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All Journal Journal of Engineering and Technological Sciences Jurnal Riset Multidisiplin dan Inovasi Teknologi
Yohannes S.M. Simamora
Mechanical Engineering Study Program, Politeknik Purbaya, Tegal
Agriculture, Biological Sciences & Forestry Economics, Econometrics & Finance Engineering Languange, Linguistic, Communication & Media Social Sciences

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On Active Surge Control of Compression Systems via Characteristic Linearization and Model Nonlinearity Cancellation Simamora, Yohannes S.M.; Tjokronegoro, Harijono A.; Leksono, Edi
Journal of Engineering and Technological Sciences Vol 46, No 3 (2014)
Publisher : ITB Journal Publisher, LPPM ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1139.257 KB) | DOI: 10.5614/j.eng.technol.sci.2014.46.3.8

Abstract

A simple approach of active surge control of compression systems is presented. Specifically, nonlinear components of the pressure ratio and rotating speed states of the Moore-Greitzer model are transferred into the input vectors. Subsequently, the compressor characteristic is linearized into two modes, which describe the stable region and the unstable region respectively. As a result, the system’s state and input matrices both appear linear, to which linear realization and analysis are applicable. A linear quadratic regulator plus integrator is then chosen as closed-loop controller. By simulation it was shown that the modified model and characteristics can describe surge behavior, while the closed-loop controller can stabilize the system in the unstable operating region. The last-mentioned was achieved when massflow was 5.38 per cent less than the surge point.
Revisiting Trilateration Method Based on Time-of-Flight Measurements for Navigation Simamora, Yohannes S.M.; Rachmach, Nahdia Fadilatur; Rizqon, Muhammad Yaasir; Suseno, Kheri Agus; Hilmi, Muhammad Nursyams
Jurnal Riset Multidisiplin dan Inovasi Teknologi Том 2 № 01 (2024): Jurnal Riset Multidisiplin dan Inovasi Teknologi
Publisher : PT. Riset Press International

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59653/jimat.v2i01.432

Abstract

This paper revisits trilateration in three-dimensional positioning. Specifically, range between a positioning target and the reference points through time-of-flight (ToF) measurements. In a ToF, range is yielded by multiplying the time required by a wave to travel between two points and its propagation speed. Position of the target can be then estimated once the number of references are adequate, i.e. at least three for two-dimensional positioning and four for three-dimensional one. In this paper, the positioning is considered for navigation where the target moves following a trajectory whilst the ToFs take place in a certain period. The target position at the time is computed based on the ToFs through least square estimation. Through a numerical simulation, it is shown that the trilateration can track a target’s trajectory despite the decreasing performance at the end of the course.
Co-Authors Edi Leksono Harijono A. Tjokronegoro Hilmi, Muhammad Nursyams Rachmach, Nahdia Fadilatur Rizqon, Muhammad Yaasir Suseno, Kheri Agus