Papers by Keyword: Load

Abstract: Dry sliding wear behaviours of polyamides of were investigated by Taguchi method using a pin-on-flat plate configuration. L9 orthogonal array and analysis of variance (ANOVA) were applied to investigate the influence of process parameters on wear rate. The experimental results indicated that Signal-to-Noise ratio (SNR) decreased with increasing elongation and decreased with increasing load slightly, but increased with increasing speed. ANOVA revealed that elongation at break exerted a great effect on the wear rate, which was followed by speed, respectively. Optimal process parameter was obtained for LFX type of polymer against smooth hardened steel.

Abstract: This article provides information about in-flight measurement of a small sport aircraft. The strain gauges were used as sensors for load monitoring on the nose landing gear structure. To obtain overall forces it was necessary to do the calibration procedure. After the calculation of strain gauge coefficients the equations for calculating of total force, total force direction and individual force components were determined. During test flights the data acquisition system was installed into the aircraft. The data from strain gauges were collected together with other flight parameters like speed, altitude and data from inertial measurement unit which determined the exact movements of the aircraft before landing. The data recorded during fifty-six flights were analysed to obtain loads acting in the aircraft structure. These results were compared with calculated values.

Abstract: The main objective of the present work is the study the experimental and numerical study of multi hole extrusion process for making circular rods. The pure lead is used as extrude material for extrusion. The die consists of 5 holes with 5mm diameter. For prediction work, process has simulated using a Finite Element Method (FEM) code metal forming software DEFORM-3D®. All the experimental work and simulation are done at ambient conditions. The maximum load and maximum ram displacement are calculated for circular rods during the experimental work. From the results, it is noted that the behavior of load vs displacement is almost same for both experimental and numerical study of multi hole extrusion process. This study becomes illustration the behavior of the other tough materials by which one can understand the extrusion behavior of nonferrous materials.

Abstract: The article dwells upon the results of study of theshape influence of size of load’s motion using the sigmoidal functions of traversingsingle obstacle on the arc with suppression of load’s oscillations to theaccuracy figure of the trajectory’s realization. The possibility of thereduction of the maximum and average error by means of the little changing of the value ofthe arc’s lateral deformation for a fixed traveling time is shown in thisarticle. The functional dependencies of the maximum and average errors oftrajectory implementation from corrected value of the maximum arc’sdisplacement of required load's trajectory in lateral side to bypass obstaclesand from increasing of corrected value of the maximum displacement of the arcare given too.

Abstract: In order to obtain the accurate thrust rod load, based on the theory of multi body dynamics, establish the complete vehicle virtual prototype model by using ADAMS software, the dynamic simulation of the thrust rod load time history. Combined with MATLAB software to build three-dimensional space pavement model with harmonic superposition method, obtaining the thrust rod load under different conditions, the simulation results show that, the vehicle loaded with uphill turn thrust rod by the load of the largest, and bear in various working upper thrust rod load than the lower load. Consistent with the experimental results, illustrate the modeling method is correct, can quickly and accurately obtain the thrust rod load.

Abstract: By biaxial test of soil particle flow simulation program, the corresponding relationship between macro and micro parameters were obtained firstly. And then the slope model was established accord with these parameters. With this model, the slope stability under load were analyzed numerically, the influences of applied loading area on slope stability and damages were compared. Results shown that a slip surface came when slope was broken under a few loaded area, which is called the main slip lines. With the movement of the sliding, other landslide cracks began to appear; when subjected to a large load area, the slope undermining the main slip line was not obvious, but there were multiple landslide fissures, along with the movement of soil, the speed of slope failure increased, and severely damaged instantly.

Abstract: The human skeleton is a mechanical device that people can wear. It put the human intelligence and the robot physical together, relying on human intelligence to control the robot. It is a man-machine system to finish by people's own ability which is unable to complete tasks by robot alone. This paper studies the inherent law and movement mechanics of human body load walking principle. The purpose is to realize the human skeletons wearing comfort and walking stability, and improve the accuracy of the body weight. Analysis of the effect of load on gait parameters provided the necessary theoretical basis for the design of human bones.

Abstract: To investigate the vibratory load of rotor with trailing edge excitation, and to study the relationship between TEF motion and hub vibratory load, a comprehensive model is built based on a conventional rotor modeling. Both the inertial force and aerodynamic force of TEF are considered. Effects of frequency, phase and amplitude of the excitation on hub vibration are discussed. The results indicate that with proper phase, hub vibration can be reduced with any of 2-5/rev trailing edge excitation. Within a reasonable range, the change in 4/rev hub vibration is more obvious with larger flap deflection. Control laws of several vibration directions are different, so various directions should be considered overall for optimal vibration control. Light TEFs are beneficial for vibration control.

Abstract: Aim of this paper is in presentation of results of static and dynamic tests of round timber bolted connections with slotted – in steel plates. Round timber joints static tests in tension were made on pressure machine. Round timber joints multicyclic (fatigue) tests in tension were made on pulsator. Results of laboratory tests have been statistically evaluated and completed by graphical records of deformation response on loading. Samples of round timber bolt connections with slotted - in steel plates were tested for carrying capacity and deformation of a single tension – up to the failure of connection.

Abstract: A stress analysis for cast compound rolls is presented. Stress is divided into components as residual stress, stress implied by load, stress implied by torque, Hertz’ian contact stress and thermal stress. Furthermore, heat transfer is considered. Residual stress is measured and a 3D representation is given. All further stress components are calculated by FEM calculations. The data allow a complete description of the roll behavior in operation.