Abstract
This paper proposes a distributed system for analysis and monitoring (DSAM) of vibrations and acoustic noise, which consists of an array of intelligent modules, sensor modules, communication bus and a host PC acting as data center. The main advantages of the DSAM are its modularity, scalability, and flexibility for use of different type of sensors/transducers, with analog or digital outputs, and for signals of different nature. Its final cost is also significantly lower than other available commercial solutions. The system is reconfigurable, can operate either with synchronous or asynchronous modes, with programmable sampling frequencies, 8-bit or 12-bit resolution and a memory buffer of 15 kbyte. It allows real-time data-acquisition for signals of different nature, in applications that require a large number of sensors, thus it is suited for monitoring of vibrations in Linear Switched Reluctance Actuators (LSRAs). The acquired data allows the full characterization of the LSRA in terms of its response to vibrations of structural origins, and the vibrations and acoustic noise emitted under normal operation. The DSAM can also be used for electrical machine condition monitoring, machine fault diagnosis, structural characterization and monitoring, among other applications.
Highlights
The control and reduction of acoustic noise is a wide reaching and public matter which involves health issues and comfort parameters
As a consequence a large number of sensors are needed for the characterization of Linear Switched Reluctance Actuators (LSRAs), and localized analysis tools are required for time-frequency or space-frequency analysis, such as the discrete wavelet transform (DWT) [6,7]
To characterize the LSRA in terms of vibration and acoustic noise produced in normal operation, a distributed system for analysis and monitoring (DSAM) was developed, based on intelligent sensor (IS) modules, which are connected to accelerometers and placed in different mechanical parts along the structure of the LSRA
Summary
The control and reduction of acoustic noise is a wide reaching and public matter which involves health issues and comfort parameters. One can look at the design of linear switched reluctance machines as the linearization of SRM, there are some differences, such as: the phase windings can be either at the stator or at the translator, typically they are associated to the translator; the movement is linear and normally longitudinal and not periodic; the number of teeth of the moving part depends on the dimensions of the actuator, namely its length. It has three phase windings at the translator, a length of 2.0 m, 0.5 m depth and is mainly built with aluminium frame profiles, except for the secondary and other magnetic circuit parts, which are of ferromagnetic steel, and the knobs and feet (plastic and rubber). As a consequence a large number of sensors are needed for the characterization of LSRA, and localized analysis tools are required for time-frequency or space-frequency analysis, such as the discrete wavelet transform (DWT) [6,7]
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