Originally spear-headed by large corporations of the automotive industry, dynamic simulation of complete vehicles is increasingly practiced in the development of off-road machinery. Handling and ride comfort are common simulation fields, as are performance and efficiency. The challenge in simulating the complete system's dynamic behaviour is that in off-road machinery there are non-linear subsystems of various technical domains (drive train, hydraulics, electronics, mechanics, etc.), which are all tightly coupled. In the case of a wheel loader, the drive train and the hydraulics are parallel systems; both are competing for engine torque, which is in limited supply. In dynamic simulation of complete wheel loaders, one interesting aspect, specific for the working task, is the momentary power distribution between drive train and hydraulics, which is balanced by the operator. This paper presents the initial results to a simulation model of a human operator. Rather than letting the operator model follow a predefined path with control inputs at given points, it follows a collection of general rules that together describe the machine's working cycle in a generic way. The advantage of this is that the working task description and the operator model itself are independent of the machine's technical parameters. Complete sub-system characteristics can thus be changed without compromising the relevance and validity of the simulation. Ultimately, this can be used to assess a machine's total performance, fuel efficiency and operability already in the concept phase of the product development process.
Dynamic simulation of construction machinery: towards an operator model
Dynamische Simulation virtueller Maschinen: Richtung Operatormodell
2005
10 Seiten, 9 Bilder, 18 Quellen
Aufsatz (Konferenz)
Englisch
Operator Noise Control in Construction Machinery
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Europäisches Patentamt | 2023
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