This study analyzes the blast resistance in triple-period minimal surface (TPMS) sandwich panel structures with a cellular structure. The explosion test of TPMS was carried out, and experimental data verified effectiveness finite element model. Four configurations, Diamond, Gyroid, IWP, Primitive, were selected as core to determine dynamic response process under action load. effects thickness material explosive charge on investigated. results show that increase reduces energy absorption...

Abstract In view of the lack relevant research on CNC grinders in field reliability machine tools at present, This collected data based 19 MSK series grinder a tool factory., found out crucial subsystem which is most important component to whole, and analyzed adopting FTA (Fault Tree Analysis) . Statistical researched 438 collected, combining with actual production situation, results shows that cooling system key whole tool. The 29 minimum cut sets obtained by can be adjusted improve system,...

In order to ensure the safe operation of buried polyethylene pipelines adjacent blasting excavations, controlling effects vibration loads on is a key concern. Model tests under were designed and implemented, velocity dynamic strain response obtained using TC-4850 blast vibrometer UT-3408 tester, distribution characteristics analyzed based experimental data. The results show that load has greatest effect circumferential pipe, at section pipe nearest source. Pipe peak (PPVV), ground particle...

In this paper, the geometric error modeling and sensitivity analysis method was established to improve compound machining accuracy of NC machine tools. Use CHD-25 type 9-axis 5 linkage turning-milling tool as a research object, based on multi-body system theory (MBS), developed. The model involves 37 items geometrical errors. By calculating analyzing coefficient, key errors that affect precision are identified finally, which provides an effective theoretical basis for design CNC

Abstract In order to improve grinding accuracy, it is necessary analyze and study geometric thermal errors of NC machine tools. Based on the method coordinate transformation multi-body system theory, error matrix cutting points established in workpiece tool kinematic chains. The coupling relationship between analyzed, comprehensive mathematical model CNC internal external grinder deduced. precise machining constraint equation established, which lays a theoretical foundation for subsequent...

Planning is important in the process of engineering reliability and growth. models related curves are always influenced by their intrinsic parameters. However, there little research on relationship between planning inherent This study examines relationships model based projection methodology (PM2 model) its four The results have shown that all parameters a significant influence growth-planning curve. Moreover, they reveal some minimum limits. By prejudging model, risk not achieving test...

Abstract Aiming at the problem of detection inner wall surface solid rocket motor, design expansion existing endoscope device cantilever has reached 3.5m. In order to meet measurement accuracy requirements, static and modal analysis optimization stepping industrial camera whole are carried out based on ANSYS software platform. Ensure that mechanical characteristics can ensure working frequency motor avoids natural cantilever, so shooting environment is relatively stable, resonance will occur...

Fault distribution type identification and probability density function parameters estimation are the prerequisite of CNC grinding machine tools' reliability assessment.The procedure fault data grouping, technique based on least square method index( mean time between failures, MTBF) calculation proposed.The curve fitting, comparison goodness fit, MTBF solution some crankshaft carried out by proposed in paper.The results statistical direct definition close.The assessment here can be...

CNC grinding machine is the most commonly used finishing machine, lathe bed foundation of tool key parts, as well guarantee for dynamic stiffness.Taking a research object, using Pro/E software to create geometry model, and finite element ANSYS Workbench simplified modal analysis.Through analysis find out weak link resonant frequency.In order improve characteristic bed, without changing job characteristics difficult processing conditions, puts forward several improvement program, again on...

Aims at AOCMT type five-axis ultra-precision CNC machine tool, the rotary axis geometric errors model is established by applying homogeneous coordinate transformation matrix, a kind of measurement and identification method put forward.It takes A as an example, using function RTCP to control two translational axes synchronous movement.Different height positions are designed, modes axial, radial tangential.The length variations acquired, relational expressions deviations derived according...

This paper present on an new error identification approach B rotary axe geometric for a non-orthogonal five-axe CNC machine tool research is not enough in the domestic and abroad, establish motion model of based multi-body system theory (MBS), there are total 12 static errors dynamic this model. Design eight different measurement method to measure errors. Finally realizing by combine results. can be used results accurate after test verification.

Taking certain CNC camshaft grinder as the subject its motion error analysis and modeling were studied. The movement forms types of errors between moving parts analysed, coordinate systems adjacent bodies was used to express two bodies, ideal equation actual in case set up. Actual made further extended analyse arbitrary low-order body arrays, which provides a theoretical basis for studying multi-branch grinding machine modeling. Complex chain simplified simple multibody system, corresponding...

Abstract Taking certain type of CNC camshaft grinders as the research object, through analysis its structure and movement to determine a total 21 error parameters, model describing motion relations between adjacent body coordinate systems containing parameters was established. The machine movements were classified into two kinematic chains: “bed-workpiece” “bed-tool”. topological tool built then multi-body system theory applied errors tool. Body reference set up on each moving corresponding...

To obtain the reliable growth planning curve in whole process of reliability test, technology has developed and become an important part plan. Reliability models, are generally used to describe plans produce curves. It is found that two widely CE model PM2 model, can very different curves even under same input conditions. However, there few papers study relationship difference these models. This paper gives a comparison models by studying on relationships between parameters corresponding...

Based on the theory of multi-body system and homogeneous coordinate transformation, this paper analyses error five-axis CNC machine tool establishes machining precision model firstly. Then taking double wall tools as an example according to structure assembly relationship key parts, geometric errors are analyzed. Meanwhile, systems all components characteristic matrix among bodies established. Finally, Machining Accuracy Model Machine Tool was It lays foundation for accuracy subsequent design work.

Abstract In order to solve the problem of large deflection caused by insufficient rigidity existing three-stage cylinder cantilever mechanism, a new design scheme is proposed. By installing lifting hydraulic at front end first stage multi-stage and hinged structure back cylinder, pitch angle whole changed compensate cantilever. The simulation data fitting are carried out using ANSYS MATLAB software, measurement mode laser rangefinder improved, electrical control system device optimized....