The operating hourly cost of the machine is a suitable factor to analyze the cost fluctuation certain machinery in a changing environment and to find of economically feasible work concepts for the studied machine system. This paper, which is based on studies carried out in northern forests of IR-Iran, analyzed and compared costs of four skidding and excavation machines used in timber harvesting...

In impedance control of hydraulic excavators the piston position and ram force of each hydraulic cylinder for the axis control of the boom, arm, and bucket can be determined. The problem is thus how to find the control voltage applied to the servovalves to track these commands to the hydraulic systems. This paper presents analytic, simulation and experimental results for controllers that have b...

Construction is a hazardous industry in which accidents occur frequently. Occupational accidents at construction sites are a serious public health issue in Korea. Construction site conditions often create dangerous situations by requiring workers and heavy equipment to work in close proximity to each other. In 2015, approximately 11% (46) of the 437 occupational fatalities in the construction i...

The processing of woody biomass waste piles for use as fuel instead of burning them was 11 investigated. At each landing slash pile location, a 132 kW grapple excavator was used to transfer 12 the waste piles into a 522 kW horizontal grinder. Economies of scale could be expected when 13 grinding a larger pile, although the efficiency of the loading operation might be diminished. Here, 14 three ...

The article considers the operation of excavators designed to mine hard or frozen soils. To reduce significant energy consumption, which characterizes process, active buckets equipped with special hammers are used. Minimizing consumption such can be achieved by optimally controlling their operating modes. Expressions for consumed a hammer, characteristics its head, modes, soil derived, minimum ...

BACKGROUND In order to expand the range of activities of an excavator, attachments, such as hydraulic breakers have been developed to be applied to buckets. However, it is very difficult to predict the dynamic behavior of hydraulic impact devices such as breakers because of high non-linearity. Thus, the purpose of this study is to optimize the impact performance of hydraulic breakers. The ultim...

Keberhasilan dan tepat waktu dalam pelaksaan sebuah proyek tergantung pada perencanaan yang cermat terhadap metode pelaksanaan, penggunaan alat penjadwalan. Pemilihan berat juga memegang peranan penting keberhasilan suatu proyek. Proyek Pembangunan Prasarana Sungai Batang Lurus Maransi menggunakan Crane ini digunakan sebagai pengangkatan material untuk pemancangan sheet pile, sementara Excavato...

The purpose of an excavator is to dig up materials and load them onto heavy-duty dump trucks. Typically, positioned at the rear truck when loading. In order automate this process, paper proposes a system that employs combined stereo camera two LiDAR sensors determine three-dimensional (3D) position truck’s cargo box analyze its loading space. Sparse depth information acquired from used detect p...