The development of an intelligent system for the design evaluation and improvement of manufacturability and assembly of product.

Assembly is one of the most important stages of product development. Design for Manufacturing and assembly (DFMA) is one of the approaches to improve the product designs for easier and least assembly cost with high functionality of the products

Enhancing Design for Aesthetics Based on Product Platform Architecture

Traditionally, most people buy a product based on performance and cost, but recently appearances, comfort and aesthetic are preferred. Customers are now becoming more complex and require not only good product performance but also appearance. To enhance product appearance, product platform has been proposed as new approach to the design for aesthetics. In this work, a platform is identified based on component sharing among the product variants. Then the aesthetic rules are applied to the platform. A Product Family Aesthetic Index (PFAI) was developed to measure the product performance. The evaluation is based on component commonality and aesthetic aspect. The result indicates that the Product Family Aesthetic Index had increased through redesigning several components in the product. A case study of the fan family was conducted to verify the methodology

Analysis of exhaust muffler with micro-perforated panel

An expansion chamber muffler with the use of a micro-perforated panel (MPP) was developed to improve the acoustic performance. A simulation was carried out using the SysNoise application in the LMS Virtual Lab based on the boundary element method, and the model was verified with the transmission loss measurement using the two-load method and showed good agreement. There was a 40 % accuracy improvement in the BEM model compared to the analytical approach for the simple expansion chamber muffler. The results showed that the performance of this muffler with an 80 mm air cavity depth improved by 75 %, where the transmission loss curve of the muffler became broader, and the hump-shape of the curve was more flat at the top when compared with the performance of a conventional simple expansion chamber muffler. The new muffler with the MPP was applied to a small utility engine with a displacement of 35 cc and the results showed that the noise level was reduced by 20 dBA for the frequency band of 125 Hz to 4000 Hz

Transient analysis of drum brake squeal with binary flutter and negative friction-velocity instability mechanisms

A two degree-of-freedom model of a drum brake system is developed to investigate the criteria for unstable condition under friction-induced vibration instability mechanisms of both flutter instability and negative friction-velocity instability. This model considers the drum as the main component that is subjected to the friction-induced vibration. The influences of the friction coefficient, normal load, sliding velocity, contact stiffness, damping coefficient and the location of centre of pressure on the shoes on the instability of the system are investigated using transient analysis. The results indicate that the minimal model displays all the characteristics of the unstable system comparable to the previously published experimental and finite element modeling results

Dynamic Characterization Of Engine Mount At Different Orientation Using Sine Swept Frequency Test.

Rubber engine mounts are commonly used to provide vibration attenuation. The loss factor and dynamic stiffness of engine mount provide fundamental information of the energy dissipation

An Approach To Platform Design Using Design And Performance parameters Interactions.

To respond to the challenge of agile manufacturing, companies are striving to provide a large variety of products at a low cost

Compressive Properties of Carbon Fibre Reinforced Plastic (CFRP) at Low Strain Rate

An experimental programme was carried out for testing and characterising the mechanical properties of carbon fibre reinforced plastic (CFRP) at low strain rates ranging from 10-' to 10 Is. Transverse compressive properties were obtained by carrying a series of quasi-static and dynamic tests on filament wound CFRP tubes with winding angle of ± 90° (the angle is relative to the tube axis). The quasi-static test were carried out using an Instron and RDP machines whereas dynamic tests on drop hammer rig. Axial and hoop strains were measured by foil strain gauges bonded to the specimen inside and outside surfaces. Load-displacement, load time and strain-time signals recorded during relevant tests are used to produce stresss train curves. The transverse compressive strength and ultimate failure strain increases with increasing strain rate. The modulus and Poisson's ratio are independent of strain rate. The stress strain curves at different strain rates exhibit a degree of non-linearity. No rate effect is observed on the mode of failure

High-temperature tribological properties of Co-29Cr-6Mo alloy fabricated by selective laser melting process

This paper discusses the experimental procedure and results of an investigation into the sliding wear behavior of Co-Cr-Mo specimens produced by selective laser melting (SLM) process. The sliding wear tests were carried out with different normal loads, sliding frequencies, and temperatures. The results showed that the coefficient of friction decreased as the applied normal load increased due to the temperature effect. The wear rate increased significantly at higher loads due to increased surface stresses. Testing the specimens at elevated temperatures resulted in a decrease in COF due to thermal softening and the formation of an oxide layer on the surface. The wear rate increased for specimens tested at 200°C due to a decrease in hardness and strength, but the wear rate decreased at higher temperatures due to the protective effect of the oxide layer. The obtained results showed the SLM-printed Co-Cr-Mo alloy exhibited good mechanical properties and wear resistance, making it a promising material for tribological applications, especially at elevated temperatures

A Methodology To Evalute Design Efficiency Based On Assembly Criteria In Support Of Design For Modularity.

Companies are striving to produce high quality and reliable product at the lowest cost to remain competitive in the market

Transient analysis of drum brake squeal with binary flutter and negative friction-velocity instability mechanisms

A two degree-of-freedom model of a drum brake system is developed to investigate the criteria for unstable condition under friction-induced vibration instability mechanisms of both flutter instability and negative friction-velocity instability. This model considers the drum as the main component that is subjected to the friction-induced vibration. The influences of the friction coefficient, normal load, sliding velocity, contact stiffness, damping coefficient and the location of centre of pressure on the shoes on the instability of the system are investigated using transient analysis. The results indicate that the minimal model displays all the characteristics of the unstable system comparable to the previously published experimental and finite element modeling results