Using Model Uncertainty to Reduce Verification and Validation in Noise and Vibration Problems

2012 ◽  
Author(s):  
Kevin Otto ◽  
Clas Jacobson
Keyword(s):  
Model Uncertainty ◽  
Verification And Validation ◽  
Noise And Vibration ◽  
Uncertainty Range ◽  
Design Changes ◽  
Vehicle Systems ◽  
Occupant Comfort ◽  
Design Requirements ◽  
Vibration Problems ◽  
Residual Errors

Verifying and validating that a mechanical system meets the design requirements is often a costly iterative activity. This is particularity true, for example, with complex vehicle systems that must meet noise and vibration requirements to ensure vehicle occupant comfort. We show here how analysis of model uncertainty can speed verification testing by bounding and guiding hardware prototype redesign. Vibration and acoustic model uncertainty and residual errors are estimated, and then analysis derived to ensure that this uncertainty range is covered by a planned set of design changes. We further use these results to define a complexity metric based on uncertainty, and an adaptability metric based on the domain of available adjustment. We then propose a capability metric by comparing the range of uncertainty against the range of adaptability provided. We demonstrate the efficacy with an example from the elevator system design, rapidly meeting noise and vibration requirements with only one prototype iteration.

Energy Analysis to the Design of Rotor-Bearing Systems

1995 ◽  
Author(s):  
W. J. Chen
Keyword(s):  
Energy Analysis ◽  
Computational Techniques ◽  
Design Strategies ◽  
System Parameters ◽  
Fundamental Properties ◽  
Design Engineers ◽  
Rotor Bearing ◽  
Design Requirements ◽  
Vibration Problems ◽  
Fundamental Physical

In the design of rotating machinery, it is often desirable and necessary to change a subset of system parameters to meet the design requirements. The success in designing rotor bearing systems and/or in solving the vibration problems depends heavily upon the understanding of fundamental physical properties and insights of the systems. The modeling improvements and computational techniques have been extensively presented over the years. The design methodologies and fundamental properties have not been widely addressed to assist design engineers in solving their practical problems. The objective of this paper is to relate the various forms of energy and work and their contributions to the system dynamic characteristics. The design strategies and methodologies using the energy approach are also presented and illustrated in a turbine driven machine.

Exploring Effective Change Propagation in a Product Family Design

2017 ◽  
Vol 139 (12) ◽  
Author(s):  
Inayat Ullah ◽  
Dunbing Tang ◽  
Qi Wang ◽  
Leilei Yin
Keyword(s):  
Product Family ◽  
Design Structure Matrix ◽  
Change Propagation ◽  
Effective Change ◽  
Design Structure ◽  
Design Changes ◽  
Requirements Change ◽  
Change Impact ◽  
Design Requirements

Product family (PF) design is a widely used strategy in the industry, as it allows meeting diverse design requirements. Change propagation in any PF is difficult to predict. Consequently, while numerous design change management methodologies presently exist, their application is restricted to a single artifact. This issue is overcome in the present study. The proposed framework explores effective change propagation paths (CPPs) by considering the risks associated with design changes in the PF with the aim of minimizing the overall redesign cost. The propagated risk, which would result in rework, is quantified in terms of change impact and propagation likelihood. Moreover, a design structure matrix (DSM) based mathematical model and an algorithm for its implementation are proposed to investigate the change propagation across the PF. Finally, to demonstrate their effectiveness, a PF of electric kettles is examined in a case study. The study findings confirm that the proposed technique is appropriate for evaluating different CPPs in PF.

Washers to Reduce Vibration and Noise From the Injection Molding Process

2006 ◽  
Author(s):  
Kuang-Yih Tsuei ◽  
Shu-Fen Kuo
Keyword(s):  
Injection Molding ◽  
Energy Absorption ◽  
Injection Molding Process ◽  
Performance Tests ◽  
Molding Process ◽  
Noise And Vibration ◽  
Vibration Problems ◽  
And Performance

The noise and vibration problems created by injection molding machines can be moderated by the installation of absorbers. The pull rods of the machine, which are guided to the molding movements, might be a better location for mounting a spring, rubber or hybrid elastomer for energy absorption and reduction of noise and vibration. In this paper, some special washers are designed to fit the guide rods and performance tests are carried out. The results show that noise and vibration decreased over 10 dB and 2 times, respectively.

CONTROL PERFORMANCE OF ER ENGINE MOUNT SUBJECTED TO TEMPERATURE VARIATIONS

2005 ◽  
Vol 19 (07n09) ◽  
pp. 1675-1681 ◽  
Author(s):  
H. J. SONG ◽  
S. B. CHOI ◽  
K. S. KIM
Keyword(s):  
Temperature Variation ◽  
Flow Mode ◽  
Control Performance ◽  
Damping Force ◽  
Engine Operation ◽  
Noise And Vibration ◽  
Vehicle Systems ◽  
Time Domains ◽  
Engine Mount ◽  
And Control

A key function of engine mount of vehicle systems is to support engine mass and isolate noise and vibration from engine disturbance forces. One of attractive candidates to achieve this goal is to utilize a semi-active ER engine mount. By applying this, we can effectively control damping force and hence the noise and vibration by just controlling the intensity of electric field. However, control performance of the engine mount may be very sensitive to temperature variation during engine operation. In this work, we investigate dynamic and control performances of ER engine mount with respect to the temperature variation. In order to undertake this, a flow-mode type of ER engine mount is designed and manufactured. Displacement transmissibility is experimentally evaluated for 1 degree of freedom. The ER engine mount is then incorporated with full-vehicle model in order to investigate vibration control performance. After formulating the governing equation of motion, a semi-active controller is designed. The controller is implemented through a hardware-in-the-loop simulation (HILS), and control responses such as acceleration level at various engine speeds are evaluated in the frequency and time domains.

scholarly journals Analysis of Common Problems of Noise and Vibration in Building Heating Ventilation Air Conditioning Design

2021 ◽  
Vol 283 ◽  
pp. 01051
Author(s):  
Xiaolong Ruan ◽  
Yisong Yin
Keyword(s):  
Continuous Improvement ◽  
Air Conditioning ◽  
Preventive Measures ◽  
Hvac System ◽  
Continuous Growth ◽  
Noise And Vibration ◽  
Vibration Problems ◽  
Common Problems ◽  
Air Conditioning Systems ◽  
And Control

With the continuous growth of my country's economy and the continuous improvement of the people's economic level, the demand for the design of heating, ventilation and air conditioning systems has also increased. The HVAC system is very important in the building environment. When optimizing the relevant design, it is necessary to always consider the design details of the HVAC system and adjust the integrity of the design, especially to take preventive measures in areas where noise and vibration may occur to avoid heating serious problems caused by noise and general vibration when the communication system is running. This article outlines how to avoid and control common noise and vibration problems when designing HVAC projects.

Advances in Modular Design: Optimizing Mechanical Connections for Hi-Mix, Low-Volume Product Designs

2015 ◽  
Author(s):  
Mark Lesher ◽  
Guy Prendergast ◽  
Rafael Moras
Keyword(s):  
Life Cycle ◽  
Life Cycle Cost ◽  
Modular Design ◽  
Rolling Stock ◽  
Heavy Duty ◽  
Design Changes ◽  
Volume Product ◽  
Design Requirements ◽  
Low Volume

In a previous study, we analyzed the life cycle cost impacts of component location changes as applied to rolling stock products [1]. Here, we present the results of an analysis that quantifies the costs of changing heavy-duty connection locations in modular fabrication designs. Modules that are fitted together usually include multiple lines of piping, cabling, and other connections, which can be problematic when the design may change due to out-of-tolerance dimensions or design requirements that change prior to installation. Also, design changes after site delivery may require frequent location changes for components that are mounted within modules. Inflexible connections internal to the module or chassis may hinder module-to-module connections in the field, where changes are difficult, hot work is dangerous, and quality of repair is dubious. The aim of this analysis was to evaluate the costs to change various types of pipe connections between modules and the costs to change component locations within modules. In addition to allowing mounting locations to be easily changed between and within modules, adjustable connection points enhance the modularization and customization of products at the lower levels of production associated with the energy, shipbuilding and rolling stock industries.

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