Abstract
This industrial Ph.D. project concerns whole-body vibrations in human operated
construction machinery. The emissions of these vibrations is closely related to the
subjective experience of comfort and in some cases these vibrations can occur in
a level which can cause the operator back disorders on long term basis.
Whole-body vibrations are potential damaging for the human operator in a
frequency range for which the dynamics of the machines are dominated by the
inputs of the operator.
The objective of this project is to reduce the amount of potential damaging wholebody
vibrations for two different kinds of machinery; an articulated backhoe loader
and an articulated dump truck.
In this work a standardized procedure containing a set of duty cycles for measuring
and declaring whole-body vibrations has been proposed for both of these machines.
The result of the measuring is important to identify the critical operations modes
regarding whole-body vibrations.
Together with a Danish educational institution Ulfborg-Kjærgaard an experiment
with training of skilled backhoe loader operators has been carried out to investigate
the potential in training. The average reduction of whole-body vibration exposure
was more than 20 percent and at the same time the fuel consumption was reduced
significant. Training of operators is hence beneficial for both employees and
employers of the construction industry.
The whole-body vibration exposure on operators of dump trucks are dominated
by off-road driving as the higher speeds increases the vibrations level. Hence
suspension systems are more important for dump trucks and have a crucial impact
on the comfort level. In this work a three dimensional dynamic simulation code
has been developed to carry out analysis of vibration level, develop and optimize
the settings of the suspension systems.
In general for machinery that is relative complex to operate such as the backhoe
loader education carries the highest potential for improving comfort and reduce
the vibrations. A dump truck on the other hand is very easy to drive and requires
proper suspension systems to improve the comfort.
construction machinery. The emissions of these vibrations is closely related to the
subjective experience of comfort and in some cases these vibrations can occur in
a level which can cause the operator back disorders on long term basis.
Whole-body vibrations are potential damaging for the human operator in a
frequency range for which the dynamics of the machines are dominated by the
inputs of the operator.
The objective of this project is to reduce the amount of potential damaging wholebody
vibrations for two different kinds of machinery; an articulated backhoe loader
and an articulated dump truck.
In this work a standardized procedure containing a set of duty cycles for measuring
and declaring whole-body vibrations has been proposed for both of these machines.
The result of the measuring is important to identify the critical operations modes
regarding whole-body vibrations.
Together with a Danish educational institution Ulfborg-Kjærgaard an experiment
with training of skilled backhoe loader operators has been carried out to investigate
the potential in training. The average reduction of whole-body vibration exposure
was more than 20 percent and at the same time the fuel consumption was reduced
significant. Training of operators is hence beneficial for both employees and
employers of the construction industry.
The whole-body vibration exposure on operators of dump trucks are dominated
by off-road driving as the higher speeds increases the vibrations level. Hence
suspension systems are more important for dump trucks and have a crucial impact
on the comfort level. In this work a three dimensional dynamic simulation code
has been developed to carry out analysis of vibration level, develop and optimize
the settings of the suspension systems.
In general for machinery that is relative complex to operate such as the backhoe
loader education carries the highest potential for improving comfort and reduce
the vibrations. A dump truck on the other hand is very easy to drive and requires
proper suspension systems to improve the comfort.
| Bidragets oversatte titel | Human Machine Interaction by Simulation of Dynamics of Construction Machinery |
|---|---|
| Originalsprog | Engelsk |
| Udgiver | |
| ISBN'er, trykt | 87-91464-43-9 |
| Status | Udgivet - 2013 |