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Derivation of kinematic relations and finite element stress analysis of flexspline in a harmonic drive gearbox

Derivation of kinematic relations and finite element stress ...

引用

asme 2010 10th biennial conference on engineering systems design and analysis, ESDA2010

作者： Shishesaz, Mohammad Shahid Chamran University Department of Mechanical Engineering Ahvaz Khouzestan Iran

ISBN: (纸本)9780791849187

this article investigates the kinematic relationships in a harmonic drive gearbox with a fixed circular spline. According to derived equations, as well as finite element results on flexspline, the ratio of vertical to horizontal deflection is constant for all values of the applied load. this ratio barely depends on geometric dimensions of the flexspline. According to kinematic relations, the difference in gear teeth of the flexspline and that of circular spline can only take values of 2 or 3. Finite element results, enforces value of 2 to be used. According to the results, flexspline deflection reveals similar behavior to that of a cylindrical shell. this similarity manifests itself in terms of a correlation factor Cf, through which one can find the flexspline deflections ratio using cylindrical shellresults. A complete knowledge on this factor can eliminate any cumbersome work on finite element modeling of the flexspline. More over, using the proposed design curves (based on finite element results), one can calculate the required force for a full engagement of gear teeth without exceeding the bearing stress values of a flexspline, in a typical harmonic drive gearbox. Copyright © 2010 by asme.

关键词： Gear teeth

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SIMULATION OF IMPACT AND FRAGMENTATION WIth thE MESHLESS MEthODS

引用

10th asme biennial conference on engineering systems design and analysis

作者： Kilic, Namik Erdik, Atil Ekici, Bulent Otokar Otomot & Savunma San AS CAE Dept Sakarya Turkey

ISBN: (纸本)9780791849187

High velocity impact and penetration problems include large deformation, erosion, high strain rate dependent nonlinear material behavior and fragmentation. therefore, mesh less methods seem to be ideally suited for the modeling of penetration events as they allow unrestricted deformation and easy tracking of material interfaces and loading histories. In the first part of this study, a brief overview about meshless methods is given. Also the most important features of meshless methods with respect to mesh based approaches are compared. In the second part, numerical model is developed using one of the most frequently used meshless method, Smoothed Particle Hydrodynamics (SPH). 3D numerical simulations are performed on a high performance computer using MPP version of the explicit finite element code LS-Dyna. For reasonable behavior of material response under dynamic loading, Johnson Cook material models for armor steel target and 7,62 armor piercing projectile are derived using SHPB (Split Hopkinson Pressure Bar) test data. SPH computational investigation is compared with available experimental data such as penetration depth and impact crater diameter. For the future work, other potential meshless methods for ballistic impact problems are identified.

关键词： Dynamic testing (Materials) Armor Deformation Finite element analysis Hydrodynamics Particulate matter Simulation Modeling Pressure Computer simulation Computers Erosion Steel Projectiles

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design AND analysis OF ROTARY POSITIVE DISPLACEMENT MECHANISM FOR OIL-LESS COMPRESSION

引用

10th asme biennial conference on engineering systems design and analysis

作者： Roser, Holger Univ Technol Sydney Sydney NSW 2007 Australia

ISBN: (纸本)9780791849187

In this paper, a simple positive displacement mechanism is investigated, which comprises two counter-rotating meshing rotors within a casing. Although considered for various applications more than a century ago, the basic geometry of this mechanism has not been further explored or adapted to modern gas compressor technology. As a fully balanced rotational mechanism operating at uniform angular velocity, potential applications range from pumps to expanders, from slow large displacement to highspeed devices;nonetheless, this research focuses on high-performance oil-less gas compressors as an ideal application. During one complete cycle, the main rotor compresses and discharges the fluid, whilst the secondary rotor seals the compression chamber. Important features of this mechanism are the circular profiles of the rotors, the potential to accommodate large ports for reduced flow losses, and ease of cooling. the simple geometry facilitates a cost-effective means of achieving tight operating clearances between rotors and casing for enhanced sealing without the need for liquid lubricants such as oil. this study and preliminary tests indicate that pressure ratios suitable for standard industrial applications can be obtained over a broad speed range, whilst minimizing friction and flow losses, a major drawback of current technologies. Moreover, two-phase compression and injection of liquids prior to compression have been studied and identified as a means to further improve efficiency and cooling.

关键词： Flow (Dynamics) Rotors Displacement Lubricants Pressure Fluids Sealing (Process) design Cooling Gas compressors Cycles Geometry Pumps Friction Gates (Closures) Compression

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ASSEMBLY CONCEPTS FOR AIRCRAFT CABIN INSTALLATION

引用

10th asme biennial conference on engineering systems design and analysis

作者： Halfmann, Niklas Krause, Dieter Umlauft, Sebastian Hamburg Univ Technol Inst Prod Dev & Mech Engn Design PKT Hamburg Germany

ISBN: (纸本)9780791849187

the development of visionary integration concepts for the aircraft cabin is essential for the reduction of assembly times. In this paper the results of multiple joint research projects between the Hamburg University of Technology and Airbus Operations GmbH are presented. Based on an extensive as-is analysis, first concepts were set up applying prevalent design for assembly guidelines and resulting in the definition of top-level-requirements for the design and installation processes of aircraft cabins. Further research contained an analysis of the assembly processes of the cabin components in relation to their product structures. Concepts were generated using the PKT own developed modularization method. the method considers all relevant strategic perspectives of a company, one of which is the assembly. At the end a final assembly line optimized concept was defined. the concept mainly concentrates on the over-head storage bins, the so called Hatracks, the passenger service units (PSUs) and the lining panels. Since in the common way, all components are separately handled and mounted, their installation turned out to be the bottle neck of the assembly process. According to the developed measures, the degree of pre-assembly is raised. thereby time intensive assembly tasks are parallelized and performed independently outside of the aircraft in earlier production phases. Due to the geometric dimensions and weight of the resulting cabin modules in this context, the utilization of a handling device becomes obligatory. the positive effects on the overall lead time reduction are evaluated. For all developed concept aspects technology demonstrators were constructed representing the overall installation process. Tests were performed in order to validate the estimated benefits.

关键词： Manufacturing Aircraft Dimensions design Storage Assembly lines Linings (Textiles) Weight (Mass)

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A new design for Cassino Hexapod Robot

A new design for Cassino Hexapod Robot

引用

asme 2010 10th biennial conference on engineering systems design and analysis (ESDA2010)

作者： Rodríguez, Nestor Eduardo Nava Lorente, Luis Moreno Carbone, Giuseppe Ceccarelli, Marco Spain Italy

ISBN: (纸本)9780791849170

We present the design process of a new low-cost easy-operation Cassino Hexapod robot. In a recent past, research activities have been carried out for developing a six-legged robot at LARM (LAboratory of Robotics and Mechatronics) of Cassino University in Italy. the robot designs have been based on suitable mechanism structures and architectures that can be easy operated by a commercial on-off logic device. the first prototype is composed of modular legs with three degrees of freedom (DOF). A second prototype of a hexapod leg presents two links and two DOFs. the new prototype Cassino Hexapod robot has two DOFs, such as, one for pitch movement that drives an articulated mechanism and other for yaw movement. Additional peculiarity of the leg design is that the foot is designed as a powered wheel with the possibility to regulate the velocity and force at the contact during the support phases of the leg. Simulation results of the proposed design operation of the new hexapod robot are reported with the aim of characterizing both operation performance and design features. © 2010 by asme.

关键词： Logic devices

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ON thE USE OF POD-MODELS FOR CONVECTIVE FLOW IN A GROOVED CHANNEL

ON THE USE OF POD-MODELS FOR CONVECTIVE FLOW IN A GROOVED CH...

引用

10th asme biennial conference on engineering systems design and analysis

作者： Cadirci, Sertac Gunes, Hasan Istanbul Tech Univ Fac Mech Engn TR-80626 Istanbul Turkey

ISBN: (纸本)9780791849163

In this study we develop Proper Orthogonal Decomposition (POD) models for combined steady and transitional (quasi-periodic) convective air flows in a grooved channel with periodic boundary conditions. the grooved channel is appropriately mounted with constant heat flux sources. the constructed POD models for the flow and temperature fields are used in order to predict the off-design flow conditions. Considering the grooved channel geometry (with the height of the heat source H = 2.3 cm and the distance between the heat sources L = 3.0 cm), we form a database using a combination of three distinct databases. thus we could compare the ability of a POD model applied to the combined database consisting of various flow regimes. the first database consists of steady flow fields with varying Reynolds number up to Re = 230. the second and third databases include instantaneous snapshots of a periodic flow field at Re = 300 and snapshots of a quasi-periodic (chaotic) flow field at Re = 1000 respectively. then, the combined database is used to perform the POD analysis and extract the POD modes. the modes of the flow and temperature fields are used for off-design reconstructions. the performance of POD model for off-design conditions is evaluated. the mode coefficients are interpolated by kriging to predict off-design conditions. We show that POD model can be used as a useful tool to predict the flow and heat transfer at off-design conditions and to solve inverse design problems in thermo-fluids.

关键词： Heat transfer Geometry Flow (Dynamics) Databases Air flow Reynolds number Heat design Boundary-value problems thermofluids Heat flux Temperature

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An investigation on micro slip flows in micro channels

引用

asme 2010 10th biennial conference on engineering systems design and analysis (ESDA2010)

作者： Salehi, Gh. Reza JalaliBidgoli, Masoud ZeinaliDanaloo, Saeed HasanZadeh, Kazem Mechanical Engineering Faculty Islamic Azad University Noshahr Branch Noshahr Iran Mechanical Engineering Faculty University of Tehran Tehran Iran Mechanical Engineering Faculty K.N. Toosi university of Technology Tehran Iran

ISBN: (纸本)9780791849194

In this paper, distributions of velocity and flow rate of micro channels are studied. Moreover, the parameters which influence them were also discussed, as well as their effects and relevant curves. In the Analytical study, the governing equation in specific micro flows is obtained. this equation is specifically investigated for slip flow in two micro parallel plates (micro channel). At the next step numerical representation shows the influence of the related parameters in micro channel flow such as Knudsen number, thermal-accommodation coefficient, mass flow rate ratio and pressure ratio (outlet to inlet), Tangential Momentum Accommodation Coefficient with relative curves, and flow rate distribution in slippery state to no slip state has been compared as the another part of this solution. Finally, the results of investigating parameters and dimensionless numbers in micro channels are reviewed. © 2010 by asme.

关键词： Flow rate

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Numerical simulation of elastic and thermoelastic wave propagation in two-dimensional classical and generalized coupled thermoelasticity

引用

asme 2010 10th biennial conference on engineering systems design and analysis (ESDA2010)

作者： Hosseinizad, S.K. Komeili, A. Akbarzadeh, A.H. Eslami, M.R. Department of Mechanical Engineering Amirkabir University of Technology Tehran Iran Academy of Sciences ME Dept. Amirkabir Univ. of Tech. Tehran Iran

ISBN: (纸本)9780791849163

this study concentrates on the simulation of elastic and thermoelastic wave propagation in two-dimensional thermoelastic regions based on the classical and generalized coupled thermoelasticity. A finite element scheme is employed to obtain the field variables directly in the space and time domains. the FE method is based on the virtual displacement and the Galerkin technique, which is directly applied to the governing equations. the Newmark algorithm is used to solve the FE problem in time domain. Solving 2D coupled thermoelasticity equations leads to obtain the distribution of temperature, displacement and stresses through the domain. the problem is solved for two different type of boundary conditions (BCs), and the behavior of temperature, displacement and stress waves according to these BCs and based on the classical and generalized coupled thermoelasticity theories are shown and compared with each other. Several characteristics of the thermoelastic waves in two-dimensional domains are discussed according to this analysis. Copyright © 2010 by asme.

关键词： Time domain analysis

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AN AERODYNAMIC design AND OPTIMIZATION OF A HEAVY TRUCK FOR DRAG REDUCTION

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10th asme biennial conference on engineering systems design and analysis

作者： Selenbas, Bugra Gunes, Hasan Gocmen, Kenan Bahceci, Uygar Bayram, Bertan Istanbul Tech Univ Dept Mech Engn TR-34437 Istanbul Turkey

ISBN: (纸本)9780791849170

In this paper, a computational fluid dynamics (CFD) study is carried out in an effort to design and optimize the cabin geometry and its various parts for drag reduction that include the side deflectors, the mirrors and the sun visor. For the validation of computational results, an experimental investigation using a 1/5 scale truck model has been carried out in a wind tunnel. the aerodynamic force as well as the surface-pressure point measurements carried out at selected wind speeds. the flow visualizations using smoke and oil were also performed. With the experimental results, the basic characteristics of flow over the cabin geometry (including the flow separation locations) are compared with the CFD results. the both steady and unsteady CFD simulations are performed. the comparison of steady/unsteady results reveals that the time-averaged unsteady flow characteristics are practically the same as the steady calculations for design purposes. In addition to CFD simulations involving the actual (real) truck cabin geometry, for the optimization of the specific cabin accessories, (e.g., side deflectors and mirrors), a generic truck model is also used for CFD analyses. the optimized side deflector geometry (e.g., the ratio of the air inlet and outlet area), and the optimum form of the mirrors for drag reduction have been realized by numerical investigations.

关键词： Aerodynamics Mirrors Simulation Flow (Dynamics) Wind velocity Smoke Optimization Unsteady flow Fluid-dynamic forces Trucks Pressure engineering simulation Wind tunnels design Flow separation Flow visualization Drag reduction Geometry Computational fluid dynamics

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design and analysis of a foot contact sensor for posture control of a biped robot

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asme 2010 10th biennial conference on engineering systems design and analysis (ESDA2010)

作者： Şafak, Koray K. Baturalp, T. Batuhan Department of Mechanical Engineering Yeditepe University Ataşehir Istanbul 34755 Turkey

ISBN: (纸本)9780791849170

Development of a planar biped robot is currently underway at Yeditepe University. the robot consists of lower extremities with a torso that are designed at anthropomorphic dimensions. this study describes the design and testing of a foot contact sensor for the biped robot. Dynamic stability of a biped robot is commonly measured by the zero moment point (ZMP) method. Experimentally, ZMP is measured by multi-component force/torque sensors. Due to their low cost and ease of use, force sensitive resistors (FSR) are used to build a foot contact sensor for the biped robot. Four FSRs are mounted at the corners of the robot's foot to measure the ground reaction force and its moment. Hence, by utilizing the data from the foot contact sensors, a real-time ZMP computation scheme can be implemented. the performance of the designed foot contact sensor is presented by numerical simulations of a planar biped robot's postural stability control. Results indicate that reaction force computation by the FSR based force sensors is a viable method to monitor postural stability of biped robots. Force sensors and their electronics are currently being built to be used for the actual tests. © 2010 by asme.

关键词： Machine design

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