Uncertainty evaluation of a primary shock calibration method for accelerometers

Ueda, Kazunaga; Umeda, Akira; Imai, Hidetaka

doi:10.1088/0026-1394/37/3/2

Cited by 10 publications

(10 citation statements)

References 10 publications

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“…v1=v2 and that the phase difference between V1(t) and V2(t) is exactly 90 degrees, then the phase amplitude Ø1(t,) can be calculated as follows. (4)]+mir (10) where m is an integer which should be chosen to avoid discontinuities of Ø2(t). The values of t) are approximated by the following equation.…”

Section: The Sine-approximation Method(sam)mentioning

confidence: 99%

<title>Current status of measurement standards for vibration and shock in NRLM</title>

Ueda¹,

Usuda²,

Kurosawa³

2000

Fourth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications

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This paper outlines the current status of measurement standards for vibration and shock at the National Research Laboratory of Metrology of Japan. As for the vibration acceleration standards, two systems have been established. One system is for the middle and high frequency range(20 Hz to 5 kHz) and its acceleration range lies within I m/52 to 100 m/s2. The other system is for the low frequency range(1 Hz to 200 Hz) and its acceleration range lies between 0. 1 mIs2 and 100 mIs2. A test facility is under development to evaluate the accelerometers' performance in different temperature and humidity. With this facility, temperature of the test chamber can be varied from -40°C to +100°C and humidity from 20% to 90%. A calibration apparatus is also under construction to establish the national standard of shock acceleration in the high acceleration range from 102 m/s2 to iO m/s2.

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Section: The Sine-approximation Method(sam)mentioning

confidence: 99%

<title>Current status of measurement standards for vibration and shock in NRLM</title>

Ueda¹,

Usuda²,

Kurosawa³

2000

Fourth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications

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“…The technology for generating high-level acceleration includes the ref lection of elastic waves proposed by B. Hopkinson, [15] and the calibration of a vibrometer using this principle has been reported in the past. [16] However, the elastic waves are characterized by the physical property called elasticity. There were problems that the peak acceleration and duration were restricted, and the peak value of generated acceleration was too high compared to the demand.…”

Section: Scenario Of the Randdmentioning

confidence: 99%

Establishing reliability in vibration measurement and its international equivalency

Usuda¹,

Oota²,

Nozato³

et al. 2017

Synthesiology English edition

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earthquakes, the accelerometer used in inertial navigation of aircraft, and the acceleration sensor installed in smart phones are also vibrometers. On the other hand, as it can be projected from Fig. 1, while the mass can stay at a fixed point as long as the vibration amplitude is small enough, the mass will not be able to stay at the fixed point due to the restoring force of the spring when the vibration surpasses a certain level. Such a property is determined by the stiffness of the spring, the natural vibration when considered as a mass-spring model, and the viscous element (damping) that absorbs vibration though this is abbreviated in Fig. 1. The vibrometer manufacturers optimize the above parameters for specific uses such as measurement of earthquakes, vibration of structures such The metric system and primary national metrology standards are necessary, but not sufficient for obtaining measurement equivalency. Recently, national metrology institutes of various countries including NMIJ/AIST of Japan are participating in international comparisons to confirm equivalency of their measurement capabilities, under a mutual recognition of arrangement (MRA). In this report, we describe progress on improving vibration measurement at NMIJ/AIST, along with global activities for establishing MRA. We also discuss future issues for improving vibration measurement.

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“…The high-shock is based on elastic wave propagation inside a long thin bar and is induced to an accelerometer attached on an edge surface of the bar where a reflection of the elastic wave occurs [5]. The shape of the high-shock waveform is normally described by the 1 st derivative of the Gaussian velocity function [6]. In the computer simulations, the mathematical function for high-shock was defined by equation (2).…”

Section: High Amplitude Shockmentioning

confidence: 99%

A study of Savitzky-Golay filters for derivatives in primary shock calibration

Nozato¹,

Bruns

Volkers

et al. 2014

ACTA IMEKO

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This manuscript reports the result of an investigation into two types of digital filters for numerical differentiation of the displacement signal in the case of primary shock calibration of accelerometers. The first is a difference method with a 4th-order Butterworth low-pass (4th BW) filter; the other is a Savitzky-Golay (S-G) filter, which applies a moving polynomial approximation. The computational comparison was applied to low and high amplitude shocks using known excitation functions. Each sum of residuals was compared for the optimized conditions of the 4th BW and S-G filters. The results of computer simulation indicated that the S-G filters exhibited better performance for the derivatives than the 4th BW filters. In addition, an analytical comparison using experimental vibration data also indicated that the S-G filters exhibited better derivative characteristics than the 4th BW filters.

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Uncertainty evaluation of a primary shock calibration method for accelerometers

Cited by 10 publications

References 10 publications

<title>Current status of measurement standards for vibration and shock in NRLM</title>

<title>Current status of measurement standards for vibration and shock in NRLM</title>

Establishing reliability in vibration measurement and its international equivalency

A study of Savitzky-Golay filters for derivatives in primary shock calibration

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