The Triaxial Angular Rate Measurement System Based on Two MEMS Accelerometers Used for Rotating Carrier

2014 ◽  
Vol 609-610 ◽  
pp. 1219-1225
Author(s):  
Xiao Ming Zhang ◽  
Dai Di Zhao ◽  
Jian Yu Shang ◽  
Xing Cui ◽  
Jun Liu
Keyword(s):  
Measurement System ◽  
Measurement Accuracy ◽  
Physical Simulation ◽  
Angular Rate ◽  
Measurement Range ◽  
Small Range ◽  
Rate Measurement ◽  
Mechanics Model ◽  
Mems Accelerometers ◽  
Large Measurement

Considering that the MEMS Gyroscope used in rotating carrier has the problems of small range and low measurement accuracy, the tri-axial angular rate measurement system based on two MEMS accelerometers used for rotating carrier was presented in this paper. The system has the advantages of large measurement range, anti-high overload, simple structure, small volume and low price. From the principle of the tri-axial angular rate measurement system, the mathematical model of the system was established and the mechanics model of the system was discussed. The different processing method of the output signal in each condition was summarized based on the mechanics model. Finally, the semi-physical simulation experiment was done to verify these theories. The experimental results show that the system scheme is feasible and has obvious advantages in the range and measurement accuracy.

scholarly journals Performance Enhancement Method for Angular Rate Measurement Based on Redundant MEMS IMUs

Micromachines ◽  
2019 ◽  
Vol 10 (8) ◽  
pp. 514 ◽  
Author(s):  
Li Xing ◽  
Xiaowei Tu ◽  
Weixing Qian ◽  
Zhi Chen ◽  
Qinghua Yang
Keyword(s):  
Performance Enhancement ◽  
Low Cost ◽  
Angular Rate ◽  
Measurement Data ◽  
Measurement Range ◽  
Measurement Unit ◽  
Small Range ◽  
Rate Measurement ◽  
Wide Range ◽  
Mems Gyroscopes

Aiming at the low-cost, wide-range, and accurate measurement requirement for Microelectromechanical System (MEMS) Inertial Measurement Unit (IMU) on a multi-rotor Unmanned Aerial Vehicle (UAV), the paper designs a heterogeneous parallel redundancy configuration scheme. In redundant MEMS IMUs, a high-cost and small-range MEMS gyroscope is combined with low-cost and large-range MEMS gyroscopes. Then, an adaptive data fusion method of redundant MEMS gyroscopes is proposed. By the designed experiments based on the simulation data and the sensor measurement data, the proposed method has been proved that it can effectively improve the angular rate measurement performance of the multi-rotor UAV and broaden the angular rate measurement range on the basis of saving the configuration cost and volume of the micro IMU.

Articulated Arm Length Calibration for Cantilever Coordinate Measuring Machine

2013 ◽  
Vol 333-335 ◽  
pp. 77-80 ◽  
Author(s):  
Hong Lei Ran ◽  
Shu Gui Liu ◽  
Hai Tao Zhang
Keyword(s):  
Measurement Accuracy ◽  
Small Volume ◽  
Low Cost ◽  
Coordinate Measuring Machine ◽  
Calibration Method ◽  
Measurement Range ◽  
Precision Error ◽  
Large Measurement ◽  
Measuring Machine ◽  
Error Calibration

Cantilever CMM(short for coordinate measuring machine) is non-orthogonal type one with large measurement range, small volume, light weight, low cost, but lower precision. Error calibration and compensation is an important way to improve the measurement accuracy. This paper presents a new calibration method for the length of articulated arm just using the square. Facility requirement is relatively low and it is easy to operate. Comparing with that measured by laser interferometer, this method has a relatively high accuracy, having a certain value in practical measurement.

scholarly journals Displacement Measurement Method Based on the Rotating Paraboloid Array

2019 ◽  
Vol 9 (16) ◽  
pp. 3315
Author(s):  
Zekui Lv ◽  
Zhikun Su ◽  
Dong Zhang ◽  
Zhiming Yang ◽  
Xiaohuan Yang ◽  
...  
Keyword(s):  
Measurement System ◽  
Measurement Accuracy ◽  
Measurement Range ◽  
Displacement Measurement ◽  
Freeform Surface ◽  
Research Focus ◽  
Potential Applicability ◽  
Discrete Manner ◽  
Straightness Error ◽  
Optical Structure

Using an optical freeform surface to realize the precision measurement of displacement has become a research focus in the present day. However, the measurement range of this method is limited by the size of the freeform surface processed. In order to overcome this difficulty, this paper presents a two-dimensional displacement measurement system with a large range, which is composed of a slope sensor and a rotating paraboloid array. The slope sensor utilizes the optical structure of an autocollimator with minor optimization, and the rotating paraboloid array expands the measurement range of the system in a discrete manner. The experimental results showed that the optimized optical system enhanced the measurement accuracy to ±0.4 μm within the range of 1500 μm and the overall measurement error was approximately ±2 μm when measured within the range of 450 mm. The developed measurement system has potential applicability for detection of errors, such as the position error and straightness error of multi-axis systems.

The Measurement Correction of MEMS Gyroscope Based Interlaced Kalman Filtering

2011 ◽  
Vol 301-303 ◽  
pp. 1083-1088
Author(s):  
Jun Jie Lu ◽  
Jun Zhou ◽  
Xiao Dong Lu ◽  
Xiao Jun Liu
Keyword(s):  
Kalman Filtering ◽  
Attitude Change ◽  
Physical Simulation ◽  
Angular Rate ◽  
State Equation ◽  
Rate Measurement ◽  
Computation Complexity ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Mems Gyroscope

To correct the angular rate measurement error of MEMS gyroscopes for tactical missile, this paper proposes use of dynamics correspondence between the rudder control torque and the missile body attitude to build the state equation of system, which is more realistic and precise than the description for the actual missile attitude change with low-pass filter. In order to avoid errors in the linearization for nonlinear equations and reduce the filtering computation complexity, the Interlaced Kalman Filtering is applied to achieve the pseudo-linear state equation with coupling terms, which effectively reduce the computation complexity. Finally, the semi-physical simulation with the three-axis MEMS IMU and Electro-Servo verified that the algorithm significantly improved the angular rate measurement accuracy of the low-precision MEMS gyroscope.

Three-Dimensional Measurement System Based on Line Laser

2013 ◽  
Vol 333-335 ◽  
pp. 32-36
Author(s):  
Le Wen Yu ◽  
Da Zhang ◽  
Yuan Sheng Zhang
Keyword(s):  
Mathematical Model ◽  
Measurement System ◽  
Measurement Accuracy ◽  
Three Dimensional ◽  
Measurement Range ◽  
Laser Triangulation ◽  
Depth Information ◽  
Dimensional Measurement ◽  
Three Dimensional Measurement ◽  
On Line

This paper puts forward a three-dimensional measurement system based on line laser, describing its operating principle. Extracted the light stripes center by image processing technology, and establishing mathematical model, detecting the depth information by the method of laser triangulation, and reconstructed the three-dimensional form of object. The experimental results indicate that measurement accuracy less than ±0.03mm when the measurement range between 0mm to 10mm.

Invariant method for measuring wet gas flow rate

2021 ◽  
pp. 13-19
Author(s):  
Zhanat А. Dayev ◽  
Gulzhan E. Shopanova ◽  
Bakytgul А. Toksanbaeva
Keyword(s):  
Flow Rate ◽  
Measurement System ◽  
Flow Measurement ◽  
Gas Flow ◽  
Test Results ◽  
Invariant System ◽  
Rate Measurement ◽  
Gas Flow Rate ◽  
Flow Rate Measurement ◽  
Wet Gas

The article deals with one of the important tasks of modern flow measurement, which is related to the measurement of the flow rate and the amount of wet gas. This task becomes especially important when it becomes necessary to obtain information about the separate amount of the dry part of the gas that is contained in the form of a mixture in the wet gas stream. The paper presents the principle of operation and structure of the invariant system for measuring the flow rate of wet gas, which is based on the combined use of differential pressure flowmeters and Coriolis flowmeters. The operation of the invariant wet gas flow rate measurement system is based on the simultaneous application of the multichannel principle and the partial flow measurement method. Coriolis flowmeters and the differential pressure flowmeter are used as the main elements of the system. The proposed measurement system does not offer applications for gases with abundant drip humidity. The article provides information about the test results of the proposed invariant system. The estimation of the metrological characteristics of the invariant system when measuring the flow rate of wet gas is given. The obtained test results of the invariant wet gas flow rate measurement system are relevant for natural gas production, transportation, and storage facilities.

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