Optimized design method of vibration isolation system in mechanically dithered RLG POS based on motion decoupling

Junchao, Cheng; Fang, Jiancheng; Wu, Wenqi; Li, Jianli

doi:10.1016/j.measurement.2013.11.019

Cited by 11 publications

(12 citation statements)

References 10 publications

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“…The similar decoupling studies can be found in the literatures [23][24][25][26], such as Equations (16)- (18) in the work of [23], Section 3.1 in the work of [25], and Section 4 in the work of [26]. Among the above previous studies, the work of [26] is the relatively recent study on the optimal design of the laser gyro IMU, where a new skewed redundant IMU by employing four RLGs is designed, and the dithered coupling of RLGs in the redundant configuration of IMU is considered.…”

Section: Discussion Of Coupled Vibration Behavior Of Imusupporting

confidence: 80%

“…Unlike the work of [26], other papers [23][24][25] propose similar decoupling conditions (i.e., the inertia product in the mass matrix is 0, namely I xy = I xz = I yz = 0) as Equations (24) and (25) in this paper.…”

Section: Discussion Of Coupled Vibration Behavior Of Imumentioning

confidence: 89%

“…By comparing the IMU dynamic decoupling conditions in Equations (24) and (25) and the previous decoupling conditions in the works of [23][24][25], some conclusions could be derived as follows:…”

Section: Discussion Of Coupled Vibration Behavior Of Imumentioning

confidence: 99%

“…In terms of the optimal design of the laser gyro IMU structure, a dynamic-vibration-absorber-type solution was implemented on the inertial sensor assembly by Jamil [22] to improve the response of the IMU structure to the RLG's dither. Subsequently, many researchers focused on the IMU dither decoupling, and proposed the relevant optimal design principles [23][24][25] such as the design requirements of the overlap between the IMU centroid and the center of the multiple-damper layout, and that between the gyro sensitive axis and the principle inertia axis of IMU.…”

Section: Introductionmentioning

confidence: 99%

“…Although the design principles [23][24][25] are proposed, they are sometimes difficult to be satisfied in practical engineering owing to various constraints such as the size of IMU and the installation mode of printed circuit board (PCB) in actual IMU or INS design. Secondly, these design principles are not available for some new structures of IMU, that is, the skewed redundant INS [26], as the orthogonal layouts of the RLGs in the new types of IMU are always impossible.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

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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