Studies have been made of the normal modes of a 20.7 cm diameter steel gamelan gong. A finite-element model has been constructed and its predictions for normal modes compared with experimental results obtained using electronic speckle pattern interferometry. Agreement was reasonable in view of the lack of precision in the manufacture of the instrument. The results agree with expectations for an...

This paper deals with the design of the welding fixture for the head end sub-assembly of a rocket motor case. The head end sub-assembly consists of four parts namely Y-Ring, Dome, Igniter Boss and the Fore skirt ring that have to be welded to each other with a specified tolerance and weld quality. The material used in the manufacture of different parts of head end sub-assembly is Maraging steel...

This paper presents a multi-objective optimization of the laser milling process of micro-cavities for the manufacturing of drug eluting stents (DES). The diameter, depth and volume error are considered to be optimized in function of the process parameters including laser intensity, pulse frequency and scanning speed. A set of designed experiments is carried out in a pulsed Nd:YAG laser system u...

M ake-to-order (MTO) manufacturers must ensure concurrent availability of all parts required for production, as any unavailability may cause a delay in completion time. A major challenge for MTO manufacturers operating under high demand variability is to produce customized parts in time to meet internal production schedules. We present a case study of a producer of MTO offshore oil rigs that hi...

Tool steels are widely used materials for making elements of metals, polymers, ceramics and composites. Inflated consumer expectations of contemporary civilization entail the manufacture of better and better tools, accompanied by reduced energy consumption. The application of simulators and controls of technological processes enables the design of optimum processes without the need for time con...

Additive manufacturing (AM) processes offer a good opportunity to manufacture three- dimensional objects using various materials. However, many of the processes, notably laser Powder bed fusion, face limitations in specific geometrical features due their physical constraints, such as thermal conductivity surrounding medium, internal stresses, and warpage or weight part being manufactured. This ...

During the 1960s, the northwest region of the United Kingdom (illustrated in Figure 1) became the home of several innovative design-based companies producing clothing and equipment for mountaineering and outdoor sports. This region borders on the Pennines. It includes north Cheshire, Manchester, Lancashire, Derbyshire, Sheffield and parts of what is now Yorkshire. From the early 18th century, t...

S ingle-use bioprocessing equipment has become wellaccepted technology in a relatively short time. Disposable devices and components have created market niches and new segments that continue to evolve. In this dynamic environment, it is diff icult to measure acceptance or assess market growth. Here we project the world market for cell culture single-use systems (SUS) as well as problems affecti...