In this paper, a simple field-oriented control (FOC) without direct quadrature (DQ) transformation is proposed for position tracking of permanent magnet stepper motors (PMSMs). Conventional FOC methods require DQ to linearize the mechanical dynamics PMSMs. proportional-integral-derivative controller with velocity feedforward developed obtain torque modulation required track desired position. addition, new commutation scheme generate currents modulation; equivalent microstepping where have...

The track needs to maintain sufficient foundation stiffness ensure its smoothness and meet the operation stability requirements of high-speed trains. However, train-induced deformation flexible suspension railway bridge will inevitably induce obvious vertical dynamic irregularity threaten train stability. Combined with a long-span main span 1092 m, this paper provides new analysis framework for evaluating on from perspective comprehensive train-track-bridge coupling vibration is conducted...

The electric motorcycles have drawn much attention in recent years because of their portability and high flexibility, which they became popular many countries. However, balancing these devices full-speed range, is a valuable research within the countries heading to an aging society, has not been thoroughly researched. In this paper, novel handlebar-free self-balancing motorcycle put forward cover deficiency. By controlling steering, can self balance by keeping its wheels swaying....

A passive vibration isolator with broad frequency field (zero dynamic stiffness system) is designed in this paper, whose mathematics model built applying a method. Then the static and analysis of conducted ADAMS software. The zero system developed based on theoretic study simulation analysis. Moreover, experimental validation modal acquired. experiment shows that natural has dropped from 11.715 Hz to 2.5421 because importing negative mechanism. result better reduction effect between 3 100 Hz.

This paper presents a method for walking assist control that uses an inertial measurement unit (IMU) sensor fixed to elderly person's foot estimate his or her motion. In the proposed approach, mobile device is synchronously driven by user's Furthermore, manipulator mounted on can support and help user walk. These functions make it possible move beside coordinate with steps. The validity of approach was confirmed through several experiments.

According to the needs in such fields as IC manufacturing and ultra-precision machining, a precision positioning system based on macro-micro dual-drive was developed. The macro is two dimensional high-speed large-scale linear motor drive. micro low speed PZT flexure hinge. systems are combined order achieve position. To advance of our research, we have done some experimental research system. experiment results show that can position at micron accuracy large workspace 300mm × under condition...

As the aging problem becomes increasingly significant, robots are being widely applied as walking-assist devices for elders or patients suffering from walking disabilities. In this paper, a novel multi-legged device that is fixed on waist, with two machine legs independent human legs, helps walk and climb stairs without any manipulation of machine. proposed device, an inertial measurement unit (IMU) sensor employed; IMU contains triaxial accelerometer, gyro (angular rate sensor),...

Replacing nurses and caregivers by human-friendly robots is drawing the attention of next generation for elderly people assistance those with special needs. However, human-machine cooperative control still a key challenge in this domain. This paper presents new approach walking assist that uses Inertial Measurement Units (IMUs) fixed on people's body to track their posture estimate its Center Of Mass (COM) Zero-Moment Point (ZMP) motions be used differential mobile robot synchronize user's...

This paper presents a type of NEMS (Nano-Electromechanical System) double Si3N4 resonant beams pressure sensor. The mathematical models are established in allusion to the and sensitive diaphragm. distribution state stress has been analyzed theoretically based on model diaphragm; from analysis result, position above diaphragm was optimized then dominance observed after adopted is illustrated. From optimized, illustrating advantages adoption beams. capability sensor generally using ANSYS...

Due to their good portability and flexibility, two-wheel electric motorcycles are popular in many countries nowadays. However, keeping the balanced, which is a valuable research an accelerating ageing society, has not been thoroughly researched. In this essay, novel self-balancing motorcycle put forward cover deficiency. By controlling steering, paper, balance of can be kept with its wheels swaying. Also, three different kinds structures steering were discussed. And master operator added for...

Lacking in adequate care for the elders, especially those who are walking with inconvenience is becoming a growing problem aging society. The elders walk inconvenience, once they fall down, it very dangerous. It also necessary to exercise order keep normal social life. Many kinds of aids have been developed, but most them fail avoid elders' falling down which an important issue aged care. So far, there few researches focusing on cooperation between human and legged robot. Inertial...

A two-dimensional ultra-precision positioning system with high-speed and large-range which can be used in a micro-nanometer machining has been studied this paper. The macro-micro dual-drive is to satisfy these requirements. Because of the strong nonlinearity piezoelectric devices, such as hysteresis creep, influence highly accelerated run macro-positioning stage, traditional PID control not provide good performance for system. According accuracy demands system, position controlling based on...

For the hot-embossing lithography, imprinting stamp with long-life span, good anti-wear property and precise geometrical shape, is much expected for pushing forward technology to industrial application. By analyzing disadvantages of current Si SiO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> stamps, this paper presents TiN coating/glass substrate system as material, in which glass plates serves hard coating fabricated nano-patterns....

According to the positioning accuracy requirements of two-dimensional precision system, a two dimensional intelligent control system is used in our study. The experiment also conducted. experimental result shows that and dynamic performance fuzzy neuron self-adaptive PID high-speed movement are better than traditional same stage. For random point on carrying board 250 mm by mm, can ensure repeated error this less 1 um within range 300 under design load.

According to the positioning accuracy requirements of two-dimensional precision system with high speed, wide platform, large range and linear motor driving, an intelligent control based on is studied in this paper. The experiment also conducted. experimental result shows that dynamic performance fuzzy neuron self-adaptive PID speed movement are better than traditional same stage. For a random point carrying board 250 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML"...

With the acceleration of China's industrialization process, energy crisis and environmental pollution are becoming more serious, which driving rapid development new industry diversification using methods. Electric vehicles with saving emission reduction characteristics have become an important solution to this problem. In view electric vehicle charging stations in future, paper establishes location selection lowest comprehensive cost whole society based on operation maintenance construction...

Since the two-wheel electric motorcycle has good portability and flexibility, it is popular in many countries nowadays. However, keeping motorcycles balanced, which a valuable research an accelerating ageing society, not been thoroughly researched. In this paper, novel self-balancing without handlebar put forward to cover deficiency. By controlling steering, balance of can be kept with its wheels swaying. And direction operated by human body. Also, three different steering phases handleless...

A type of NEMS double Si <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</inf> N xmlns:xlink="http://www.w3.org/1999/xlink">4</inf> resonant beams pressure sensor is presented in this paper. The maths models are established allusion to the and sensitive diaphragm. Based on model beams, relation between frequency key dimensions analyzed. diaphragm, distribution state stress analyzed theoretically, through analysis result, position where placed...

In order to measure the microcosmic profiles of ultra-smooth surfaces, a high-accuracy noncontact micro-Coordinate Measuring Machine (micro-Coordinate Machine, micro-CMM) is developed in this paper. The working table measurement device located by macro-micro dual-drive system. A closed-loop control system, which composed laser interferometer and stepper motors, adopted improve positioning accuracy macro-positioning stage. experimental results show that system obviously improved satisfies...

A two-dimensional ultra-precision positioning system with high-speed and large-range which can be used for micro-nanometer machining has been studied out in this paper. Macro micro moving are to meet the demands of large-range. According macro system, a valid control fuzzy-neuron self-adaptive weighted PID algorithm high speed precision is proposed. The experimental results show that error repeated accuracy less than 1 μ m random point within range 300mm by under design load carrying...

With the rapid development of modern social technology, AI technology has been applied to various places in people's lives. At present, track and field sports is developing rapidly under background AI. Although our country's competition level improved, there still a certain gap compared with world's leading level. Awareness physical exercise should be cultivated from an early age, education not neglected. cultural achievements are important, fitness training also keep up. This article...