| 1. |
- Alm, Håkan, et al.
(författare)
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The use of car phones and changes in driver behaviour
- 2001
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Ingår i: International Journal of Vehicle Design. - 0143-3369 .- 1741-5314. ; 26:1, s. 4-11
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Tidskriftsartikel (refereegranskat)abstract
- The effects of mobile telephone use on traffic safety is discussed in the article. A number of empirical studies are reviewed and it is concluded that the use of a mobile telephone concurrently with car driving may have a negative impact upon traffic safety. The sub-tasks of entering a telephone number and having a demanding conversation are especially likely to increase the risk of an accident. To minimize the negative impact from telephoning on traffic safety a number of recommendations are suggested.
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| 2. |
- Birgersson, F., et al.
(författare)
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Measurements and simulations of sliding wear, leakage and acoustic isolation of engine rubber gaskets
- 2020
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Ingår i: International Journal of Vehicle Design. Heavy Vehicle Design. - : INDERSCIENCE ENTERPRISES LTD. - 1744-232X .- 1741-5152. ; 27:4, s. 549-564
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Tidskriftsartikel (refereegranskat)abstract
- Design and verification of gasket elements between engine mounted components requires computation and physical tests with respect to wear. Wear is a common problem in engines today and mainly comes from engine vibrations and thermal loading. The vibrations are due to inertial loads as well as reaction forces to gas pressure in the cylinders. Here, a new method to correctly simulate the measured wear rate of an oil pan rubber gasket is described. The engine motion is derived directly from measurements and the resulting simulation process has a high efficacy. Much work exists on investigations of gasket sealings between cylinder head and block, where the thermal loading becomes very important. The method described herein, focuses instead on other types of gaskets on the engine, where the main failure mode is due to sliding wear caused by the engine block and component vibrations.
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| 3. |
- Bruzelius, Fredrik, 1974, et al.
(författare)
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Low speed performance based standards for the Nordic countries
- 2021
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Ingår i: International Journal of Heavy Vehicle Systems. - : Inderscience Publishers. - 1741-5152 .- 1744-232X. ; 28:1, s. 110-124
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Tidskriftsartikel (refereegranskat)abstract
- Performance based standards (PBS) is an effective regulator policy which can address variation complexity in vehicle combinations. This paper investigates aspects of using computer simulation and mathematical models to assess the performance of vehicle combinations in low speed manoeuvring, and in particular roundabouts. A set of 22 vehicle combinations, including existing conventional heavy vehicles as well as prospective high capacity vehicles, is used to study the effects of turn angle and road surface conditions on the friction demand and swept path measures. Simulation results suggest that the friction demand measure is dependent on the available grip. This makes it hard to interpret and may not be suitable in the PBS framework. The swept path measure is relatively unaffected by friction levels, and can hence be calculated with simple and robust expressions not considering the road interaction. However, turn angle affects the swept path measure considerably, and should be addressed when designing the PBS scheme implementation into the legislations.
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| 4. |
- Filipi, Z., et al.
(författare)
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Combined optimisation of design and power management of the hydraulic hybrid propulsion system for the 6 × 6 medium truck
- 2004
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Ingår i: International Journal of Vehicle Design. Heavy Vehicle Design. - 1744-232X .- 1741-5152. ; 11:3-4, s. 372-402
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Tidskriftsartikel (refereegranskat)abstract
- Hybrid propulsion systems are one of the critical technologies on the roadmap to future ultra-efficient trucks. While there is a significant body of work related to hybrid passenger cars and light commercial trucks, there are many open issues related to hybridisation of heavier trucks intended for both on- and off-road use. This work addresses those questions through a systematic analysis of the proposed parallel hydraulic hybrid powertrain for the Family of Medium Tactical Vehicles (FMTV). A representative duty cycle for the FMTV is generated based on information about the typical vehicle mission. A methodology for sequential optimisation of hybrid propulsion and power management systems is applied to a hydraulic hybrid configuration with posttransmission motor location, This analysis is critical in evaluating the fuel economy and mobility potential of the hybrid propulsion system, as well as enhancing our understanding of the phenomena leading to predicted fuel economy values.
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| 5. |
- Islam, Manjurul, 1984, et al.
(författare)
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A Parallel Design Optimization Method for Articulated Heavy Vehicles with Active Safety Systems
- 2013
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Ingår i: International Journal of Heavy Vehicle Systems. - 1741-5152 .- 1744-232X. ; 20:4, s. 327-341
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Tidskriftsartikel (refereegranskat)abstract
- This paper presents a parallel design optimisation method for Articulated Heavy Vehicles (AHVs) with Active Safety Systems (ASSs). In previous studies, a Genetic Algorithm (GA) has been applied to the design synthesis of AHVs and the objective function evaluations are computationally expensive. From a design point of view, the most challenging task is to deal with the trade-off relationship between unstable motion modes at high speeds and manoeuvrability at low speeds. To tackle the problem, a parallel computation technique with a master-slave system is proposed for the design of AVHs with ASSs. Active Trailer Steering (ATS), Differential Braking (DB) and Anti-Roll (AR) sub-systems are combined in an integrated ASS. Considering the interaction between the mechanical trailer and ASS, the proposed design method simultaneously optimises the active design variables of the controllers and passive design variables of the trailers in a single design loop using the masterslave computing system. The proposed method provides an effective approach to the design synthesis of AHVs with ASSs using a parallel computation technique.
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| 6. |
- Kharrazi, Sogol, 1980, et al.
(författare)
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Robustness analysis of a steering-based control strategy for improved lateral performance of a truck-dolly-semitrailer
- 2015
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Ingår i: International Journal of Heavy Vehicle Systems. - 1741-5152 .- 1744-232X. ; 22:1, s. 1-20
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Tidskriftsartikel (refereegranskat)abstract
- A control strategy for lateral performance improvement of a truck-dolly-semitrailer combination by active steering of the towed units is presented. The effectiveness and robustness of the controller are verified by extensive analysis of the controller performance in various driving conditions at high speeds and presence of uncertainties in vehicle parameters, such as tyre cornering stiffness and moment of inertia. It is shown that the controller reduces the yaw rate rearward amplification, offtracking and side slip angle significantly. It is also demonstrated that brake interventions by other controlling systems such as electronic stability control do not deteriorate the controller performance.
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| 7. |
- Kokkolaras, Michael, et al.
(författare)
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Simulation-based optimal design of heavy trucks by model-based decomposition : An extensive analytical target cascading case study
- 2004
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Ingår i: International Journal of Vehicle Design. Heavy Vehicle Design. - 1744-232X .- 1741-5152. ; 11:3-4, s. 403-433
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Tidskriftsartikel (refereegranskat)abstract
- We present the findings of an extensive case study for the decomposed, simulation-based, optimal design of an advanced technology heavy truck by means of analytical target cascading. The use of a series hybridelectric propulsion system, in-hub motors, and variable height suspensions is considered with the intention of improving both commercial and military design attributes according to a dual-use philosophy. Emphasis is given to fuel economy, ride, and mobility characteristics. The latter are predicted by appropriately developed analytical and simulation models. This article builds on previous work and focuses on recent efforts to refine the applied methodologies and draw final conclusions.
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| 8. |
- Lingman, Peter, 1975, et al.
(författare)
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Open loop optimal downhill driving brake strategies using non-linear programming
- 2007
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Ingår i: International Journal of Heavy Vehicle Systems. - 1741-5152 .- 1744-232X. ; 14:1, s. 36-56
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Tidskriftsartikel (refereegranskat)abstract
- In this paper open loop optimal trajectories for downhill driving are described. Problem formulation including process modelling, model simplification, transformation into a finite optimisation problem, and implementation into the TOMLAB optimisation package are presented. Results show that there is a large potential in controlling the complete brake system of a heavy duty truck and thereby simultaneously improve both mean speed (transport efficiency) and component wear cost. The resulting optimal trajectories define the upper limit for what is theoretically achievable in a real, closed loop, controller implementation and can be used to both inspire and verify the development of such algorithms.
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| 9. |
- Mikaelsson, Pär, et al.
(författare)
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Including deformation in a model for engine block dynamics : measurement and prediction of vibration
- 2019
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Ingår i: International Journal of Vehicle Design. Heavy Vehicle Design. - : INDERSCIENCE ENTERPRISES LTD. - 1744-232X .- 1741-5152. ; 26:1, s. 55-68
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Tidskriftsartikel (refereegranskat)abstract
- Internal combustion engines (ICE) are sources of vibration in many applications. Engine mounted components need to be designed with respect to fatigue, to withstand these vibrations. In order to compute an estimate of the fatigue life of a component, the vibration load needs to be known. A methodology that is based on a seven degree of freedom model to represent the engine block is proposed. By fitting measured accelerometer data to this model, acceleration levels in arbitrary positions and directions, related to the engine block, may be computed. Results presented for an engine vibration measurement show good agreement between measured and computed vibration levels. A measure to find erroneous accelerometer definitions is also proposed and exemplified through measurement results. The method also enables pointing out local dynamic phenomena at measurement points.
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| 10. |
- Park, S., et al.
(författare)
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Thermal management system modeling and component sizing for heavy duty series hybrid electric vehicles
- 2011
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Ingår i: International Journal of Vehicle Design. Heavy Vehicle Design. - 1744-232X .- 1741-5152. ; 18:3, s. 272-287
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Tidskriftsartikel (refereegranskat)abstract
- A thermodynamics-based Vehicle Thermal Management System (VTMS) model for a heavy-duty, off-road vehicle with a series hybrid electric powertrain is developed for analysing thermal behaviour and investigating power consumption under different vehicle driving conditions. The developed model is first used to define an acceptable and reasonable VTMS configuration; design space exploration techniques are then applied to determine optimal component sizes subject to performance and geometry constraints.
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