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A Semi-Automatic Thickness Inspection Technique for Marine propellers

厦门大学学报(自然科学版) 2002年第S1期41卷 213-213页

作者： M K Lam S F Lee C S Lam W S Chow p iovenitti S H Masood Department of Industrial Engineering&Management Hong Kong Institute of Vocation Education(Tsing Yi)Hong KongChina Industrial Research Institute Swinburne(IRIS) Swinburne University of TechnologyVictoriaAustralia

This paper describes the design and development of a Semi-Automatic precision Caliper System to measure the thickness of an outboard marine engine propeller *** commonly used methods for measuring the thickness of a propeller blade are reviewed in this *** include the p rops Scan,3D Vision System and Black ***,the operating practices and availability of different facilities in industry necessitate a more cost-effect ive *** alternative method using a Semi-Automatic precision Caliper S ystem is therefore *** of the design criteria,principles of oper ation as well as the testing and verification of the system are *** paper concludes that the Semi-Automatic precision Caliper System is a low cost and effective method for measuring the thickness of a propeller.

关键词： thickness measurement propellers profilemetry metrology surface measurement

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Design of Facial Impact protection Gear for Cyclists

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Journal of Transportation Technologies 2012年第3期2卷 204-212页

作者： Sanga Monthatipkul pio iovenitti Igor Sbarski Faculty of Engineering & Industrial Sciences Swinburne University of Technology Hawthorn Victoria Australia Faculty of Engineering & Industrial Sciences Swinburne University of Technology Hawthorn Victoria Australia

The concept of facial impact protection mask for cyclists is proposed in response to increased participation in cycling and the need for injury prevention. The research aims to develop an approach for design of facial impact protection gear to reduce the risk of severe injury. Impact test equipment and procedure, face surrogate and protection material performance criteria are developed. Three groups of protective materials – rigid crushable, semi rigid, and soft cushion foams are tested and assessed according to criteria. The criteria are linked to measures of the risk of facial and brain injuries: HIC (Head Injury Criterion), peak deceleration, Face-bone damage and energy absorption. The impact energy is simulated by a drop test using a 48 mm-radius-steel hemispherical impactor, with a weight of 4.63 kg similar to that of headform J specified in AS/NZS standard. The drop-height is 1500 mm, and the linear deceleration force of the impactor is recorded and used to establish the performance of the materials. The HIC is used to predict the risk of brain injury, whereas the developed face surrogate is used to assess facial bone injury. A 5.4 m/s facial impact to the unprotected-face of a cyclist can result in the risk of severe facial bone fracture and mild brain injury. The impact test results for rigid foam protection of 40 mm thickness shows no densification (bottom out) and absorbs the impact energy without damage to the Foam-bone of the face surrogate. At 20 mm thickness, rigid polyurethane foams performed best with Foam-bone damage ranging from 15.1% to 20.5%. Other materials with thicknesses of 20 to 28 mm showed Foam-bone damage between 21.8% and 35.1%. The HIC values ranged from 267 to 522, with memory foams and expanded polystyrene foam having the lowest values. peak deceleration ranged from 71 g to 105 g for the materials tested. It is concluded that the impact energy can be dissipated by the protection material thereby reducing the risk of severe facial inju

关键词： Facial Impact protection Cyclist Energy Absorption Impact Testing Road Safety Injury prevention

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Modelling and Optimisation of a Spring-Supported Diaphragm Capacitive MEMS Microphone

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Engineering（科研） 2010年第10期2卷 762-770页

作者： Norizan Mohamad pio iovenitti Thurai Vinay 不详

Audio applications such as mobile communication and hearing aid devices demand a small size but high performance, stable and low cost microphone to reproduce a high quality sound. Capacitive microphone can be designed to fulfill such requirements with some trade-offs between sensitivity, operating frequency range, and noise level mainly due to the effect of device structure dimensions and viscous damping. Smaller microphone size and air gap will gradually decrease its sensitivity and increase the viscous damping. The aim of this research was to develop a mathematical model of a spring-supported diaphragm capacitive MEMS microphone as well as an approach to optimize a microphone’s performance. Because of the complex shapes in this latest type of diaphragm design trend, analytical modelling has not been previously attempted. A novel diaphragm design is proposed that offers increased mechanical sensitivity of a capacitive microphone by reducing its diaphragm stiffness. A lumped element model of the spring-supported diaphragm microphone is developed to analyze the complex relations between the microphone performance factors and to find the optimum dimensions based on the design requirements. It is shown analytically that the spring dimensions of the spring-supported diaphragm do not have large effects on the microphone performance com pared to the diaphragm and backplate size, diaphragm thickness, and air-gap distance. A 1 mm2 spring-supported diaphragm microphone is designed using several optimized performance parameters to give a –3 dB operating bandwidth of 10.2 kHz, a sensitivity of 4.67 mV/pa (–46.5 dB ref. 1 V/pa at 1 kHz using a bias voltage of 3 V), a pull-in voltage of 13 V, and a thermal noise of –22 dBA SpL.

关键词： Capacitive Microphone Spring-Supported Diaphragm Microphone Modelling

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