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The model simulated the insertion and stress relaxation of the hearing protection devices. Results from these models were compared against discomfort measured in use. The model results show that discomfort is a function of contact pressure and area. Average contact pressure and total contact force were identified as the key metrics that correlate to comfort ratings from the use studies.
Customer Papers
Lift force formation in a thrust bearing of 800-tons rotor of electric power station is discussed in the given paper. The problem is solved numerically. Direct coupling between finiteelement system Abaqus calculating stress and strain state of an bearing parts and finite-volume system FlowVision-HPC calculating oil flow in gap between a collar and a shoe of bearing is used. The shape of the gap between the shoe and the collar, the clearance value, the moment of the friction force, and the temperature distribution of oil over the clearance are determined.
Customer Papers
The paper deals with the dynamic performance of a simply reinforced concrete tower built using prefabricated elements. The main uncertainty of this strategy stems from the possible cracking of the concrete and its implications on the stiffness, natural frequency and dynamic amplification of the tower.
Customer Papers
Cataract surgery is the most common surgery in America today. Modern surgeries require the opacified crystalline lens to be removed and for a prosthetic lens to be inserted through a suture-less incision during a 5-10 minute outpatient procedure. The industry is driving for smaller incisions by redesigning the lens and insertion device geometry in addition to new materials.
Customer Papers
Bird impact damage in complex aircraft structure has been investigated using explicit transient dynamic analysis by Abaqus/Explicit in order to fully employ its large library of elements, material models and the ability of implementing user defined materials. The numerical procedure has been applied on the very detailed large airplane secondary structure consisting of sandwich, composite and metallic structural items that have been modeled with 3D, shell and continuum shell elements, coupled with appropriate kinematic constraints. Bird has been modeled using Coupled Euler Lagrangian approach, in order to avoid the numerical difficulties connected with the mesh. The impact has been applied in the area that is the most probably subjected to the impact damage during the exploitation.
Customer Papers
An important step in the development of a new aircraft is the preliminary design, which determines the configuration itself and key parameters about cabin, fuselage, wing, landing gear, control surfaces and engines. The design has to fulfil a certain number of constraints, but also to optimize a given cost function. Therefore the engineering team has to investigate a wide range of fundamentally different design alternatives and provide numerical results by using a tool-chain of multi-disciplinary and multi-level methods.
Customer Papers
A simulation technology has been developed to predict the transmission efficiency of a metal pushing V-belt and pulleys that make up the drive system of a continuously variable transmission (CVT). When a CVT operates in an actual vehicle, pulley thrust pressure is adjusted by feedback control to maintain a speed ratio. This feedback control has been implemented, for the first time, in an existing simulation that predicts the dynamic behavior of a metal pushing Vbelt using Abaqus/Explicit version 6.8-1 analysis. The new simulation enables stable control of a target speed ratio when appropriate gains are set for each analysis condition.
Customer Papers
The performance of an IC engine has an ionic bond with the performance of lubricating oil system. Oil sump and Oil Suction Pipe is one such assembly. The oil sump acts as partially filled reservoir of lubricating oil. The oil pump sucks the oil through the oil strainer which is immersed inside the oil sump. Design of oil sump involves designing for capacity, layout, engine tilt angles, and NVH. This paper deals with design of oil sump for engine tilt angles.
Customer Papers
The brief for the boat is to set a new world outright sailing speed record at Portland, UK. The choice of location influences the overall concept from the outset, since the conditions are closer to real world conditions when compared to currently favored locations for speed sailing. The boat is configured to add at least 10 knots to the current record by setting a speed above 60 knots (111 km/h). At speed the boat hulls will fly above the surface using a wing in ground effect. The pilot is able to sail on both port and starboard tack and can actively control the craft in roll and height as well as yaw.
Customer Papers
The use of Underground Gas Storage (UGS) is expected to increase considerably in the near future due to various factors. Many of the UGS wells require sand control. Expandable Sand Screens (ESS) have many advantages as a completion option in UGS wells. But there has always been a concern on the effects on ESS due to cyclic loading. The paper deals with the changes in the borehole that would be caused during annual injection and production cycles from the storage reservoir.
Customer Papers
The fracture of the proximal humerus is the second most common injury to the upper extremity. In severe fractures, surgery may be necessary which can be in the form of a locking plate holding the bones in place. This study examines the effect of including a bonegraft alongside the locking plate. ScanIP and +ScanCAD (Simpleware Ltd) were used to segment the proximal humerus from a CT scan, and to introduce CAD data of the fixation plate and bonegraft. The combined model of image data (proximal humerus) and CADdata (fixation plate, bonegraft) was then meshed in +ScanFE (Simpleware Ltd) were materials and contacts were defined.
Customer Papers
Performance and life in tapered roller bearing is highly influenced by contact pressure distribution in the raceways which is also determined by the contact area and profile geometry of the bearing components (rollers and rings). This complex geometry together with non-Hertzian effects (local yielding, edge effects...) makes impossible a precise analytical calculation of the contact pressure distribution. This contact distribution is evaluated instead by numerical calculations using virtual prototyping techniques (i.e: the finite element method). The use of finite element procedures allows the inclusion on the life calculations of imperfections in the profile finishing as well as misalignment in the axle mounting and angle errors on the raceways.
Customer Papers
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