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Diagram of changes in vibrational frequency with changeable angle of boom lifting, analytical method
Source publication
In this paper, the modelling of and research into the vibrations of a truck crane are considered. The finite element method, using a COSMOS/M package, was applied to build the model and an analytical method was used to build a discrete-continuous model of the crane. The research concerns changes in the frequency of vibrations for flexural vibra-tio...
Context in source publication
Context 1
... analysis of the research results on the basis of the two models pre- sented in the paper allows the following conclusions to be drawn: -good agreement between changes in the vibrational frequency of the system with a changeable value of load and length of the boom (Figs. 4 and 5) was ob- tained, agreement in the results concerns both the values of the obtained vibra- tional frequency as well as the character of their changes -in the case of research into the influence of the boom length and the angle of its inclination (Figs 6 and 7), agreement in the character of changes in vibra- tional frequency and their values above a boom length equal to l t = 15 m was obtained. Similar vibrational frequencies with slightly different characters of their changes were obtained for smaller lengths of the boom -agreement in the obtained results indicates the correctness of the built models. ...
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Citations
... He concluded that flexibility of loader boom is significant in terms of obtained results in frequency analysis. In paper [4] authors besides building analytical model using Hamilton principle, applied finite element method. They compared the results obtained with both methods and achieved good agreement between changes in the frequencies. ...
... Later works considered the influence of the remaining units of a truck crane, including the crane boom, on the free vibrations of the crane. Works on the verification of a discretecontinuous model and FEM model of a truck crane were also published [11]. This work is a continuation of research into the crane system [12,13,14] taking into account changes in the crane radius and a variable value of the load. ...
... In the research conducted into a comparison of MES model and the analytical model, change in curve for different lengths of ropes was stated for the "G" form. It depends on an increase in the load value pointed out in work [11]. ...
A model of a truck crane, consisting of the fundamental units of the crane, is presented in this paper. The finite element method and a COSMOS/M package were applied to perform the modelling. Research into the influence of a change in the crane radius and load location on changes in the chosen free vibrations was carried out using the built models. Diagrams containing changes in the frequency of vibrations for chosen values of the crane radius and the load are presented and conclusions are drawn.
... Analysis of dynamic stability of truck crane was presented in the study [3], whereas the study [4] examined its free and parametric vibrations. The methods of positioning of load location and its effect on vibration of a truck crane were presented in the studies [5][6][7]. In most of the above studied, modelling of a cylinder that changes the boom radius was simplified, whereas the effect of damping has not been taken into consideration. ...
... Solutions of equations (6) are in the form: ...
This study formulates and solves the problem of transverse damped vibration in the system of changing the boom radius in a truck crane with advanced cylinder design for controlling the boom radius. The dissipation of vibration energy in the model adopted in the study occurs as a result of internal damping of the viscoelastic material (rheological Kelvin-Voigt model) of the beams that model the system and movement resistance in the supports of the cylinder and crane boom to the bodywork frame of the crane. Damped frequencies of vibrations and degree of vibration amplitude decay were calculated. The study also presents eigenvalues of system vibration with respect to changes in damping coefficients and system geometry for a selected load.
... The paper [17] analysed dynamic stability of truck crane depending on the angular ball bearing deformation at connection between the substructure and superstructure through dynamic model with five degrees of freedom. A discrete model of truck crane and examination of oscillations while lifting the payload, depending on the length and the angle of inclination of the boom, are presented in paper [18]. Minimisation of load in relation to oscillation while lifting the payload and rotation of the boom was presented in paper [19]. ...
This paper presents the analysis of local stress increases at the contact zone between the inner and outer segments of telescopic booms of truck cranes. A portion with a relevant length was singled out of the outer segment and a mathematical model was created describing its stress–strain state as a function of geometrical parameters. The obtained results were verified by the finite element method as well as by experimental testing of the truck crane TD-6/8. Comparison of results revealed high compliance between the analytical model and the results obtained by the finite element method and experimental testing, which confirmed all the hypotheses. The presented methodology as well as the verified analytical expressions give guidelines for optimum design of box-like telescopic segments and other structures with local stress increase in contact zone.
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This paper presents a comparative analysis of two kinematic structures of the support system (with supports with bilateral and unilateral constraints), which were used in an experimental model of a crane. The computational model was developed by using the ADAMS software. The impact of the kinematic structure of the support system on selected kinematic and dynamic values that were recorded during the slewing motion was analysed. It was found, among other things, that an increased number of degrees of freedom of the support system leads to multiple distortions of time characteristics of kinematic and dynamic quantities.
Parametric modelling and finite elements study for the crane boom was done in Catia V5R20 software. 3D modelling was done considering the load diagram. This is the basic feature for this study because it gives us information between the main elements (lifting capacity, outreach, boom length lifting height) which define crane operation possibilities. The truck crane is installed on the standard undercarriage of a truck or specially built undercarriages, the engine that drives the undercarriage serving either just for equipment travel or also for driving the crane mechanism. When the engine on undercarriage is only for travel, the truck crane is provided with an additional auxiliary engine, exclusively intended for crane mechanisms operation. The studied boom belongs to Liebherr crane. For parametric modelling measurements on an existing model were needed. Finite elements study was done on the basis of virtual model using a specialized soft. We did a static study by which we determined the static parameters of the structure (stresses, deformations, safety coefficient), for all own rates within interest range. The next aim, using the parameters, is to build the static model of reaction. Any static deformation of a structure can be represented as a weighted sum of structure’s own modes, each knot can be represented as a system with only one degree of freedom. This kind of study allows us to find which is the maximum deformation, the stresses and value of safety coefficient borne by a technical system or machinery under movement or static condition.
The visual characteristics of the product’s form are often definitive for the customer’s choice. Product designers can successfully use methods to achieve dynamic visual potential (like evading symmetry, generating specific important elements, applying colorful or graphic gradients etc.) so they can avoid templates and predictable shapes. Ever since the creation of design as a profession the accent in the visual characteristic of the product’s form is defined by different conceptual specifics, that are based on the chosen technology for work. Providing the shape’s visual dynamic is dictated by specific requirements, that are touched upon in the following report.
Keywords: VISUAL DYNAMIC, METHOD, VISUAL CHARACTERISTICS, DYNAMIC POTENTIAL, PRODUCT DESIGN
http://mtmcongress.com/summer/sbornik/2016-3.pdf
Today׳s crane numerical models are devoid of some of the simplifications that were used in the past. These changes primarily take into account flexibilities of those structural components that used to be treated as non-deformable. Consequently, various studies analyse the same working movements based on different models.
The paper presents ten variants of a computational model for a telescopic boom crane that differs in number and selection of flexible components. It has been analysed how the above-mentioned differences affect the correctness of mapping the dynamic properties of real structures via their computational models. Modelling and numerical simulations were conducted using the finite element method. The compatibility of the numerical simulation results and test results of a real structure was qualitatively and quantitatively assessed. Time characteristics and frequency characteristics after application of the discrete Fourier transformation were analysed. The analyses showed that the parameters of the modified components should be determined by taking into account their interactions with their surroundings in order to ensure correctness of the solutions. A comparison of the shape and position of spectral lines with respect to changes in the overall flexibility of the models facilitates in deciding which components should be modified and which should be omitted in order to correctly imitate the dynamic properties of a real structure.
