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Pressure balance equipped with a controlled-clearance (CC) piston-cylinder has been developed with the aim of improving hydraulic pressure standards in the pressure range of up to 1 GPa. To estimate the pressure distortion coefficient of the CC piston-cylinder, we performed characterization experiments based on the Heydemann-Welch (HW) model. In this paper, we focused on the change in the piston fall-rate...
An observed nonlinear dynamics is observable if the mapping from initial condition to output trajectory is one to one. The standard tool for checking observability is the observability rank condition but this only gives a yes or no answer. It does not measure how observable or unobservable the system is. Moreover it requires the ability to differentiate the dynamics and the observations. We introduce...
This paper presents an estimation method of rotational direction and speed for free running AC machines driven by an inverter without speed and voltage sensor. The method has four estimation modes, and the method utilized only the measured phase current of machines. The amplitude of current during the estimation is suppressed to lower levels such as the exciting current, which is smaller than the...
A new pressure balance with a controlled-clearance (CC) piston-cylinder has been developed with the aim of reducing the uncertainty of the pressure especially at high pressure. The effective area of the CC piston-cylinder was estimated based on the Heydemann-Welch model. Two parameters in this model, the jacket pressure coefficient and the zero clearance jacket pressure, were determined from characterization...
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