Spurious Signals in the Thermal MEMS Gyroscope

The operational principle of a thermal MEMS (Micro Electro-Mechanical Systems) gyroscope was reported in Hilton Head 2010 [1]. In the current work we describe two factors that can produce a spurious rotation signal in gyroscopes of this type. These factors are, firstly, distortion or asymmetric placement of the heating elements or temperature sensors; secondly, the effects of linear acceleration and/or gravity on the fluid flow inside the device, and hence on the gyroscope output. In order to simulate the thermal gyro and the origin of these spurious signals, a mathematical model is built and developed through the COMSOL CFD package. The spurious signals predicted by this simulation are shown to correspond to experimental measurements. Alternative cavity shapes are investigated and simulated as a mean of suppressing the spurious signal.

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Technology For Elimination of MEMS Gyroscope Zero Offset under the Influence of Linear Acceleration and the Occurrence of Skewnesses in the Locations of Sensor Block Installation

2020 27th Saint Petersburg International Conference on Integrated Navigation Systems (ICINS) ◽

10.23919/icins43215.2020.9133905 ◽

2020 ◽

Author(s):

Aleksey Krylov

Keyword(s):

Linear Acceleration ◽

Mems Gyroscope ◽

Zero Offset ◽

Sensor Block

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Mathematical model of the hydrocyclone based on physics of fluid flow

AIChE Journal ◽

10.1002/aic.690370511 ◽

1991 ◽

Vol 37 (5) ◽

pp. 735-746 ◽

Cited By ~ 141

Author(s):

K. T. Hsieh ◽

R. K. Rajamani

Keyword(s):

Mathematical Model ◽

Fluid Flow

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The Mechanics of Ozone Cracking

Rubber Chemistry and Technology ◽

10.5254/1.3539891 ◽

1962 ◽

Vol 35 (1) ◽

pp. 200-209 ◽

Cited By ~ 8

Author(s):

M. Braden ◽

A. N. Gent

Keyword(s):

Tensile Stress ◽

Crack Growth ◽

Energy Requirement ◽

Critical Energy ◽

Critical Value ◽

Experimental Measurements ◽

Rubber Sheet ◽

Polymer Molecules ◽

Two Factors ◽

Applied Tensile Stress

Abstract Experimental measurements are described of the growth of a cut in a stretched rubber sheet under the action of an atmosphere containing ozone. A well-defined rate of crack growth is obtained, substantially independent of the applied tensile stress when this exceeds a critical value necessary for growth to occur at all. The rate of growth is found to be similar for a number of polymers and principally determined by the ozone concentration when the mobility of the polymer molecules is sufficiently high. When the molecular mobility is inadequate, crack growth is retarded. The critical condition is found to be similar for all the polymers examined, and largely independent of the conditions of exposure; it appears to reflect an energy requirement for growth of about 40 ergs/cm2 of newly-formed surface. The effect of the degree of vulcanization and the presence of additives, including antiozonants, on these two factors has also been examined. The dialkyl-p-phenylene diamines are found to confer protection by raising the critical energy required for growth to occur, in contrast to other protective agents which affect only the rate of crack propagation.

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A one-dimensional mathematical model of multi-component fluid flow in pipes and its application to rapid decompression in dry natural gas mixtures

International Journal of Pressure Vessels and Piping ◽

10.1016/j.ijpvp.2013.01.003 ◽

2013 ◽

Vol 104 ◽

pp. 30-36 ◽

Cited By ~ 5

Author(s):

Evgeniy Burlutskiy

Keyword(s):

Mathematical Model ◽

Fluid Flow ◽

Natural Gas ◽

Gas Mixtures ◽

One Dimensional ◽

Rapid Decompression

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PORFLO-3: A mathematical model for fluid flow, heat, and mass transport in variably saturated geologic media; Theory and numerical methods, Version 1.0

10.2172/137710 ◽

1990 ◽

Author(s):

B Sagar ◽

A Runchal

Keyword(s):

Mathematical Model ◽

Fluid Flow ◽

Numerical Methods ◽

Mass Transport ◽

Media Theory ◽

Heat And Mass Transport ◽

Flow Heat ◽

Geologic Media

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Thickness Deformation of Constrained Layer Damping: An Experimental and Theoretical Evaluation

Journal of Vibration and Acoustics ◽

10.1115/1.1340625 ◽

2000 ◽

Vol 123 (2) ◽

pp. 213-221 ◽

Cited By ~ 9

Author(s):

Peter Y. H. Huang ◽

Per G. Reinhall ◽

I. Y. Shen ◽

Jessica M. Yellin

Keyword(s):

Mathematical Model ◽

Transfer Functions ◽

Viscoelastic Layer ◽

Experimental Setup ◽

Experimental Measurements ◽

Constrained Layer Damping ◽

Response Functions ◽

Theoretical Evaluation ◽

Calculated Frequency ◽

Direct Measurements

This paper presents a study of thickness deformation of the viscoelastic material in constrained layer damping (CLD) treatments. The first goal of the study is to demonstrate the feasibility of using direct measurement to investigate thickness deformation in CLD treatments. The experimental setup consisted of a constrained layer beam cantilevered to a shaker, an accelerometer mounted at the cantilevered end, and two laser vibrometers that simultaneously measured the responses of the base beam and the constraining layer, respectively, at the free end. A spectrum analyzer calculated frequency response functions (FRFs) between the accelerometer inputs and the vibrometer outputs. Measured FRFs of the base beam and the constraining layer were compared to detect thickness deformation. Experimental results showed that direct measurements can detect thickness deformation as low as 0.5 percent. The second goal is to evaluate the accuracy of a mathematical model developed by Miles and Reinhall [7] that accounts for thickness deformation. FRFs were calculated by using the method of distributed transfer functions by Yang and Tan [13]. Comparison of the numerical results with the experimental measurements indicated that consideration of thickness deformation can improve the accuracy of existing constrained layer damping models when the viscoelastic layer is thick.

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