Vehicle nvh development powertrain mount optimization. Xiangyang xu etal, optimization design of powertrain mounting system considering vibration analysis of multiexcitation. A new optimization method of powertrain mounting system is developed based on the analysis of transfer path. Pdf optimization design of powertrain mounting system.
This paper investigates the design of a powertrain mounting system of a front wheel drive vehicle with a transversely. Introduction to ev powertrain function and performance. Thus, establishing a feasible mechanical model of powertrain mounting system or tely accura acquiring its dynamic properties through experiments play an important role in system design and optimization 3. The design strategies and calculation methods for powertrain mounting system with multipowertrain. So design of a mounting system for the powertrain with a threecylinder engine is more challenging. A study on optimization method of a powertrain mounting. The existing torque roll axistra decoupling theories for a powertrain mounting system assume that the stiffness and viscous damping properties are constant. Direct design methods of the mounting system also have been tried, using optimization algorithms, regardless of the coupling of physical modes. At bentley motors, the development approach for powertrain mounts has ramped up in recent years, from. Us8826877b2 flexible mounting system for powertrain.
Decoupling analysis for a powertrain mounting system with. A vital factor in meeting demanding nvh targets is the right design of the powertrain mounting system. This paper proposes a robust design method based on interval analysis and particle swarm optimization pso for the optimization of pms. Cooling the wiring harness for the 201011 car will be taken on by william jay kistler as an honors. Pdf the stiffness of mounting system determines the vibration isolation ability of the transmitted path, which is the key factor that affects the. The brand new m10 motor features an integrated centrifugal cooling system and annular array of cooling fins to enhance. The vibrations of the powertrain have great effects on the vibration of evaluation point located at the car body. These help reduce vibrations transmitted through the chassis and. A mounting flange is integrally cast with a powertrain component and extends outwardly therefrom. The mounting system is the primary interface between the powertrain and the frame. Design optimization and development of vibration analysis.
Although various subsets of the compliant base can be expressed. Squaremax fuel system installation instructions pdf. Automobile powertraincoupling vibration analysis on vehicle system this paper researches on the active vibration isolation of mounting system, when modeling, engine mounting system. To support the design, fev provides various simulation development tools that, among others, include the use of the powertrain mount designer an interactive tool for concept design. Glsv received a us navy phaseii sbir to develop a modular, adjustable system to launch and recover uuvs unmanned underwater vehicles from the freedom and independenceclass lcs ships. In the design of a powertrain mounting system pms, the. This dissertation presents techniques for the design of engine mounting system to address the issue of vibration isolation.
The six vibration frequencies and its corresponding modes were obtained and compared with experimental results. The system can be washed, making it ideal for industrial applications and aerial imaging in demanding environments. Powertrain mounting overview great lakes sound and. Pdf the design strategies and calculation methods for powertrain. Design method for a powertrain mounting system to decrease the. The excitation of vehicle powertrain is one of the most important. Automotive powertrain mounting system design optimization. Theoretical calculation and experimental analysis of the.
We seek to overcome this deficiency by proposing a new six degreeoffreedom analytical model of the powertrain system. Automotive powertrain mounting system design must balance three primary tasks. To reduce mount cost and production time, the mounts in a powertrain mounting system pms with multipowertrain should have the same. The design strategies for powertrain mounting systems play an important role in the reduction of vehicular vibration and noise. Stiffness of the mounting system was another goal, as the previous design had lateral deflections larger than deemed acceptable. The rational natural frequency allocation of the powertrain mounting system and system energy decoupling are optimized in the design.
The vehicle powertrain mounting system, generally, consists of a and several mounts powertrain connected to the vehicle structure 1. A powertrain mounting system includes a pair of engine and transmission mount assemblies. In order to offer the customer the best possible product, it is essential to include nvh optimisation in the development process from the start of the concept phase up to the production phase. Method for structural optimization of powertrain mounts. Last but not least, the clutch is an overload protection device intended to protect the valuable powertrain as a whole. Step by step to the right powertrain mounting system fev. Assuming small motions, the powertrain is modeled as a rigid body of timeinvariant inertia matrix m p of dimension 6. Evs to date utilize the same 12 volt power system as traditional vehicles for low to moderate power electrical components.
In particular, the systemrelated wear of the clutch facing leads to changes in the force and travel conditions, which must be considered in the clutch design. Techniques for engine mount modeling and optimization. Coilnearplug ignition system with 58x crankshaft position encoder, 4x cam. A mounting system for powertrain components requiring axial.
Along with system design requirements, various components and packaging options were considered. The powertrain mounting system dynamic stiffness properties are selected based upon the kind of road surface being modelled. In the design of a powertrain mounting system pms, the layouts for a powertrain and the mounts should meet some generally used layouts. Powertrain integration is a key task, which influences the noise and vibration. Engine mount is purposed to control an excessive motion generated from powertrain system and to isolate vibration and noise to be transmitted to main system. However, reallife mounts exhibit considerable spectrally varying stiffness and damping characteristics, and the influence of the spectrallyvarying properties of the hydraulic mounts on the powertrain system cannot be ignored. A method for calculating the displacements of a powrtrain and mounts in a powertrain mounting system including torque struts under quasistatic loads. The engine mount assemblies include an isolator assembly having an elastomeric bushing with an encapsulated mounting member, an integral snubber, and a bracket assembly having a one piece can arranged to house the bushing and having an interlock arranged to engage the bushing. The traditional analysis and optimization methods for powertrain mounting system design are often based on deterministic or random models. Preliminary design and estimation coupled with fundamental engineering rational focused the design to a particular setup.
If the mounts in the powertrain mounting system are rubber mounts, the vibrations of the powertrain will be large since the damping of the rubber mount is lower. As stiffness and damping elements connecting the transmission system and vehicle body, the rubber mount exhibits better vibration isolation performance than the rigid connection. Compared with unbalance forces and moments of four and sixcylinder engines, forces and moments applied to the engine block from a threecylinder engine are large and the mechanism for balancing the unbalance forces are complex. The mount vibration isolator is developed based on the optimization results, and the experimental verification of interior noise which is closely. The design strategies and calculation methods for powertrain mounting system with multipowertrain article pdf available in international journal of vehicle design 6012. Optimization of vehicle powertrain mounting system and its. Evs dont have alternators like most vehicles with engines, so the 12 volt system power is supplied by the battery pack with a 12v battery to supply transients. Pdf download for design method for a powertrain mounting system. Vehicle powertrains typically include a motive source, such as an engine, and include a transmission that provides power from the motive source to the wheels. The balance theories of two different balance methods are presented. These uncertainties will definitely deteriorate the performance of pms. The inline 3cylinder engine is taken as an object, the imbalance resultant rotating inertia moment and resultant reciprocating inertia moment generated by pistoncrank mechanisms are analyzed. Method for structural optimization of powertrain mounts shape optimization of torque rods to meet static stiffness requirement.
The present teachings generally include a method of designing a vehicle powertrain mounting system, and a powertrain mounting system designed according to the method. For the generic powertrain mount system of figure 3b, the inertial coordinate system for the rigid body is denoted as c g, the tra coordinate system is given by ctra, and the 88 t. An elastic component for reduction of powertrain vibration transmission and for connection and support, playing a critical part in limiting powertrain. In this study, an efficient analysis and optimization method is developed for powertrain mounting system design involving interval uncertainty. Abstract the design logic and calculation method for determining mount stiffness and damping for a powertrain mounting system pms based on reductions of vehicle vibration and noise contributed by mounts is proposed in this paper. Developing powertrain mounting systems in the virtual. Robust optimization of powertrain mounting system based on. The recovery system will utilize a common read more. Analysis of powertrain motions given a combination of. We seek to overcome this deficiency by proposing a new six degreeof. The final design included a single three phase electric motor capable of up to 100kw peak with a limited slip differential, and a mass reduction of almost. Design of powertrain mounting system for engine with three cylinders 2015012354. Vibration analysis of powertrain mounting system with a.
An opening extends through the mounting flange defining a mounting flange axis and axially receives a portion of a powertrain component for support therein, and by the mounting flange. For example, a moderate surface will be modelled using a powertrain mounting system with a 0. Design of powertrain mounting system for engine with three. Pdf the design strategies and calculation methods for. This paper introduced the method that developed model and frequency analyses of powertrain mounting system based on adams automatic dynamic analysis of mechanical systems. Pdf a method for calculating the displacements of a.
Mount stiffness of the four mounting parts were optimized to use adamsinsight. Besides supporting the powertrain weight, the major function of powertrain mounts is to isolate the unbalanced engine disturbance force from the vehicle structure. Automobile powertraincoupling vibration analysis on. This paper presents a complete design process of the mounting system. Owing to the uncertainties of the manufacturing or installation errors, the real value of the powertrain mounting systems pms is always varying around its nominal value. Optimization design and performance analysis of vehicle. Stochastic structural optimization of powertrain mounting. Stochastic structural optimization of powertrain mounting systems. Squaremax powertrain mounting installation 7387 gm c series 8891 gm r series squaremax engine mount installation instructions pdf download.
Developing powertrain mounting systems in the virtual engineering. The results show that the optimized repositioning mounts. Glsv powertrain mounting design process mount system analysis rigid body mode coupling and placement, static displacements and rotations mount design analysis model and fea design to target nominal and nonlinear stiffness and obtain actual rates. The second step is the conceptual design of the mount system. The powertrain is supported by 3 or 4 mounts on a compliant base that is defined as a discrete system of dimension n b. Design method of automotive powertrain mounting system. Given the spectral variance in the mount properties, a simple roll mode decoupling scheme is suggested for the powertrain isolation system. Automotive vehicle powertrain mounting system optimum. Therefore, investigating the powertrain rigid body modes for a particular mounting system is very critical in determining initial mount locations and spring rates for a new powertrain or vehicle architecture. In order to solve the vibration problem of diesel engine powertrain assembly at its idle state, a six degreeoffreedom dynamics model of the powertrain mounting system is established and a optimization based on adamsview is applied to simulation and analysis on the powertrain mounting system with energy decoupling method. A specific vehicle mounting system has been design ed using the optimization programs developed in matlab. The e5000 pro tuned propulsion system is designed for multirotor aircraft with a payload of 4. Optimization design of powertrain mounting system considering.
In the design of a powertrain mounting system pms, the layouts for a powertrain and the. Our groups work on the powertrain for the 201011 fsae car was divided into 3 major project aspects, with some additional breakdowns under them. Most of the prior work on active mounting systems has been conducted in the context of a single degreeoffreedom even though the vehicle powertrain is a six degreeoffreedom isolation system. Glsv awarded us navy sbir to develop a modular launch and recovery system for uuvs.
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