A novel transmission concept, the uninterrupted shift (UST), is introduced in this paper, which retains most of components common or similar to normal automated transmissions such as manual dual clutch transmission, but offers an torque from engine wheels during shifting process with so-called multimode controllable shifters. An UST dynamic model established analyze UST's characteristics. The special control logic involving engine, and are put forward improve quality, applied simulation...

The CRTS I type double-block ballastless track (CRTS TDBBT) has the advantages of convenient construction and low cost, but it crack resistance temperature field distribution railway on bridge is uneven frequently changes, so necessary to study mechanical properties TDBBT under load a field. model established by finite element software, real-time bed slab brought into coupled as load, variation laws stress different schemes are compared. gradient in largest fluctuation range, positive...

To remedy the imperfection of existing power-split type multi-energy powertrain based on a planetary mechanism for HEV (Hybrid Electric Vehicle), and to increase power transmittability, efficiency variable speed range CVT (Continuously transmission) used with it, new is here put forward studied. The working principle this mechatronic assembly analysed in detail general key points its design realisation are also discussed. Its technical features applied perspective thus revealed.

To study subway turnouts’ adaptability to steep gradients, a finite element model of metro No. 9 simple turnout was established. The main works include: (1) train’s most unfavourable loading condition modelled. (2) turnout’s longitudinal displacement and stress were analysed with different gradients under the train braking load, temperature change load combination two, determine structure’s safety stability working conditions. (3) cumulative deformation reciprocating studied. Both fastener...

The cross-section of an injection-molded plate foamed long glass fiber reinforced polypropylene was analyzed using scanning electron microscopy. distribution the orientations and microcellular structure in thickness direction were also studied. A multilayer representative volume element constructed based on orientation tensors cell distribution. Nested two-step homogenization methods Mori–Tanaka Voigt models used to homogenize each layer element. Finally, classic laminate theory obtain...

Low-Vibration Tracks (LVTs) are widely used in subway tunnels for their excellent performance, but the application heavy-duty railways still requires a lot of feasibility studies. In this study, statics performance LVT under different axle loads, load direction, and position is explored using finite element software Abaqus. The Timoshenk beam nonlinear spring 3D solid to represent rails, fasteners, other track structure respectively. paper established model study mechanical characteristics...

This paper uses the long-span steel truss slab track as its research subject to analyze new type of sleeper structure with an experimental method. Firstly, a full-scale model was established in laboratory form “rail–sleeper slab–self-compacting concrete cushion–steel beam” composite structure, and fatigue test performed on structure. The cyclic load set up sine range between 75 375 kN at 5 Hz interval 3 × 106 cycles. Based test, performance under train studied. Secondly, after every loading...

With the gradual increase of cargo weight heavy-haul trains, traditional ballasted track with accumulation stone and ballast has been unable to meet its structural safety requirements. From comparison three common ballastless tracks in China, it can be seen that low-vibration (LVT) advantages reasonable structure, low cost, easy maintenance. Therefore, design research railways are focused on, is urgent study applicability LVT railways. Method: By improving slope short side support block,...

The train sometimes needs to brake frequently on the turnout, although braking force does not exceed limit resistance of fastener, cumulative displacement rail occurs because long-term effect brakes, thus, relationship between and number actions should be explored. Aiming at spring bar type III a 1:1 physical indoor simulation test was carried out, an electromagnetic relay device used simulate load, force, sensors for data collection. Then single load no more than maximum fastener applied...

Abstract Rigid body with initial velocity and no gravity contact the elastomer, this process is too short it can be described by collision. The geometry shape of surface same as contour rigid body. Under excitation velocity, particles produce motion propagate around stress wave. moving energy gradually consumed under action reaction force goes through deceleration stage. During collision process, there a continuous symmetrical pulse at surface. This paper first discusses interfacial...

To study the damping effect of different track structures on environmental vibration, field tests train-induced vertical acceleration were performed four types structures, namely, ordinary (OT), medium vibration-damping fastener (MVDFT), floating-ladder (FLT) and steel-spring floating slab (SSFST). The measurement points set rails, slabs, tunnel walls. Eventually, time domain, frequency one-third- octave division vibration level adopted to investigate characteristics structures. results...

In order to improve the speed control effect of underground belt conveyor under operating condition, ensure matches detected coal flow in real time, and prevent occurrence pile-up failure, work this paper proposes a method optimize fuzzy rules using genetic algorithm realize control. The controller optimized by program is simulated analyzed Simulink. experimental results show that when Genetic Algorithm optimizes Fuzzy Controller, overshoot system reduced 1%, steady-state error eliminated, better.

Abstract Medium damping fasteners have the advantages of low cost, easy maintenance, and convenient in gauge adjustment, etc., which are gradually widely used metro construction. In order to study performance medium a driving environment, we performed measurement on site about vertical lateral displacement rail, as well acceleration rail tunnel wall straight curved cross-section with fasteners. By comparing results ordinary fasteners, it can be seen that: (1) The fastener has vibration...