FUNDAMENTAL APPROACH TO EVALUATING METHOD OF SLIP RESISTANCE OF STAIRWAY TREADS FROM A VIEWPOINT OF SAFETY : Evaluating method of slip resistance of stairway treads from a viewpoint of safety Part 1

This paper studies low-frequency sound transmission loss (STL) of an infinite orthogonally rib-stiffened sandwich structure flexibly connected with periodic subwavelength arrays of finite shunted piezoelectric patches. A complete theoretical model is proposed by three steps. First, the panels and piezoelectric patches on both sides are equivalent to two homogeneous facesheets by effective medium method. Second, we take into account all inertia terms of the rib-stiffeners to establish the governing equations by space harmonic method, separating the amplitude coefficients of the equivalent facesheets through virtual work principle. Third, the expression of STL is reduced. Based on the two prerequisites of subwavelength assumption and convergence criterion, the accuracy and validity of the model are verified by finite element simulations, cited experiments, and theoretical values. In the end, parameters affecting the STL performance of the structure are studied. All of these results show that the sandwich structure can improve the low-frequency STL effectively and broaden the sound insulation bandwidth.

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Low-Frequency Broadband Sound Transmission Loss of Infinite Orthogonally Rib-Stiffened Sandwich Structure with Periodic Subwavelength Arrays of Shunted Piezoelectric Patches

Zhang

Zheng

Huang

2017

Shock and Vibration

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Finite-Difference Time-Domain Analysis of Sound Insulation Performance of Wall Systems

Asakura

Sakamoto

2009

Building Acoustics

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A prediction method for the sound insulation of walls by vibro-acoustical numerical analysis using the finite-difference time-domain (FDTD) method is described. In order to accurately predict the sound insulation performance of walls, numerical modeling of the vibration energy loss of walls in the vibration analysis is necessary. In this study, the energy loss at the boundary part of the plates and the internal damping of the plates are modeled and the sound transmission loss of glass plates and plasterboard walls is calculated. A reasonable agreement is found between the calculation and measurement results and the applicability of the numerical analysis is confirmed.

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Effect of Differences in Wooden Floors on Human Physiology and Psychology during Walking II.

Morikawa

2023

Mokuzai Gakkaishi

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The purpose of this study was to clarify the effect of differences in wooden floor materials on walking with socks on. We conducted a walking experiment in four different model floors combining two types of floor finishing materials and two types of subflooring materials and a control floor (vinyl floor over the concrete subfloor) using surface electromyography of the lower limb and plantar pressure distribution as physiological indicators. It was found that the surface consolidated Japanese cedar, sugi (Cryptomeria japonica) wood finishing, which is uneven and non-slip, has smaller ratio of integrated electromyography (ratio of the integrated surface electromyogram for each model floor to the integrated surface electromyogram for the control) than the ceramic-coated Japanese cypress, hinoki (Chamaecyparis obtusa) wood finishing, which is smooth and slippery, and reduces the burden on the lower limbs during walking. The difference between the finished materials under the lowstiffness joist and 15-mm-thick plywood subflooring condition was smaller than under the high-stiffness 24-mm-thick plywood subflooring condition, indicating that the stiffness of the subflooring material has a secondary effect on the ratio of integrated electromyography. In the plantar pressure distribution, the ratio of entire plantar load to control was significantly higher for the surface consolidated Japanese cedar wood finishing under the joists and 15-mm-thick plywood subflooring condition, indicating that the low rigidity subflooring material makes the uneven surface consolidated Japanese cedar floor finish material more difficult to walk on.

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FUNDAMENTAL APPROACH TO EVALUATING METHOD OF SLIP RESISTANCE OF STAIRWAY TREADS FROM A VIEWPOINT OF SAFETY : Evaluating method of slip resistance of stairway treads from a viewpoint of safety Part 1

Cited by 3 publications

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Low-Frequency Broadband Sound Transmission Loss of Infinite Orthogonally Rib-Stiffened Sandwich Structure with Periodic Subwavelength Arrays of Shunted Piezoelectric Patches

Low-Frequency Broadband Sound Transmission Loss of Infinite Orthogonally Rib-Stiffened Sandwich Structure with Periodic Subwavelength Arrays of Shunted Piezoelectric Patches

Finite-Difference Time-Domain Analysis of Sound Insulation Performance of Wall Systems

Effect of Differences in Wooden Floors on Human Physiology and Psychology during Walking II.

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