The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
A novel electromagnetic clutch system is proposed to resolve the mechanical and electromagnetic impacts in the in-wheel motor drive electric vehicles. The dynamic analysis of the system is presented for researching the engagement process. Based on the dynamic analysis, the relationship between the action forces in the engagement is studied and the range of clutch's angular deflection is given for...
This paper presents a design and stability analysis of a crawler-type pipeline robot which has the radial adjustment ability and can adapt to the changing of pipe diameter, therefore the environment adaptability of the robot is improved. To analysis the motion stability of the robot, the posture model of the robot that works in different pipes, including elbow and straight pipe are established, some...
A kind of tracked pipeline robot with three-axis driving structures and radially adjustable characteristic is designed. The structure and the working principle of robot are introduced, the mechanical model of adjustable mechanism and its obstacle states are established, the mechanical properties of adjustable mechanism are analyzed, the relationship between traveling-capability and obstacle-climbing...
When one winding of the single-winding bearingless switched reluctance motor (SWBSRM) is short-circuited, a continuous radial force for the levitation can be obtained by extending the conduction of the prior energized phase. Based on the force compensation strategy, this paper aims to further improve the fault-tolerant ability of the motor. Optimized fault-tolerant current mathematical model is proposed...
A rotary engine with rectangle pistons and cylinders is claimed to have higher mechanism efficiency for eliminating the lateral force between piston skirt and liner. Constrained by the present machining and assembly accuracy, surfaces of piston could not fit the internal surface of cylinder well which might lead to gas leakage from cylinder. A novel ring used to seal rectangular cylinder was invented,...
Energy efficiency (EE) is an important factor for the deployment of wireless sensor networks. Cooperative communication can help to reduce energy consumption for long distance data transmission. This paper mainly presents the joint optimization of node selection and power allocation for cooperative communication in wireless sensor networks. The proposed brute force approach based on optimal power...
Ferromagnetic materials affect magnetic field distribution and force output of electromagnetic motors significantly. This paper studies effect of back iron on tubular linear motors with dual Halbach array. The structure and operating principle of linear motors with dual Halbach array are presented. Numerical method in Ansoft environment is employed to compute the magnetic field and force output of...
A novel dual Halbach array is proposed in this paper to increase the output performance of tubular linear machines. The magnetic field distribution in three-dimensional (3D) space is formulated with Bessel functions analytically. Following that, the modeling of force output for linear machines with three-phase windings is carried out based on Lorentz force law. The formula component of force ripple...
This paper presents a novel ant-based clustering algorithm. Different from conventional ant-based clustering algorithms in which the objects are picked up or dropped down by virtual ants, our propose algorithm looks each object as an ant. The objects are first projected to a plane randomly. Then an attractive force field is created. The object (ant) is attracted by the similar ones in its local surrounding...
This paper has analyzed the reasons for unbalanced magnetic pull (UMP) in some types of high power-density PM synchronous motors by theoretical model. In the following research, it is shown that UMP has close relationship with arrangement of stator windings and harmonics in winding functions. In order to validate the theoretical results, some types of FEA models with similar slot/pole combination...
A fabrication method of ultra-sensitive cantilevers with high yield of almost 100% is presented. The oxide layer of an SOI wafer is patterned before the bulk silicon etching. It would break at the patterned place, while the bulk etching was to the end, which could avoid the cantilevers breaking. The SOI wafer is putted in a PTFE container during etching and cleaning. We moved the container from liquid...
Based on the planning via model checking paradigm, we address the problem of coalitional planning in this paper. Informally, coalitional planning is the problem of planning for a subset of agents in a multi-agent system to force the whole multi-agent system to satisfy some goals. We use the language of ATL as the goal language and the semantic structure of ATL, i.e., concurrent game structure, to...
This paper presents a teleoperation system to control mobile robot remotely. A joystick controller with force feedback is used to control the mobile robot. The stability of the system is analysis in the rigid environment and freedom motion situation. A wireless serial communication card is designed for the robot and the controller. Finally the effectiveness of the teleoperation system is illustrated...
The model of speed ratio and clamping force upon driving and driven belt wheel in continuously variable transmission (CVT) system is built in this paper, which is based on the structure of CVT and electro-hydraulic control scheme; according to the method of single-pressure hydraulic control circuit, the relationship between the pressure of driving and driven cylinder and the speed ratio of CVT when...
Finding new under bump materials (UBM) is of significant importance with the shrinkage of pitch size in advanced high density packaging. FeNi alloy has been found to be a good UBM candidate for its slower interfacial reaction during reflow and aging. However, solderability of FeNi has to be improved. 58Fe42Ni and 92Fe8Ni alloy platings with electrodeposited tin finish were investigated by wetting...
In view of the structural features of wheel loader, the conditions for maintaining longitudinal and latitudinal stability in case of alignment and those in case of turning. The anti-roll monitoring and early warning plan is proposed based on the mechanical model when the load is rolling. And embedded technology is used in development of software and hardware platform of the early warning system, which...
Base on the launch mechanism and structure characteristic of rarefaction wave gun, interior ballistic gas dynamic model of it applying the inertial breech that considering the dynamic opening process of went equipment is established. By calculating the model the distribution of interior ballistic parameters in the launch process are also discussed, and then by contrasting the distribution of press,...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.