Erratum to: “Hierarchical Thermal Models of FOG_Based Strapdown Inertial Navigation System”

Dzhashitov, V. E.; Панкратов, В. М.; Golikov, A. V.; Nikolaev, S. G.; Kolevatov, A. P.; Plotnikov, A. D.; Koffer, K. V.

doi:10.1134/s207510871502011x

Cited by 3 publications

(2 citation statements)

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“…However, the FOG is sensitive to temperature and environment [44,45], and the residual calibration error will change with time, so the modulation effect of the multiposition stop rotation scheme will decrease. As a simple example, it assumes that the gyro drift has a relationship that changes with time as ε(t) = ε 0 • e −0.001t , where ε 0 = 0.0035 • /h.…”

Section: Design Of Improved Rotational Modulation Schemementioning

confidence: 99%

An Improved Rotational Modulation Scheme for Tri-Axis Rotational Inertial Navigation System (RINS) with Fiber Optic Gyro (FOG)

Wang

Liu

et al. 2023

Applied Sciences

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An optimized scheme can improve the navigation accuracy of RINS without changing the inertial devices. In the multi-position stop scheme, the IMU remains stationary for most of the time, which makes motor control easier. However, the installation errors and the scale factor errors of FOG can cause platform misalignment after a certain angle of rotation around the horizontal axis, resulting in a velocity error. Continuous rotation can suppress time-varying errors better, which is of particular importance for FOG, but it can also increase the sawtooth error of the navigation output, and the error in the direction of rotation cannot be offset. To integrate the advantages of both rotation schemes, we propose an improved rotational modulation scheme for tri-axis RINS. In this scheme, the inner gimbal rotates in a two-position and four-order manner, while the middle and outer gimbals rotate continuously in the order of forward-reverse-reverse-forward. Simulation and navigation test results demonstrate that this improved rotational modulation scheme can effectively improve navigation accuracy by 50% and 25% compared with continuous rotation around the azimuth axis and a 16-position scheme with the same inertial devices, which is of great importance for RINS with FOG.

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Section: Design Of Improved Rotational Modulation Schemementioning

confidence: 99%

An Improved Rotational Modulation Scheme for Tri-Axis Rotational Inertial Navigation System (RINS) with Fiber Optic Gyro (FOG)

Wang

Liu

et al. 2023

Applied Sciences

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“…The commonly used optical gyro is fiber optic gyro (FOG) and laser gyro. FOG is less costly than laser gyro but has a larger scale factor error, is less stable and vulnerable to temperature, magnetic fields and other environmental effects [20,21]. For RINS with FOG, when IMU rotating 180 • around the horizontal axis may excite a great error associated with FOG in a short time [22], which is not conducive to improving navigation accuracy and needs attention in the design process.…”

Section: Introductionmentioning

confidence: 99%

A multi-axis alternating continuous rotation scheme for tri-axis rotational inertial navigation system (RINS) with fiber optic gyro

Lu,

Wang,

Liu

et al. 2023

Meas. Sci. Technol.

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Benefiting from the rotational modulation technique and the gimbal structure, RINS can improve navigation accuracy by about one order of magnitude compared with the strap-down inertial navigation system (SINS). By continuously rotating around a fixed axis, the constant and slow variability errors perpendicular to the direction of the rotation axis can be effectively restrained while the errors in the direction of the rotation axis cannot be suppressed. Therefore, a multi-axis rotation scheme needs to be designed. Meantime, the fiber optic gyro (FOG), as a very popular inertial device, is well suited for RINS but has a larger scale factor error and poorer stability than the laser gyro; thus, it is not suitable to flip the IMU around the horizontal axis too much in the rotation scheme to avoid the rapid accumulation of horizontal misalignment angle. Accordingly, we propose a multi-axis alternating continuous rotation scheme for tri-axis RINS with FOG. During the navigation process, the inner, middle and outer gimbals rotate forward and reverse in sequence. The IMU rotates continuously in the three-axis direction can effectively suppress the effects of constant and slow-varying errors and also avoid the large velocity errors oscillation caused by flipping the IMU. The simulations and navigation tests show that the multi-axis alternating continuous rotation scheme can achieve navigation accuracy comparable to the multi-position rotation scheme and reduce the oscillation of velocity errors, which has important research significance and engineering value for the research of RINS with FOG.

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Analysis and optimization of clutch judder based on a hybrid uncertain model with random and interval variables

Hao

et al. 2018

Engineering Optimization

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The clutch judder has serious impacts on the NVH (noise, vibration and harshness) performance. In this paper, a simplified four-degree-of-freedom dynamic model with nonlinear friction torque and engine torque excitation is developed to simulate the clutch judder, and the stability and dynamic response of the clutch is analyzed based on the simplified model. In addition, the real part of judder modal frequency, the moment when the clutch enters the stick state, and the fluctuation level of the driving part of clutch are treated as the evaluation indexes of the judder performance. An uncertain hybrid model with random and interval variables is used to described the uncertainty of parameters and a hybrid perturbation vertex method is formulated to compute the uncertainty of the clutch judder. Furthermore, the parameters with high sensitivities are used as design variables and the uncertainty-based optimization are conducted to reduce the clutch judder.The optimization results have strongly validated that the proposed method is very effective to improve the robustness of the clutch judder performance.

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Erratum to: “Hierarchical Thermal Models of FOG_Based Strapdown Inertial Navigation System”

Cited by 3 publications

References 0 publications

An Improved Rotational Modulation Scheme for Tri-Axis Rotational Inertial Navigation System (RINS) with Fiber Optic Gyro (FOG)

An Improved Rotational Modulation Scheme for Tri-Axis Rotational Inertial Navigation System (RINS) with Fiber Optic Gyro (FOG)

A multi-axis alternating continuous rotation scheme for tri-axis rotational inertial navigation system (RINS) with fiber optic gyro

Analysis and optimization of clutch judder based on a hybrid uncertain model with random and interval variables

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