Applied Mechanics and Materials Vols. 215-216

Abstract: In this paper, the traveling characteristic value of moving jaw of jaw crusher is studied by optimization experiment. The traveling characteristic value can reflect the relationship between capacity and energy consumption of jaw crusher. When it is around 2.5, the capacity of jaw crusher is high and the energy consumption is low. The virtual prototype model of jaw crusher was established and an orthogonal experiment was done to find the effect of four design variables on the traveling characteristic value. The results show that the angle of oscillation is the most important influencing factor and the least one is the length of toggle plate. The length of link bar and the eccentricity of eccentric shaft are less important factors. And the better design parameter values of PE1500*1800 was obtained.

Abstract: In the deep-hole drilling process, chips can not be easily removed, so the influence factors of the negative-pressure removing-chips were analyzed on the existing DF negative-pressure removing-chip mechanism by the hydraulic pressure theory and the injection angle κ and negative pressure gap S were analyzed with FLUENT software. The results show that negative pressure effect were best in 32°of κ and 0.4 mm of S and negative pressure effect are better in 28°of κ and 0.5mm of S , which lay good theoretical foundation for the optimization and characteristics of negative pressure mechanism in near-dry deep-hole drilling.

Abstract: Past mowers only work on flat ground and are difficult to adapt to the slope lawn job. To improve this situation, some improvements in the transmission system are made by referring to properties and parameters of the similar mechanical. Then a mower is designed for operating on slope and structural simulation is made by Pro/E. The mower has the characteristic of self-propelled mower because it is driven by engine and rear wheel can get suitable driving force through triple reduction of belt drive, worm drive and gear drive. Also machine can operate on slopes with good lubrication. This will undoubtedly make significant and effective contribution to a further development of more advanced congeneric product.

Abstract: Today, transmission systems are playing important roles in engineering. For all of the components in them, status of the rolling bearing has been rising. In modern times, people are making great efforts on the optimization of transmission system. At the same time, optimization design of all the internal components was also important. For all the techniques, research to the rolling bearings has become increasingly mature. In this paper, the rolling bearing in growth of box of the 2 MW wind generator was took as the research object. The load coefficient of rolling bearing was been calculated, then the reliability assessment model of the rolling bearing was been made. On the basis of which, the optimization design on the reliability was done.

Abstract: A new banana-stem shattering and returning machine which was designed by using a roller to prevent fiber from tangling solved the problem of preventing the roller from being tangled by fiber in a better way. Field test showed that fuel consumption per unit time was reduced by about 4%, shattering rate improved by about 5%, and the banana-stem shattering quality and agronomic requirements were met. Through theoretical analysis and field test, the structures and main parameters of such key components as swinging cutters and cutter rollers were determined.

Abstract: In today’s world of industrialization, no single branch of Engineering and Technology can be considered independently. In order to increase productivity and profitability, industrial products are designed with the technology involving Mechanical and Electronics principles i.e. Mechatronics. Mechatronics has a vital importance in various fields such as agricultural, aviation, automobile, medical, etc. The scope of present work is to design, manufacture and test the low cost knee Continuous Passive Motion (CPM) machine. By using motorized device of CPM machine, we can gradually move the knee joints. This is not possible actively to the patient due to pain. The knee joint motion without patient’s muscular effort is called as passive motion. The machine designed and developed in present work can achieve this. Once the patient is able to use his muscular power for his active joint motion, CPM is no longer medically necessary. In the present work, design and manufacturing of the Low Cost Knee CPM machine has been successfully done and is elaborated. The machine was manufactured and tested at one of the renowned Hospitals in Sholapur-India. The patient is exercised on CPM machine for three weeks and is observed to be improved to normal condition i.e. normal Range of Motion (ROM).

Abstract: Covariance matrix adaptation evolution strategy algorithm (CMA-ES) is a newly evolution algorithm. It has become a powerful tool for solving highly nonlinear multi-peak optimization problems. In many real-world optimization problems, the location of multiple optima is often required in a search space. In order to evaluate the solution, thousands of fitness function evaluations are involved that is a time consuming or expensive processes. Therefore, conventional stochastic optimization methods meet a special challenge for a very large number of problem function evaluations. Aiming to overcome the shortcoming of stochastic optimization methods in the high calculation cost, a truss optimal method based on CMA-ES algorithm is proposed and applied to solve the section and shape optimization problems of trusses. The study results show that the method is feasible and has the advantages of high accuracy, high efficiency and easy implementation.

Abstract: For straight-line linkage synthesis with Ball or Burmerster points, the traditional calculating method is separated, and lack of unitarity. In this paper, we derived the general formulae of kinematic analysis for link-point of four-bar mechanism, including velocity, acceleration, one time rate of acceleration change, and two times rate of acceleration. So the four-bar straight-line linkage whether with Ball or Burmester point can be verified. And then, the synthesis methods are unified theoretically. An illustrative example is given to verify the correctness of formulae derived. This approach is a novel analytical method for verifying and synthesis four-bar linkages with four and five infinitesimally separated positions of the point falling on a straight-line.

Abstract: The study describes the characteristic of field seedling vacuum-vibration tray precision seeder, discuses the necessity for horizontal adjustment on the precision seeder. Horizontal adjustment parallel mechanism is designed, DOF and characteristics of parallel mechanism’s moving platform are systematically analysized, proved the mechanism can meet the horizontal adjustment of two-level tilt angle,which provided a theoretical basis for horizontal adjustment of the seeder.

Abstract: Lemniscate type crane is used for water transhipment operation. There are great differences in outward appearance, geometric shape, luffing performance between lemniscate type crane and normal double-link type crane. Lemniscate type crane has some advantages, i.e. lower centre of weight, practical and reasonable structure, strongly anti-wind, upwarp of flying jib invariably and easy operation. Luffing mechanism of lemniscate type crane has two driving methods, one is boom driving, another back-rocker driving. Based on comparison research, the equations of kinematics of two luffing mechanisms are obtained. Luffing characters of lemniscate type crane are more better.