A new sonar target tracking system is presented that is capable of accurately tracking targets at measurement rates exceeding 10 Hz. Two sonar trackers, each consisting of a transmitter and two receivers, are independently controlled to track sonar targets from bearing and range measurements. Bearing and range are accurately estimated using matched filters on two closely spaced receivers, with ...

.Abstract – The goal of this research was to evaluate the potential of homopolar electrodynamic magnetic bearings for flywheel energy storage systems (FESSs). The primary target was a FESS for Low Earth Orbit (LEO) satellites, however, the design can also be easily adapted for Earth-based applications. The main advantages of Homopolar Electrodynamic Bearings compared to more conventional Active...

A fundamentally precise and simple linear motion axis design is presented where the attractive force from the linear motor is used to preload an air-bearing supported carriage that moves on two intersecting perpendicular planes. These two planes represent the most accurate and lowest cost geometry that can be created to guide linear motion. By placing the motor at a desired position and angle w...

Air-lubricated foil bearings are used in a variety of applications such as turbomachinery, journal bearings, dentistry equipment, etc. [1–3]. One of the most intricate applications of air-lubricated foil bearings can be found in magnetic tape drives [4], where a magnetic tape moves over a read/write head and tape drive components such as guides (stationary) and rollers (rotating). Friction is a...

Recent advances in the techniques of manufacture of vital parts, such as rotors and bearings, have enabled improvements to be made to screw compressors, which were difficult to imagine only a few years ago. This has inevitably influenced the prospects for these machines in refrigeration and air conditioning applications. Some aspects of this are presented, together with well known but not alway...

A signal processing technique is presented by which the position of a rotor supported in magnetic bearings may be deduced from the bearing current waveform. The bearing currents are presumed to be developed with a two state switching amplifier which produces a substantial high frequency switching ripple. This ripple is demodulated using a model reference parameter estimation technique which ext...

This paper reports on the development of a high-speed electrical machine which can be used as motor or generator for application in micro heat engines. The machine has a rated power of 200 W at a rotational speed of 600 000 rpm and is supported by self-acting air bearings. The design process outlined in the paper focuses on aspects such as electromagnetic design, bearing design, rotordynamic be...