scholarly journals Evaluation of Mechanical Strength Characteristics of Double Ducted Unmanned Amphibious Aerial Vehicle using Finite Element Analysis

2019 ◽  
Vol 4 (2) ◽  
pp. 420-431 ◽  
Author(s):  
Gokul Raj P. ◽  
Balasubramanian Esakki ◽  
Surendar Ganesan
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Land Surface ◽  
Water Surface ◽  
Structural Strength ◽  
Strength Characteristics ◽  
Element Analysis ◽  
Vehicle Structure ◽  
Payload Capacity ◽  
Aerial Vehicle

Unmanned Aerial Vehicles are extensively exploited for diverse applications importantly surveillance, defence and military, photography. Development of unmanned amphibious vehicle with integrating features of hovercraft principles and multirotor to navigate along and above the water surface, land surface and flying in the air is challenging demand. This article presents conceptual design of amphibious vehicle for the payload capacity of 7 kg with an endurance of 20 minutes and provision for mounting water sampler to collect water samples in remote water bodies. Structural strength characteristics of each part of the amphibious vehicle and integrity of same are analysed by Finite Element Analysis. FEA results indicated that the designed amphibious vehicle structure is well within the stress limit and minimal displacement is obtained. Based on structural analysis materials for various parts of the amphibious vehicle are determined and integrated structure is analysed.

Finite Element Analysis of Structural Strength of Concrete Mixing Truck’s Frame

2014 ◽  
Vol 945-949 ◽  
pp. 1143-1149
Author(s):  
Hai Xia Sun ◽  
Hua Kai Wei ◽  
Xiao Fang Zhao ◽  
Jia Rui Qi
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Finite Element Model ◽  
Structural Strength ◽  
Element Model ◽  
Basic Element ◽  
Operating Conditions ◽  
Frame Structure ◽  
Element Analysis ◽  
The Finite Element Model

The finite element model of the concrete mixing truck’s frame is builded by using shell as basic element, and the process of building the finite element model of the balance suspension is introduced in detail. Based on this, frame’s stress on five types of typical operating conditions are calculated by using the finite element analysis software, NASTRAN, and results can show the dangerous position and the maximum stress position on the frame. The analysis result on structural strength can provide the basis for further improving the frame structure.

Fatigue Strength Study on Radial Bogie Vice Frame Based on Finite Element Analysis

2015 ◽  
Vol 723 ◽  
pp. 96-99
Author(s):  
Xiao Wei Wang ◽  
Mao Xiang Lang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Fatigue Life ◽  
Fatigue Strength ◽  
Structural Strength ◽  
Simulation Software ◽  
Experimental Result ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
The Stability

The vice frame bears and transfers the forces and loads between the bogie and the vehicle body.The strength of the vice frame relates directly to the stability and smoothness of the vehicle. In this study, finite element analysis is utilized first to analyse the structural strength and fatigue life of the vice frame, and the recognize the weak parts of its structure in order to enhance its structural strength in the following design work.The finite element analysis is performed on a simulation software Ansys. Then an experiment is designed to test the fatigue strength of the vice frame. The experimental result indicates that the fatigue strength of the object corresponds to the standards and the finite element analysis has high feasibility in solving this kind of problem.

Analysis of Vibration Characteristics of Transport Utility Vehicle by Finite Element Method

2019 ◽  
Vol 11 (1) ◽  
Author(s):  
Vikas Radhakrishna Deulgaonkar
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Dynamic Behaviour ◽  
Ride Comfort ◽  
Vibration Characteristics ◽  
Surface Model ◽  
Element Analysis ◽  
Track Width ◽  
Vehicle Structure ◽  
Utility Vehicle

Present work deals with the design and analysis vibration characteristics for transport utility vehicle. The transport utility vehicle is designed using automotive industry standards. The dynamic behaviour of vehicle depends on the selection of overall dimensions, wheel base, track width, overall height and width that are decided using central motor vehicle rules. The selected dimensions for vertical and horizontal pillar members of the transport bus are modified to enhance the strength, stiffness and stability of the superstructure during travel. This increased stability enhances the ride comfort and passenger safety. Analysing the effect of utilizing manual meshing in complex areas of a transport utility vehicle for vibration analysis and passenger ride comfort has also been carried out. Modal analysis to evaluate the dynamic behaviour of transport utility vehicle model is also carried. Further with the use of finite element analysis deflection vehicle structure is evaluated. The outcomes from the analysis are compared with the behaviour of chassis mounted platform in dynamic conditions and are found in close correlation. The vehicle structure behaves as a single entity in dynamic situations, so surface model is prepared. Element selection for the finite element analysis is carried by considering plane stress condition. Two-dimensional quadrilateral shell elements are extensively used for meshing of the computer model of the vehicle structure. Complex areas in the optimised vehicle structure are meshed using relevant combination of quads and trias. The values of vector sum displacement and frequencies are found to be in good agreement with the experimental ones.

Strength Analysis and Structural Design Improvement of the Drill Floor of a Self-Elevating Drilling Unit

2015 ◽  
Author(s):  
Qi Wang ◽  
Ji Zeng ◽  
Yong Yang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Structural Design ◽  
Structural Strength ◽  
Element Analysis ◽  
Environmental Loads ◽  
Design Improvement ◽  
The Finite Element Analysis ◽  
Floor Structure ◽  
Drilling Unit

The self-elevating drilling units are widely used in the offshore industry for oil and gas exploration. The drill floor structure is the main part of the drilling package for a self-elevating drilling unit due to its key function. Its structural strength checking is of great significance on account of the special structure features and the complex combined loading conditions it suffers. The sufficient structural strength of the drill floor is the base and guarantee for safe drilling and extraction. The finite element method was applied to calculate the structural strength of the drill floor directly considering different load cases which was the combination of environmental loads, permanent loads, variable function loads, and reaction forces from structures and equipments. Total forty load cases were set in the finite element analysis. A detailed finite element model without simplification of the drill floor was built correctly so that it can show the accurate stiffness of the real structure. Based on this model, the design method and the design criterion of the drill floor were described in detail. The environmental loads were calculated according to ABS MODU rules. The influence of the direction of the environmental loads on the drill floor were studied and concluded. Since the drill floor was not just welding with the cantilever beam, the boundary conditions were also particularly introduced owning to the complex connection between them. After finite element analysis and calculation, the stress distribution of the whole drill floor which includes the main girders and derrick supports were obtained. The locations with high stress were found so those places should be paid more attention. The curves which show the stress variation according to the environment loading direction were drawn and their characteristics were found. The load case and the load which have the main effect on drill floor structure were found. As a result, the suggestions for design improvement were put forward for the structural design, and the finite element analysis was run again to test and verify the design improvement. This paper can provide meaningful guidance for the future design of the drill floor.

A Whole Ship Finite Element Analysis With the Input of Nonlinear Wave Loads in the Irregular and Multi-Directional Waves

2011 ◽  
Author(s):  
Yoshitaka Ogawa ◽  
Masayoshi Oka
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Nonlinear Wave ◽  
Structural Strength ◽  
Wave Loads ◽  
Rational Analysis ◽  
Element Analysis ◽  
Wave Condition ◽  
Wave Pressure ◽  
Analysis System

Authors developed a whole ship finite element analysis system from a nonlinear wave loads to a structural strength at real sea state. A methodology for the rational analysis of structural strength is examined. Firstly, wave pressure, which is the input for the present whole ship finite element analysis and has much effect on the accuracy of a whole ship analysis, is validated through the comparison with experiments. It is confirmed that the present computation can estimates wave pressure in various wave condition accurately. Secondly, the whole ship finite element analysis system by the combination with the computation of nonlinear wave pressure is verified. It is verified that the present method can evaluate a structural response in irregular waves with taking account of the nonlinear effect of ship motions and slamming induced impact loads explicitly. Finally, through the structural analysis in various ship forward speed and wave condition by means of the present computation, the importance to assess a structural strength taking account of the effect of operational condition is clarified.

Structural Optimization Design of Anti-Collision Sealing Cylindrical Rubber Cushion

2012 ◽  
Vol 201-202 ◽  
pp. 894-897
Author(s):  
Jun Liu ◽  
Bao Shou Sun ◽  
Jian Nan Cao
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Optimal Design ◽  
Water Surface ◽  
Optimization Design ◽  
Feasibility Analysis ◽  
Ansys Software ◽  
Element Analysis ◽  
Good Ability ◽  
Air Cushion

At present, it is inconvenient for use due to huge volume of common inflatable rubber fender. This paper introduces a design of cylindrical rubber sealing cushion which can be applied to various occasions to protect ships, dock and pier facilities. The key of air cushion technique is that it can produce a large displacement to buffer deformation and to reduce the exchange of energy. It plays a role to increase the time of collision, and then reduces the force of collision. Meanwhile, it also has good ability to adapt the tilted contact and it can float on the water surface, etc. This paper makes a feasibility analysis and strength calculation by doing theoretical calculation, and then making a force-test simulation by using ANSYS software, and do some structure optimal design according to the results of finite element analysis.

scholarly journals Fatigue Test of Low-Cost Flexible-Shank Monolimb Trans-Tibial Prosthesis

2006 ◽  
Vol 30 (3) ◽  
pp. 305-315 ◽  
Author(s):  
Winson C. C. Lee ◽  
Ming Zhang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Fatigue Test ◽  
Structural Integrity ◽  
Static Load ◽  
Fatigue Testing ◽  
Structural Strength ◽  
Low Cost ◽  
Element Analysis ◽  
Thermoplastic Material

Monolimb refers to a kind of trans-tibial prostheses with the socket and shank moulded into one piece of thermoplastic material. If properly designed, the shank of a monolimb can deflect which may compensate for the lost ankle plantarflexion and dorsiflexion to some extent. However, provision of shank flexibility is usually accompanied by reduced structural strength of the entire prosthesis. In the recent work using finite element analysis and the Taguchi method, the dimensions of the shank for the monolimb were derived which aimed at giving high shank flexibility and reasonable strength to resist static load. Yet, fatigue testing has not been performed. Fatigue failure may happen when a relatively low level of load is applied repeatedly. This study aimed to document the fatigue life of two flexible-shank monolimbs, by applying cyclic force of 800 N at the forefoot region for 500,000 cycles. Results showed that the design of the foot bolt adaptor played an important role in the structural integrity of the monolimb. One monolimb completed the fatigue test of 500,000 cycles without visual material yield, but with 3.8° change in dorsiflexion angle when the load was removed.

Application of the Discrete Element Method (DEM) to Evaluate Pipeline Response to Slope Movement

2016 ◽  
Author(s):  
Abdelfettah Fredj ◽  
Aaron Dinovitzer ◽  
Amir Hassannejadasl ◽  
Richard Gailing ◽  
Millan Sen
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Discrete Element Method ◽  
Land Surface ◽  
Numerical Models ◽  
Discrete Element ◽  
Slope Movement ◽  
Ground Movement ◽  
Element Analysis ◽  
Element Method

The long linear nature of buried pipelines results in the risk of interaction with a range of geotechnical hazards including active slopes and land surface subsidence areas. Ground movement induced by these geotechnical hazards can subject a pipeline to axial, lateral flexural, and vertical flexural loading. The techniques to predict pipeline displacements, loads, stresses or strains are not well described in design standards or codes of practice. The results of geotechnical site observation, successive in-line inspection or pipeline instrumentation are used to infer pipeline displacement or strain accumulation and these techniques are often augmented through the application of finite element analysis. The practice of using finite element analysis for pipe-soil interaction has developed in recent years and is proving to be a useful tool in evaluating the pipeline behavior in response to ground movement. This paper considers pipeline response to geotechnical hazard-induced loading scenarios related to slope movement transverse to the pipeline axis. The details of the three-dimensional LS-DYNA-based BMT pipe-soil interaction model employing a discrete element method (DEM) are presented in this paper. The validation of the numerical models through comparison with medium-scale physical pipe-soil interaction tests are described to demonstrate that the models are capable of accurately simulating real world events. The models are further calibrated for nominal soil types to replicate the pipe-soil load displacement properties outlined in ASCE guideline recommendations by developing responses that closely agree with these results from the physical trials and engineering judgement. The utility of advanced pipe-soil interaction modelling in supporting strain-based pipeline integrity management or design is demonstrated by presenting the results of geotechnical hazard numerical simulations. These simulations are used to describe the sensitivity of pipeline displacements and strains to the demands of these geotechnical events and develop relationships between the geotechnical event key parameters and pipeline response.

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