Kinetic Analysis of TBM Gripper and Thrust Regripping System in Hydraulic-Mechanical Coupling Based on Power Bond Graph

TBM is important equipment in mining and road construction, and the kinetic analysis of TBM gripper and thrust regripping system in hydraulic-mechanical coupling plays a vital role in practical applications. This paper describes the three motion states of TBM gripper and thrust regripping system and how the hydraulic-mechanical coupling device works. AHP (Analytical hierarchy process) is applied to assess the kinetic analysis of TBM gripper and thrust regripping system in hydraulic-mechanical coupling based on power bond graph under different motion states from the perspective of the expression accuracy of physical parameters, internal connection and consistency of transformation rules. The results show that TBM gripper and thrust regripping system displays the best results in the axial movement when power bond graph is used for hydraulic-mechanical coupling analysis.

Constant Cutting Force Control for CNC Machining Using Dynamic Characteristic-Based Fuzzy Controller

This paper presents a dynamic characteristic-based fuzzy adaptive control algorithm (DCbFACA) to avoid the influence of cutting force changing rapidly on the machining stability and precision. The cutting force is indirectly obtained in real time by monitoring and extraction of the motorized spindle current, the feed speed is fuzzy adjusted online, and the current was used as a feedback to control cutting force and maintain the machining process stable. Different from the traditional fuzzy control methods using the experience-based control rules, and according to the complex nonlinear characteristics of CNC machining, the power bond graph method is implemented to describe the dynamic characteristics of process, and then the appropriate variation relations are achieved between current and feed speed, and the control rules are optimized and established based on it. The numerical results indicated that DCbFACA can make the CNC machining process more stable and improve the machining precision.

Nonlinear Coupling Characteristics Analysis of Integrated System of Electromagnetic Brake and Frictional Brake of Car

Since theoretical guidance is lacking in the design and control of the integrated system of electromagnetic brake and frictional brake, this paper aims to solve this problem and explores the nonlinear coupling characteristics and dynamic characteristics of the integrated system of electromagnetic brake and frictional brake. This paper uses the power bond graph method to establish nonlinear coupling mathematical model of the integrated system of electromagnetic brake and frictional brake and conducts the contrastive analysis on the dynamic characteristics based on this mathematical model. Meanwhile, the accuracy of the nonlinear coupling mathematical model proposed above is verified on the hardware in the loop simulation platform, and nonlinear coupling characteristics of the integrated system are also analyzed through experiments.

Dynamic Characteristics Investigation on Hydraulic System of Power-Slipway for Combined Machine Tools

The power bond graph of hydraulic system of power-slipway for combined machine tools was built on the basis of analysis on its hydraulic system and actual working cases. Dynamic model of hydraulic system of power-slipway was built. At the same time, making use of Simulink, dynamic simulation of hydraulic system of power-slipway was carried out. Influence law of primary technology parameters on dynamic characteristics of the hydraulic system of power-slipway was expounded. The simulation results will provide theory basis for performance analysis and optimal design of hydraulic system of power-slipway for combined machine tools.

Dynamic Analysis and Design Optimization of Series Hydraulic Hybrid System through Power Bond Graph Approach

The availability of natural gas and crude oil resources has been declining over the years. In automobile sector, the consumption of crude oil is 63% of total crude oil production in the world. Hence, automobile industries are placing more emphasis on energy efficient hydraulic hybrid systems, which can replace their conventional transmission systems. Series hydraulic hybrid system (SHHS) is a multidomain mechatronics system with two distinct power sources that includes prime mover and hydropneumatic accumulator. It replaces the conventional transmission system to drive the vehicle. The sizing of the subsystems in SHHS plays a major role in improving the energy efficiency of the vehicle. In this paper, a power bond graph approach is used to model the dynamics of the SHHS. The obtained simulation results indicate the energy flow during various modes of operations. It also includes the dynamic response of hydropneumatic accumulator, prime mover, and system output speed. Further, design optimization of the system is carried out to optimize the process parameters for maximizing the system energy efficiency. This leads to increase in fuel economy and environmentally friendly vehicle.

Dynamic Analysis of Cartridge Style Pilot Relief Valves

The cartridge style pilot relief valve is widely used in construction machinery field owning to its compact structure. The damping orifice is variable, which improves the stability and impact resistance. What more, the valve can realize filling oil. This article tells the principle of the valve, and analyses its dynamic performance by power bond graph method and AMESim software, which concludes how the parameters impact on its dynamic performance, such as the main valve spool damping coefficient, damping orifice diameter, the pilot spring stiffness and so on.

Dynamic Characteristics Investigation on Hydraulic System of Array Nail Machine Based on Simulink

The power bond graph of hydraulic array nail machine was built on the basis of analyses on its hydraulic system and actual working cases. Dynamic model of array nail machine hydraulic system was built. At the same time, making use of Simulink, dynamic simulation of hydraulic system of array nail machine was carried out. Influence law of primary technology parameters on dynamic characteristics of the hydraulic system was expounded. The simulation results will provide theory bases for performance analysis and optimal design of array nail machine hydraulic system.