The Definition and Working Principle of DTG

The dynamically-tuned gyroscope is a gyroscope supported by a flexible joint composed of two pairs of orthogonal torsion bar and balance ring frame. By using the negative elastic moment generated by the dynamic effect, the positive elastic moment of the elastic torsion bar is offset, so that the rotor is in the free rotor state without the action of torque, and the precision of the gyroscope is improved.

Gyro is one of the basic measuring elements of inertial navigation and inertial guidance systems. Dynamically Tuned Gyro (DTG) is a non-liquid floating, dry elastic support, electromechanical flexible gyro. As a mature rigid-body rotor gyro, its accuracy range is between 0.01°/h~1°/h. Dynamically-tuned gyroscope, also known as dynamic gyro, has the advantages of simple structure, small size, light weight, low cost, etc. It is widely used in aviation, marine, missile, spacecraft, guidance and navigation systems, oilfield exploration and development, military and civilian applications.

The DTG refers to a gyroscope supported by a flexible joint consisting of two pairs of orthogonal torsion bars and a balance ring frame through a gyro rotor. By using the negative elastic moment generated by the dynamic effect, the positive elastic moment of the elastic torsion bar is cancelled out, so that the rotor is in a free-rotor state without a moment and the precision of the gyroscope is improved.

Basic working principle

The rotor is connected with the balance ring through an external torsion bar, and the balance ring is connected with the motor shaft through an internal torsion bar. The internal and external torsion bar has a large flexural rigidity and a small torsional rigidity, so the motor's driving torque can be passed to the gyroscope through the internal and external torsion bar, and the rotor can be rotated around the internal and external torsion bar axis, and has two degrees of freedom of rotation in the equatorial plane, so the dynamically-tuned gyroscope is a two-degree-of-freedom gyroscope.

Application

At present, it has been used in surface and land strapdown, fast north finder, TV antenna tracker, and widely used in space strapdown inertial navigation system, and can also be used in high dynamic carrier attitude system. The dynamically-tuned gyroscope can be used for strapdown and platform attitude systems of ground, sea, aviation and space vehicles.

Dynamically-tuned gyroscopes offer comprehensive advantages in terms of accuracy, reliability, miniaturization, longevity and cost. At present, it has been widely used in various inertial systems, such as the high-precision platform of the Long March series carrier rocket, which is used as the inertial reference of the rocket and the equipment and components for measuring the attitude and motion parameters of the rocket. As a low-cost, miniaturized flexible strapdown inertial navigation device, it is applied in the mid-low speed strapdown system of Fengyun satellite attitude control and various tactical missiles, guided bombs and unmanned aircraft. As the navigation and positioning equipment of Marine ships or land vehicles, it is used in the gyro compass of ships and land north finder; Or used in oil field development and exploration, for oil well track remeasurement, drilling orientation, etc.

In the drilling field, inertial devices are used more than in the flight field, In the technical requirements are higher, the product is more adaptable, because of its bad working conditions, high ambient temperature, the temperature adaptation and life requirements are very demanding, specially designed for the logging of the case and the development of higher precision dynamic tuning gyroscope, to overcome the above technical difficulties, its working temperature can reach 100℃.

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