Development of a MRE isolation system for strapdown inertial measurement unit

Tao, Yu; Rui, Xiaoting; Yang, Fufeng; Hao, Beili

doi:10.1016/j.ymssp.2018.08.031

Cited by 22 publications

(8 citation statements)

References 22 publications

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“…IMU is the core component of the INS, which obtains the navigation information such as speed, position, and attitude of the carrier in real-time through processing and solving the inertial signals provided by the three-axis gyro and accelerometer [31]. A typical laser gyro IMU consists of a sensor supporting structure; an outer housing; vibration isolators (also called dampers); a group of orthogonally distributed measuring devices, such as three RLGs; and accelerometers.…”

Section: Structure Components Of Laser Gyro Imumentioning

confidence: 99%

Coupled Dynamic Analysis and Decoupling Optimization Method of the Laser Gyro Inertial Measurement Unit

Fang

Zeng

2019

Sensors

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The mechanical dithered ring laser gyro (RLG) effectively overcomes the lock-in effect and ensures the sensitive accuracy of the low angular rate for the gyro. However, in the inertial measurement unit (IMU) system, the dither excitation of three RLGs causes the coupled vibration of the IMU structure, which could seriously limit the measuring accuracy of RLGs. In this paper, the vibration frequency response characteristic of laser gyro IMU is taken as the focus point, and the method of multi-rigid body dynamics is used to establish the dynamic model of IMU suitable for vibration frequency response analysis. On the basis of the model, the multi-degree-of-freedom coupling vibration of IMU with the gyro dither excitation is clearly described. A new IMU dynamic decoupling optimization method is proposed to minimize the coupled vibration frequency response, and compared with the previous optimal design method. The prototype experimental test results show that the coupled vibration of IMU is restrained more effectively by the proposed new method than by the previous optimal design method. Finally, on the basis of this new method, the measuring accuracy of the RLGs in the IMU system is improved, which is quite useful for practical engineering application.

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Section: Structure Components Of Laser Gyro Imumentioning

confidence: 99%

Coupled Dynamic Analysis and Decoupling Optimization Method of the Laser Gyro Inertial Measurement Unit

Fang

Zeng

2019

Sensors

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“…Considering that the time delay in control systems may result in unsatisfied effect or system instability, the response time of MRE material was investigated (Zhu et al, 2018). Furthermore, time compensation strategy and phase compensation strategy were studied for control systems based on MRE (Fu et al, 2020;Yu et al, 2019). There are strategies about delay control for accurate modeling (Wu et al, 2010), but it is difficult to establish accurate models for MRE-based isolation systems with nonlinearity.…”

Section: Introductionmentioning

confidence: 99%

Dynamic modeling and vibration control for isolation systems based on magnetorheological elastomers

Zhu

Guo

et al. 2022

Journal of Intelligent Material Systems and Structures

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A fractional rheological model was developed for MRE-based isolation systems to investigate the influence of material elasticity and viscosity on the isolation effect. The identification of model parameters was realized by fitting experimental data of dynamic mechanical analysis for MRE structures. The superior rationality of modeling was reflected with the good consistency and repeatability. The transmissibility was calculated both theoretically and numerically. The method of numerical simulation was verified with an excellent agreement between theoretical and numerical results. The influence of model parameters on transmissibility and energy flow was analyzed to interpret the dynamic behavior of vibration isolation systems. A control strategy based on the coincidence frequency was developed for this MRE-based isolation system to protect the foundation or the sensitive equipment against periodic vibrations. The isolation effect was investigated from the prospect of transmissibility and energy flow. Eventually, the fuzzy control algorithm was adopted to isolate the sensitive equipment against random motions of the ground, and the effectiveness was further validated by comparing with the passive isolation.

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“…An adaptive isolator was developed when a suitable preload and magnetic field were applied together [27]. An MRE isolation system was developed to attenuate the severe vibration of inertial measurement units in three directions [28]. A new variable stiffness and damping isolator was verified in a scaled building with a Lyapunov-based control scheme [29].…”

Section: Introductionmentioning

confidence: 99%

A Novel MRE Adaptive Seismic Isolator Using Curvelet Transform Identification

Altabey

Noori

et al. 2021

Applied Sciences

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Magnetorheological elastomeric (MRE) material is a novel type of material that can adaptively change the rheological property rapidly, continuously, and reversibly when subjected to real-time external magnetic field. These new type of MRE materials can be developed by employing various schemes, for instance by mixing carbon nanotubes or acetone contents during the curing process which produces functionalized multiwall carbon nanotubes (MWCNTs). In order to study the mechanical and magnetic effects of this material, for potential application in seismic isolation, in this paper, different mathematical models of magnetorheological elastomers are analyzed and modified based on the reported studies on traditional magnetorheological elastomer. In this regard, a new feature identification method, via utilizing curvelet analysis, is proposed to make a multi-scale constituent analysis and subsequently a comparison between magnetorheological elastomer nanocomposite and traditional magnetorheological elastomers in a microscopic level. Furthermore, by using this “smart” material as the laminated core structure of an adaptive base isolation system, magnetic circuit analysis is numerically conducted for both complete and incomplete designs. Magnetic distribution of different laminated magnetorheological layers is discussed when the isolator is under compressive preloading and lateral shear loading. For a proof of concept study, a scaled building structure is established with the proposed isolation device. The dynamic performance of this isolated structure is analyzed by using a newly developed reaching law sliding mode control and Radial Basis Function (RBF) adaptive sliding mode control schemes. Transmissibility of the structural system is evaluated to assess its adaptability, controllability and nonlinearity. As the findings in this study show, it is promising that the structure can achieve its optimal and adaptive performance by designing an isolator with this adaptive material whose magnetic and mechanical properties are functionally enhanced as compared with traditional isolation devices. The adaptive control algorithm presented in this research can transiently suppress and protect the structure against non-stationary disturbances in the real time.

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Development of a MRE isolation system for strapdown inertial measurement unit

Cited by 22 publications

References 22 publications

Coupled Dynamic Analysis and Decoupling Optimization Method of the Laser Gyro Inertial Measurement Unit

Coupled Dynamic Analysis and Decoupling Optimization Method of the Laser Gyro Inertial Measurement Unit

Dynamic modeling and vibration control for isolation systems based on magnetorheological elastomers

A Novel MRE Adaptive Seismic Isolator Using Curvelet Transform Identification

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