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Aiming at the impact damage of transmission steel structure tower coating in Xinjiang, the dynamic impact mechanics behavior of transmission steel structure tower coating under simulated single particle impact was studied by automatic sphere impact tester and digital image correlation experiment measuring system. The three-dimensional morphological features of impact damage were analyzed by laser...
The thin-walled parts of the tank are widely used in aerospace filed and the accuracy is the basis requirement for ensuring the usability. Due to the low rigidity of the thin-walled parts, the milling force becomes a major factor for the machining deformation. Based on analysis the relationship between feed speed and the length of the cutting arc, the feed speed optimization method is proposed to...
Serious sealing problems cause premature retirement of Lithium-ion punch cells in the service stage. This paper mainly investigates the sealing failure behavior of Li-ion punch cell. A non-linear peeling model was established with experimental verification to explain the failure behavior of sealing cohesive zone. Based on the peeling model, a sealing life prediction method is proposed by describing...
To improve the mobility of locomotive devices on loose, sandy terrain, protrusions or convex patterns called lugs (i.e., grousers) are attached to the surface of a locomotive modulus. Following our previous study, in which the effects of angular speed, lug sinkage length, and soil cumulative deformation on lug-soil interaction forces during the fixed-axis rotational motion were experimentally confirmed,...
A method utilizing one Phase-shifted Fiber Bragg Grating (PS-FBG) and adaptive particle swarm optimization (APSO) algorithm has been proposed to simultaneously measure the spatial multiple axial stresses, including axial stress and transversal stress. The swarm success rate based dynamic adaptive strategy for the adjusting of inertia weight has been introduced to balance the exploration and exploitation...
This paper presents an analysis of effect of external load on hemispherical resonator gyroscope (HRG) feedback control system with state constraint. Firstly, the analytical solution of dynamic equation under multi-electrode excitation is obtained based on dynamic equations of resonator in the second-order resonant state. Through analysis, two main reasons that external load influences feedback control...
Wounds are a major public health issue worldwide and have become a great challenge for the health care system. Pharmacologic methods are costly and not effective. Two promising physical techniques are used to accelerate wound healing: the mechanical vacuum-assisted closure (VAC) therapy and the more affordable and safer electromagnetic field therapies, including pulsed electromagnetic fields (PEMF),...
In this paper, we introduce a real-time pressure measurement system. A soft material with gauge points is placed ahead of a micro camera, and the material's deformation reflects the pressure applied on it. The image processing circuit mainly consists of an image pre-processing module, a connected area labeled module and a centroid coordinate calculation module. Experiments are implemented to demonstrate...
In this paper, the research of the dynamics for the constant force polishing robot system as the goal, through the establishment of the dynamics equations for the end of the robot polishing, a modal analysis of the end of the robot is analyzed. It is obtained its static characteristic and vibration characteristics by the analysis results and verified the meeting requirements of the stiffness and the...
In this paper, the force analysis of the blade roller of the tiny cultivator is described firstly. The static analysis of the blade is carried out by using the Simulation plug of SolidWorks, and the data of von mises stress, resultant displacement, equivalent strain and safety factor of the blade are obtained. Then the modal analysis of the blade roller is carried out, and the data of the top ten...
High speed repulsion mechanism is the key component of Hybrid DC circuit breaker, whose properties and reliability directly determine whether the fault short-circuit current can be quickly broken off. The driving force, produced by the eddy current effect, reach tens of kilo Newton in 100μs, which means the huge impact on motion component. Due to its characteristics, it is necessary to check the strength...
In the present world there is a lack of methods to detect alterations in live human tissues during disease conditions (ex: Osteoporosis). Most importantly existing expensive methods such as Dual-energy X-ray absorptiometry (DEXA) do not provide 100% valid results on bone mechanical properties, since all the results are depending only on BMD values. Therefore, a novel sensor mechanism was developed...
Monolayer graphene transferred over flexible polyvinyl chloride (PVC) substrate combined with closely packed layer of nano-spheres (NSs) is fabricated for force sensing application. The force was applied from vertical direction through NSs which acts as lateral strain enhancers. The stack persuades lateral in-plane strain in the monolayer graphene for the applied vertical pressure through NSs. The...
The tensile testing machine was constructed for determination of true stress and strain of carbon steel and image processing technique was proposed to detect a projection diameter of the specimen for actual area calculation. The main components of the tensile testing machine consists of a hydraulic cylinder and a hydraulic unit to proceed the tension force, upper and lower grippers to clamp the specimen,...
Myocardial elastance, derived from pressure-volume (PV) loops in the left ventricle (LV), can be used to assess LV function and myocardial performance. This method requires an invasive intracardiac pressure-volume catheter to be inserted in the LV, limiting the method's utility in clinical screening and monitoring. Strain echocardiography and cardiac acoustic radiation force impulse (ARFI) imaging...
A method for measurement of the bladder wall nonlinear elasticity is presented. The method is based on acoustoelasticity modeling of the bladder tissue modulus of elasticity changes at different volumetric loading levels. At each loading volume, tissue strain is obtained from the real-time images. Using acoustic radiation force, a transient Lamb wave is excited on the bladder wall and shear elasticity...
The paper proposes an experimental methodology for measurement of forces acting on the rotor under special operational conditions. The influence of static eccentricity with different load applied on the rotor is investigated. The paper also describes all necessary motor construction modifications and the procedure of preliminary measuring system calibration.
The number of deaths caused by traffic accidents remains high, in spite of the development of many kinds of safety technologies. It is difficult to absorb the impact energy sufficiently in many cases. We suggested that the impact energy can be further absorbed by adjusting the deformation resistance of the material of the structure instantaneously. Furthermore, we developed an impact-reduction setup...
Phononic crystals have attracted intensive research interest for decades since the early 1990s. They exhibit a spatially periodic feature regarding the distribution of physical properties, geometry, boundary conditions, or/and external stimuli, making their wave spectrum quite different from the conventional continuous one, usually with frequency band gaps where waves cannot propagate through them...
In transversely isotropic (TI) materials, mechanical properties differ along versus across the axis of symmetry (AoS). The degree of these directional differences has been interrogated by ultrasound-based measures of shear wave velocity (SWV) and ARFI peak displacements (PD) acquired along versus across the AoS. When performed using a conventional linear array transducer, such measurements require...
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