Christian Kastl's research while affiliated with Linz Center of Mechatronics GmbH and other places

Publications (23)

Article
Full-text available
In this paper, a novel approach for detecting degradation in internal gear pumps is proposed. In a data-driven approach, pressure reduction time maps (PRTMs) are identified as a useful indicator for degradation detection. A PRTM measures the time for reducing the internal pump pressure from certain levels to any lower level when the pump engine is...
Conference Paper
This contribution proposes using passive thermography to locate concealed defects in the exterior wall insulation of prefabricated houses, which may lead to spots with higher residual moisture. The method can be applied within approx. 3 days after plastering. Its usability is illustrated in several experiments.
Article
This paper introduces a precise radar-based direction-of-arrival measurement system using a Viterbi decoder. Based on the frequency-modulated continuous-wave principle, the presented method employs both the frequency difference and the round-trip phase difference of the radio wave signal impinging at two widely-spaced receiving antennas, thereby ac...
Preprint
Full-text available
A continually growing number of sensors is required for monitoring industrial processes and for continuous data acquisition from industrial plants and devices. The cabling of sensors represent a considerable effort and potential source of error, which can be avoided by using wireless sensor nodes. These wireless sensor nodes form a wireless sensor...
Article
Full-text available
This paper presents the extension of an empirical study in which a universally applicable fault diagnosis method is used to analyse vibration data of bearings measured with accelerometers. The motivation for extending the previously published results was to provide a profound analysis of the proposed approach with regard to a more feasible training...
Article
In this article, a precise phase-based radar distance measurement system using a Viterbi decoder to resolve phase ambiguity is presented. Relying on the frequency-modulated continuous-wave radar principle, the introduced method evaluates both the frequency and the phase of the intermediate frequency signal, thus achieving absolute distance measurem...
Article
The need for accurate positioning and tracking of mobile sensor nodes arises in many applications. To compute position estimates from raw measurements in positioning systems, Bayesian filtering techniques such as Kalman, histogram, or particle filters are frequently employed. A major disadvantage of these techniques is the fact that they compute on...
Chapter
Preface Our future is the world we are going to live in, attracting our fantasies, speculations, fears and hopes. We really would like to know something about it and want to be prepared. Therefore, we observe trends. An obvious trend is that our world gets more and more connected. Information is seamlessly following and doing this quickly. We learn...
Article
The digital world offers ample availability of data, both historic and real-time. While this capability has the potential for better decision making, the contrary can be the case for a human actuator. Information overflow causes mental overload rather than empowerment of choice. In the context of traditional supermarket shopping, for example, custo...
Conference Paper
This paper introduces a 2-D position measurement system for passive UHF RFID tags based on a frequency-stepped continuous-wave approach. The main application is the localization of objects tagged with RFID transponders. Using this method, no system calibration is required, and phase-ambiguity can be avoided by evaluating the backscattered transpond...
Conference Paper
This paper presents an empirical study in which universally applicable fault diagnosis methods are used to evaluate vibration data of bearings. The data were acquired on two different test beds: a gear box test bed containing various bearings at different health states, and an accelerated life time (ALT) test bed to degrade a bearing and introduce...

Citations

... Several articles have reported the construction of physical control systems testbeds to provide a cyber threats research platform [3,13,17,18,19,20,21,22,12]. To the best of our knowledge, two comprehensive surveys [15,16] provide an extensive analysis of various testbeds for ICS. ...
... Some authors attempt to increase this accuracy. For example, Rudic [110] propose an iterative search using a Markov model to reduce the location uncertainty. Urano [111] relies instead on a LSTM to keep track of the device movement and model the best likely trajectory. ...
... The authors in [103] tried to address the problem of personalized gesture recognition for cyber-physical environments, proposing an eventdriven service-oriented framework. While in other gesture recognition applications, a body-worn setup was proposed, which supplements the omnipresent 3 DoF motion sensors with a set of ultrasound transceivers [104]. ...
... In the experimental results, an almost unchanged lag in frame was obtained with a mean value ofΔk = 114.7 frames and a standard deviation of 0.65 frames. According to (5), this yields an average target velocity orthogonal to the radar beams of IV. CONCLUSION We have presented a velocity measurement system relying on a two-dimensional cross-correlation of radar signals. ...
... HMM has also been used in [12] to deal with highly uncertain target motions and fusion with uncertain sensor models on the road network-based target tracking. The effectiveness of HMM framework to incorporate geometric information such as barriers or boundaries into the localization problem has been demonstrated in [14]. ...
... However, the physical interpretability applies also to PRTMV. In (Pichler, Haas, Putz, & Kastl, 2020) we also compared PHS to another commonly used approach, namely head flow diagrams (HFD). The results showed that PHS and HFD perform quite similar. ...
... Moreover, this approach didn't implement digital key and digital fingerprints. Hormann et al. [35] proposed a concept based on lifetime security for industrial wireless sensor networks. Supply current, time, packets and time slots were the simulation metrics utilized for evaluation. ...
... Figure 15 shows examples of the probability plot based-images for bearing vibration signals with the normal condition and inner race fault from the data described in Section 2.1.1. The application of the probability plot in machine fault diagnosis has been considered in several studies [63][64][65][66][67][68]. In [63], the probability plots constructed from bearing vibration signals collected under constant and variable speed conditions were used as input images in the absolute value PCA for bearing fault diagnosis. ...
... which can be efficiently computed utilizing a dynamic programming method called the Viterbi algorithm [46,47] as presented in Appendix A. The obtained time-delay difference estimates are denoted as ∆τ m = i * m,1 , i * m,2 , · · · , i * m,T . ...
... [13] used a grid map representation with a few overlaid graph. In [19]- [21], continuousstate based Viterbi algorithm as an alternative approach is proposed instead of discrete-state. However, computational issues are still remained in [19], [20]. ...