Models of machines continuous transportation with closed tractions organ

An example of how entrepreneurship can be integrated into Design-Build-Test (DBT) project courses is presented. The example is taken from the engineering program Applied Physics and Electrical Engineering at Linköping University, where entrepreneurship has been introduced in ten different DBT project courses related to the specializations of the program. The purpose of the entrepreneurship part is that the students shall acquire knowledge and abilities within the general area of entrepreneurship with particular focus on business planning for new ventures. The organization and execution of the entrepreneurship activities are described in detail together with a summary of the experiences from the first year. The results of the entrepreneurship activities within the project courses are positive and will be further developed, with emphasis on the connections between project ideas and technical contents of the courses

The dynamic simulation model of apples contact interaction

The mathematical model of apples shock interaction with each other and with working surfaces of technological equipment during their gathering, transportation and technological processing has been presented. In the model using the Hertz theory, strain and other running parameters of bodies shock interaction have been determined. To set changes to these parameters in time has been a peculiarity of the model, which allows simulate the process in the mode of the calculated experiment. The graphic change dependences of time contact forces, as well as examples of apples kinematics changes at initial angular and tangential velocities have been given

Optimisation of the screw transporting-technological systems parameters

Розроблено методику оптимізації гвинтових транспортно-технологічних систем на основі багатокритеріальної задачі, де за критерії оптимізації слугують такі критерії: за трудомісткістю виконання супутніх технологічних операцій; за енерговитратами; за матеріалоємністю, де за комплексний критерій прийнято суму вартісного еквівалента кожного використаного ресурсу. На зміну параметрів накладено 12 обмежень. Вказані обмеження задають область визначення, яка представлена узагальненою функцією обмеження у неявному вигляді. Розроблено методику розрахунку раціональних конструктивних параметрів і режимів роботи конвеєрів змішувачів у вигляді восьми основних етапів з виведеними аналітичними залежностями.The main operating and loading-unloading members of great number of elevating transporting, agricultural, road-building, processing and other machines are screw mechanisms. Their share as transporting means is about 40 – 45 % according to available data. The specific character of their operation is caused by the variety of the technological processes operations, as well as the physical-mechanical properties of loads, which specify the diversity, construction, kinematic and technological parameters. Optimisation model of screw transporting-technological systems (STTS) according to the multicriteria parameters has been developed. These criteria are: labour intensity of the technological operations performance, energy demands and materials consumption. For the STTS optimisation according to the independent variables the following ones were accepted: external diameter of the trough, relative gap between the trough and the screw external edge, flight lift tangent, conveyor speed coefficient, etc. Objective STTS function as a quadratic polynomial with 12 constraint functions defining a function domain is presented as generalized implicit constraint function. This makes possible to simplify the algorithm and to automate the calculation process on PC. As an example the screw mixer and technological process of powder materials mixing were subject to seven constraints, and minimum and maximum values of corresponding parameters were found as well as the method of their calculation was determined. Obtained relations make possible to calculate precisely the optimal construction and technological parameters of the mixer which provide the desired quality of powder materials mixture under high efficiency of the mixing process