Configuration Design and Kinematics Analysis of Compound Power-Split Mechanism Using Structural Matrix Approach

Based on the feature requirements of mechanical product configuration design principle, this paper takes the passenger car product as an example to transform the nominal variable and numerical variable parameters of key component configuration design features into standard values, and extract the feature of functional requirements most concerned by customers from different customer orders as the feature of key component configuration design. From the perspective of demand, the principal component analysis method is used to analyze the customer order, and the configuration design characteristics of key parts of passenger car are determined according to the contribution degree of eigenvalue.

Spreadsheet-based interactive design and analysis of mechanisms using Excel and Ch

The use of grammars in mechanical design research is growing in popularity, largely due to the ability of a grammar to concisely express a language of designs. It is natural to attempt to achieve the level of success at writing descriptive languages for mechanical devices as is seen with spatial grammars in describing architectural styles. However, the differences in representing form and function between the fields and the mechanical designer’s focus on function must impact the type of grammars that can be used in describing mechanical designs. Two grammars for mechanical configuration design are briefly described: a string grammar for the design of cordless power drills and a graph grammar for the design of rolling carts. The ability of the grammars to generate a space of machine designs is discussed. How a mechanical design grammar can provide a platform for a designer assistance tool and the strengths and weaknesses of such a tool are presented.

Flexible energy storage devices with excellent mechanical deformation performance are highly required to improve the integration degree of flexible electronics. Unlike those of traditional power sources, the mechanical reliability of flexible energy storage devices, including electrical performance retention and deformation endurance, has received much attention. To provide the guideline for the construction design of devices, the strain distribution and failure modes in the entire architecture should be comprehensively investigated during mechanical deformation. This review mainly focuses on the mechanical deformation characterization, analysis, and structural design strategies used in recent flexible lithium‐ion batteries (LIBs) and supercapacitors (SCs). The primary theoretical calculation of bending strain in the devices is introduced first, and then several parameters to describe the bending status are summarized. Among those parameters, bending radius and its corresponding test methods and equipment are highlighted. Derivative strategies for structural design and an overview of their application progresses, such as selection of substrates, thickness of devices, employment of encapsulation, and novel architectural designs, are reviewed in detail. Finally, the challenges and prospects of flexible energy storage devices with reliable mechanical performance are discussed.

Problems about mechanical design and kinemetic analysis are researched. The research proposes a detailed algorithm about mechanical design and tests the algorithm through data which is collected via experiments. This paper also calculates the working space of robot through those data and simulates the working space via soft Matlab. The results of the simulation are the same as the pratical working results. The conclusion of this paper is significant to the thoretical research and engineer exploitation of industrical robot.

The authors have developed a general-purpose simulation system for the design of link mechanisms. Topological and Kinematic analyses have already been referred to in the preceding paper. In this paper, methods for the dynamic analysis of link mechanisms with controllers, such as transient response and vibration analysis, are proposed. Both the characteristics of the control system and the equations of motion of the mechanical system are automatically and simultaneously transformed into nonlinear state equations. In transient response analysis, for example, the responses of joint displacements, etc., are calculated by the numerical integration of these equations. In vibration analysis, the state equations are linearized around the desired trajectory to calculate the eigenfrequency, mode shape, and transfer functions. The proposed methods were applied to an industrial fobot, and the effectiveness of the methods was ascertained.

Expert tutoring system for teaching mechanical engineering

A characteristic feature of technological machines used in the fashion industry is the complexity of motion of the working links, both in terms of geometry and motion laws. Such technological motions are provided by complex mechanisms, the basis of which consists of structural groups of third-class and higher-class links. In multi-link structural groups of higher classes, complex motions of certain points along trajectories resembling planar linkage curves of various geometric shapes are observed. If the centers of external kinematic pairs of another structural group, which is attached to the previous group of links, are placed at such points, theoretically, any trajectory of the working point of the machine with the necessary motion laws required for performing a technological operation can be obtained. In practical application, the use of higher-class structural groups within the kinematic scheme of a planar mechanism leads to complexities in its further investigation. This is explained by the necessity of conducting studies using specially developed methods for their implementation. In cases where these methods cannot be applied, there arises the need for individual development of a sequence for conducting such studies in each specific case of such complex mechanisms, taking into account their structural characteristics. A sequence of actions has been developed and a kinematic analysis of an eight-link third-class mechanism has been conducted using a graph-analytical method. Acceleration plan has been graphically constructed, and the magnitudes and directions of angular accelerations of the mechanism’s links have been calculated. The selection of a conditionally different possible initial mechanism allowed transforming the eight-link third-class mechanism with two sequentially attached structural groups of links into a mechanism with sequentially-parallel attachment of second-order second-class link groups and performing the analysis of the third-class mechanism in a manner characteristic of the analysis of second-class mechanisms. The proposed method of analyzing higher-class mechanisms may be useful for conducting similar studies.Keywords: research of mechanism, analysis of mechanism, kinematic investigation, kinematic analysis, angular acceleration, linear acceleration vector, acceleration plan

A quadcopter is an Unmanned Aerial Vehicle (UAV) with 4 propellers providing required force for motion. It has four equally spaced rotors, typically arranged at the corners of a central body. With four independent rotors, the need for a swashplate mechanism like that in a regular helicopter is alleviated. Due to the rotation of the propellers attached to a quadcopter an upward thrust is generated. The maneuverability of a quadcopter is primarily controlled by adjusting the speed of each propeller attached to a rotor which in turn creates different lifting forces for maneuvering. The objective of this work is to design a 2-axes rotation mechanism for a shaft while its propeller rotates about its own (the 3rd) axis in a 1 m by 1 m quadcopter. Besides the spinning of a propeller axis, two other perpendicular axes in the mechanism are capable of pivoting in a flight which dynamically modifies the thrust vector direction and enhances the quadcopter’s maneuverability. The project was accomplished by performing several key tasks involving mechanism design using bevel gears, shafts, and motors, computational fluid dynamics analysis to determine aerodynamic thrusts and airflow pattern, rigid body dynamics analysis to evaluate forces and torques at different sections of the mechanism, and finite element analysis of mechanical components to optimize the stresses and fatigue as well as their corresponding safety factors. The final mechanism design provides mobility similar to a spherical joint capable of pivoting from −45 degrees to 45 degrees about 2 orthogonal axes for a small size drone. The results of rigid body dynamics analyses for a small size drone indicate that the minimum required motor torque is about 0.5 N-m, based on using a 40-mm driving nylon gear with gear ratio of 1:2 and an aluminum shaft with its propeller rotating at 2000 rad/sec, the nylon gear is good for 5 million cycles, the ABS plastic fixture is good for 10 million cycles and the shaft was designed for 1 billion cycles of fatigue life. Further study would be required in developing the control system for this quadcopter design and optimizing the entire structure of the drone, prototype verification of the mechanism design on flight maneuverability is also recommended. A parallel study using the layered composite design is currently undertaken. A comparison between metal and fiber composite shafts on weight reduction and performance of the mechanism would be revealed in our next paper.

The purpose of this paper is to present the mechanical design and analysis of pneumatic ankle foot orthosis (PAFO) device which can be used for assisting and rehabilitation of ankle foot that has impairments. Some of these impairments are cerebral palsy, multiple sclerosis and muscular dystrophies. The PAFO assists the ankle during dorsiflexion and plantar flexion by way of pneumatic artificial muscle and pneumatic rotary actuator. The designed PAFO is also equipped with various sensors such as force, position and accelerometer. The lightweight and portable design that based on biomechanical studies is built with carbon fiber material. The mechanical design is done in SolidWorks. The PAFO that design has been analyzed using Matlab/SimMechanics to determine the ankle joint torque requirement during gait. The results of the analysis have showed the biomechanical suitability of PAFO device. © 2018 IEEE.

Operating principle and motion characteristics of an eccentric crank slide-block mechanism are analyzed. A virtual prototype model of the eccentric crank slide-block mechanism is set up based on ADAMS,a simulation software. The kinematics analysis of the eccentric crank slide-block mechanism,it is given.Under the premise of meeting the requirements of slide stroke and travel velocity-ratio coefficient, based on ADAMS, each component size of the eccentric crank slide-block mechanism with best pressure angle (α max ) min can be easily obtained. The equations and the calculations can be used in engineering practice.

The reactor system (including related systems) is an important part of the marine nuclear power plant and the power source of the ship, and also called the nuclear power plants in engineering. The reactor system shall not only meet the relevant functional requirements, but also be able to withstand the loads generated during its operation, such as temperature, pressure, environmental loads, tilt and swing caused by storm, accident loads and shock blasts generated by non-contact bomb explosions. The task of mechanical analysis and evaluation, i.e. mechanical design, is to ensure that the mechanical behaviors of the reactor system under the above-mentioned load conditions satisfy requirements specified in related regulations. The mechanical design mainly includes three aspects: design inputs, analysis methods and evaluation criteria. The design inputs are used to define the load conditions to be withstood by the reactor system, the analysis methods are used to predict the mechanical behaviors of the reactor system under various load conditions, and the evaluation criteria are used to determine the acceptability of the mechanical behavior occurred in the reactor system under various load conditions.

The engineering design is a very comprehensive term and required a number of different disciplines work together. There are many examples of engineering design studies and design of mechanisms is one of them. The design of mechanisms is one of the focused areas by mechanical engineering field and it includes kinematic synthesis, kinematic analysis, kinetics, dynamics, force and optimization of the mechanisms. The mechanisms can be complex; hence, additional help is needed in solution process. At that point, artificial intelligence (AI) of computer science is a really helpful for the mechanical engineers. Artificial intelligence field was found in 1956 and it is applicable to significant parts of the mechanism design. However, mechanical engineers cannot really apply artificial intelligence principles to mechanism design and as a result, design of mechanisms via AI became an interdisciplinary engineering studies between mechanical engineering and computer engineering. In this chapter of the book, mechanism design with artificial intelligence is focused and some sample applications are shown.

The purpose of this study is to design and analysis of a parallel kinematic mechanism based on Abbe’s principle can be applied to the 3D-coordinate measuring machine. In this study is the design and analysis of the parallel kinematic mechanism, which includes the mechanism design of linear drive rod mechanism and displacement sensing position coaxial, and the intersection of the three linear drive rod mechanisms are located at the contact probe. Therefore, the design of this study improves the displacement of the linear drive rod and Abbe error resulted from the angle variation of the displacement sensor. Furthermore, the mechanism performance has been verified experimentally. Through precision tests of the machine by a laser Doppler interferometer, the linear drive rod mechanism positioning precisions are within 1μm.

A general methodology for modeling and analysis of a single leg walking mechanism of quadruped robot is presented in this paper to solve the problems of more drive elements, more complex structure and control system in existing single-leg walking mechanism. The principle scheme and scale optimization design of proposed walking mechanism are completed according to the requirements of the foot end trajectory curve and Grashof’s criterion. The models of kinematics and dynamics of presented mechanism have been built. By numerical calculation, the variations of displacement, the angular velocity and moment of the equivalent crank are discussed. The results indicate that the kinematic and dynamic properties of the optimized mechanism are better than those before optimization. Furthermore, these results provide a basis for the structural design of a single leg walking mechanism of quadruped robot.