2 in an external vibration frequency range from 42 Hz to 50 Hz,...
An automated gait pattern discrimination method based on Hidden Markov Model (HMM) was proposed in this paper. According to human gait process, the acceleration signals of human lower limb were divided into different segments and the gait features was extracted by wavelet transform. Then, each state of gait was matched with HMM state and the HMM of each gait mode was trained according to the sample...
In this paper, we put forward a coupled electromechanical model with differential equation arrays for an electret-based energy harvester with out-of-the plane gap closing scheme. The model is numerically solved for output voltage and displacement of the moveable electrode with given parameters by Matlab/Simulink software. Furthermore, system optimization is carried out using the coupled model to find...
This paper establishes a 15 degree-of-freedom full-car dynamic model for the car of Hongqi HQ3. Output feedback active suspension is designed based on a half-car model. Good ride comfort is achieved by minimizing the H2 norm from disturbances of the road to the vertical acceleration and the pitch acceleration of the car, while safety constraints such as normalized suspension dynamic travels, static/dynamic...
A complete flight control scheme with detailed design methodology is proposed for an indoor miniature coaxial helicopter with fixed collective pitch. To avoid system complexity and the problem of minimum phase control, the helicopter dynamic model is decomposed into two cascaded subsystems: an inner one for attitude and heading control and the outer one for trajectory control. H-infinity control technique...
In order to reduce the fatal damage of tire blowout during vehicle operation, a differential flatness based model predictive controller is proposed. A 3 degrees of freedom (DOF) vehicle dynamics model with tire blowout is established, and then the flat outputs are given. The flatness property of the vehicle dynamics is discussed accordingly, and the MPC for the vehicle with a tire blowout stability...
Human bipedal walking is symmetrical, stable and efficiency optimal. To clarify the essential relationship in human gait, accelerometers and rate gyroscopes are mounted on waist and lower extremities of subject to acquire kinematics information during walking. By employing Principal Component Analysis (PCA), kinematics signals of one side are reconstructed using that of opposite side. The reconstructed...
Gait analysis is an important part of intelligent prosthesis researching. The automatic segmentation and classification of gait kinematic signal could help intelligent prosthesis to get better control performance. Much feature extraction method was employed by researchers, but it could still be improved. The wavelet based filter is adopted in this paper to segment the gait kinematics data, and LDA/SVM...
This paper discusses the development of guidance scheme for multiple missiles co-operation engagement. Firstly, based on the intercept point, the mid-course guidance out of the aerosphere is studied to obtain the shutdown condition. Secondly, using the the linearization of the control model and error feedback loop in the mid-course guidance out of the aerosphere, a new guidance law called ITCG (Impact-Time-Control...
Previous condition monitoring products classify the wind turbine operation condition based on one operation parameter. And a series of monitoring alarm thresholds are defined for each one of the classified wind turbine operation conditions. This leads to a lot of false alarms during the application of condition monitoring system of wind turbine. This paper uses multiple operation parameters to classify...
This paper discusses an embedded and teleoperation technology-based, the use of Internet to achieve real-time remote device control system,embedded ARM processor S3C2410 as a network server, CAN bus as a multi-robot remote control bus operating system.It realizes bilateral communication between control command and feedback data of the master-slave robot, and enhances the performance of stability....
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