Abstract
This paper presents a passive wireless pillar load measurement method based on surface acoustic wave (SAW) technology. A strain transfer mechanical structure was designed, and the strain distribution of an elastic substrate was analyzed using elastic thin plate bending theory. In addition, the relationship between the strain and frequency shift of the SAW resonator (SAWR) was analyzed, and a strain sensitivity numerical analysis using different bonding directions was performed. Results corroborated that the differential structure of resonators, one of which is placed at the edge along the direction of a diameter and the other is placed at the center with an angle of 45° to the diameter, is a suitable form of the SAW load sensors. Moreover, the SAWR parameters were optimized to obtain a high-performance resonator. Furthermore, The SAWRs and strain transfer mechanical structures were manufactured, the pillar load measurement system was set, and the proposed SAW load measurement method was evaluated. Experimental results affirmed that the load sensitivity is 8.64 kHz/kN. The SAW pillar load method is feasible for practical application.
Highlights
The steel pillar is one of the basic components of a shelf, and the shelf load is mostly applied on the pillar
A passive wireless pillar load measurement system based on surface acoustic wave (SAW) is proposed in this paper
ST-X cut quartz crystal was selected as the sensor substrate, and a numerical calculation was performed on strain sensitivity at different bonding directions
Summary
The steel pillar is one of the basic components of a shelf, and the shelf load is mostly applied on the pillar. When in the limit equilibrium state, slight external sway causes instability and damage to the frame structure, resulting in the collapse of the shelf structure. With the continuous enrichment of the cross-section of shelf pillars and the application of high-strength steel, the pressure pillar has been developed in the direction of light and thin walls, which may cause the instability of the pillar. The most common method of pillar load measurement is the resistance strain gauge. These advantages are high reliability, reproducibility, accuracy, and sensitivity and a small size combined with passive and wireless features. SAW sensors can be used to measure the pillar load. The present study tentatively demonstrates the utilization of SAW devices for pillar load measurement. The rest of this paper is organized as follows: Section II describes the SAW pillar load sensing structure design; Section III presents the SAW resonator (SAWR) structure parameter design; Section IV shows the SAW pillar load measurement system setup and experimental results with discussions; and Section V concludes the paper
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