Electrolytic decomposition of hydroxylammonium nitrate (HAN) is appealing for development of chemical micropropulsion system due to its effectiveness in thermal management. In this paper we present the decomposition characteristics and behaviour of various HAN ternary mixtures prepared according to 0 Oxygen Balance (0 OB). There are multiple stages of decomposition depending on the type of fuels added into the HAN solution. While concentrated HAN solution (73 wt%) has only single stage of decomposition, the saccharides-based HAN ternary mixtures has three stages reaction with increased energy release. The addition of nitrogen-rich compounds has sustained the electrolytic decomposition process into the second stage of reaction, which produced the highest decomposition temperature. The study also reveals a linear relationship between the electrical resistivity of HAN ternary mixture and reaction rate in the first stage of reaction, indicating the presence of Joule heating in the process. The influence of electrical resistivity of the ternary mixture became negligible in the second stage of reaction. This work concludes the importance of combined electrical and thermal energy in the first stage decomposition of HAN ternary mixtures.
A load cell is an important component in measuring thrust generated by rocket in rocket technology research and development. It aims to test the rocket thrust in achieving the targeted objectives of the project. A load cell is a transducer that is used to convert a force into electrical signal and it usually consists of four strain gauges assembled in Wheatstone bridge configuration. The strain gauge converts the deformation (strain) to electrical signals. This conversion occurs in two stages. First, the strain gauges on the load cell will detect the deformation of load cell structure (tension or compression) and second, the strain gauge will convert the changes in the load cell in terms of voltage readings. Before the load cell can be used as the thrust sensor in rocket testing, it must undergo a calibration process to determine the relation between Load (kg) and Voltage (V). LabVIEW is used as a platform for data logging interface which is connected to the National Instrument hardware. National Instrument hardware acts as a signal conditioning which allow the voltage readings acquired by load cell to be collected and analyzed by LabVIEW. Each load cell has its own equation that links between force and voltage. The equation is used as a reference to convert the voltage reading to thrust.
This research focuses on the electrical noise coming from the sensor: load cell which is being used in rocket thrust measurement system. The aim is to investigate the noise contained in the measurement data. Fast Fourier Transform (FFT) is used as an indicator for appropriate cut off frequency in filtering data. Low Pass Filter is used as the measurement of thrust for it produces steady-state signal and acceptable transient response. Results confirmed that there are significant differences for Signal Noise Ratio (SNR) value between filtered and unfiltered data. Data noise has an impact to the true value of the expected results that affects data interpretation. It is shown that the influence of noise on the measurement data has been successfully reduced by the method used.
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