Product
Design Specification
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| ITEM |
SPECIFICATION |
PRIMARY/ SECONDARY |
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Performance It would be possible to assess the stability of a floating body at various angle of heel. It would be possible to tilt the floating body to any desired angle. The apparatus would indicate the angle of heel of the floating body to either side. The apparatus would be able to compare stability of floating bodies of different cross sectional shapes. The centre of gravity of the floating body would be adjustable on a vertical plane The centre of gravity of the floating body would be adjustable on a horizontal plane. The apparatus would be safe and easy to use. The apparatus would of use to students of other engineering disciplines. The apparatus should be easy to clean and store. The floating body of the apparatus should be able to tilt to a minimum of 900 to either side. The apparatus should not have any sharp edges or corners to prevent injuries. The floating body should have some mechanism to allow it to be tilted on a fixed longitudinal axis. Environment No permanent damage should be caused by the product to the surroundings during operation. The Apparatus must use at least 50% recycleable materials. The product should have a comfortable noise level. Temperature, Pressure The product should be able to operate at temperatures from -10 to 500 C. The Product should be operable at altitudes from sea level upto 2000m. Humidity, Corrosion The Product should be able to operate in up to 80% humidity without condensation. Shock, Dirt, Dust and Abuse The Product needs to be able to endure dropping from a height of 700mm on to concrete floor without causing negative effect to its performance. Small surface damage such as scratching and denting is acceptable but damage to major working parts not. The product should be able to resist dirt such as dust, oil, ink etc which may fall onto its surface. The product should not be used for purposes other than the experiment, for example, as a container. Size, Weight The total weight of the apparatus should not exceed 10Kg. (dry weight) The weight of the floating body = 2 Kg (max) Size of the floating body: Length (max) = 300mm Height (max) = 140mm Width (max) = 200mm Size of the water tank: Length (max) = 350mm Height (max) = 200mm Width (max) = 300mm Vertical adjustable weight = 500g (max) Vertical adjustable sale height = 250mm (max) Ergonomics / Aesthetics The design of the apparatus should be based on a single user operation. The apparatus can be easily operated by left handed and right handed users alike. The apparatus can be operated comfortably from a standing or sitting position. The adjustable mechanisms should be easily accessible to the user. The water tank should have provisions for holding without slipping. No sharp edges to be exposed to the user to comply with the British safety standard. The scales and measuring instruments should be easily readable and legible. The apparatus should look professional. The water tank can be transparent to allow the users to observe the floating body movements University logo should be provided at the exterior of the product legibly. The apparatus should look robust to users Manufacturing and Materials The manufacturing methods to be used should be easily accessible or common in use. The manufacturing should produce minimum waste and be economical. The manufacturing method should consider university manufacturing facilities. The materials used for the Apparatus should be readily available and easily fabricated. The chosen materials should have good physical and chemical properties as required by the components. Wherever possible low priced materials should be used without compromising on performance and quality. The materials used should have resistance to common cleaning chemicals and water. Materials with good recycle potential to be preferred. The material used should be able to withstand exposure to damp atmosphere without causing a loss in performance. The chosen materials should retain their properties in a surrounding temperature range of 10°C to 30°C. Competition (ref. working file, ’Market Analysis’) It should outperform the stability vessel in A0.21 Customer (ref. working file, Customer) It should be interesting to prospective students It should enhance and reflect the image of the university It should enable the department to promote a good standard of equipment (ref. ‘Customer Needs via Brief’) The maximum time period for conducting the actual experiment should be one hour (ref. ‘Laboratory Sessions’) Life (ref. working file, ‘Life of the Product’) It is a one-off production that should be based on the current needs of the department The service life of the product is about 1,170 hours It would not be expected to fail within this service life The period for calibration should be no less than one year Documentation (ref. working file, Customer) It should enable a first-time user to conduct a formal laboratory session relating to the use of the equipment. It should include tips for teaching the theory and demonstrating the procedure. (ref. ‘Laboratory Sessions’) It should include instructions for maintenance of the equipment. (ref. ‘Customer Needs via Brief’) Manufacturing Facility Product is to be manufactured on site at the department of Mechanical and Design Engineering, University of Portsmouth. The use of existing machinery in the workshop will be used to manufacture product. Manufacturing of the product will be constrained to the facilities on-site of the university. Product sub-contracted to the university. Water containers are bought or made by the department. Investment Investments made towards product are by the department of Mechanical and Design engineering, University of Portsmouth. Quantity Approximately 10 in quantity. Constraints Product is constrained by the in-house facilities when being manufactured. Product will mainly be aimed for Marine Sports Technology students only. Only a limited number of products available. Testing of product will be in-house, using the existing facilities at the university. Testing to comply with standards (see Code of practice section). Design development will be constrained to Pro Engineer, Solid Works or other similar CAD software. Financial implications to product are dependent on the investment by the department of mechanical and design engineering at the university. Timescale Project time-scale is ten weeks continuously. This is from time plan of project to the presentation of product. 2 Project to be completed as a whole. No breaks between tasks. Lead-time allowed is one week. Design ideas and ideas development will be two weeks in duration. Product Cost Production cost should not exceed £350-400 per product. This is covering overheads, materials and packaging. 3 Safety Standards Safety standard should comply with BSEN ISO 12217-1, BS 7852. 4 Edges of the hydrostatic equipment should not have any sharp edges, particularly the corners to minimise minor injury to user. User should be able to grip product when product is wet and dry, before and after using the testing equipment. Sharp objects should be eliminated when during design development stage. Procedure for hydrostatic testing according to BS EN 12162:2001. 4 Design of product should only consist of one upright object pointing vertically. End point to be facing away from user. Patents Product should not breach the following patents: US 2003075096 Variable apparatus for controlling the movement of an object in water. 5 US5309857 Apparatus for transferring buoyancy in a nautical vessel. WO0189920 Keel assemblies FR2807999 Arrangement to vary the drag on a sailboat. Codes of Practice Design of product should comply with BS 7852 code of practice. Procedure for hydrostatic testing BS EN 12162: 2001 |
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