Research on dynamic characteristics of the cylinder block
01 Jan 2006-International Journal of Vehicle Noise and Vibration (Inderscience Publishers)-Vol. 2, Iss: 1, pp 29-40
TL;DR: In this paper, a basic study on the experimental and analytical methods for the reduction of resonant vibration in each vibration mode on three cylinder ICE, in the rated engine speed range.
Abstract: The dynamic characteristics of the cylinder block directly influence the vibration and noise of the internal combustion engine (ICE). Modal analysis of the cylinder block is very helpful for its system identification and performance improvement. This paper refers to a basic study on the experimental and analytical methods for the reduction of resonant vibration in each vibration mode on three cylinder ICE, in the rated engine speed range. In order that the simulation embodies the block dynamic character accurately, a finite element (FE) model of a three cylinder ICE was built in I-DEAS environment and FE modal analysis was carried out numerically. Then experimental modal analysis was performed by the hammering method and the modal parameters (natural frequencies, mode shapes and mode damping factors) were obtained. The tested results were compared with those obtained from FE analysis. The result verifies the FE model. Based on the analysis, reasonable measures of reducing vibration and noise are brought forward.
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TL;DR: An overview of automotive NVH engineering can be found in this paper, where the authors classify the interior noise into powertrain-related NVH, road-and tyre-relatedNVH, and wind-related NEH.
Abstract: Vehicle noise, vibration and harshness (NVH) is an important vehicle attribute. It is usually among the top five attributes in terms of its priority in the design of any vehicle type. Like other attributes of safety, performance, dynamics and fuel economy, this attribute has to be considered closely in the design process. This manuscript presents an overview of automotive NVH engineering. It classifies the interior noise into powertrain-related NVH, road- and tyre-related NVH and wind-related NVH. This paper also discusses brake- and chassis-related NVH, squeak and rattle and electromechanical-related NVH. In addition, the paper addresses exterior NVH, frequently described as drive-by NVH. The phenomenon is divided into usual or expected NVH and unusual or unexpected NVH. The paper provides a review of some of the recent literature in the field of automotive NVH.
87 citations
01 Dec 2009
TL;DR: In this article, the state equations were solved by means of the Lumped-Parameter method and the Bond Graph procedure to describe the behaviors of vibration isolation, the dynamic models for three types of Passive Hydraulic Engine Mounts (PHEM) were developed.
Abstract: To describe the behaviors of vibration isolation, the dynamic models for three types of Passive Hydraulic Engine Mounts (PHEM) were developed in this paper respectively. The state equations were then introduced and solved by means of the Lumped-Parameter method and the Bond Graph procedure. Numerical results were presented for both low and high frequency responses. Then, comparative analyses were carried out. Comparisons showed that the PHEM (with inertia track, decoupler and throttle) behaved the best dynamic characteristics with means of frequency-dependent and amplitude-dependent. The bandwidth of frequencies was also extended to cover high frequencies, which could be the most favorite performance for the researchers and car-manufactures.
2 citations
14 Aug 2009
TL;DR: The methods for simulating the system in the lumped model and the numerical predictions model for modeling PHEM are effective, with which the dynamic characteristic analysis and design optimization of an PHEM can be performed before its prototype development, and this can ensure its low cost and high quality for development.
Abstract: Dynamic modeling of Passive Hydraulic Engine Mounts (PHEM) is developed with inertia track, decoupler and throttle. Mathematically, the state equations governing vibration isolation behaviors of the PHEMs are presented and solved by means of the lumped parameter method. Numerical results are produced for low and high frequency responses of the engine mounts. It is shown the engine mounts are possessed of better dynamic performance characteristics such as frequency-dependent and amplitude-dependent. The experiments are made for the purpose of parameters designs and validation of the PHEM. It has been shown by comparison of the numerical results with the experimental observations that the present PHEM achieves fairly good performance for the vehicle industry. The work conducted in the paper demonstrates that the methods for simulating the system in the lumped model and the numerical predictions model for modeling PHEM are effective, with which the dynamic characteristic analysis and design optimization of an PHEM can be performed before its prototype development, and this can ensure its low cost and high quality for development.
2 citations
TL;DR: Conditions for the existence of locally expansive C 1 solutions forIterative equations which can be expressed by the following form f n(x) = H(x, f(x), f 2 (x),…, f n−1(x)), are investigated.
Abstract: Iterative equations which can be expressed by the following form , where , are investigated. Conditions for the existence of locally expansive solutions for such equations are given.
2 citations
Patent•
06 Jan 2012
TL;DR: In this paper, the authors proposed a method for selecting a wall of a mechanical part in a digital model, where the part is suppressed and the ribs in finite elements are linked to the mesh of another digital model.
Abstract: The method involves selecting a wall of a mechanical part (108) in a digital model. Geometric parameters of the ribs of the part are inputted (112). A set of lines (114) is generated according to the parameters. The lines are projected (116) on the wall. The ribs projected from the lines are automatically generated (118) from the lines projected according to the parameters. The part is suppressed (122), and the ribs in finite elements are meshed (124). The mesh of the ribs is linked to the mesh of another digital model. A vibratory response of the digital models is simulated (126). An independent claim is also included for a method for manufacturing a mechanical part.