Physical Principles of a Piezo Accelerometer Sensitive to a Nearly Constant Signal

Gupalov, Valery I.; Kukaev, Alexander S.; Shevchenko, Sergey; Shalymov, Egor V.; Venediktov, Vladimir Yu.

doi:10.3390/s18103258

Cited by 7 publications

(6 citation statements)

References 3 publications

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“…25 However, the goniometer requires both hands of the rater to be used, which hinders pelvis monitoring, a factor that implies probable overestimation of hip flexion amplitude. [21][22][23][24][25][26][27][28] This study presented hip flexion of approximately 107° with goniometer and 106° with accelerometer. Although the UG is considered a gold standard in evaluations of joint range of motion, it presents significant differences for hip flexion (113°-141°).…”

Section: Discussionmentioning

confidence: 99%

“…Volunteers were asked to wear adequate clothing and to provide no resistance to performing movements. Initially, the hip flexion amplitude was evaluated in supine horizontal position by digital goniometry 22,23 , it was followed by the evaluation of hip flexion amplitude and pelvis retroversion by the system with accelerometers. Each rater examined the hips independently, without knowing the results of the other raters.…”

Section: Methodsmentioning

confidence: 99%

“…The three piezoelectric "membranes," spatial and orthogonally arranged among each other in triaxial accelerometers, varying their deformations and responses according to the vector "g" (module, direction and gravitational acceleration direction). 23 Electronic system and computer…”

Section: Mpu-6050 Casingmentioning

confidence: 99%

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Measurement of Pelvic Retroversion During Hip Flexion: Evaluation With Accelerometers

et al. 2020

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Objective: To quantify pelvic retroversion during clinical evaluation of hip flexion with accelerometers and to verify the reliability of these sensors to measure hip flexion. Methods: An accelerometer was positioned laterally in the pelvis to measure pelvic retroversion. Another accelerometer was positioned anteriorly on the thigh to evaluate hip flexion amplitude. The evaluations were performed with volunteers in supine position by three raters. For evaluation of pelvic retroversion, the mean ± SD (minimum-maximum) was calculated. Reliability of the accelerometer between raters was determined by intraclass correlation coefficients (ICC). The linear correlation coefficient between hip flexion was determined by using goniometer and accelerometer. Results: The mean pelvic retroversion was 7.3° ± 0.93° (6°-11°) in the clinical limit of the hip range of motion, which was 106.25° ± 10.46° (93°-130°). The ICC between two raters were 0.60, 0.71 and 0.74 (goniometer) and 0.46, 0.71 and 0.83 (accelerometer). The linear correlation between hip flexion measurements with goniometer and accelerometer was 0.87. Conclusion: During clinical evaluation of the final range of hip flexion, there was an associated pelvic movement of approximately 7.3º. Accelerometers have proven to be reliable for measurement of hip flexion. Level of Evidence III, Study of nonconsecutive patients with no gold reference standard applied uniformly.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Measurement of Pelvic Retroversion During Hip Flexion: Evaluation With Accelerometers

et al. 2020

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“…The measured acceleration signal was filtered by the CFC 1000 filter [ 27 ]. From the physical principle, the piezoelectric accelerometer cannot measure free-fall gravity acceleration [ 28 ]. The experimental acceleration curve decreased to minus g just after release and reached the equilibrium of 0 g during the free fall, so the experimental acceleration curve needed to be adjusted to be comparable to the simulation results.…”

Section: Methodsmentioning

confidence: 99%

Identification of the LLDPE Constitutive Material Model for Energy Absorption in Impact Applications

et al. 2021

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Current industrial trends bring new challenges in energy absorbing systems. Polymer materials as the traditional packaging materials seem to be promising due to their low weight, structure, and production price. Based on the review, the linear low-density polyethylene (LLDPE) material was identified as the most promising material for absorbing impact energy. The current paper addresses the identification of the material parameters and the development of a constitutive material model to be used in future designs by virtual prototyping. The paper deals with the experimental measurement of the stress-strain relations of linear low-density polyethylene under static and dynamic loading. The quasi-static measurement was realized in two perpendicular principal directions and was supplemented by a test measurement in the 45° direction, i.e., exactly between the principal directions. The quasi-static stress-strain curves were analyzed as an initial step for dynamic strain rate-dependent material behavior. The dynamic response was tested in a drop tower using a spherical impactor hitting a flat material multi-layered specimen at two different energy levels. The strain rate-dependent material model was identified by optimizing the static material response obtained in the dynamic experiments. The material model was validated by the virtual reconstruction of the experiments and by comparing the numerical results to the experimental ones.

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“…Вариации конструкции датчиков, основанных на воздействии акустических волн, практически безграничны. Таким образом, можно построить датчики на поверхностных акустических волнах, чувствительные к слабым постоянным сигналам [13], а также датчики углового движения на объемных акустических волнах [14] из-за поляризации волны.…”

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Optimizing the Design of Surface-Acoustic-Wave Ring Resonator by Changing the Interdigitated Transducer Topology

Shevchenko

Mikhailenko

Nyamweru

2021

Izv. vysš. učebn. zaved. Ross., Radioèlektron.

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Introduction. Previous works considered the frequency characteristics and methods for fixing sensitive elements in the form of a wave ring resonator on surface acoustic waves in a housing made of various materials, as well as the influence of external factors on sensitive elements. It was found that the passband in such a case is sufficiently wide, which can affect adversely signal detection when measuring acceleration using the sensitive element under development. Therefore, it has become relevant to reduce the sensitive element’s bandwidth by changing the design of the interdigitated transducer (IDT).Aim. To demonstrate an optimal topology for an IDT with a low bandwidth, leading to improved signal detection when acceleration affects the sensitive element.Materials and methods. The finite element method and mathematical processing in AutoCAD and in COMSOL Multiphysics.Results. Nine topologies of IDT are proposed. All these types were investigated using the COMSOL Multiphysics software on lithium niobate substrates, which material acts as a sensitive element. The frequency characteristics are presented. The data obtained allowed an optimal design of the ring resonator to be proposed: an IDT with rectangular pins without selective withdrawal.Conclusion. Self-generation in a ring resonator can be performed by withdrawing no more than one pair of IDTs for 10 or more periods. In this case, the withdrawal of IDTs should be uniform. With an increase in the number of IDT withdrawals, the geometry of the ring resonator is violated, and the wave leaves the structure. The presence of a shared bus keeps the surface acoustic wave inside the IDT structure, and the narrowing of the periods towards the inner part of the structure makes it possible to improve the frequency characteristics of the ring resonator on surface acoustic waves.

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Physical Principles of a Piezo Accelerometer Sensitive to a Nearly Constant Signal

Cited by 7 publications

References 3 publications

Measurement of Pelvic Retroversion During Hip Flexion: Evaluation With Accelerometers

Measurement of Pelvic Retroversion During Hip Flexion: Evaluation With Accelerometers

Identification of the LLDPE Constitutive Material Model for Energy Absorption in Impact Applications

Optimizing the Design of Surface-Acoustic-Wave Ring Resonator by Changing the Interdigitated Transducer Topology

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