Abstract— A series of strain‐controlled, low‐cycle fatigue experiments have been conducted on 42CrMo steel under various loading paths including circular, square, cruciform, and rectangular paths. Present shown that there is additional hardening non‐proportional cyclic loading. Non‐proportional also results in a shorter life for multiaxial low cycle fatigue. non‐proportionality measure strain path based both physical basis macromechanical phenomena proposed. The effect described well....

ABSTRACT The cyclic deformation of three structural steels, SS316L stainless steel, 40Cr3MoV bainitic steel and 25CDV4.11 were studied experimentally by uniaxial straining or stressing tests at room temperature. softening/hardening behaviours the steels discussed first tests; then effects on ratchetting materials investigated asymmetrical tests. It is concluded from experimental results that greatly depends materials, as well loading history. Different failure are observed for prescribed...

This paper presents a non-intrusive solenoid valve fault diagnosis method, which adopts the eigenvalue extraction scheme and combines time-frequency analysis time-domain of current signal through pattern recognition method. Specifically, research group selected driving end value its second-order change rate curve as characteristic curve, then it extracted parameters corresponding frequency band energy value. Then, conducted on basis signal, created multi-feature fusion feature vector input...

The study investigates the planar vibration characteristics of a radial tire with large section ratio for heavy load vehicle. A proposed model flexible belt on an elastic multi-stiffness foundation is investigated via theoretical modeling and experimental modal analysis. Additionally, parametric identification discussed. When compared conventional sidewall stiffness general car tires, analytical function derived by combining membrane feature caused inflation pressure structural deformation...

Experimental modal analysis, dynamic modeling, and parameter identification were employed to investigate the flexible beam tire model for a heavy-loaded radial tire. The in-plane bending vibration of tread is researched with model. coupled equation continuous sidewall modeled on elastic nonlinear dynamics sensitive inflation pressure obtained. features are presented experimentally different pressures. Structural parameters identified by backward genetic algorithm based error between...

This paper presents a complete tire model for heavy-load radial tires with large section ratio that is based on flexible carcass ring model, combined sidewall element two-dimensional stiffness. It also establishes analytical of stiffness heavy-duty preloaded beam deformation theory. The used to examine the ground-contact modeling heavy load and their characteristics are analyzed. Experimental theoretical results show models nonlinear elastic foundations can accurately characterize grounding...

By researching the synchronization motion of double hydraulic cylinders controlled by high-speed on-off valve, paper aims to solve shortage current system with low precision. The flow characteristic valve pulse width-frequency modulation is researched compared width modulation. mathematical equations are formulated bulk-cavity-node method in MATLAB/Simulink. collaborative control analyzed and compound algorithm simulated control. loop set up verify simulation result proposed on FESTO...

This paper presents an analytical method for predicting the electromagnetic performance in permanent magnet (PM) machine with spoke-type rotor (STR) and a proposed hybrid structure (HRS), respectively. The key of this is to combine magnetic field analysis model (MFAM) equivalent circuit model. influence irregular PM shape considered by segmentation calculation. To obtain boundary condition MFAM, respectively, two methods on side are proposed. In STR, average flux density core outer-surface...

The moving process of a leveling and erecting mechanism is complicated, which involves six hydraulic cylinders. research established mathematical model optimized the mechanism. Kinematic analysis was accomplished. Mathematical system established. Working scheme designed consisting workflow, trajectory planning, strategy control method. mechanical, models were respectively in Pro/E, ADAMS, AMESim Simulink software. Co-simulation carried out to validate scheme. Experiment completed on...

Erection mechanism is a complicated system suffering from nonlinearities, uncertainties and disturbances. It difficult to establish mathematical model perform high precision control using linear methods. In this study, adaptive fuzzy sliding mode algorithm was designed erection mechanism. The proposed method combines the advantages of logic control. structure partially unknown does not require bounds uncertainty be known. Fuzzy used approximate parts system. chattering phenomenon eliminated...

The in-plane vibration characteristic of time and frequency domain for heavy-loaded radial tire with a larger flat ratio (close to 1) is researched by utilizing the rigid-elastic coupled model continuous sidewall. sidewall bending stiffness considered flexible beam on elastic proposed investigated analytically simulate within more wider band. derived finite difference method analytical matrix; mass matrix formed based geometrical structural parameters tire. Structural are identified genetic...

Considering an aircraft threatened by interceptor, one of the effective penetration strategies is to release a Defender from confront interceptor. In this case, aircraft, Defender, and interceptor constitute three-body guidance relationship, cooperation its achieve best tactical effects turns into concerned problem. This paper studies triangle interception problem via finite-time theory. The presents linear system Input-Output Finite-Time Stabilization (IO-FTS) method. sufficient conditions...

The density and size of short cracks on the surface 1Cr18Ni9Ti stainless steel smooth specimens during low cycle fatigue are investigated using a replica technique. data analysed from two different observation policies, i.e. Policy I pays attention to whole specimen test piece II is related an ‘effective crack criterion’, which dominant (DC) initiation zone zones ahead DC tips. results reveal that both evolution exhibit specific character microstructural (MSC) physical (PSC) stages. I‐based...

Experimental modal analysis, dynamic modeling and parameter identification is employed to investigate the in-plane vibration characteristic of a heavy-loaded radial tire with larger flat ratio. In-plane modeled as flexible beam on modified elastic foundation model tread distributed sidewall are respectively Euler mass element sectional stiffness. Analytic relationship between resonant frequency structural parameters solved derived expansion method. The coupling investigated experimentally....