Serwis Infona wykorzystuje pliki cookies (ciasteczka). Są to wartości tekstowe, zapamiętywane przez przeglądarkę na urządzeniu użytkownika. Nasz serwis ma dostęp do tych wartości oraz wykorzystuje je do zapamiętania danych dotyczących użytkownika, takich jak np. ustawienia (typu widok ekranu, wybór języka interfejsu), zapamiętanie zalogowania. Korzystanie z serwisu Infona oznacza zgodę na zapis informacji i ich wykorzystanie dla celów korzytania z serwisu. Więcej informacji można znaleźć w Polityce prywatności oraz Regulaminie serwisu. Zamknięcie tego okienka potwierdza zapoznanie się z informacją o plikach cookies, akceptację polityki prywatności i regulaminu oraz sposobu wykorzystywania plików cookies w serwisie. Możesz zmienić ustawienia obsługi cookies w swojej przeglądarce.
As one of the most important means and trends of modern products' design and serialization, parametric modeling is beneficial to the building and management of products' part library so as to monitor the cost. Flexure hinges are the essential kinematic pair in compliant mechanism, realizing motion and transmission of power. The design of flexure hinges is the key to that of compliant mechanism. This...
The influence analysis of geometry errors on the contact characteristics of ball screw mechanism, such as the contact deformation, contact angle, etc. is theoretically investigated. The results demonstrate that the negative geometry errors of the ball screw result in the decrease of the contact deformation on balls or guiding grooves, and when the negative errors reach certain value there is no contact...
The deformation of a TVM's body frame was calculated and the structural FEA (Finite Element Analysis) was accomplished in this paper. The geometric model and finite element model of TVM (Ticket Vending Machine) were built. To locate the maximum stress and displacement precisely, structural analysis of the TVM's body frame under its gravity was analyzed by FEA software. The results indicate that the...
Assembly planning is one of the NP complete problems, which is harder to solve complex product. Decomposition of a complex product into smaller units is an effective method to solve this problem. This study presents a simple and an effective approach to partition assembly based on the law of universal gravity. Assembly product is expressed as assembly semantic relation model (ASRM). The algorithm...
Through similar model test and theoretical analysis, the beam-arch compound structure was put forward based on the theory on anchorage body strengthening and the theory on arch. In view of compound structure's characteristic of bearing capacity and self-supporting ability, the anchoring parameters were determined according to the structure's stability. According to Coulomb criterion, the roof bolt...
This paper aimed at the drop simulation of portable instruments which can easily fall off when be used. A basic model is founded to represent the complex portable instruments in analysis by FEM. The paper provide a representative method for the drop simulation of portable instruments.
At present, three-dimensional parametric CAD technology is used widely in the field of agricultural mechanical design. Based on the analysis of matsune shovel's structural features for the stubble harvester machine, matsune shovel solid model was drawn by using three-dimensional CAD software Pro/E. Matsune shovel's static analysis was done by finite element analysis software ANSYS Workbench, and static...
According to the surrounding rock stability type determined through fuzzy comprehensive evaluation, bolt and cable support parameters for thick soft coal roadway were selected based on the engineering analogy method. Considering two conditions that the roadway was arranged along the roof and along the floor, the activity law of the roadway surrounding rock was simulated through Fast Lagrangian Analysis...
A new type of high speed vertical machining center which adopt gantry type structure is introduced. And study on influence of guide screw as a significant part in static and dynamic analysis. In this paper, it is proved that results will be accurate, if guide screw is considered when processing a static and dynamic analysis. Finally conclude a precise method of carrying on static and dynamic analysis...
The dynamic working process of the chamber system of shield machine was modeled by discrete element method. Taking the shield machine tunneling in a railway line as the research object, the geometry structure and size of the model was determined. The particle model parameters were calibrated by the triaxial test curves of the soils from the railway ground. Comparing the numerical simulation results...
The transportation of bulk materials is of importance in many industrial applications, ranging from minerals, agriculture, pharmaceuticals, chemicals, pigments, plastics, cement, sand, salt and food processing. Screw conveyors are widely used for transportation of particulates at controlled and steady rates. In this paper, we use the Discrete Element Method (DEM) to analyze the performance of a screw...
The lifting winch drum usually bearing a relatively large load and there will be many irrational design problems, when the key coupling is used. For example, the strength of key coupling between the drum shaft and drum body can't meet the strength requirement. The expansion bushing, a type of non-key coupling connection, is introduced to solve these problems. The parameter performances of five common...
The application of FRP screw anchor, geogrid, geofoam slab and geosynthetics clay liner (GCL) in repairing slide of canal slope of expansive soils has been introduced in this paper. The FRP screw anchor was used to anchor the concrete frame girder above the berm and concrete slab below the beam, the geogrid improved the factor of safety against complete sliding surface, the geofoam slab was used to...
This paper studies the nonlinear vibration of robotic manipulator with parallelogram hinged mechanism while it motioned in plane. The controllable motor and the hinged mechanism are studied in an integrated manner, and the electromechanical coupling nonlinear dynamic equation of the system is established by finite element method. The relation between the nonlinear vibration of the system and the parameters...
This paper presents a novel simple method, IMGA, to solve the instantaneous motion problem of parallel mechanism. Based on the geometric regularity between constraints and motion of rigid body, IMGA method can be used to judge all the feasible instantaneous motion of parallel mechanism, and the type synthesis of instantaneous motion-free parallel mechanism. Based on the 3-PRS parallel mechanism, two...
A family of spherical parallel mechanisms which have fully decoupled motions is presented in this paper. The condition required for synthesizing the fully decoupled parallel mechanism is derived from the screw formulation of Jacobian matrix. According to this condition, several novel decoupled spherical parallel mechanisms are obtained. The decoupled motions are validated by the simulation of the...
An improved torque control method-torque/time control method is proposed. The correlation between torque and Pre-tightening force is theoretically analyzed in the bolt joint assembly procedure, from which the equation of the torque and pre-tightening force is acquired in a system of stiffness invariable. When take the slope of torque-time changing and system stiffness of joint parts into consideration,...
In this paper, based on the measured test data of the production quality of Jiefang Truck assembly line, the improved AHP is used to analyze the factors which affect the quality combining with the characteristics of quality influencing factors. And the results demonstrate its effectiveness. According to the main factors affecting the quality of Jiefang Truck assembly line, some improvements are put...
The components spatial dispersion has important effect on the dynamic response of large machine tool feed system. Aimed at large milling gear machine, distributed parameter method was used to represent the influence of continuous distributed torsion in slender ball screw. Lumped parameter method was used to model AC servo system and worktable drive system. Finally, a complete distributed-lumped model...
A new hybrid macro-and micro-range fast tool servo (FTS) system is developed that enables diamond turning of optical free-form surfaces. The macro-range FTS is driven by a voice coil motor (VCM), and a PZT actuator is used to drive the micro-range FTS, both of which are guided by flexure hinge. The output force of the VCM is enlarged by a lever. A high resolution laser sensor is utilized to measure...
Podaj zakres dat dla filtrowania wyświetlonych wyników. Możesz podać datę początkową, końcową lub obie daty. Daty możesz wpisać ręcznie lub wybrać za pomocą kalendarza.