Measurement of cutting tool wear is critical in metal cutting operations. In automated manufacturing, sensing of tool wear is of interest. In single point cutting tools, wear parameters are expressed in terms of wear land width and crater depth, which may not be the ideal or effective parameters to explain the wear related phenomenon in metal cutting. This paper deals with the measurement of wear by considering the three dimensional nature of the wear phenomenon. For this a special relocating fixture was designed and realized and the land and crater wear profiles were plotted in a single setup. From these profiles it was possible to compute other parameters, which could be used for wear quantification. For sensing tool wear, a pneumatic method of wear monitoring has been attempted. This paper gives the details of the measurement set-ups, measurement procedures, new parameter evaluation and their relationship with standard parameters as well as other wear related effects in metal cutting.

The defects of flexible element (belt) have been modeled in this work. The dependency of bearing housing vibration velocity of dynamic test bench has been got. It is defined that the quantity of defects influences the parameters of the vibration of mechanical system.

The misfire detection plays an essential role for the on-board diagnosis of sparc ignition engines and is prescribed by law in the United States of America since 1989 (OBDII). According to the last revised edition from 1996, the misfire detection rate must equal 100 percent for the 2002 model year under all operating conditions relating to speed and torque. Actual methods for misfire detection in sparc ignition engines base on measuring speed fluctuations. But they don't work reliably even at high speed and low torque. Hence this paper describes a new approach which consists of measuring the vibration at the cylinder walls. The composition of the knock sensor signal is introduced and classified in several elementary parts. All of them carry information about the state of combustion. A new polynomial based signal element decomposition method is proposed to extract features for the misfire detection. Results are given using real knock sensor signals.

In order to detect short-circuits in low-voltage systems, a system was developed with several digital signal processors. The processors are housed on a DSP board, which is based on the VXIbus, and connected to one another by numerous communications pathways. These communications pathways allow for a high degree of flexibility and scalability. They are used to map the algorithmic structure on to the system. The system includes an interface board, which preprocesses, segments and distributes the data coming from the analogue-digital converters to the DSPs. This board generates a pulse with the segments, which determines the subsequent signal processing. As a result of the segmentation of the data flow, the 50 Hz fundamental wave of the voltage system also remains in the segments as a disruptive DC component, and as an approximately saw-toothed signal component after its elimination. Methods are presented by which these interference signal components can be eliminated using non-linear filtering

The newly developed monitor watches the fluidized condition of FBC (Fluidized Bed Combustor), referring to acoustic signals which are collected by heating tubes in the beds and passing to tube acceleration sensors outside the fluidized Beds. The monitor, without any observation hole or special probes, not only detects the bad-fluidized region, which requires proper operations for preventing from agglomeration, but also diagnoses conditions of the boiler equipment. The monitor adopts the joint time-frequency analysis technique to the acoustic signals as well as considers non-Gaussian properties, on decision making procedure, including skewness and excess of parameter distributions which are the resulting characteristics through the analyses on the time-frequency plain. The monitor has been applied to an 350 MWe FBC for testing, and validated through one and a half year operation.