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Using a System Reliability Model to Optimize Maintenance Costs A Best Practices Guide

HM-1 Integrated Vehicle Health Management Committee
  • Aerospace Standard
  • JA6097_201905
  • Current
Published 2019-05-07 by SAE International in United States
SAE JA6097 (“Using a System Reliability Model to Optimize Maintenance”) shows how to determine which maintenance to perform on a system when that system requires corrective maintenance to achieve the lowest long-term operating cost. While this document may focus on applications to Jet Engines and Aircraft, this methodology could be applied to nearly any type of system. However, it would be most effective for systems that are tightly integrated, where a failure in any part of the system causes the entire system to go off-line, and the process of accessing a failed component can require additional maintenance on other unrelated components.
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Noise Problem Resolution and Sound Quality Improvement of Valve Timing Belt in 4 Cylinders PFI Gasoline Engine

Maruti Suzuki India, Ltd.-Sanjay Poonia, Amandeep Singh, Jaspreet Singh, Shailender Sharma, Narinder Kumar
Published 2019-04-02 by SAE International in United States
IC Engine Timing belt is a major noise prone area and it takes time during development to achieve acceptable NVH characteristics. In an existing engine under series production noise problem observed due to excitation of timing belt span by crank timing sprocket tooth. From vehicle perspective noise was heard in vehicle cabin at around idling RPM and a second peak observed around twice the initial RPM. This paper includes a methodology for use of computer based analytical simulation methods to predict timing belt dynamic behavior and NVH characteristics. Along with development of computer based multi body dynamic model for timing belt, validation of simulation model with actual testing was done and after correlation of testing and simulated results countermeasure were finalized based on iterations in multi body simulation model.Multi body dynamics model of timing drive indicated resonance in one belt span when belt transverse vibration amplitude was converted from time domain to frequency domain using FFT. In an existing engine layout change to modify belt span length was not feasible to avoid resonance, other alternatives…
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Study of a Turbocharged Engine for Motorbike Application

Porsche Engineering Services GmbH-Vincenzo Bevilacqua, Giovanni Corvaglia, Klaus Fuoss, Matthias Penzel
Published 2018-10-30 by SAE International in United States
Nowadays, the engine charging practice is widely adopted in the automotive field in relation to the “downsizing” technology: the reduction of the displacement and the adoption of a higher boost pressure, through a charging system, allow shifting the engine operating point in a zone of higher efficiency for a given engine torque. On the other hand, given a certain displacement, a supercharger can be adopted to increase the performance of the engine.The objective of this work is to provide a detailed analysis about the feasibility of the implementation of a charged engine to a motorbike, with main focus on the possibility to achieve a challenging performance target: in a first stage, several engine architectures (In-line, V-configuration, Boxer) together with different charging concepts (centrifugal or volumetric compressor, with mechanical or fluid-dynamic connection to the engine) have been analyzed from the point of view of packaging. In a second part, a V4 engine architecture has been selected for a patrol motorcycle application: the conceptual investigation of the base engine design has been carried out with the development…
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Energy Management Through Direct Drive Servo Technology

  • Magazine Article
  • TBMG-27268
Published 2017-08-01 by Tech Briefs Media Group in United States

Direct drive servo motor and drive technology has many advantages. It reduces an axis’ parts count, mechanical losses, and often its objectionable noise. What’s more, it also increases the machine’s efficiency, lowering operation cost for the user due to its inertia ratio as compared to the more common mechanically advantaged multi-body axis designs. Reducing the mechanical transmission components (gearboxes, timing belts, pulleys, cams, lead screws, etc.) between the motor and its load is only part of the savings.


New 1.0L I3 Turbocharged Gasoline Direct Injection Engine

Honda R&D Co., Ltd.-Mitsuhiro Shibata, Masashi kawamata, Hirotaka Komatsu, Kazuki Maeyama, Masaru Asari, Naoki Hotta, Kazutaka Nakada, Hisashi Daicho
Published 2017-03-28 by SAE International in United States
To comply with the environmental demands for CO2 reduction without compromising driving performance, a new 1.0 liter I3 turbocharged gasoline direct injection engine has been developed. This engine is the smallest product in the new Honda VTEC TURBO engine series (1), and it is intended to be used in small to medium-sized passenger car category vehicles, enhancing both fuel economy through downsizing, state-of-the-art friction reduction technologies such as electrically controlled variable displacement oil pump and timing belt in oil system, and also driving performance through turbocharging with an electrically controlled waste gate.This developed engine has many features in common with other VTEC TURBO engines such as the 1.5 liter I4 turbocharged engine (2) (3), which has been introduced already into the market. Some of these are the rapid combustion concept realized by high tumble intake port design and the optimized combustion chamber configuration combined with a side mounted multi-hole direct injection system.In addition to VTC (valve timing control system), the VTEC (Variable valve timing and lift electronic control system) has been used in the intake…
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Simplified Machine Design Approach for Optimal Servomotor Control

  • Magazine Article
  • TBMG-24893
Published 2016-06-01 by Tech Briefs Media Group in United States

An often asked question from industrial machine builders or integrators is how they can effectively design or implement the conversion of a machine with servo technology to meet performance expectations. This is a specialized task filled with layers of complexity that can prove difficult to execute, even when the scope of work is fully understood.




Lindsay Brooke, Stuart Birch, Kami Buchholz, Paul Weissler
  • Magazine Feature Article
  • 16MEIP03_03
Published 2016-03-01 by SAE International in United States

Highlighting the design, engineering, and technologies inside some of the most competitive new gasoline and light-duty diesel ICEs.

Engine history bonus question for 100 points: What technology has been shared by the P-47 Thunderbolt fighter plane, Oldsmobile's 1962 Jetfire V8, the Saab 99 Turbo, and the 2016 BMW M4 GTS?



Automotive Engineering: February 3, 2016

Lindsay Brooke, Stuart Birch, Kami Buchholz, Paul Weissler
  • Magazine Feature Article
  • 16AUTP02_02
Published 2016-02-01 by SAE International in United States

Highlighting the design, engineering, and technologies inside some of the most competitive new gasoline and light-duty diesel ICEs.

Engine history bonus question for 100 points: What technology has been shared by the P-47 Thunderbolt fighter plane, Oldsmobile's 1962 Jetfire V8, the Saab 99 Turbo, and the 2016 BMW M4 GTS?


Demands on Future Timing drives - Chain and Belt in Competition

AVL LIST GmbH-Wolfgang Johann Schoeffmann, Caroline Truffinet, Michael Howlett, Norbert Ausserhofer, Andreas Zurk
Published 2015-04-14 by SAE International in United States
When designing a new internal combustion engine, the choice of technology for the timing drive system is one of the key decisions that determines the overall characteristics of the engine with far reaching implications on the remaining architecture and overall packaging of the engine. For Passenger car engines there are two mainstream technologies: toothed belts and chains. Each of these offers several sub-variants, such as dry vs. wet belt, or toothed vs. roller chain.This paper examines the differences between these technologies in relation to the key engine attributes including package, cost, weight, durability, NVH and frictional losses. A quantitative evaluation is made where possible, based on data collected from recent engine development programs, backed up by literature study and data from the component supply industry.These differences are reviewed in the light of current and expected future engine development trends in order to give a basis for the engine designer to choose the appropriate technology for coming years.
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Development of Indigenous Methodology for Design and Dynamic Analysis of Engine Valve Train System with Timing Chain Drive for High Speed Applications

A R A I-Rakesh Mulik, Sushil S Ramdasi
Published 2015-01-14 by SAE International in United States
In the pursuit of design and development of efficient, reliable and durable system and components for modern engines, there is a need to understand complications involved in building mathematical models for simulation. Valve train and timing drive systems are having higher rankings for addressing these attributes. Hence, a new comprehensive multi body dynamics model is built and equations are solved by state-variable approach.Model developed is validated and in order to probe into details of Hydraulic Lash Adjuster (HLA) behavior and coupled analysis of timing chain drive systems for valve train system, simulation is carried out to freeze design options. Engine timing drives used in engines are one of the most critical systems. Timing chains are preferred widely in modern high speed engines as compared to timing belts and gear drives. In spite of advantages of chain drive systems, their complex dynamic behavior is not well researched. The major objective of the current work is to design & develop timing chain drive and valve train system for a high speed three cylinder diesel engine and investigate…
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