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This paper presents an integrated articulated steering vehicle's (ASV) dynamics model, which provides a simulation platform for research on path tracking control of ASV. The active speed limiting control is designed according to the sideslip constraints to improve the lateral stability of the vehicle during path tracking. The weighted PID controller is applied to control the steering torque based...
The paper presents the failure mode of high-power light emitting diodes (LEDs) under mechanical pressure and verifies the bonding wire as the weakest structure of LEDs. Different lens radiuses and heights are studied to demonstrate the influence of lens parameters on the mechanical strength of LEDs. The experimental results have demonstrated that a LED device has a higher failure force when the lens...
Friction modeling plays a very important role in control and simulation systems. A lot of dynamic models are proposed to capture most of the friction behavior observed experimentally. Most dynamic models are typically considered to be dependent only on relative speed and relative displacement of contacting surfaces. However, it is known that dynamic characteristics of friction are affected by other...
For the rolling system, it should be a multi-variable, strong disturbance and coupled nonlinear system. As the precondition of ensuring the precision of strip thickness, it is necessary to ensure that the system is robust. The controller should be able to suppress the disturbance of the system and remain the system stable under the uncertain parameters. Taking into account the complexity of the system,...
Wet steam is a common two-phase flow whose mass flow-rate can be measured by V-Cone flowmeter. The mass flow coefficient CD of V-Cone is no longer approximately constant which affects the measuring accuracy subject to the complex flow characteristics of wet steam and discrete droplets. Firstly, five main impact factors for CD of V-Cone were obtained by dimensional analysis, namely, vapor Reynolds...
There is a lack of system-level finite element (FE) model which can directly predict the performance of a piezoelectric energy harvester connected with interface circuits and electric load. This work developed a system-level model of piezoelectric strain energy harvesting system by directly coupling the finite element and electrical circuits. The strain energy harvester (SEH) is a macro fibber composite...
Gas insulated switchgear (GIS) is widely used for its good economic benefits. But mechanical faults caused by electromagnetic force occur occasionally. The conducting wire and the metal shell are exposed in the alternating electromagnetic field, which is caused by the load current and vortex. This leads to electromagnetic force because of electromagnetic induction. So it is necessary to analyze the...
Orthodontic force simulation is very important for the guidance of clinical orthodontic treatment. Previous works were mainly conducted by directly loading the force on a single or a few teeth. However, in clinic, the orthodontic force is provided by loading orthodontic appliances, and there currently is no appropriate way to measure the force on the teeth provided by the loaded appliances. This study...
Due to the existence of clearances, contact-impact events are liable to cause lower transmission precision and slower dynamic response of the mechanism involving revolute joints. Based on the elastic-damping method, the continuous contact force (CCF) model is widely used in explicating the contact-impact phenomena. As part of storing and releasing strain energy in the CCF model, the elastic force...
The use of minimally invasive procedures for breast tumor diagnosis and treatment, such as needle biopsy and radio frequency ablation (RFA), is steadily increasing. Accurate needle insertion requires solving the problems of tissue deformation and target displacement. Breast needle insertion guided by imaging techniques such as ultrasound is widely used to evaluate suspicious masses within the breast...
Precision centrifuge is an important test equipment in inertial navigation. In this paper, the problem of the accuracy of 2-DOF precision centrifuge is investigated and the unbalance balancing problem is completed while the precision centrifuge rotor unbalance exists. Firstly, based on the institutional arrangements of precision balancing centrifuge system, the existing forms of the unbalance of the...
Reliable and stable insertion force is usually of utmost significant characteristic in a system which contains thousands of electrical connectors. Even if an electrical connector fails, it will lead to the whole system collapses. This paper established an insertion force model of a kind of electrical connector based on simply supported beam mechanical calculation theory. Experiment and simulation...
This paper deals with coordination control of a 3 DOF lifting system with human power amplification, taking passivity control into account to ensure safety interactions between human and object. A scissor mechanism based lifting system is designed to achieve compactness while an accumulator-pump/motor-cylinder architecture is employed to save electric energy from DC motor and recover potential energy...
Due to the stiffness and damping controllability of magnetorheological elastomer under external magnetic field, it has attracted great attention in the field of vibration control. In order to realize the vibration control system, accurate modeling of magnetorheological elastomer isolator is necessary. However, for the highly nonlinearity and inherently hysteresis of isolator, the existing parametric...
The dynamic response of large space structures under accidental impact has been the subject of intense research since the occurrence of the 9/11 incident. In the present paper, events of aircraft impact to the single-layer kiewitt-8 reticulated dome were simulated by using the 3D ANSYS/LS-DYNA. Impact loadings were carried out respectively by the Riera force history method and by modeling a real plane...
Cartridge flow valves, widely applied in heavy machine and equipment, have the advantages of low leakage, large flow capacity, and simple structure. However, in the existence technologies, in order to reduce the influence of load variety on valve flow, a pressure differential compensator or a cartridge type flow sensor should be added to proportional throttle valve. This method reduces valve flow...
The thrust system of TBM propels the cutter head boiling forward and the strong impulse loads on propelling cylinder cause serious vibration problems. Based on the typical thrust system which the thrust cylinders are controlled by pressure reducing valves, the paper obtained the dynamic velocity stiffness, static velocity stiffness, minimum velocity stiffness of the thrust cylinder. According to the...
A method is proposed for the resonant suppression of a flexible system based on vibration signal feedback. In addition to a torque, speed and position feedback control structure, this method filters some specific vibration frequencies of the output and then feedback them to the input of the system. Thus it is featured by a concise control structure and simple parameter design procedures. The paper...
Corrugated steel web bridge has been incorporated as a new kind of bridge structure recently in China. The single cell and single box section is regularly adopted, while the multi-cells and single box section is not, and its cross section shear force distribution rules are not yet clear. This paper presents research findings on corrugated steel webs shear force distribution of three-box single cross...
That recent years in China found a spate of 6 accidents of bridge collapse due to failure of suspenders arouses reflection of the industry. But the existing suspender models in researches are either too simple and rough or too complicated and inefficient. This paper therefore presents a support spring model based on a real bridge. The model is then applied to an actual bridge to analyze the impact...
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