Analysis of scattering operation for wheel loader considering digging behavior of soil

2019 ◽  
Vol 2019 (0) ◽  
pp. 503
Author(s):  
Ryusei AMANAI ◽  
Toshinobu TAKEI ◽  
Etsujiro IMANISHI
Keyword(s):  
Wheel Loader ◽  
Digging Behavior

scholarly journals Digging behavior discrimination test to probe burrowing and exploratory digging in male and female mice

2021 ◽  
Author(s):  
Heather L. Pond ◽  
Abigail T. Heller ◽  
Brian M. Gural ◽  
Olivia P. McKissick ◽  
Molly K. Wilkinson ◽  
...  
Keyword(s):  
Discrimination Test ◽  
Male And Female ◽  
Female Mice ◽  
Digging Behavior

Structure Improvement on Dual Variable Gear Shaft of the Transmission for ZL50 Wheel Loader

2012 ◽  
Vol 496 ◽  
pp. 50-53
Author(s):  
Zhan Shun Yin ◽  
Yong Wei Han ◽  
Xi Chun Cai
Keyword(s):  
Heat Treatment ◽  
Service Life ◽  
Dual Variable ◽  
Practical Application ◽  
Hydraulic Pump ◽  
Wheel Loader ◽  
Geometric Tolerance ◽  
Structure Improvement ◽  
Cae Analysis ◽  
Market Feedback

Based on the CAE analysis. The dual variable gear shaft of the transmission for domestic ZL50 wheel loader was redesigned and the processing technology was optimized. The problem of the hardness of the spline which connects the dual variable gear shaft and the working hydraulic pump can not meet the requirements after heat treatment caused by unreasonable design was solved. The problem of the low geometric tolerance and early wear of the spline were solved. After practical application, the market feedback shows that the failure rate, service life and reliability greatly of new designed shaft were enhanced

The Research of the Wheel Loader Working Device

2012 ◽  
Vol 155-156 ◽  
pp. 746-750
Author(s):  
Wei Wei Zhang ◽  
Jun Zhou ◽  
Jian Xin Deng
Keyword(s):  
System Model ◽  
Variable Geometry ◽  
Wheel Loader ◽  
Construction Machinery ◽  
Successful Model ◽  
Safety And Reliability ◽  
Great Pressure ◽  
Working Principle ◽  
Increasing Demand ◽  
Working Device

On the background of increasing demand of construction machinery, the requirement of energy saving without affecting performance, safety and reliability put great pressure on engineering staffs. A comprehensive grasp of the whole system in constitution and working principle exactly helps designers in control and modifications theoretically. Evaluations and discusses in this article are based on a model in Simulation X, and variable geometry parameters in the system model make the matching of desired result easily. A successful model build for working devices of the wheel loader, and all technical result can be acquired easily in the soft ware, the result curves can easily revealed the requirement of optimizing the design of the whole machine.

Multirate Integration for Real-Time Simulation of Wheel Loader Hydraulics

1999 ◽  
Author(s):  
Laurenţiu I. Buzdugan ◽  
Ole Balling ◽  
Peter Chien-Te Lee ◽  
Claus Balling ◽  
Jeffrey S. Freeman ◽  
...  
Keyword(s):  
Real Time ◽  
System Modeling ◽  
Pressure Fluctuations ◽  
Integration Scheme ◽  
Step Size ◽  
Integration Algorithm ◽  
Wheel Loader ◽  
Real Time Simulation ◽  
Time Simulation ◽  
Dynamics Models

Abstract This paper details a real-time simulation of an articulating wheel loader, which is comprised of a multibody system modeling the chassis and the bucket assembly and a set of subsystems. The hydraulic subsystem is modeled by a set of ODE’s which represent the oil pressure fluctuations in the system. An Adams-Bashforth-Moulton integration algorithm has been implemented using the Nordsieck form to develop a constant step-size multirate integration scheme, modeling the interaction between the hydraulic subsystem and multibody dynamics models. An example illustrating the simulation of a wheel loader bucket operation is presented at the end of the paper.

Preparation of a Virtual Proving Ground for Construction Equipment Simulation

1998 ◽  
Author(s):  
Peter Grant ◽  
Jeffrey S. Freeman ◽  
Rob Vail ◽  
Frank Huck
Keyword(s):  
Phase I ◽  
Driving Simulator ◽  
Construction Equipment ◽  
Machine Model ◽  
Data Set ◽  
Wheel Loader ◽  
Time Dynamics ◽  
Motion System ◽  
Acceleration Time Histories ◽  
Simulator Motion

Abstract A multi-phased evaluation of the Iowa Driving Simulator as a virtual proving ground for construction equipment simulation is presented. In Phase I the Iowa Driving Simulator was evaluated in an “open-loop” mode to assess its capability to simulate a typical maneuver common to wheel loader operation, and its viability as a test platform for human subject evaluation of those maneuvers. A typical wheel loader truck loading cycle involves numerous directional shifts. Cycle productivity is increased if these shifts are executed at full engine throttle. Jerk and acceleration levels associated with full throttle shifts, however, can cause both operator discomfort and spillage of loaded material. Electronically controlled transmissions have the potential to both minimize directional shift times and material loss while optimizing operator comfort. This optimization will require an understanding of the factors which affect operator comfort during shifts. A study was therefore devised to determine those aspects of the motion generated by a directional shift which affect operator comfort. The Iowa Driving Simulator motion system was used to present operators with a series of acceleration time histories which are representative of various shift strategies. The operators rated the relative comfort of each strategy during paired comparison tests. Limitations of the simulator motion system prevented definitive results from being drawn; however, results did confirm shift comfort criteria previously established by the machine manufacturer. Success of the Phase I effort was sufficient to warrant a more in-depth study. In Phase II a complete VPG environment for wheel loader operation on the IDS was developed and qualitatively evaluated. This VPG environment included a visual model of a mine pit, developed for Caterpillar, Inc. by engineers at its National Center for Supercomputing Applications office, combined with the immersive motion capability of the Iowa Driving Simulator. A real-time dynamics model of a generic wheel loader along with a menu driven interface to the data set used to simulate a particular wheel loader were developed at Center for Computer Aided Design. This combination of programs allows changes to the design of a loader to be rapidly evaluated within a virtual proving ground environment or off-line at an engineering workstation. The machine model was then combined with an implement/soil interaction model, also developed at Caterpillar’s National Center for Supercomputing Applications office. The resulting machine model can be evaluated either off-line at a workstation or driven in response to operator input within the Iowa Driving Simulator virtual proving ground environment. A comparison of the offline model’s predictions of machine response to swept-sinewave steering input is shown to compare favorably with measured performance of the actual machine.

scholarly journals Study of the wheel loader vibration with a developed multibody dynamic model

2017 ◽  
Vol 133 ◽  
pp. 02007
Author(s):  
Nikolay Pavlov ◽  
Evgeni Sokolov ◽  
Mihail Dodov ◽  
Stoyan Stoyanov
Keyword(s):  
Dynamic Model ◽  
Wheel Loader ◽  
Multibody Dynamic

The Case 621 Wheel Loader

1990 ◽  
Author(s):  
Harold W. Hill
Keyword(s):  
Wheel Loader

scholarly journals Heat exchange performance optimization of a wheel loader cooling system based on computational fluid dynamic simulation

2018 ◽  
Vol 10 (11) ◽  
pp. 168781401880398 ◽  
Author(s):  
Chao Yu ◽  
Sicheng Qin ◽  
Yang Liu ◽  
Bosen Chai
Keyword(s):  
Heat Exchange ◽  
Flow Field ◽  
Thermal Management ◽  
Cooling System ◽  
Management Model ◽  
Maximum Deviation ◽  
Engine Compartment ◽  
Wheel Loader ◽  
Exchange Performance ◽  
Transmission Oil

This study establishes a thermal management model to improve the heat exchange performance and uniformity of the flow-field distribution in the engine compartment of a wheel loader. Flow-field analyses are performed for an XG956 wheel loader in a virtual wind tunnel using the combined engine compartment thermal management model and computational fluid dynamics. The Fluent calculations revealed various problems. For example, the inlet flow rate at both sides of the engine compartment is small, which accounts for about 8.5% of the total flow, and the flow uniformity of radiator becomes worse with the increase in the air flow. The original cooling system is improved based on the simulation results and then verified by field testing. A comparison of the test data with the simulations indicates that the values obtained using the thermal management model of the engine compartment are largely in agreement with the experimental values, with a maximum deviation of the heat transfer rate at the rated speed of 5.1%. The research method presented in this article could further help to increase the productivity of the non-road mobile machinery cooling system and lower design costs. The temperature of pressurized air, hydraulic oil, transmission oil, and engine cooling fluid decreased by 22.5%, 8.7%, 2.2%, and 8.4% in the improved loader, respectively.

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