Characterisation of Structure-Borne Sound Source Using Reception Plate Method

A laboratory-based experiment procedure of reception platemethod for structure-borne sound source characterisation is reported in this paper. he method uses the assumption that the input power from the source installed on the plate is equal to the power dissipated by the plate. In this experiment, rectangular plates having high and low mobility relative to that of the source were used as the reception plates and a small electric fan motor was acting as the structure-borne source. he data representing the source characteristics, namely, the free velocity and the sourcemobility, were obtained and compared with those fromdirectmeasurement. Assumptions and constraints employing this method are discussed

Finite Element Analysis on critical relative slippage of bolted joint under transverse loading

Critical relative slippage (Scr) is known as a limit before loosening mechanism to occur. This limit is very crucial to predict the performance of bolted joint. Therefore, in this study, investigation of Scr for M10 bolted joint under transverse loading was conducted using finite element (FE) analysis. FE model was validated by comparing the relationship between preload and twisting torque for FE model and theoretical values. Scr values from FE analysis and experimental results were compared and good qualitative agreement was obtaine

Characterization Of A Structure-Borne Source Using The Reception Plate Method

This paper presents the characterization of vibration strength obtained from reception plate method by applying the mobility concepts. It describes a laboratory-based measurement procedure, which determines the strength of a vibration source in terms of the total squared free velocity of the source. The source used in the experiment is the small electric fan motor installed on high mobility aIuminum panel in order to neglect the influence of the source mobility. The complexity of the mobility at the contact points are reduced using the single value of effective mobility. The aim is to validate the data obtained from the reception plate method with one from the direct measurement. Thus, this research is expected to give a simple but accurate way to determine input power from a structure-borne sound source

Development of Hybrid Semi-Analytical and Finite Element Analysis to Calculate Sound Radiation from Vibrating Structure

Simple analytical model of plate dynamics usually applies for rectangular plate with simply supported edges. Analytical model of sound radiation from rectangular plate is also convenient, but not for other geometries and other boundary conditions. This paper presents a hybrid mathematical model which combines a semi-analytical model with the Finite Element Analysis (FEA) method to determine sound radiation from a vibrating structure. The latter is employed to calculate the vibration velocity of a structure with a rather complex geometry. The results are then used as the input in the semi-analytical model to calculate the radiated sound pressure through the Rayleigh integral. Results from the proposed model are presented here for the radiation efficiency of rectangular plates with different boundary conditions

Development of Tomato Inspection and Grading System using Image Processing

Nowadays the food quality is became a major issue in health care. It is difficult to find the best food quality by ourselves in the market. This system was created to specify the quality of specific product. Quality is commonly related with product and it is very important to satisfy the customer’s desire. The system is focus on the quality of food which has impact on our health. For this proposed system, a tomato is been used as the product that to be tested for food quality. This paper explained a technique for automatically detecting tomatoes skin surfaces in digital color images. The system describes two-step process which the first is detecting regions which are likely to contain tomatoes skin in the color images and then extracts information from these regions which might indicate the location of a tomato in the image. An inspection and grading system for tomato that has been loaded as an image and after that the image passed through the brightness process. After the image taken from webcam and already loaded onto the system then the system will process the both images (captured and input) by reading the color in each of pixel images. The processes of the images in this system needed to display the percentages value of color in order to classify the grade of tomato. Matlab software and its image processing toolbox have been used in images processing and analysis. As the result, Graphic User Interface (GUI) for tomatoes inspection and grading system by using Matlab software version 7.0.4 are achieved. For the future recommendation this system can be upgraded by adding the various types of fruits or vegetarians

Development New Press Machine using Programmable Logic Controller

The Press Machine is a project that is designing a new way to improve the previous press machines in industries which has a few weaknesses in safety while operating processes. This will create a lot of problem to the operators which have the higher risk to have an accident. The new press machine is a project to improve previous press machine which have weakness in safety while operating it. This matter creates a lot of problem and at the same time the operators and technician have the higher risk to have an accident in industries. The solution for this problem is a development of a new program of machine which running same operation but the machine is more safety and easy to setup when machine pressing the radio panel using external timer. This machine controlled by the Programmable Logic Controller (PLC). It consists of 5 pneumatic cylinders which each cylinder have their own function. This project contains in 2 states of operations which in automatic and manual mode. In automation mode, all the operation will begin automatically after the operators pressed the 2 switch simultaneously. In manual mode, the operator need to press (switch on) in every state condition to complete the operation. That mean, every state operation has its own switch for the operation. The result showed press machine is able to press the component and device, push it to pick up unit then it will be hold by the pickup unit before it placed on the target place. For the future work, this system should be building with a larger machine as the press components. It will give more power to press the device. The suggestion that can carry out from this research is to use a circuit that can make the Direct Current (DC) current more stable and linear. This project uses the DC current from the motorcycle battery because it more safety for this project