In this paper, a 20-ton prototype compound hybrid excavator is presented which includes assisting electric motor, swing electric motor, a super capacitor pack, an engine and negative flow hydraulic system. The energy-saving principle of hybrid excavator is introduced as well. The development rules of power train which include parameter design rules of key components and hierarchical structure o...

Automation of excavation work calls for a robotic system able to perform the planned digging work, and responsive to interaction forces experienced during excavation. The development of automated excavation control method requires a dynamic model to describe the evolution of the excavator motion with time. The joint torques of the boom mechanism are generated by hydraulic rams which also affect...

In order to develop a mechanical simulation experiment, a dynamic simulation of crawler excavator walking mechanism is designed. The performance of walking mechanism of excavator is tested by dynamic simulation. According to the data analysis, it is known that crawler walking mechanism is an important part of mine excavator and a walking device with better adaptability than wheeled walking mech...

The aim of this paper is to propose a reliable mechanical model which can explain the interaction between an excavator for the diaphragm wall method and the surrounding ground. The non-linear interaction between the control plate of the excavator and the ground was formulated by an exponential type function. The subgrade reaction corresponding to the action of the control plate was expressed by...

The automation and robotics for earth moving machines were introduced to reduce labor cost and increase machines performances , the increment of position accuracy of the excavator bucket obtained by laser and/or automatic control systems meets both objects. Experimental tests and simulations have shown excavating accuracy to be about two centimeters , the excavating accuracy depends on position...

ABSTRACT: This paper describes an approach force-feedback of excavator which is considered for tele-operation using a novel designed haptic device in virtual environment. This study has two main themes, the newly designed haptic device and force-feedback algorithm in virtual environment for excavator. The device can be controlled by human arm joint. Using the device, motion of boom, arm and buc...

Purpose Operators and drivers are easily exposed to danger by excavators is operating in dangerous places such as slopes, soft ground, building dismantling sites, distressed areas, and construction waste land-fills. For the safe use of conventional excavators as a tele-operated system without any renovation, feedback information of the boom, arm, and bucket cylinder should be estimated as a sch...

Massive amounts of gene expression data are generated using microarrays for functional studies of genes and gene expression data clustering is a useful tool for studying the functional relationship among genes in a biological process. We have developed a computer package EXCAVATOR for clustering gene expression pro®les based on our new framework for representing gene expression data as a minimu...

Massive amounts of gene expression data are generated using microarrays for functional studies of genes and gene expression data clustering is a useful tool for studying the functional relationship among genes in a biological process. We have developed a computer package EXCAVATOR for clustering gene expression profiles based on our new framework for representing gene expression data as a minim...