1,721,113 research outputs found
Gear geometric design by B-spline curve fitting and sweep surface modelling
No full textIn this paper B-spline curve fitting and sweep surface generation are used for the geometric design of involute gears. Tooth profiles are described by a B-spline formulation based on interpolating data points with first and second derivative constrains. Tooth surfaces are generated by sweeping the B-spline profiles along specified trajectories. This representation scheme enables tooth shapes to be interactively controlled by manipulating control polygons and sweep trajectories. A CAD-CAE integration allows the analysis of contact and structural three-dimensional problems for various geometric configurations. In the paper the methodology is applied to the geometric design of involute pinions of face gear drives
A technique for smoothing interior thermoelastic data and enhancing boundary information
No full text
The development of a hybrid technique employing the boundary element method for thermoelastic stress separation
No full textFull-field separation of principal stresses by combined thermo- and photoelasticity RID A-2148-2009
No full textThe combined use of thermoelastic stress analysis and full-field reflection photoelasticity based on the phase-stepping technique has been developed for two-dimensional problems. The first method determines the sum of the principal stresses, the latter evaluates the difference of the principal stresses, Thus the principal stresses were separated at each point in the field of view without reference to neighboring points, An evaluation of this approach has been performed using a tensile plate with a central circular hole. The results show that the analysis carried out combining thermo- and photoelasticity incurred errors no larger than those of each system working independently
A computer-aided design-based system for posture analyses of motorcycles
No full textThis paper presents a computer-aided design (CAD)-based system for ergonomics analyses of motorcycles, which includes three-dimensional models of vehicle configurations and equipment, three-dimensional human models of various anthropometries and evaluative techniques to assess reach and postures. The system is based on a modular structure that integrates an established top-down computer-aided design framework for motorcycle design, a widely used anthropometric database and specific behavioural criteria defined by an experimental procedure correlating driving postures and vehicle configurations. As a result, vehicle designers are able to use a single analysis tool to prognosticate and assess postural comfort, from the earliest stages of the design process. In the paper, issues in vehicle design with reference to ergonomics assumptions and posture evaluations by a computerized system are discussed
Polymer coating as a strain witness in thermoelasticity
No full textThe work described in this paper offers the possibility of using a polymer coating as a strain witness in thermoelasticity. In particular, the efficacy of a polymer coating for making thermoelastic measurements is investigated by experiment and the supporting theory is presented. It was found that the thermoelastic response is greatest with thick coatings at high frequencies. However, thicknesses of more than 0.5 mm and frequencies greater than 5 Hz provide adequate results
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