Huibin Xu

Bio: Huibin Xu is an academic researcher. The author has contributed to research in topics: Magnet & Magnetic circuit. The author has an hindex of 6, co-authored 15 publications receiving 175 citations.

Giant magnetostrictive actuators for active vibration control

Abstract: Giant magnetostrictive actuators are designed and fabricated with home-made TbDyFe magnetostrictive rods. The corresponding static and dynamic characteristics are tested. The total output displacement can be obtained up to 100 µm and the output force up to 1500 N. The dynamic responses of input and output are accordant and have a small hysteresis. Experiments on active vibration control are implemented in single-degree-of-freedom (DOF) and six-DOF platforms in a flexible space structure. The excellent damping effect, up to 30 dB, proves the good performance of the actuators, the feasibility of the control algorithms, and the reasonable design of the six-DOF platform.

Dynamic magnetostrain properties of giant magnetostrictive alloy actuators for damping

Abstract: Giant magnetostrictive alloy (GMA) actuators are tending to replace piezoelectric actuators in many applications owing to their giant magnetostrain and fast response. In an active vibration control system using GMA actuators, the investigation of dynamic magnetostrain can supply the basis for the optimization of actuator designs and control algorithms. Experiments have been carried out under varied operating conditions. The results show that there is a better dynamic output only at suitable prestress and magnetic bias values. For a fixed frequency, the output is basically proportional to the input amplitude but the inclination is slightly different for each input frequency. The natural frequency of the actuator is around 5 Hz and the output displacement decreases with frequency increase after 10 Hz. The dynamic magnetostrain at the natural frequency can be larger than the quasi-static value by up to 40%.

Super magnetostriction material vibration actuator

Abstract: The utility model discloses a giant magnetostrictive material damping actuator, which comprises a shell body, a leading wire plug and an output rod. An upper and a lower end covers and an upper and a lower positioning boards are connected with the shell body through a screw thread, a protruding edge is positioned on the output rod, the output rod penetrates the centers of the upper positioning board and the upper end cover and extends outside the shell body, the protruding edge is positioned between the upper end cover and the upper positioning board, a groove for placing the disc spring is provided below the upper end cover, an inner radius of the groove is bigger than an outer radius of the disc spring, a bracket penetrates a center of the lower positioning board and supports a magnetostrictive stick, a coil frame winded with a driving coil is provided on the periphery of the magnetostrictive stick, a permanent magnet is positioned between the coil frame and an inner wall of the shell body, which is also placed between the upper and the lower positioning boards; the regulating holes are provided on the upper and the lower end covers, which are used to regulate the relative position between the upper and the lower end covers and the shell body. The utility model is a damping actuator, which has a simple structure, fast frequency response,large strain,wide frequency band and low driving voltage.

Micro-shift giant magnetostriction material actuator

Abstract: The present invention discloses a micrometric displacement huge magnetostriction material actuator, which comprises a magnetic coupler, a magnetic yoke, a magnetostrictive rod, an electromagnetic coil, an upper permanent magnetic ring, a lower permanent magnetic ring, an output bar, a disc spring and a lower end cap arranged on bottom of a shell. Wherein, a convex part of the lower end cap is circumferentially arranged with the lower permanent magnetic ring. An end face of the convex part is arranged with the magnetostrictive rod. The electromagnetic coil is twisted on the magnetostrictive rod. The magnetic coupler is positioned on an upper end face of the magnetostrictive rod. The upper permanent magnetic ring and the magnetic yoke arranged out of the magnetic coupler from bottom to top. An upper end face of the magnetic coupler closely contacts a lower end face of a flange end of the output bar. The disc spring is mounted between the output bar flange and the lower end face of the upper end face. A screw hole is positioned at center of the output bar. The present invention has the advantages that the upper permanent magnetic ring and the lower ring can provide an even bias magnetic field for a Phi 8 swung dash 50 is multiplied by 10 swung dash 100mm magnetostrictive rod. A vertical layout of the permanent magnet and the coil can reduce radial size of the actuator. A closed magnetic circuit is composed of an excitation magnetic field, a bias magnetic field, a magnetic coupler and a magnetic yoke, thus improving efficiency of the actuator. The present invention has the advantages of small size, high performance and reliable and stable operation.

Laves phases: a review of their functional and structural applications and an improved fundamental understanding of stability and properties

Abstract: Laves phases with their comparably simple crystal structure are very common intermetallic phases and can be formed from element combinations all over the periodic table resulting in a huge number of known examples. Even though this type of phases is known for almost 100 years, and although a lot of information on stability, structure, and properties has accumulated especially during the last about 20 years, systematic evaluation and rationalization of this information in particular as a function of the involved elements is often lacking. It is one of the two main goals of this review to summarize the knowledge for some selected respective topics with a certain focus on non-stoichiometric, i.e., non-ideal Laves phases. The second, central goal of the review is to give a systematic overview about the role of Laves phases in all kinds of materials for functional and structural applications. There is a surprisingly broad range of successful utilization of Laves phases in functional applications comprising Laves phases as hydrogen storage material (Hydraloy), as magneto-mechanical sensors and actuators (Terfenol), or for wear- and corrosion-resistant coatings in corrosive atmospheres and at high temperatures (Tribaloy), to name but a few. Regarding structural applications, there is a renewed interest in using Laves phases for creep-strengthening of high-temperature steels and new respective alloy design concepts were developed and successfully tested. Apart from steels, Laves phases also occur in various other kinds of structural materials sometimes effectively improving properties, but often also acting in a detrimental way.

A model of magnetostrictive actuators for active vibration control

Abstract: One of the most frequent applications of magnetostrictive actuator technology is the active structural vibration control (AVC). Magnetostrictive actuators (MAs) can deliver high-output forces and can be driven at high frequencies. These characteristics make them suitable for a variety of vibration control applications. The use of this technology, however, requires an accurate knowledge of the dynamics of such actuators. Several models are available in the literature. However, their use in control applications, characterized by high dynamics, is often limited by nonlinearities and complexity of the model. To overcome this difficulty, the paper introduces a linear model of magnetostrictive actuators that is valid in a range of frequencies below 2 kHz. The assumptions supporting the linearity of the system are discussed and the theoretical model is presented. Finally the model is validated through experimental tests carried out on two different magnetostrictive actuators.

Compensation of Hysteresis Nonlinearity in Magnetostrictive Actuators With Inverse Multiplicative Structure for Preisach Model

Abstract: Compensation of hysteresis nonlinearities in smart material based actuators presents a challenging task for their applications. Many approaches have been proposed in the literature, including the inverse multiplicative scheme. The advantage for such a scheme is to avoid direct model inversions. However, the approach is mainly developed for the Bouc-Wen model. Focusing on the Preisach model which is utilized to describe magnetostrictive actuators, in this paper an inverse compensation approach for Preisach model using the inverse multiplicative structure is developed. Since the input signal is implicitly involved in the Preisach model, it imposes a great challenge to construct the inverse function of the model. To obtain an explicit expression of the input signal from its implicit form so that the inverse multiplicative technique can be applied, the Preisach model is decomposed into a non-memory part and memory part. Using this separation, it only requires to solve the inverse of the non-memory part to obtain an explicit expression of the input signal, thus avoiding constructing the inverse for entire complex dual integral formulation of the Preisach model. Experimental results for a magnetostrictive actuator demonstrate the effectiveness of the proposed approach.