Quan Gang Yu

Study on Nozzle Array Structure Fluidic Gyroscope

This paper reports about a nozzle array structure fluidic gyroscope. The gyro used setting sub-nozzle around the main nozzle to inhibit the attenuation which had been caused by the main nozzle jet column spread out and to increase the angular velocity difference of sensitive element in the thermal resistance wire when the jet flow rate had been input, thereby to improve the performance of the jet gyro. The test results showed that: a resolution of better than 0.1°/s nozzle formation jet gyro sensitivity better than 10mv/(0.1°/s), the measurement range is better than ± 60°/s; non-linearity of better than 1%.The impact of the gyroscope impact resistance capability, small size and wide range of applications.

Study on Improving Resolution of Fluidic Gyroscope

This paper presents a comparative study to improve the resolution of the fluidic gyro. Using ANSYS-FLOTRAN-CFD software, the finite element simulation has been conducted by series of procedures, such as model building, meshing, loads applying and equation solving, the flow distribution in the sensitive element of the single nozzle and nozzle array fluidic gyro was calculated separately. The results show that the air outlet flow gradient of the array type nozzle increases by 1.1%, the flow velocity difference of symmetrically heat resistance wires in sensitive element increases by 14.3%; the nozzle array structure can effectively improve the resolution of the fluidic gyroscope.

Research on Nozzle Array Structure Fluidic Gyroscope Zero Temperature Compensation

The nozzle array structure fluidic gyroscope’s zero temperature compensation was researched. The fluidic gyroscope’s temperature characteristic was analyzed in the sensitive element and two zero temperature compensation methods were compared. Then, the software compensation method was used, which based on the Single chip microcomputer technology and realized temperature compensation for the gyroscope output signal. The results show that after the compensation, the gyroscope’s zero drift decreases from ≤1.3mV/°C to ≤0.1mV/°C and operating temperature range increases from normal temperature to -40°C~+60°C. Therefore, the fluidic gyroscope has the advantage of low zero drift and width operating temperature range after the zero temperature compensation, which provides the convenience for the production and application.

Research on Nozzle Array Structure Fluidic Gyroscope Signal Compensation Circuit

The nozzle array structure fluidic gyroscope signal compensation circuit was researched. To compensate output voltage signal from the first stage of the gyroscope angular rate sensitive element, which had the perfect linearity and operating temperature range, the signal compensation circuit was designed. Then, the circuit function and principle for each module was analyzed. The signal compensation circuit is composed up Single chip microcomputer, temperature sensor, voltage regulator circuit and peripheral circuit. The experiment results shows that using the signal compensation circuit, the fluidic gyroscope linearity is 1% and operating temperature range is -60°C~+60°C. Therefore, the signal compensation circuit realizes the voltage signal temperature compensation and eliminates noise jamming from the external environment, which provides the foundation for the fluidic gyroscope production and application.

Research on Nozzle Array Structure Fluidic Gyroscope Sensitivity-Temperature Compensation

The nozzle array structure fluidic gyroscope sensitivity-temperature compensation was researched. The fluidic gyroscope’s sensitivity temperature characteristic was analyzed in the sensitive element and two sensitivity-temperature compensation methods were compared. Then, the software compensation method was used, which based on the Single chip microcomputer technology and realized sensitivity compensation for the gyroscope output signal. The results show that after the compensation, the gyroscope’s sensitivity-temperature coefficient decreases from 1.8mV/°/s/°C to 0.1mV/°/s/°C and operating temperature range increases from normal temperature to -40°C～+60°C. Therefore, this method provides the effective way for the gyroscope practical research.

Research on Fluidic Gyroscope Signal Processing Circuit

The fluidic gyroscope signal processing circuit was researched. This paper aims at the circuit problem for lots of electronic components and output signal instability, the adjustable voltage regulator circuit was used and realized the different voltage signal output, the stabilivolt and voltage follower were used and realized the temperature compensation for the voltage signal. The experiment results show that compared with the existing voltage regulator circuit, the PCB area reduces 16% and output signal’s temperature drift decreases 10% in the improved voltage circuit. This signal processing circuit is easy to apply and available for the others gyroscopes, whose repeatability precision is enough high.

Research on Nozzle Array Structure Fluidic Gyroscope Sensitive Principle

The fluidic gyroscope sensitive principle with nozzle array structure was researched. Using the finite element method, according to the actual size, building an entity model, the finite element simulation was conducted by a series of procedures, such as meshing, loads applying and solving. Then the cavity flow field distribution was calculated in the different input angular rate. The results are as follows: In static status, airflow velocity shows a symmetry distribution through central axis of enclosure, the two hotwires endure the same current rate and current, then the bridge outputs zero. In the angular rate inputs, airflow velocity shows an asymmetry distribution through central axis of cavity. The two hotwires endure the different current rate, both of the hotwires current are changed with angular rate, then the bridge outputs a voltage with corresponding with the angular rate. The fluidic gyroscope sensitive principle with nozzle array structure is revealed by finite element method, which provides the foundation for the fluidic gyroscope structural and performance improvement.

New Ways of Improving the Property of the Piezoelectric Fluidic Angular Rate Sensor

New ways of improving the property of the piezoelectric fluidic angular rate sensor are described in the paper. According to the improved schemes of the structure and the process, the repeatability of null voltage, the cross-coupling and stability of the sensor are improved. The numerical results have shown that the repeatability of null voltage increases from 0.2°/S to 0.1°/S and the cross-coupling decreases from 2% to 1%.

FEM Analysis of the Pendulum Characteristic of Nature Convection in Dimensional Enclosure

In this paper, the pendulum characteristic of nature convection gas in dimensional enclosure is analyzed by FEM. Using ANSYS-FLOTRAN CFD program, the stream field and the temperature field caused by the point heat source, when the two-dimensional enclosure is inclined, has been obtained by a series of procedure, such as model building, meshing, loads applying and equation solving. The results are as follow: (1)Under the buoyancy lift affecting, the direction of nature convection gas always keeps the vertical upward in two-dimensional enclosure, nature convection gas has the pendulum characteristic. (2)When the dimensional enclosure is inclined, temperature distribution at the several points in dimensional enclosure will change with the tilt angle. The pendulum characteristic can be utilized to measure the tilt angle by the gas pendulum tilt sensor.

Study on the Pendulum Characteristic of Nature Convection in Dimensional Enclosure

In this paper, the pendulum characteristic of nature convection gas in dimensional enclosure is analyzed by FEM. Using ANSYS-FLOTRAN CFD program, the stream field and the temperature field caused by the point heat source, when the two-dimensional enclosure is inclined, has been obtained by a series of procedure, such as model building, meshing, loads applying and equation solving. The results are as follow: (1)Under the buoyancy lift affecting, the direction of nature convection gas always keeps the vertical upward in two-dimensional enclosure, nature convection gas has the pendulum characteristic. (2)When the dimensional enclosure is inclined, temperature distribution at the several points in dimensional enclosure will change with the tilt angle. The pendulum characteristic can be utilized to measure the tilt angle by the gas pendulum tilt sensor.