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In this paper, the experimental research on the tool failure mechanism using YG6 and PCD tool cutting Particular Reinforced Metal Matrix Composites (PRMMCs) with ultrasonic cutting and common cutting was carried out, and it was discovered that: (1) the tool wear of ultrasonic cutting is less than that of common cutting, the cutting speed and feed speed have greater effect on tool wear and the cutting...
Based on the theory for small fields superposed on finite biasing fields, the finite element model of a high frequency, double-layer plate, thickness-shear vibration pressure sensor under biasing field is set up, and a biasing field finite element method (BFFEM) is proposed. Both ends of the piezoelectric plate, vibrating in thickness-shear mode, are subjected to bending moment and axial force, excited...
In the paper, collision mechanics is used to analyze the hitting process of the bats in the baseball games. The model is constructed in the paper to testify the sweet spot on a baseball bat. The vibration impulse on hands is analyzed. And the hitting point of the center of percussion with zero vibration impulse is obtained by quantitative calculation. Some reasons are given to explain why practical...
Low back pain was paid more attention, due to cause a decline in the quality of life and great economic costs. There are many risk factors for low back pain using manual material handing, such as poor postures, excessive force and vibration, manual material handing is a high incidence of low back pain industry. This study analyzed the gravity torque, erector spinae muscle strength as well as the extrusion...
Process plants like integrated steel plants use thousands of electric motors as prime movers of process equipment. The reliability of motors, especially large motors in the range of several hundreds of kilowatt capacity is vital as breakdown of these motors leads to breakdown of major facilities which these drive and cause large production losses. The maintenance of these large motors is often planned...
Electrical discharge machining (EDM) is widely used for manufacturing various kinds of dies and molds. While it can bring some disadvantages such as environmental pollution. EDM in gas is a new technology and based on which a new EDM method called ultrasonic vibration assisted EDM in gas medium is proposed in this paper. The principle of ultrasonic vibration assisted electrical discharge machining...
According to requirements for grading and characteristics, mathematical model of linear vibrating screen with the pursuit of minimum power consumption per productive is established. By means of MATLAB optimization technology, the best design is acquired. The results show that power consumption per productive obtained from optimization is decreased significantly compared with empirical design.
In this paper the necessity of strengthening transportation of fruit and vegetable is discussed systematically. And combined to the characteristic of fruit and vegetable, and the situation of cold storage transportation, storage and transportation relevant technique requirement of fruit and vegetables is analysed, such as temperature, humidity, gas composition, package and vibration, and according...
A cylindrical traveling wave ultrasonic motor using outer excitation of two bending transducers is proposed in this paper. To avoid the drawbacks of conventional traveling wave ultrasonic motors, sandwich structure of PZT elements and d33 mode of PZT are used here. Working principle and design analysis by means of FEM method are detailed. A prototype motor has been fabricated and tested. Although...
For automotive applications, the mechanical behaviour of the contact area under vibrations is one of the key factors for connector reliability. Such vibrations are typically in the range of 10-2000 Hz and result in displacements of only a few microns, at the contact interface. In the present study, a bench test has been developed to control more representative motions down to 1 μm. The objective is...
Vibration has serious effects on working condition of hydraulic gate. The vibration characteristics, such as natural frequencies, modal damping and modal shape, of a plane gate with violent vibration in the outlet of inverted siphon are obtained by experiment and analysis with hammer excitation method. The results show that the distribution of natural frequencies of the hydraulic gate in a wide range...
Because of the viscoelasticity of the cushion material and the complexity of the products, there are usually multiple vibration modals in the packaging system. The free acceleration response of the packaging system can be expressed as the linear combination of exponentials. To identify the zeros and residues accurately, a novel approach which incoporates the modified Prony method with structured nonlinear...
Using ANSYS, static analysis and dynamic analysis were made for a certain large-scale linear vibrating screen structure, weak links were found out in structural design. The improved schemes were proposed for vibrating screen structure. The static and dynamics analysis's results of each schemes were compared, the optimal improved scheme was obtained. It is shown that, in the vibrating screen structure,...
Based on the ANSYS software platforms, the structural vibration and noise of the truck cab structures have been systematically simulated and studied with test modal technology, the finite element and the boundary element methods in this text. First, modal analysis is made to obtain the structure's modal parameters. Then, the finite element modal is checked and verified by the test results. The dynamic...
A new shear wave velocity imaging technique to monitor radiofrequency and microwave ablation procedures is presented, coined electrode vibration elastography. A piezoelectric actuator is attached to the ablation needle and is transiently vibrated to generate shear waves that are tracked at high frame rates. The time-to-peak algorithm is used to reconstruct the shear wave velocity and thereby the shear...
As the electronic products become multi-functional and complicated, relatively high-density pattern must be designed to meet these requirements. As a result, multilayer printed circuit boards (PCBs) with high aspect ratio (AR>;13) through hole metallization become the main trend in fabrication. That is, how to metalize the PCBs by Copper deposit with high throwing power and reliability becomes...
Energy harvesting has the potential to save billions of dollars and create ground breaking technologies for sustainable ocean monitoring systems. Replacement of batteries from the sensors deployed on sea floor is expensive and tedious process. The cost of maintenance for battery operated equipments in the deep waters may be prohibitive. Thus, it is highly desirable to develop a system that harnesses...
This paper provides some design guidance to assist in addressing and controlling underwater noise of an offshore project-be it oil rig, wind turbine, tidal power or other structure floating on the water or bottom mounted. The importance of a Plan to address and abate noise in order to achieve an underwater-radiated noise goal will be highlighted. The Plan's elements usually include management, personnel,...
This paper presents an ergonomic vibrotactile feedback device for the human arm. Due to the developed concept, the device can be used for a large spectrum of applications and a wide range of arm diameters since vibration segments are self-aligning to their intended positions. Furthermore, the device improves user convenience and movement capability as it is battery powered and controlled through a...
The tri(o-phenylenediamine) cyclotriphosphazene (TPCTP) was synthesized using titrating technology of hexachlorocyclotriphosphazene solution and the synthesis parameters were investigated, and the structure of TPCTP was analyzed by FTIR in this paper. Using TPCTP synthesized in the work as flame retardant, the epoxy molding compound(EMC) for packaging of large-scale integrated circuits with halogen-free...
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