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Found 6289 publications

Potential errors of acoustical testing induced by stinger excitation

No authors available

Publication Name: 25th International Congress on Sound and Vibration 2018, ICSV 2018: Hiroshima Calling

Publication Date: 2018-01-01

Volume: 1

Issue:

Page Range: 304-311

Description:

Using a shaker-stinger-structure setup for excitation is a common method nowadays for acoustical testing, however, the geometrical and material properties of the stinger and its fastening method can induce unwanted artefacts to measured characteristics. These uncertainties were artificially reproduced and their effects on the driving point mobility (DP) and frequency response function (FRF) were examined. Stinger buckling phenomena was found to have significant effect both on DP and on FRF. More parameters were investigated experimentally and analytically, which have influence on the buckling phenomena, such as the stiffness of stinger end mounting, axial or radial pretension or slightly bent stinger shapes. The effect of these artificial errors were directly quantified. Furthermore, practical failures - as loosening of threaded mounting adapters - were reproduced and evaluated too. As a consequence, direct practical suggestions for stinger applications were formed, considering the excitation force and frequency range of interest.

Open Access: No

DOI: DOI not available

Vibration levels in vans as a function of payload and leaf spring sheet number

Péter Böröcz

Publication Name: Journal of Testing and Evaluation

Publication Date: 2018-01-01

Volume: 46

Issue: 1

Page Range: Unknown

Description:

Measuring the vehicle vibration environment is essential to understanding and simulating the adequacy of a packaged-product system and its ability to ensure protection from transportation hazards. In the transportation industry, various vehicles are used to perform shipping tasks, including light commercial vehicles that became the most popular vehicles in single unit and lightweight package transportation. In this study, the transport vibration levels in vans were measured as a function of payload and number of leaf spring sheets used. The vans consisted of one with a 20 % payload of total capacity and another with an 80 % payload. The vans were divided into two groups: Those with a single leaf spring and those with a double leaf spring. The measurement conditions were the motorway and speed between 110 and 130 km/h. The results revealed that transport vibration levels are affected by payload and the number of spring sheets. A low payload and single leaf spring contributed to the highest transport vibration levels. The power density level peaks were between 1.5 and 3.5 Hz, then around 15 Hz.

Open Access: Yes

DOI: 10.1520/JTE20160538

Introduction to the theoretical analysis of social exclusion of public transport in rural areas

No authors available

Publication Name: DETUROPE

Publication Date: 2018-01-01

Volume: 10

Issue: 3

Page Range: 214-227

Description:

Western societies are facing the same problems worldwide regarding the provision of public transport services in rural, sparsely populated and peripheral areas. One of the main reasons is that due to the increasing number of cars (which can satisfy the mobility needs much better), the number of passengers of public transport services are steadily decreasing (ITF, 2015). However, we do not forget that supplying these areas with public transportation have in fact always been problematic: the dispersed settlement network is a given fact as well as the low population density that never generated high demand (Ambrosino, Nelson & Romanazzo, 2003). Passengers of public transport in rural areas are not classified by the majority of international literature as voluntary travellers on public transport vehicles, but who belong to those groups which stand in need of travelling by them. Regarding this issue, the major starting-point is the ability to have access to car which can be modified by other factors (financial situation, sex, age, physical condition, type of household, foreign language skills etc.). Those people who have limited or no access to car are thus constrained by the schedule of public transport vehicles and depend on its reliability or even no access to any transport mode belongs to the group of transport deprived. The purpose of this article is twofold: to introduce those groups who are suffering from the decline of public transport in rural areas and to highlight the necessity of these researches in Central and Eastern Europe.

Open Access: No

DOI: DOI not available

The grass is always greener on the other side, or else Austria through the eyes of European rural developers

No authors available

Publication Name: DETUROPE

Publication Date: 2018-01-01

Volume: 10

Issue: 3

Page Range: 199-213

Description:

The study seeks to answer the question as to why the combined performance of agriculture and forestry can be explained by the fact that in an EU member state with an agricultural disadvantage and with an advanced economy, the size of the cultivated area is high. The reasons are complex and suggest a deliberately chosen strategy, the essence of which is that in Austria the social perception of agriculture is far more favorable than it would be expected from its GDP contribution. The reasons for this are partly rooted in the history of the past, but may also be linked to a more immediate and strategic decision making primarily on the transformation of the agricultural product structure, the efficient use of resources from the EU, the use of sophisticated tools for rural tourism and, last but not least, on the widespread shaping of the attitudes of the population.

Open Access: No

DOI: DOI not available

Maximal entropy and minimal variability OWA operator weights: A short survey of recent developments

Christer Carlsson Robert Fuller

Publication Name: Studies in Fuzziness and Soft Computing

Publication Date: 2018-01-01

Volume: 357

Issue: Unknown

Page Range: 187-199

Description:

The determination of ordered weighted averaging (OWA) operator weights is a very important issue of applying the OWA operator for decision making. One of the first approaches, suggested by O’Hagan, determines a special class of OWA operators having maximal entropy of the OWA weights for a given level of orness; algorithmically it is based on the solution of a constrained optimization problem. In 2001, using the method of Lagrange multipliers, Fullér and Majlender solved this constrained optimization problem analytically and determined the optimal weighting vector. In 2003 Fullér and Majlender computed the exact minimal variability weighting vector for any level of orness using the Karush-Kuhn-Tucker second-order sufficiency conditions for optimality. The problem of maximizing an OWA aggregation of a group of variables that are interrelated and constrained by a collection of linear inequalities was first considered by Yager in 1996, where he showed how this problem can be modeled as a mixed integer linear programming problem. In 2003 Carlsson, Fullér and Majlender derived an algorithm for solving the constrained OWA aggregation problem under a simple linear constraint: the sum of the variables is less than or equal to one. In this paper we give a short survey of numerous later works which extend and develop these models.

Open Access: Yes

DOI: 10.1007/978-3-319-60207-3_12

Development of a 400V/1000A inverter for testing electric drivetrains

No authors available

Publication Name: 31st International Electric Vehicle Symposium and Exhibition, EVS 2018 and International Electric Vehicle Technology Conference 2018, EVTeC 2018

Publication Date: 2018-01-01

Volume:

Issue:

Page Range: Unknown

Description:

The article describes the development process of an inverter that is suitable for driving, testing and supporting the development of synchronous and asynchronous electric motors. Design concepts and goals, hardware architecture, system components, built-in features and protections are presented regarding the power stage.

Open Access: No

DOI: DOI not available

Batch process scheduling with eS-graph: A case study

No authors available

Publication Name: 23rd International Congress of Chemical and Process Engineering, CHISA 2018 and 21st Conference on Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction, PRES 2018

Publication Date: 2018-01-01

Volume: 2

Issue:

Page Range: 952

Description:

Open Access: No

DOI: DOI not available

An S-graph based approach for multi-mode resource-constrained project scheduling with time-varying resource capacities

No authors available

Publication Name: 23rd International Congress of Chemical and Process Engineering, CHISA 2018 and 21st Conference on Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction, PRES 2018

Publication Date: 2018-01-01

Volume: 2

Issue:

Page Range: 955

Description:

Open Access: No

DOI: DOI not available

Use of multifunctional geocomposites as dampers for structure subjected to external vibrations

No authors available

Publication Name: 11th International Conference on Geosynthetics 2018, ICG 2018

Publication Date: 2018-01-01

Volume: 4

Issue:

Page Range: 2796-2802

Description:

Vibrations created by road or railway traffic are transmitted though soil to adjacent structures. In densely populated urban areas this can have an impact on the health and well-being of residents as well as affecting the value of their property. Geocomposite products with 3D looped filament polyamide cores have been used successfully over the world for decades in vertical and horizontal drainage applications. In situ monitoring coupled with complementary laboratory testing has led to a comprehensive understanding of the capabilities of these products, which due to the long-term elasticity of the polyamide core enables these materials to reduce the transmission of these vibrations. This paper discusses the efficiency of the geocomposite materials on the basis of newly executed field test results regarding the behaviour of geocomposite materials in dynamic pressure environment.

Open Access: No

DOI: DOI not available