The efficiency and accuracy of design is critical for construction success. The realization of design is dependent on complete and coordinated design documents that are finalized through the submittal process. This process involves the transfer of design intent from the architect and engineer to the specialty trade contractor for the production of shop drawings. The use of information technology to increase the ability to meet this intent is not being fully utilized today. A case study was selected on the campus of Texas A&M University to investigate the impacts of CAD on the submittal process. The project was selected because it utilized both hand and CAD methods to produce shop drawings. The data collected included all contract documents, submittals, submittal logs, and interviews with the project participants. A comparative analysis was made between the shop drawings that were completed by hand and those that were done by CAD. An analysis quantified the number of notes and corrections made by the reviewers during the submittal process. A separate analysis was made of the number of errors in the interpretation and transferring of background information from the contract documents in the shop drawing production. Finally, interviews were conducted with the project participants to determine the cost associated with utilizing CAD to produce shop drawings. Although based on a single case study, the data showed that CAD had important impacts on the submittal process. The data suggests that when CAD is used to produce shop drawings, there are significantly less notes or corrections by the reviewers. It also suggests that the electronic transfer of design data from the architect and engineer to the subcontractor can ensure better design accuracy and lower overall project cost.

This thesis presents two contributions to the FPGA CAD domain. First, a study of glitch power in a commercial FPGA is presented, showing that glitch power in FPGAs is significant. A CAD algorithm is presented that reduces glitch power at the post-routing stage by taking advantage of don't-cares in the logic functions of the circuit. This method comes at no cost to area or performance. The second contribution of this thesis is a study of FPGA CAD algorithm noise {random choices which can have an unpredictable effect on the circuit as a whole. An analysis of noise in the logic synthesis, technology mapping, and placement stages is presented. A series of early performance and power metrics is proposed, in an effort to find the best circuit implementation in the noise space.

With the growing complexity of modern VLSI designs, design errors become increasingly common. Design debugging today emerges as a bottleneck in the design flow, consuming up to 30% of the overall design effort. Unfortunately, design debugging is still a predominantly manual process in the industry. To tackle this problem, we enhance existing automated debugging tools and extend their applications to different design domains. The first contribution improves the performance of automated design debugging tools by using structural circuit properties, namely dominance relationships and non-solution implications. Overall, a 42% average reduction in solving run-time demonstrates the efficacy of this approach. The second contribution presents an automated debugging methodology for clock-gating design. Using clock-gating properties, we optimize existing debugging techniques to localizes and rectifies the design errors introduced by clock-gating implementations. Experiments show a 6% average reduction in debugging time and 80% of the power-savings retained.

This thesis presents two contributions to the FPGA CAD domain. First, a study of glitch power in a commercial FPGA is presented, showing that glitch power in FPGAs is significant. A CAD algorithm is presented that reduces glitch power at the post-routing stage by taking advantage of don't-cares in the logic functions of the circuit. This method comes at no cost to area or performance. The second contribution of this thesis is a study of FPGA CAD algorithm noise {random choices which can have an unpredictable effect on the circuit as a whole. An analysis of noise in the logic synthesis, technology mapping, and placement stages is presented. A series of early performance and power metrics is proposed, in an effort to find the best circuit implementation in the noise space.

With the growing complexity of modern VLSI designs, design errors become increasingly common. Design debugging today emerges as a bottleneck in the design flow, consuming up to 30% of the overall design effort. Unfortunately, design debugging is still a predominantly manual process in the industry. To tackle this problem, we enhance existing automated debugging tools and extend their applications to different design domains. The first contribution improves the performance of automated design debugging tools by using structural circuit properties, namely dominance relationships and non-solution implications. Overall, a 42% average reduction in solving run-time demonstrates the efficacy of this approach. The second contribution presents an automated debugging methodology for clock-gating design. Using clock-gating properties, we optimize existing debugging techniques to localizes and rectifies the design errors introduced by clock-gating implementations. Experiments show a 6% average reduction in debugging time and 80% of the power-savings retained.

Ett av de mest komplexa gränssnittsområdena på Scanias lastbilar är gränssnittet mellan komponenter och ramsidobalkarna. Orsaken till detta är att det inte finns något standardiserat gränssnitt på hur infästningen av en rammonterad komponent ska ske, utan varje komponent har idag ett unikt gränssnitt mot ramsidobalken. Detta försvårar möjligheten till fri placering och speglingsbarhet längs ramsidobalkarna. Detta examensarbete har utförts i syfte att ta fram en beskrivning på hur en rammonterad modul bör utformas, vilka gränssnitt den ska ha mot ramen samt vilken standardiserad längdenhet den bör delas in i. Vidare har de komponenter och parametrar som påverkar chassikompositionen studerats för att få en bild över den problematik som finns när en flexibel chassikomposition ska uppnås. Examensarbetet behandlar komponenter mellan hjulhusen och de komponenter som studerats är bland annat: Trycklufttankar, SCR-tankar, ljuddämpare, tvärbalkar, bränsletankar och fjädring. Målet har varit att ge rekommendationer på hur dagens chassikomposition kan förbättras för att öka flexibiliteten och få en mer modulär produkt. Efter övergripande studier av dagens komponenter har ett koncept tagits fram på hur ett gränssnitt bör se ut för infästningen av en rammonterad komponent, var media ska dras och var fästen för påbyggnationer ska placeras. Resultatet visar att den första komponenten bör börja på ett avstånd av 675 mm från det teoretiska framaxelcentrumet i stället för de 700 mm som det är idag. Det andra främre gränssnittet bakom den andra framaxeln bör hållas kvar på 2675 mm från det teoretiska framaxelcentrumet. Utöver detta bör axelavståndsdelningen behållas tills det skapas en tydlig plan på hur utvecklingen av nya komponenter ska ske. Vidare bör det bakre gränssnittet delas in i tre steg; 705 mm, 818 mm och 905 mm. / One of the most complex areas of the interfaces at Scania is the interface between components and the side members on the truck. The reason is that there are no standardized interfaces for the attachment of a frame mounted component on the side member. Each component has its own unique interface, which makes it almost impossible to mount the components on other than standardized positions. This master thesis has been carried out to develop how a component mounted on the side member should be designed, which interfaces it should have to the side member and what standardized unit of length it should be divided into. The study also includes the components and parameters that have an effect on the composition of the chassi. The study discusses the components between the front and rear wheel housing; some of the studied components are: compressed air tanks, SCR tanks, silencer, crossmember, fuel tanks and suspensions. The goal with this master thesis is to give recommendations of how the composition of the chassi may improve to increase the flexibility and get a more modularized product. After a general study of the components of today a concept has been developed for how an interface should look like for the attachment of a component on the side member, where tubes and electric cables should be connected and where brackets for bodybuilders should be placed. The results show that the first component should start at a distance of 675 mm from frame front instead of 700 mm as it is today. The second interface behind the second front axle should be kept at 2675 mm from frame front. In additional to this the division of the axle distance should be kept as it is today until a roadmap for how the components will develop. Further, the interfaces in front of the rear axle should be divided into three steps; 705 mm, 818 mm och 905 mm.

No description available.

No description available.

Arbetet inleddes med ett möte med Evonova där projektet diskuterades. Företagets inledandetankegångar och idéer kring produkten framgick och arbetet påbörjades.Under arbetets gång följdes Fredy Olssons anvisningar i hur en teknisk rapport ska se ut. Alltinleddes med en brainstorm och kundundersökning. Kundundersökningens resultat mynnadeut i en kravprofil, till denna tillkom även Evonovas krav och önskningar. Kravprofilenanvändes när vi sållade ut lösningar från brainstormen.Vidare använde vi oss av idéerna vi fått fram och arbetade fram CATIA-modeller på möjligaförslag. Dessa mättes, gjordes om samt blev utvärderade av företaget. Enbart två modeller,hjärtat och droppen, ansågs tillräckligt tilltalande av uppdragsgivaren.Den slutgiltiga lösningen gjordes det en prototyp av som togs till företaget och UTEXPO.

This report describes the development of a high-voltage connector at the request of Scandinova Systems AB in Uppsala. The development process is described from the making of a customer demand specification, to the making of drawings for the manufacturing of prototypes. Scandinova develops high-voltage modulators, hence the need for connectors that can handle very large power pulses. Their current connector has several weaknesses that may cause the connector to melt or catch fire. The development began with a number of studies that included the modulator structure and the current connector structure and functions. In addition, to collect Further demands, requests or ideas for the new product a survey were distributed to the staff at Scandinova. All the collected information was summarized in a a customer demand specification. There after a wide variety of concepts were generated. The concepts were then compared, merged, improved, or rejected in order to get a stronger concept. The remaining concepts were then evaluated using a concept selection matrix. In consultation with Scandinovas R & D department it was then decided to further develop four of the concepts in 3D CAD. The selected concepts was then designed in detail and the material selection were made. This was followed by a final evaluation with Scandinova to evaluate the concepts. The evaluation showed that three of the concepts were still interesting. Therefore, drawings were produced for the remaining three concepts, the drawings were there after submitted to Scandinova for prototyping. This report shows that at least one of the concepts seems to be substantially better than Scandinovas current high-voltage connector.