Display:

Results

Viewing 31 to 60 of 3404
2015-04-14
Technical Paper
2015-01-0151
Sergey P. Gladyshev, Irina Okrainskaya, Pavel Gladyshev
Abstract The purpose of this paper is to investigate opportunity to create a new type AC induction motor with the salient pole rotor (without winding) and both winding AC excitation and short circuited placed on the stator. There are some advantages in this design: The suggested design has a cold rotor. The stator short circuited and excitation windings are easier for cooling. The rotor has reduced weight in compare with regular induction motor rotor. The short circuit winding can be used for the current control like in the regular induction wound-rotor machines. In this case, the problem maintenance of the slip rings is eliminated. In this paper, we discuss theoretical opportunity for realization the induction mode operation in two and three phase machines. As a base for this, it serves the analyses operation of one phase machine. This analysis is fulfilled in comparison with regular induction motors with short circuited and wound-rotor windings.
2015-04-14
Technical Paper
2015-01-0471
Apurva Gokhale, Sumeet Parashar, Saket Kansara
Abstract Need for accounting Robustness and Reliability in engineering design is well understood and being researched. However, the actual practice of applying robustness and reliability methods to high fidelity CAE based simulations, especially during optimization is just starting to gain traction in last few years. Availability of computing power is helping the use of such methods, but, at the same time the demand for modeling stochastic behavior with high fidelity CAE simulations and considering large number of stochastic variables still makes it prohibitive. Typically, Robust Design Optimization (RDO) formulations calculate mean and standard deviation of responses based on sampling. On the other hand Reliability Based Design Optimization (RBDO) formulations have been using methods like First Order Reliability Method (FORM) or Second Order Reliability Method (SORM) which require nested optimization to evaluate joint probability distribution and reliability factor.
2015-04-14
Journal Article
2015-01-0146
Salah Alhasia, Sharif Gindy, Selin Arslan, Badih Jawad, Chris Riedel
As the need for super high speed components (pumps, motors, etc) continue to grow rapidly, so does the need to make measurements at speeds higher than ever before. Bearings are a major component in any rotating system. With continually increasing speeds, bearing failure modes take new unconventional forms that often are not understood. Such measurements are impossible if bearings fail to perform. This paper will address the dynamic modes a bearing passes through and the potential failure modes associated with each. A review of the state of the art of current failure modes will be given, and then a hypothesis on some new failure modes associated with particular speeds will be discussion. The paper will also describe an apparatus that was designed especially to study these phenomena. Range of speed studied is 0- 60,000 rpm. Preliminary measurements indicated that this range breaks into three different zones, each with its own unique possible failure characteristics.
2015-04-14
Technical Paper
2015-01-0582
Deepak Ranjan Bhuyan, Sreekanth Netapalli, Sathya Dev, Soundarya Srinivasan
Springback prediction is challenging for Automotive Industry due to use of High Strength Steel (HSS). Automotive OEMs are working to reduce the springback effect of sheet metal stampings caused due to elastic behavior of materials with the help of changes to manufacturing process and part geometry. Use of HSS has grown due to improved passive safety (higher strength) and reduced vehicle weight. This on the other hand tends to intensify the springback effect, as the HSS materials have a higher elastic limit. Recent development in FEA studies made it possible for the industry to rely on stamping simulation. There is always a gap between the springback predicted from stamping simulation and the actual stamped part. Currently FEA technique is not able to accurately predict this gap. The objective of this study is to minimize this gap using DFSS method for predicting the springback and optimizing the simulation parameters with the help of LS-Dyna FEM tool.
2015-04-14
Journal Article
2015-01-0132
Sibi Visht Sankara Narayanan, Diane Peters
Typically, when someone needs to perform occasional towing tasks, such as towing a boat on a trailer, they have two choices. They can either purchase a larger, more powerful vehicle than they require for their regular usage, or they can rent a larger vehicle when they need to tow something. In this project, we propose a third alternative: a trailer with an on-board power supply, which can be towed by a small vehicle. This system requires a means of sensing how much power the trailer’s power supply should provide, and an appropriate control system to provide this power. In this project, we design and model the trailer, a standard small car, and the control system, and evaluate the concept’s feasibility. We have selected a suitable power source for the trailer, a DC motor, coupled directly to the trailer’s single drive wheel, which allows us to dispense with the need for a differential.
2015-04-14
Technical Paper
2015-01-0431
KI Woo Sung, Jong Gurl Kim, Dae-Un Sung, Hye Mi Kim
HKMC has implemented the term of guarantee as 10 years and 100,000 miles for North American power train in order to expand a share in the North American market in 1999. Warranty data of 10 years and 100,000 miles for North American power train is 10-year field data of sales volume in North America which is important to confirm the durability of power train parts. In addition, it is meaningful that HKMC has collected data for ten years first in the world. However, there are some difficulties in warranty data analysis because it is hard to access to warranty repair data containing life information of parts and data is not opened to the public. Although the importance of warranty data has been recognized, the accuracy of data and analysis methods have not been systematically studied in the automobile business world. Unlike warranty data on electronics, failure time of automobile warranty data is given in the two dimensions with mileage and duration of use.
2015-04-14
Journal Article
2015-01-0501
Dengfeng Wang, Rongchao Jiang
The cost of fuel for commercial trucks takes up a great proposition in the total vehicle operating costs. In order to improve the power performance and fuel economy of a domestic self-dumping truck, an optimization matching method of the powertrain system was presented in this paper. A vehicle performance simulation model of this self-dumping truck was established using AVL-Cruise software. Then the power performance and fuel economy simulations were executed according to China National Standard GB/T 12543-2009 “Acceleration performance test method for motor vehicles” and GB/T27840-2011 “Fuel consumption test methods for heavy-duty commercial vehicles”. Moreover, the simulation results were compared with the road test results, which were measured on proving ground, to verify the validity of the vehicle performance simulation model.
2015-04-14
Journal Article
2015-01-0420
Musarrat Jehan, Efstratios Nikolaidis
There is randomness in both the applied loads and the strength of a system. Therefore, to account for the uncertainty, the safety of the system must be quantified using its reliability. Monte Carlo Simulation (MCS) is widely used for probabilistic analysis because of its robustness. However, the high computational cost limits the accuracy of MCS. Haftka et al. [2010] developed an improved sampling technique for reliability assessment called Separable Monte Carlo (SMC) that can significantly increase the accuracy of estimation without increasing the cost of sampling. However, this method was applied to time-invariant problems involving two random variables. This paper extends SMC to problems with multiple random variables and develops a novel method for estimation of the standard deviation of the probability of failure of a structure. The method is demonstrated and validated on reliability assessment of a wind turbine under turbulent wind loads.
2015-04-14
Journal Article
2015-01-0425
Monica Majcher, Zissimos P. Mourelatos, Vasileios Geroulas, Igor Baseski, Amandeep Singh
Using the total probability theorem, we propose a method to calculate the failure rate of a linear vibratory system with random parameters excited by stationary Gaussian processes. The response of such a system is non-stationary because of the randomness of the input parameters. A space-filling design, such as optimal symmetric Latin hypercube sampling or maximin, is first used to sample the input parameter space. For each design point, the stationary Gaussian output process is easily characterized using a spectral decomposition approach and the constant failure rate is efficiently estimated using MCS over a short time. A Kriging metamodel is then created between the input parameters and the corresponding failure rates allowing us to estimate the constant failure rate for any set of input parameters. The total probability theorem is finally applied to calculate the time-dependent failure rate or equivalently the time-dependent probability of failure of the dynamic system.
2015-04-14
Journal Article
2015-01-0438
Ashley Lehman, Vesselin Stoilov, Andrzej Sobiesiak
This paper describes the application of the Fourier Amplitude Sensitivity Test (FAST) to investigate the thermal system performance of vehicle underbody components which are affected by variation in design parameters. The results from this study will pinpoint the design parameters which offer the greatest opportunity for improvement of thermal system performance and reliability. In turn, this method can save engineering time and resources. A mathematical model was first developed using Matlab for a vehicle underbody system consisting of a muffler, heat shield, and underbody panel. There were a number of input parameters identified. Some of these parameters deviate from their nominal value due to environmental factors, wear and ageing, or variation in the manufacturing process. These parameters include the emissivity of the muffler surface, the view factors between each component, and the temperature and velocity of the ambient air.
2015-04-14
Journal Article
2015-01-0495
Shohei Mikami, Georgi Chakmakov
Designing a lightweight and high-strength engine product is universally important from the standpoints of fuel consumption, power, and cost; however, it is difficult to find an optimal solution accomplishing these characteristics in products such as the cylinder heads that are simultaneously affected by a thermal load and various mechanical loads. We focused on an optimization means called “nonparametric optimization” and created a method of cylinder head design that utilized it. Our optimization process was divided into topological optimization and shape optimization. In the topological optimization process, we searched for a structure with the highest theoretical stiffness in the given design space. This provided an efficient structure when pursuing both lightweight and high-strength characteristics in the subsequent shape optimization process. Strain energy and displacement of the combustion chamber were used as the parameters for controlling stiffness.
2015-04-14
Journal Article
2015-01-0489
Jason Rogers
A Catia-and-Excel-based predictive tool was developed to predict trunk spring movement for preventing recurrence of a noise problem. While effective, the tool could not completely explain measured CBU results. Since design data was used for the study, it was hypothesized that the difference between study and actual results was related to tolerance variation on the actual vehicle. Using Siemens VSA software, the vehicle was built and simulated virtually with tolerances using a Monte Carlo model. The study found that the hypothesis was correct; tolerance variation was fully responsible for the differences. The study also allowed accurate prediction of failure rates.
2015-04-14
Journal Article
2015-01-0488
Andreea Elena Balau, Dennis Kooijman, Ignacio Vazquez Rodarte, Norbert Ligterink
The goal of this work is to develop a tool that stochastically generates drive cycles based on measured data, with the purpose of testing light duty vehicles in a simulation environment or on a test-bench for type approval testing. The WLTC database was used as input data. This database was created with the help of a number of European countries that collaborated and provided real world driving measurements. Consequently cycles that contain typical accelerations per velocity and road types are generated, such that these cycles are representative to real driving behaviour. The stochastic drive cycle generator is developed in Matlab and is based on Markov processes. Two different stochastic generators are used: one for generating the road type and one for generating the vehicle acceleration.
2015-04-14
Journal Article
2015-01-0500
Emilio Larrodé, Alberto Torne, Alberto Fraile
This paper is collaboration between the Research Group on Sustainable Means of Transport and Systems (SMITS) of the University of Zaragoza (Spain) and the Spanish company, Zytel Automotive S.L. (ZYTEL). The analysis and decision making on design, behaviour and use of a prototype electric vehicle is the main focus has been pursued in this paper. It was modelled a prototype electric vehicle, called Gorila EV, as from the software tool Adams/Car (MSC Software Corporation). The way it decided to tackle this paper was by Computer Aided Engineering (CAE). Conduct an analysis of the vehicle by CAE allows increasing the quickness and convenience when getting results and reduce costs incurred testing with real prototypes. In this study it considers urban driving, where the vehicle trajectory is constrained by the infrastructure (road signs) and other vehicles (traffic).
2015-04-14
Technical Paper
2015-01-0502
Zhicheng Xu, Gangfeng Tan, Xingzhi Sun, Yongqiang Ge, Min Hua, Haobo Xu
For the thin ice on the road in winter, the traditional road deicing vehicle relies on mechanical and chemical methods of melting ice with inefficiency. Above methods have insidious influence on the environment and may be inclined to damage the pavement. The thermal deicing vehicle has been adopted in recent years. Although its effect is favorable, the deicing speed is slow with high energy consumption. This study adopts the method of combination of microwave and vapor. The de-icing action is produced in both the top surface and the bottom surface of the ice layer at the same time which could speed up the melting of the ice. First of all, the mathematical model of surface melting process between the ice and road intersections was established according to the microwave heating characteristics.
2015-02-25
Article
Delcam’s 2015 version of its PowerINSPECT inspection system includes automatic collision avoidance, faster import of large CAD files, quicker preparation of longer inspection reports, and improved display of results from point-cloud data, plus many other customer-requested enhancements.
2015-02-24
WIP Standard
AS9146
Develop a single requirements standard for Foreign Object Damage/Debris 9FOD) Prevention.
2015-02-24
WIP Standard
AS9147
Parts that are declared as unsalvageable are difficult to trace from the workshop to the destruction/recycling area
2015-02-19
Article
Conventional CT scanners cannot accommodate long or bulky aircraft components.
2015-02-17
WIP Standard
AMS2355L
This specification covers quality assurance sampling and testing procedures used to determine conformance to applicable specification requirements of wrought aluminum alloy and wrought magnesium alloy mill products (except forging stock), and includes quality assurance and testing procedures for rolled, forged, and flash welded rings (See 8.3). Requirements are specified in inch/pound units.
2015-02-13
WIP Standard
ARP4955B
The purpose of this SAE Aerospace Recommended Practice (ARP) is to establish guidelines for the measurement of static and dynamic characteristic properties of aircraft tires. It is intended as a general guide toward standard practice, but may be subject to frequent changes to keep pace with experience and technical advances.
2015-02-12
Article
NASA has expanded its use of Exa's PowerFLOW software for the simulation of concepts to reduce aircraft noise within NASA's Environmentally Responsible Aviation project.
2015-02-11
Article
At the McKinley Climatic Laboratory at Eglin AFB, an F-35 will ultimately be tested in all the meteorological conditions representative of those locations from which it will operate, ranging from the heat of northern Australia to the bitter cold of the Arctic Circle.
2015-02-05
Standard
AS13003
This standard defines the minimum requirements for conducting Measurement Systems Analysis (MSA) for variable and attribute assessment on characteristics as defined on the drawing or specification. It does not define the detailed analytical methods for each type of study as these can be found in existing published texts (see Section 2 for guidance).
2015-02-03
Article
LaVision’s internal combustion optical sensor product family provides a series of techniques for the measurement of quantitative, in-cylinder, engine-relevant values.
2015-02-03
Article
Intertek recently acquired an ETS Solutions vibration and mechanical shock system that will enable the company to double its existing capacity on high payload testing.
2015-02-03
WIP Standard
AMS2770M
This specification specifies the engineering requirements for heat treatment, by part fabricators (users) or their vendors or subcontractors, of parts (See 8.8.1). It also covers heat treatment by warehouses or distributors converting raw material from one temper to another temper (See 1.3 and 8.5). It covers the following aluminum alloys: 1100, 2004, 2014, 2017, 2024, 2098, 2117, 2124, 2219, 2224, 3003, 5052, 6013, 6061, 6063, 6066, 6951, 7049, 7050, 7075, 7149, 7178, 7249, 7475
2015-01-23
WIP Standard
AMS2801C
This specification covers the engineering requirements for heat treatment by part fabricators (users) or their vendors or subcontractors, of parts (See 1.1.2) made from the following titanium alloys: Commercially Pure 6Al-4V(ELI) 3Al-8V-6Cr-4Mo-4Zr 3Al-2.5V 6Al-6V-2Sn 13V-11Cr-3Al 5AI-2.5Sn 6Al-2Sn-4Zr-2Mo 10V-2Fe-3Al 8Al-1Mo-1V 6AI-2Sn-4Zr-6Mo 15V-3Cr-3Al-3Sn
2015-01-14
Technical Paper
2015-26-0074
Dhiyaneswar Rani, A K Saravanan, Mohammad Rafiq Agrewale, B Ashok
Abstract Material handling is a major section in all the industries especially for delicate and huge components. Here in this industry they are using pneumatics system to tilt the component for certain angle so that operator will be able to do the further operation in the line. Pneumatic system needs compressed air for running the system, which in turn requires electricity to compress the air using an air compressor. Due to frequent power shutdowns many industries are facing problem to run their manufacturing unit peacefully. As an alternate they are using generators which require fuel to generate power. This adds excess cost for manufacturing the products and demand for fuel is also increasing day by day. So to avoid all this problem with a one step solution, dependability of energy resources has to be minimized. For avoiding the usage of energy resources the usage of pneumatics and compressed air has to be reduced.
2015-01-14
Technical Paper
2015-26-0101
Arun Sivasubrahmaniyan, Abhishek Kumar Jaishwal, Girish R Warrier, Sriram Tharaneetharan, Kalyan Hatti
Abstract This paper describes a methodology for design and development of On-Board Diagnostic system (OBD) with an objective to improve current reliability process in order to ensure design & quality of the new system as per requirement of commercial vehicle technology. OBD is a system that detects failures which adversely affect emissions and illuminates a MIL (Malfunction Indicator Lamp) to inform the driver of a fault which may lead to increase in emissions. OBD provides standard and unrestricted access for diagnosis and repair. Below given Figure 1 shows the working principle of OBD system. The exhaust emission of a vehicle will be controlled primarily by Engine Control Unit (ECU) and Exhaust Gas After Treatment Control (EGAS CU). These two control units determine the combined operating strategies of the engine and after treatment device. Figure 1 Modern Control Architecture for OBD System in Commercial vehicle [1
Viewing 31 to 60 of 3404

Filter