Baiping Yan

Bio: Baiping Yan is an academic researcher from Zhejiang University. The author has contributed to research in topics: Inverse magnetostrictive effect & Actuator. The author has an hindex of 5, co-authored 10 publications receiving 53 citations. Previous affiliations of Baiping Yan include Harbin Institute of Technology.

Design and Fabrication of a High-Efficiency Magnetostrictive Energy Harvester for High-Impact Vibration Systems

Abstract: This paper presents the design and fabrication of a vibration energy harvester based on giant magnetostrictive material, which consists of one coil-wound Terfenol-D rod with a permanent magnet (PM) and air gap in each magnetic circuit, and the PM array on the part of a cap amplifier. In this design, cap amplifiers and variable air gap are used to increase the harvesting effect of systems under environmental impact. Modeling and simulation are developed and performed to validate the concept. The relation of magnetic field in Terfenol-D rod is derived, and its uniformity and intensity are analyzed. Then, principal design parameters of the harvester, air gap, and cap amplifiers are determined, and its static analysis of the harvesting effect is performed. In addition, a prototype is fabricated and tested. The magnetostrictive-based vibration energy harvester can generate larger voltage and power than conventional smart harvesters and they can be safely used under the impact up to 20–30 MPa.

Research of Fast-Response Giant Magnetostrictive Actuator for Space Propulsion System

Abstract: This paper presents a flow regulator based on a fast-response giant magnetostrictive actuator (GMA). The finite-element method is adopted for analyzing and optimizing the magnetic circuit structure of the GMA, and the influence of structural parameters on the driving magnetic field uniformity is summarized. Based on the analysis and output demand, a prototype of the GMA driven by a Φ5 × 40 mm giant magnetostrictive material rod is made, and a test bench is set. The result shows that the static output displacement is about 47.1 μm. With a flexure hinge working as the displacement amplification structure, the maximum opening displacement of the flow regulator is about 240 μm, and the response time is less than 1 ms. Using nitrogen (N2) as the working medium, the mass flow rate of the giant magnetostrictive regulator is 12 g/s at 3 MPa.

Research of core loss of permanent magnet synchronous motor (PMSM) in AC servo system

Abstract: Loss leads to motor temperature rise, and then influences the performance of motor material, so as to limit the improvement of motor running performance and lifetime. The characteristics of high reliability, high speed and big torque are required in some special areas, such as aerospacecraft, weapons. Also the high performances attach tightly with the core loss. So the calculation of motor core loss is one important evidence of its research and application. Based on the 2D time-step finite element analysis of the electromagnetic field of the PMSM, which is used in missile actuator system, the loss of the stator is calculated in this paper. The isolation core loss model which divides core loss into hysteresis loss, eddy current loss and additional loss is adopted. The magnetization way of core is analyzed, and the Fourier analysis and orthogronal decomposition are used to deal with the magnetic flux density waveforms. Afterwards, the core loss characteristic of PMSM in AC servo system is researched. Finally, the experimental and calculation results are in the satisfactory agreement, which provides a basis for the core loss calculation of motor in servo system.

Design and construction of magnetostrictive energy harvester for power generating floor systems

Abstract: In this paper, a new prototype of magnetostrictive-based vibration energy harvester for power generating floor systems is presented, and its structure is constructed. The harvester utilizing the Villari effect (inverse-magnetostrictive effect) consists of a coil-wound Terfenol-D rod. To generate more electrical power, a PM (fixed on the part of cap amplifier) and variable-length air-gap are designed in each magnetic circuit, which helps to enlarge Villari effect in Terfenol-D rod in the action of environmental vibration. The magnetic field and its leakage in harvester are analyzed, and principal design parameters of harvester are optimally determined. Then, a prototype is fabricated and tested, and its harvesting effect is calculated. The harvester exhibits high power density, can generate up to 0.022 T/MPa piezomagnetic effect and safely used in up to 20MPa transient impact.

Modelling self-sensing of a magnetostrictive actuator based on a terfenol-D rod

Abstract: A simplified quasi-static computational model for self-sensing applications of magnetostrictive actuators based on terfenol-D rods is presented. Paths and angle changes in the magnetic moments rotation of Tb0.3Dy0.7Fe2 alloy are studied as functions of compressive stress and magnetic field, and then used to determine the magnetization in its actuation. Then sensing of magnetic induction picked from a driving coil in an actuator is derived. The model is quick and efficient to solve moments rotation and its magnetization. Sensing results of compressive stress and magnetostriction calculated by the model are in good agreement with experiments and will be helpful in the design and control of self-sensing applications in actuators.

Mechanical modulations for enhancing energy harvesting: Principles, methods and applications

Abstract: Mechanical kinetic energy harvesting, which converts the mechanical motions and vibrations that are commonly available in the surrounding environment to electrical energy, can realize self-power sensing, control and actuation, with the advantages of convenience, energy saving, ecofriendliness and sustainability. It has broad application prospects in the fields of aerospace, biomedical engineering, environmental monitoring and military engineering. The forms of mechanical energy in the ambient are various and may be time-varying, and its direct conversion to electrical energy may result in low output power, low conversion efficiency, and even damage to the device. In order to improve the performance of energy harvester, the mechanical energy can be mechanically modulated and then be converted to electrical energy. In this paper, the key roles of mechanical modulations for energy harvesting are emphasized. The methods and principles of mechanical modulations and their applications to energy harvesting systems are reviewed and classified into three categories: excitation type conversions, frequency up-conversions, force/motion amplifications. The prospects of the research on mechanical modulation based energy harvesting are also presented.

A review on design improvements and techniques for mechanical energy harvesting using piezoelectric and electromagnetic schemes

Abstract: Energy harvesting has gained a growing attention and has seen great advancements during the last decades. Among energy sources, mechanical energy is one of the most investigated forms due to its abundance, accessibility and ubiquity in the environment, in addition to multiple possible transduction types. Several reviewing articles have been published to organize and categorize these works. Nonetheless, some concepts are missing in most reviews and some improvement strategies have been overlooked such as non-resonant and multi-directional systems, etc. We present in this paper an exhaustive reviewing study of the state-of-the-art of mechanical harvester systems, enclosing main different existing improvement techniques and their design concept, particularly for piezoelectric and electromagnetic (EM) transductions. Accordingly, we propose a new generic categorization approach based on the improvement aspect of the harvester, which includes techniques for widening operating frequency, conceiving a non-resonant system and multidirectional harvester. In the category of widening operating frequency, three approaches are conceivable allowing the improvement of the system frequency response, which are: frequency tuning, multi-frequency and non-linear system. For non-resonant systems, possible approaches consist in Frequency-up conversion and free moving mass. The last improvement allows multiplying the directions to harvest more energy from arbitrary movements. Last section is interested in the applicability of the presented techniques under different conditions and their compatibility with MEMS technology.

Review of magnetostrictive vibration energy harvesters

Abstract: The field of energy harvesting has grown concurrently with the rapid development of portable and wireless electronics in which reliable and long-lasting power sources are required. Electrochemical batteries have a limited lifespan and require periodic recharging. In contrast, vibration energy harvesters can supply uninterrupted power by scavenging useful electrical energy from ambient structural vibrations. This article reviews the current state of vibration energy harvesters based on magnetostrictive materials, especially Terfenol-D and Galfenol. Existing magnetostrictive harvester designs are compared in terms of various performance metrics. Advanced techniques that can reduce device size and improve performance are presented. Models for magnetostrictive devices are summarized to guide future harvester designs.

Review of Modeling and Control of Magnetostrictive Actuators

Abstract: Magnetostrictive actuators play an important role in the perception of usefulness of smart materials and devices. Their applications are potentially wider than that of piezoelectric actuators because of the higher energy density and intrinsic robustness. However, the non-negligible hysteresis and complexity of their characteristics make the design and control quite difficult and has limited their diffusion in industrial applications. Nevertheless, the scientific literature presents a wide offer of results in design and geometries, modeling and control that may be exploited for applications. This paper gives a reasoned review of the main results achieved in the literature about design, modeling and control of magnetostrictive actuators exploiting the direct effects of magnetostriction (Joule and Wiedemann). Some perspectives and challenges about magnetostrictive actuators development are also gathered.