Coursework - Hydrovertical

Contents

INTRODUCTION

1 THEORETICAL PART

1.1 Review of Scientific Technical and Patent Literature

1.2 Description of design and principle of action

1.3 Gyruertical equations of motion

2 DESIGN PART

2.1 Selection of hydraulic motor type

2.2 Overall dimensions

2.3 Calculation of mass and moment of inertia of rotating parts

2.4Compute maximum moment

2.5 Determination of main parameters of gyromotor

2.6 Induction in air gap

2.7 Stator Winding Data

2.8 Magnetic circuit calculation

2.9 Replacement scheme parameters

2.10 Mechanical characteristic

2.11 Clarification of kinetic moment. Calculation of run-off time

Conclusion

List of literature used

Application

Introduction

Gyroscopic verticals (gyroerticals) are designed to determine the direction of the true vertical on moving objects. Being one of the devices of the mobile object orientation system, they are used as sensors of aircraft crepe and pitch angles (or sensors of similar angles of other moving objects) and serve to create a platform stabilized in the horizon plane on the moving object.

Electrical signals taken from the measuring axes of the device are used in aerobatic, navigation, radar systems, visual indicators, etc.

Gyroscopic devices used directly to visually determine the position of the aircraft relative to the horizon plane are called air horizons. On a fixed base relative to the Earth, the direction of the true vertical can be determined, for example, using a short-period physical pendulum or level. However, the arm of the short period pendulum mounted on the moving object deviates towards the direction of the apparent vertical.

With some evolutions of the aircraft (superelevation, loop), the errors of such a pendulum can practically reach several tens of degrees or more. Therefore, it is not suitable for directly determining and specifying the direction of the true vertical.

Unlike the pendulum, the astatic gyroscope is less susceptible to accelerations and keeps the direction of the main axis in inertial space unchanged. If the main axis of the astatic gyroscope is set in the direction of the true vertical, then over time it will deviate from the vertical due to the daily rotation of the Earth and the movement of the object relative to it. In addition, the gyroscope is not free of moments of resistance in the axes of the suspension, which cause its precession from the original position. Such a gyroscope can only be used as a gyroertikal for a limited time. To give it selectivity to the direction of the true vertical, a physical pendulum is used, which either directly acts on the gyroscope due to the displacement of the center of mass of the latter (gyroscope), or is used as a sensitive element controlling the precession of the gyroscope and correcting it.

Gyroverticals combining an astatic gyroscope with a correction from a pendulum sensitive element make it possible to create a dynamic system that has pendulum selectivity and gyroscope precession integrity, which is quite low-frequency, and, therefore, less susceptible to short-term or fast-changing accelerations than a physical pendulum used separately. Such gyrovertikali construction schemes are widespread

Conclusion

In this course work, the gyroscopic vertical was studied, the main parameters of the gyromotor used in it were calculated. As a result of the calculations, the following was obtained: Moment of inertia J _ m = 4657 gsm ^ 2; Maximum moment 〖 M 〗 _ M = 1.27 Nsm; value of reduced air gap δ ^ = 0.0234 cm; sliding 〖 S 〗 _ N =0.0213; Run time t _ p = 156 s.

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