and speed humps. Conclusions: Bus drivers are potentially being exposed to daily vibration levels higher than recommended especially on certain road types. Each features an integrated all-composite body/chassis to which the metal suspension/drivetrain systems were mounted directly. Proterras composite bus body was envisioned, prototyped, tested and developed by veteran materials engineers with more than two decades of experience in the automotive industry. The current seat in this study does not attenuate the vibration. Because dlba Robotics and other experienced composites industry players were brought in at the early stages of the project, Proterra and its tooling suppliers were typically able to manage interface tasks, such as exporting the surface geometry, with a minimum of problems.
Body molds consisted of hand layed mold shells supported by egg-crate structures. Although trials are ongoing, it is already possible to say that the composite bus body has met its most important test: It came in near its target weight of 4,200 lb/1,905. After the SolidWorks model and structural design and basic material selection were completed, the bus body plug was replicated by dlba Robotics (Chesapeake,.
Given the aggressive development schedule envisioned by CTE, it was essential that selected materials have a proven track record because there was little time for materials characterization. . (Golden, Colo.) and then these parts were fabricated at the.F. Calif.) and polished to obtain the final finished surface prior to mold fabrication. saertex USA offered a complete range of suitable materials, and the companys technical support team worked directly with Proterras design team during composite/component design, analysis and process-engineering phases. Standards have been adopted (ISO 2631-1) green eggs and ham to guide researchers in measuring and analysing WBV levels. Parts for ALL Makes Models. S (apta, Washington,.C.) bus design guidelines, achieving a distinctive look, and optimizing the bus body-in-white for cost and manufacturability within these parameters. These included (in the order they were developed the Metroliner in Germany; a bus once built by the now defunct Neoplan USA in Lamar, Colo.; the Southern California Rapid Transit Districts (scrtd) Advanced Technology Transit Bus (attb and two designs by North American Bus Industries. This strategy proved advantageous because the very close agreement between the results obtained by the separate analyses increased Proterras confidence in the final design. Layout, mechanical and electrical design configuration, solid modeling and preliminary structural analysis functions were performed in-house at Proterra. For example, the attb and CompoBus programs had put to rest concerns about side-impact crashworthiness and repairability, freeing Proterra to focus on more prosaic concerns. .
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