Design Sensitivity Analysis and Optimization of an Engine Mount System Using an FRF-Based Substructuring Method

Lee, D.-H.; Hwang, Woo-Seok; Kim, C.-M.

doi:10.1006/jsvi.2001.4160

Cited by 43 publications

(27 citation statements)

References 13 publications

(14 reference statements)

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“…In TPA, the total receiver response is obtained as a superposition of the partial contributions of individual transfer paths. Each individual contribution can be calculated as the product of the FRF by the operational force applied to that path as follows [7]: where p (ω), p (ω)/F i (ω), f i (ω), and N represent sound pressure at the target point inside a vehicle, frequency response functions between the target point and the force applied at transfer path i, the operational force at transfer path i, and the number of transfer paths, respectively. Here, the operational forces can be directly obtained from measurement using the force transducer or indirectly estimated from the auxiliary response measurements.…”

Section: Operational Force Identificationmentioning

confidence: 99%

“…Herein, synthesis method is the technique used to estimate the dynamic characteristics of a whole system that is assembled by substructures when the frequency response functions (FRFs) of the substructures are obtained by measurement or a simulation approach such as the finite element method [1][2][3][4][5][6]. Because this method can easily predict the dynamic response of the whole system when the configurations or properties of some substructures are modified, this method is generally applied to product development in various fields [6,7]. In addition, TPA is the technique used to identify the quantitative contributions of individual selected transfer paths.…”

Section: Introductionmentioning

confidence: 99%

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Local stiffness control for reducing vehicle interior noise by using FRF-based synthesis method

Kim

Kang

2011

J Mech Sci Technol

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This paper explores the feasibility of estimating the interior noise of a vehicle compartment when the attachment stiffness (i.e., the local stiffness of the mounting point at which operational force is applied) is altered. In order to change the local stiffness of the vehicle body, it was assumed that the local stiffness could be changed by attaching some additional systems to the vehicle body. The frequency response function (FRF)-based synthesis method is used herein to estimate the change in the local stiffness of the modified vehicle body. In addition, the change in the noise transfer function (NTF) can also be estimated using this method. Since the operational force transmitted from the source excitation to the body attachment is required to predict the interior noise of the vehicle body in the operational condition, a transfer path analysis (TPA) technique was performed. Various vehicles and additional systems were utilized to estimate the dynamic properties of the modified vehicle body. Results indicated that the synthesis technique is an appropriate method to estimate the change in the local stiffness and NTF of the modified vehicle body. The results also show that the interior noise of the body can be estimated accurately by using the synthesis technique and TPA procedure when the vehicle body is locally modified.

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Section: Operational Force Identificationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Local stiffness control for reducing vehicle interior noise by using FRF-based synthesis method

Kim

Kang

2011

J Mech Sci Technol

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“…D.-H. Lee et al 4 defined the integration area of the interior noise graph as the objective function to obtain the optimal engine mount design. J. Bretl 5 proposed a vehicle vibration response-based simulation method for the investigation of alternative designs.…”

Section: Introductionmentioning

confidence: 99%

“…The damping, however, is not a good candidate for the design variable since it is only dependent on the material property. 4 Using the dynamic analysis results from computer-aided simulations, we obtained potential compression stiffnesses for the engine left-hand mount and right-hand mount. Trial mounts were made for further development testing.…”

Section: Introductionmentioning

confidence: 99%

Experimental evaluation of crucial noise and vibration metrics for engine mount

Lu¹,

Jen²

2007

Noise Control Eng. J.

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A multi-objective experimental evaluation method concerning the crucial noise and vibration metrics for engine mounts was developed to provide the trade-off guidelines. We illustrated the noise, vibration, and harshness (NVH) design requirements for rubber engine mounts. Three mount stiffnesses for front mounts were used for development testing according to the results of dynamic analysis. Powertrain rigid body modal validation showed that all three mounts met the powertrain bounce frequency target. The experimental modal results were in a good agreement with the dynamic analysis predictions. The dynamic force validation showed a first promising step toward good design for NVH. Because the single performance of dynamic force was not appropriate for the comprehensive mounts development, we defined a combined NVH performance of an engine mount as the sum of five weighted individual crucial metrics concerning the mount attenuation, idle NVH, interior noise, secondary ride and subjective assessment. The weighting factors were set according to the local driving environment. We proposed the term "normalized integration area" to efficiently identify the mount performance of isolation and interior noise. Based on the evaluation method developed, we identified the trade-off mount specification for the application case. © 2007 Institute of Noise Control Engineering.

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“…The challenge for designers and engineers is how to properly select vibration isolators in order to minimise the force transmission to the engine base [11][12][13] and the powertrain mounting system [14,15]. Further work focuses on optimisation of engine mounting systems and blocks can be found in References [16][17][18][19][20][21][22][23], while the literature of using meta-heuristic algorithms (MHs) or evolutionary algorithms (EAs) for engine mounting and engine part design can be seen further in Reference [24].Both methods has been studied and used in industry, but the new design technique still lacks development. Recent works of automotive technology have focused on designing the motor of an electric vehicle (EV) to increase its efficiency and reduce vibration [25].…”

mentioning

confidence: 99%

Vibration Suppression of a Single-Cylinder Engine by Means of Multi-objective Evolutionary Optimisation

Sleesongsom

Bureerat

2018

Sustainability

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This paper presents a new design strategy for the passive vibration suppression of a single-cylindrical engine (SCE) through multi-objective evolutionary optimisation. The vibration causes machine damages and human pain, which are unsustainable problemsthat need to be alleviated. Mathematical forced vibration analyses of a single-cylinder engine, including dynamic pressure force due to ignition combustion, are presented. A multi-objective design problem is set to find the shape and size variables of the crank and connecting rod of the engine. The objective functions consist of the minimisation of the crank and connecting rod mass, and the minimisation of vibration response while the SCE is subject to inertial force and pressure force. Moreover, design constraints include crank and rod safety. The design problem is tackled by using an adaptation of a hybrid of multi-objective population-based incremental learning and differential evolution (RPBIL-DE). The optimum results found that the proposed design strategy is a powerful tool for the vibration suppression of SCE.an unconstrained optimisation problem to minimise the transmission of engine vibration due to inertial forces to the supporting structure where the case study is a mounted four-cylinder V-engine rotating at idling speed by an active balancing method. The individual balancing masses and associated phase angles of counter rotating balancing masses were chosen as design variables. Chiou et al. [5] proposed an optimum design in which disk counterweights were added to reduce shaking force and moment of the drag-link drive of mechanical presses. Sleesongsom [6] proposed applying multi-objective optimisation to reduce the engine mount translation and rotation displacements of SCE where the normalised normal constraint method [7], in combination with sequential quadratic programming, is an optimiser. The use of finite element analysis and optimisation codes for connecting rod [8], crankshaft [9], and piston design [10] has been conducted. In addition, the finite element technique has been used to optimise the crankshaft parameters of a single-cylinder motorcycle engine to reduce vibration without considering the gas pressure force inside the combustion chamber [11].The second vibration suppression technique for the engine is vibration isolation. The challenge for designers and engineers is how to properly select vibration isolators in order to minimise the force transmission to the engine base [11][12][13] and the powertrain mounting system [14,15]. Further work focuses on optimisation of engine mounting systems and blocks can be found in References [16][17][18][19][20][21][22][23], while the literature of using meta-heuristic algorithms (MHs) or evolutionary algorithms (EAs) for engine mounting and engine part design can be seen further in Reference [24].Both methods has been studied and used in industry, but the new design technique still lacks development. Recent works of automotive technology have focused on designing the motor of an electric vehicle (EV) t...

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Design Sensitivity Analysis and Optimization of an Engine Mount System Using an FRF-Based Substructuring Method

Cited by 43 publications

References 13 publications

Local stiffness control for reducing vehicle interior noise by using FRF-based synthesis method

Local stiffness control for reducing vehicle interior noise by using FRF-based synthesis method

Experimental evaluation of crucial noise and vibration metrics for engine mount

Vibration Suppression of a Single-Cylinder Engine by Means of Multi-objective Evolutionary Optimisation

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