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Design optimization for Engine mount

Prateek Sharma
VE Commercial Vehicles, Ltd.-Mahendra Parwal
  • Technical Paper
  • 2019-28-2540
Published 2019-11-21 by SAE International in United States
The mounting of an engine plays important role in controlling the vibration transmissibility, alignment of transmission unit within specific limit. Design of any mounting system mainly depends on stiffness, allowed deformation and transmissibility of force, natural frequency and size w.r.t space constraints etc. This paper helps to study the behavior of engine mount with different layer of rubber with defer stiffness. Firstly the design of front engine mount with single rubber layer according to space constraint in vehicle and then analysis is done to determine the deformation and various results using CAE technique. As per the results, design is modified with varying layer of rubber pad and again analysis is done with same boundary condition followed by improved results.
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Methodology for failure simulation Using 4 corner 6 DOF Road load simulator of Overhanging Components: An Experimental Approach

Maruti Suzuki India, Ltd.-Naveen Malik, Ayan Bhattacharya, Sahil Jindal, Sayed Zergham Ali Naqvi
  • Technical Paper
  • 2019-28-2404
Published 2019-11-21 by SAE International in United States
Nowadays, Road Load Simulators are used by automobile companies to reproduce the accurate and multi axial stresses in test parts to simulate the real loading conditions. The road conditions are simulated in lab by measuring the customer usage data by sensors like Wheel Force transducers, accelerometers, displacement sensors and strain gauges on the vehicle body and suspension parts. The acquired data is simulated in lab condition by generating ‘drive file’ using the response of the above mentioned sensors. For generation of proper drive file, not only good FRF but ensuring stability of inverse FRF is also essential. Stability of the inverse FRF depends upon the simulation channels used. In this paper, an experimental approach was applied for focused failure simulation of engine mount, one of such low correlation zone, with known history of failure. Methodology was established to simulate proving ground loads on engine mount along with simulation of loads at wheel center using a 4 corner 6 DOF road load simulator. Result was verified by endurance run on test rig and matching the nature…
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Method for Predicting Lateral Attenuation of Airplane Noise

A-21 Aircraft Noise Measurement Aviation Emission Modeling
  • Aerospace Standard
  • AIR5662
  • Current
Published 2019-10-04 by SAE International in United States
This document describes analytical methods for calculating the attenuation of the level of the sound propagating from an airplane to locations on the ground and to the side of the flight path of an airplane during ground roll, climbout after liftoff, and landing operations. Both level and non-level ground scenarios may be modeled using these methods, however application is only directly applicable to terrain without significant undulations, which may cause multiple reflections and/or multiple shielding effects. This attenuation is termed lateral attenuation and is in excess of the attenuation from wave divergence and atmospheric absorption. The methods for calculating the lateral attenuation of the sound apply to: turbofan-powered transport-category airplanes with engines mounted at the rear of the fuselage (on the sides of the fuselage or in the center of the fuselage as well as on the sides) or under the wings propeller-driven transport-category or general-aviation airplanes propagation over ground surfaces that may be considered to be “acoustically soft” such as lawn or field grass situations where the terrain to the sides of the flight…
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Low-Speed Impact Bumper System Test Procedure for Passenger Vehicles

Motor Vehicle Council
  • Ground Vehicle Standard
  • J2319_201910
  • Current
Published 2019-10-03 by SAE International in United States
The scope of this SAE Recommended Practice is restricted to the testing of original equipment on passenger vehicles and to provide for a uniform industry test procedure.
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Test Method for Measuring Performance of Engine Cooling Fans

Cooling Systems Standards Committee
  • Ground Vehicle Standard
  • J1339_201909
  • Current
Published 2019-09-30 by SAE International in United States
This SAE Recommended Practice is intended for use in testing and evaluating the approximate performance of engine-driven cooling fans. This performance would include flow, pressure, and power. This flow and pressure information is used to estimate the engine cooling performance. This power consumption is used to estimate net engine power per SAE J1349. The procedure also provides a general description of equipment necessary to measure the approximate fan performance. The test conditions in the procedure generally will not match those of the installation for which cooling and fuel consumption information is desired. The performance of a given fan depends on the geometric details of the installation, including the shroud and its clearance. These details should be duplicated in the test setup if accurate performance measurement is expected. The performance at a given air density and speed also depends on the volumetric flow rate, or the pressure rise across the fan, since these two parameters are mutually dependent. These parameters depend on the pressure drop across the radiator core and the ram pressure due to vehicle…
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FEM Substructuring for the Vibrational Characterization of a Petrol Engine

FCA Italy S.p.A.-Antonio Parente, Mauro Pirelli
University of Naples-Enrico Armentani
  • Technical Paper
  • 2019-24-0059
Published 2019-09-09 by SAE International in United States
In this work the vibrational behavior of a 4-cylinder, 4-stroke, petrol engine has been simulated by leveraging on a reduced modelling strategy, based on the Component Mode Synthesis (CMS), adopted to reduce the size of the full FEM model of the engine.The FEM model of the engine, comprising all of its sub-components, has been preliminary characterized from the vibrational standpoint; subsequently, the CMS has been adopted in order to reduce the FEM model size.Frequency Response Function (FRF) analyses have been used to identify the resonant frequencies and mode shapes of the different FEM models, and the so-obtained results have been compared showing a very good agreement.The reduced model has been able to reproduce with a high accuracy the vibration response at the engine mounts. The adopted reduced modelling strategy turned out to be effective in lowering the computational burden, keeping, at the same time, an accurate replication of the engine vibrational behavior. Runtimes have been significantly reduced from 24 hours for the full FEM model to less than 2 hours for the reduced model.
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Optimization Approach to Passive Engine Mounting System for Reducing Automotive Vibrations

K. N. Toosi University of Technology-Reza Abedi, Amir H. Shamekhia
Shahid Beheshti University-Abbas Rahi
Published 2019-07-08 by SAE International in United States
Improvised noise, vibration, and harshness (NVH) performance of vehicle implies better comfort for passengers. Apart from road inputs, engine vibration is one of the major contributors to interior vibrations in automotive. The aim of this paper is to optimize specifications and locations of engine mounts to reduce vehicle vibration without affecting engine performance and to provide better ride comfort. This paper also includes the challenges involved in the analysis of engine vibration on critical conditions such as movement on the road surface or braking action. Therefore, a fully numerical simulation expands to a four-cylinder engine by considering piston side force. In this model, the mass distribution in the connecting rod and crankshaft, outside of the center pin, and friction between the cylinder and piston have been considered. Furthermore, simulation analysis is implemented for an engine in vehicle movement with constant speed on the road class B roughness and braking conditions. Engine location, the angle of placement, and dynamic characteristics of mounts are the important parameters to reduce vibrations transferred to the vehicle frame. The optimization…
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New Method for Decoupling the Powertrain Roll Mode to Improve Idle Vibration

FCA US LLC-Syed F. Haider, Ahmad Abbas, Francisco Sturla
Published 2019-06-05 by SAE International in United States
Modern engines have high torque outputs and have low RPM due to increased demand for fuel efficiency. Vibrations caused by such engines have to be mitigated. Decoupling the roll mode from the remaining five rigid body modes results in a response which is predominantly about the torque roll axis (TRA) and helps reduce vibrations. Therefore, placing the mounts on the TRA early in the design phase is crucial. Best NVH performance can be obtained by optimizing the powertrain mount parameters viz; Position, Orientation and Stiffness. Many times, packaging restricts the mounts to be placed about the TRA resulting in degradation in NVH performance. Assuming that the line through the engine mount (Body side) centers is the desired TRA, we propose a novel method of shifting the TRA by adding mass modifying the powertrain inertia such that the new TRA is parallel to and on top to the desired TRA. This in turn will decouple the roll mode and reduce vibrations. This problem is formulated as an optimization problem. The numerical examples presented in this paper…
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Development of New I4 2.5L Gasoline Direct Injection Engine

Nissan Automotive Technology Co., Ltd.-Naohiro Yoshida
Published 2019-04-02 by SAE International in United States
A new 2.5L 4-cylinder direct-injection engine (PR25DD) was developed for use on the new 2019 model year Altima as a successor to the QR25DE engine mounted on the previous model. The development concept defined for this new 4-cylinder engine was to achieve acceleration, fuel economy and noise, vibration and harshness (NVH) performance at the highest possible levels by incorporating the latest technologies, including a world’s first application.The PR25DD engine continues Nissan’s new engine concept of recent years with regard to the basic engine systems, including the use of direct injection, an electrically operated valve timing control (VTC) system, cooled exhaust gas recirculation (EGR), an integrated exhaust manifold, mirror bore coating and a variable displacement oil pump [1]. In addition to these features, it also adopts a resin intake port. The resin port is inserted into the intake port cast in the cylinder head, thereby forming an air layer between the intake air passageway and the head inner wall so as to suppress the rise in intake air temperature. This world’s first application of a resin…
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Design and Modelling of Single Cylinder 4 Stroke Gasoline Engine Crankshaft

CASRAE, Delhi Technological University-Shourya Paul, Devanshu Jain, Rohan Brella, Naveen Kumar
Published 2019-04-02 by SAE International in United States
The crankshaft translates the reciprocatory motion of the piston into rotary motion. A flywheel is generally connected to the crankshaft to reduce the vibrating characteristic of four stroke cycle. Counterweights are added for each reciprocating piston to provide engine balance while operating. Gasoline engines have curtailed compression ratio therefore shorter stoke length as a deduction have higher RPM in comparison to diesel counterpart. A crankshaft is subjected to enormous stresses, potentially equivalent of several tones of force. Failure of the crankshaft is predominantly due to violent vibrations, insufficient lubrication, excessively pressurized cylinder. This research aims to examine the stress subjected to acute points on a crankshaft. Three dimension model of 4 stroke single cylinder engine crankshaft is modeled using SolidWorks v18. End conditions were applied taking into consideration the engine mountings of the crankshaft. Stresses were applied to crankpin to replicate the forces of a running engine. Twisting moment causes Shear stresses; bending moment are determinant of the tensile and compressive stresses. This research was conducted for two different materials Stainless steel and Epoxy carbon…
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