Měření statických charakteristik pneumatických motorů s elastickými pracovními členy

Into a category of pneumatic motors with elastic working parts belong air bellows, diaphragm motors and fluid muscles. All three types of these motors have some elastic part usually made of rubber. This part is deformed under the pressure of a compressed air or a mass load resulting in a final working effect. This paper deals with measuring of static characteristics of these motors.V tomto příspěvku se zabývám měřením statických charakteristik pneumatických motorů s elastickými pracovními členy. Do kategorie těchto pneumatických motorů řadíme měchové motory, membránové motory a fluidní svaly. Všechny tři typy těchto pneumatických motorů obsahují nějakou elastickou část. Tato elastická část je deformována za působení stlačeného vzduchu nebo od hmotného zatížení, čímž je dosažen výsledný pracovní účinek

Comparison of Two Methods of Pneumatic Mechanisms Simulation

Import 31/08/2009Porovnání dvou způsobů modelování pneumatických mechanismů. První metodou je modelování pneumatických průtočných prvků pomocí zvukové vodivosti C a kritického tlakového poměru b a pneumomotorů pomocí pohybových a termodynamických rovnic. Druhá metoda modelování pneumatických mechanismů je pomocí RHD odporů. Výsledky porovnání jsou uvedeny v grafické podobě, formou charakteristik.Comparasion of two Methods of pneumatic mechanisms simulation. The first method is simulation pneumatic throat valves by the help of sound conductivity C and critical compressive rate b and, pneumatic engine by the help of kinetic and thermodynamic quadratics. The second method simulation pneumatic mechanisms is by the help of RHD resistances. The Results of comparision are mentioned in graphic form.Prezenční338 - Katedra hydromechaniky a hydraulických zařízenívýborn

Experimental verification of pneumatic elements mathematical models in Matlab-Simulink Simscape

The paper deal with a mathematical model of a pneumatic system and simulation of its behaviour. In the Matlab-Simulink Simscape program, there are models of basic elements from which it is possible to build a model of the entire system. The article describes the gradual testing of pneumatic elements mathematical models on the base of comparison with experimental data.Web of Science20236363635

The proposal of the closure element pipe

The present paper summarizes the basic equations describing the behavior of butterfly valves during the fluid flow. Butterfly valves are used as a safety element in the energy industry, petrochemical industry, in steam lines etc. The paper describes the theoretical determination of the control torque on the closure element, the torque causes the opening and closing of butterfly valve. Determination of this torque depends on many factors, geometry of the closure element, misalignment to the axis of fluid flow, control method of valve, method of imposition of the moving member and of course on the operating parameters. Correct determination of the torque affects the proper design butterfly valves and ensure its functionality, which can prevent damage to other elements of the monitoring system

Test of doors obstruction detection sensor

In bus and train transport there are a number of requirements for the safety of the entrance door. For example there are requirements to provide obstruction detection within the door system. This should reverse the movement of the door should a passenger or some other obstruction restrict the doors operation. In case the door movement is realized by a pneumatic cylinder, obstruction detection can be achieved either by using a sensitive edge or by sensing of the door actuator pressure. Detection valve providing an electrical or pneumatic output signal to the door control system to initiate door opening. The pinching time of the subject or person must not exceed 1 s. This article describes the main safety requirements for door systems of intercity traffic trains and, above all, experimental verification of obstruction detection valve behaviour.Web of Science20192901289

Experimental analysis of fluidic muscles

Fluidic muscles have been the subject of research since the 1930s to the present day. McKibben's muscle is one of the most common ones. This type is the basis for fluidic muscles already being used commercially. The power-to-weight ratio is one of their main advantages. The disadvantage is difficult handling. The article describes experimental verification of static characteristics of fluidic muscles. During muscle contraction, a tensile force is developed which changes as the length of the muscle changes. This dependence is experimentally verified. A measuring equipment for testing fluidic muscles of various lengths and diameters is designed and assembled. The device consists of a pneumatic circuit, where the output drive is a loaded fluidic muscle. The load of muscle is generated by a hydraulic cylinder. The results will be further applicable to fluidic muscle simulations.Web of Science20225763575

Valve control of drive with rotary hydraulic motor

The paper describes the analysis of a valve control of a drive with a rotary hydraulic motor. The valve control is realized by a throttle valve. The individual drive characteristics are measured on the experimental device, i.e. the control and the torquespeed characteristics. The experimentally determined characteristics are compared to the theoretically calculated characteristics. Subsequently, the efficiencies of the tested rotary hydraulic motor are experimentally determined, i.e. the volumetric, mechanical-hydraulic and total efficiencies. The theoretical computational equations are subsequently supplemented by the experimentally determined efficiencies of the hydraulic motor. Theoretically determined characteristics of the drive, including efficiencies of the hydraulic motor, are again compared to the experimentally determined characteristics. The mathematical model of the experimental device is also assembled. This mathematical model is verified in a steady state.Web of Science20192909290

Experimental device for measuring of resistances and characteristics of pneumatic throat valves

Import 02/11/2007Prezenční338 - Katedra hydromechaniky a hydraulických zařízen