In this contribution, we propose a novel linear piezoelectric motor with compact stator that is driven by single mode. The can realize bidirectional motion changing the vibration modes of stator. Finite element analysis performed to determine required mode and obtain optimal structure dimensions. Furthermore, trajectories driving foot are analyzed without consideration mechanical contact slider. It shown trajectory an oblique line when disregarding contact, becomes ellipse while taking into...

In this study, a large thrust linear ultrasonic motor using an L-shaped stator is described. The constructed by two mutually perpendicular rectangular plate vibrators, one of which mounted in parallel with the slider to make structure be more compact. symmetric and antisymmetric modes based on first order bending vibration vibrators are adopted, each resonance mode assigned drive direction. placement piezoelectric ceramics could determined finite element analysis, influence slots head block...

The plasma sparker has been applied in oceanic high-resolution seismic exploration for decades. Normally it is towed on the water surface. This suitable shallow water, but if depth great, resolution will decrease dramatically, especially horizontal direction. paper proposes concept of a deep-towed and presents an experimental study performance terms electric parameters, bubble behavior, acoustic characteristics. results show that hydrostatic pressure at source ranging from 1 to 2000 m...

The applications of acoustic emission (AE) technique in detection valves are presented this review, and the theoretical models experimental results nondestructive using AE provided. generation signals basic composition system briefly explained. focused on condition monitoring, failure, cavitation detection, development portable measuring devices. All prove that works well valves.

In this paper, a novel rectangular structure linear piezoelectric actuator that utilizes two lower order decoupled vibration modes is developed and investigated. A noticeable trait of the it can realize bi-directional motion by changing mode stator with different exciting frequencies. Modal harmonic analysis are performed finite element method to determine dimensions stablished driving tip trajectories diagonal lines. The direction controlled orientation generated at tip. When inclined right...

A simple model was built to predict the national and regional electricity demand by sectors under China’s new normal situation. In model, data dimensionality reduction method Grey (GM(1,1)) were combined adopted disaggregate economic growth rate into levels forecast each region’s contribution industrial structure. Then, a bottom–up accounting that considered impacts of structure transformation, energy efficiency, household electric consumption demand. Based on predicted values, this paper...

In order to meet the demand of a linear ultrasonic motor with large thrust in narrow space, novel Π-type double driving feet is proposed. this paper, structure stator designed. The working mode and size are determined by finite element simulation. To amplify amplitude foot, an optimization design for performed. After that, pre-load device that separates from put forward, which can not only improve output but also help operation stability prolong life motor. Additionally, prototype proposed...

A point contact model is developed to analyze the fundamental characteristics of a single-mode actuation type linear piezoelectric actuator in this paper. The prototype plate using two-phase excitation, which realizes bi-directional motion by changing vibration mode within different exciting frequencies. Differs from other models, barycenter stator taken into account, and trajectories driving tip are simulated measured with without consideration mechanical contact. results show that spiral...

Abstract A novel bolted-type piezoelectric actuator excited by two excitation methods was proposed and investigated in this paper using both simulations experiments. Different from most existing actuators, the can be different methods, namely single-phase method dual-phase method. The structure of depicted its geometric dimensions were presented. Furthermore, working principles under these illustrated detail, vibration characteristics driving foot analyzed finite element In addition, a...

It is a challenging task for an aerial manipulator to complete dual-arm cooperative manipulation in outdoor environment. In this study, new system with flexible operation developed. The designed the application of manipulation, and it has characteristics low weight, inertia, humanoid arm structure. structure composed customized aluminum parts, each contains four degrees freedom, similar arrangement human joints, including shoulder yaw, pitch, elbow wrist roll. Next, workspace simulated...

In 2009, the capacity utilization and profit margin were 76% 2.43% respectably in steel industry. The is lower caused by utilization. Balance between production sale one key means to develop industry healthily improve margin. Different from other data analysis models, MSAD use historical of predict output specified period. It prefers development corresponding demand trends, "Effective Demand" future. Based on theory MSAD, Demand Created Consumer", 2015, there are 739.86 million tons 740.95...

The design of a novel composite adaptive control system for class uncertain systems using immersion and invariance (I&I) theory is presented. interest here to achieve I&I in the presence model parametric uncertainties. Two sources parameter information are combined adaptation, which consists tracking-error based adaptation law prediction-error law. Particularly, constructed theory, leads more flexible effective process Stability analysis presented Lyapunov theory. Representative simulations...

Abstract: Renewable energy planning will consider and weigh the technical, economic, social, environmental other factors comprehensively, these tend to use many types of standard measure, metrics often conflict with each other, which bring difficult renewable planning. Based on program selection feature, a multi-criteria decision-making model based VIKOR was built resolve problems, so that achieve optimal choice And applied for decision making in one province China.

Linear ultrasonic motors can output large thrust stably in a narrow space. In this paper, plate linear motor is studied. Firstly, the configuration and operating principle of Π-type illustrated. Then, two slotting schemes are put forward for stator to enlarge amplitude driving foot improve performance motor. After that, novel optimization method based on power flow suggested describe energy stator, so as estimate schemes. Finally, prototypes manufactured tested. The experimental results show...