Guang Cheng

Study on work improvement in a packaging machine manufacturing company

This paper studies the improvement of production efficiency and balance rate of the manual assembly line in a packaging machine manufacturing company. MODular Arrangement of Predetermined Time Standards (MODAPTS) method is used to obtain time values for elements and for entire operations of the manual assembly line. Also the ECRS four principles (Eliminate, Combine, Rearrange and Simple) are used to minimize the idle time at every station or the percentage of line balance loss. In order to verify the results that were obtained from the generated line-balancing pre- and post-, Witness simulation software is used to estimate the output. Simulation results showed that productivity increases about 41.72% higher than the current situation.

The research of modeling & simulation on improving efficiency for job shop in manufacturing enterprise

This paper aimed at the cylinder head processing production line of a small equipment manufacturing enterprise, established the discrete digital simulation model of production and analyze the existing bottlenecks in the production line through the simulation run. This study raises the corresponding optimal adjusting program in accordance with the need of workshop production, carries out the comparative analysis of the facts before and after the workshop production, determines a standard method of production and the process, and then achieves to improve the production efficiency at the workshop working level, through investigating and analyzing over the line, this paper showed some measures about improving efficiency using Petri net and witness software with actual conditions. Then construe the results about theoretic and figures. These methods improved the efficiency of enterprise after the enterprise using them.

Experimental Study on Comfort Ranges of Manual Operation in Standing Position

The experimental study was conducted to assess the comfort ranges for manual operation in standing position. Twenty healthy young people (10 males and 10 females) were recruited as study subjects. With the example of an index finger push-button operation, the acceptable height ranges (approximately 800–1200 mm) of manual operation in standing position were determined by the experiment. Specifically, the five experimental heights from 800 mm to 1200 mm were set up with the step interval being 100 mm. In the operating plane (workstation), the 50 mm vertical and horizontal spacing buttons were arranged, respectively. The acceptable operating regions of the test height table can be obtained through statistical analysis of the forefinger push-button operations of all study subjects. Thus, the corresponding comfort ranges of manual operation on other experimental height planes can be replicated. The study results yielded certain practical values of mounting position for manual devices in the ergonomic design and assessment.

Experimental Research of Range of Motion About Wrist Joint

Objective: To investigate the range of motion (ROM) of wrist joint in human body, and the difference about ROMs between man and woman in subgroups and how it relates to age itself;

Experimental Study on Discrimination Thresholds for Haptic Perception of Size in Manual Operation

Objective: This experimental study was designed to measure discrimination thresholds for haptic perception of size in manual operation. Methods: Common manual operation modes with finger pressing or pulling, three finger pinch or grip, and hand grip were used in this study. Taking the index finger pressing operation as an example, the distal phalanx finger length and the width of the index finger were measured in order to determine the size range of sample buttons. The assessment procedure along with the measurement data sheet of index finger regarding pressing operation was designed. Study subjects were recruited and discrimination thresholds for the size haptic perception of the index finger were measured and analyzed.

Experimental Research for Motion Ranges of Knee Joints

To investigate the range of motion (ROM) of knee joints in the human body, the difference of ROMs between man and woman in subgroups, and how the difference of ROMs relates to age itself; One hundred healthy volunteers of ages 18–60 were recruited to complete the study. They were divided into two groups, with half of them male. The VICON motion capture system was used to measure ROMs of knee joint. The average value of knee joint ROMs for two groups was calculated. The changes in the ROM for two groups were compared along with the differences in the ROM between male and female, and between the left and right knee joints. ROMs of knee joints decreased as the age increased. The difference between the ROMs in the two groups was not significant. Female ROMs of knee joints were bigger than the male in the same age group.

Comfort Posture and Position of Push-Pull Operation of the Sagittal Plane in Standing

Push-pull operation is often used in daily work and life. The position of the operating lever, the grab bar, handrail, and the buckle slot is one of the main factors that affect the push-pull task performance. Through the test analysis of 30 people’s push and pull task, the comfort movement ranges of the elbow joint and the shoulder joint, as well as the acceptable height ranges of hand in the sagittal plane were obtained. The research results demonstrated some practical applications for the comfort evaluation of single light load push-pull operation and the ergonomics evaluation of the general manual control layout and position.

Experimental Study on Grip Ergonomics of Manual Handling

Improper design for the grip structure will lead to inefficient operation or work injuries. The study purpose was to simulate the shape, size, and position of a gripping structure by using a 30 kg rectangular box as a heavy object, to enhance the health and comfort for an operator. Ergonomic evaluation experiments for grip structural factors were performed by samples testing and virtual simulation methods for operational tasks. Research methods and results in this study have some reference meanings and guidance for the man-machine adaptation design regarding the shape, size, and location of manual handling gripping structure of products, supplies and equipment.

Simulation of an Astronaut’s Connecting Bolt Action in Orbit

This study primarily focuses on the simulation of an astronaut connecting bolt action in orbit. The upper limb model was established, which included three segments of upper arm, forearm, and hand, as well as three revolute joints of shoulder, elbow, and wrist. Joint kinematical parameters during one period were obtained by using the numerical solution of reverse kinematical equation. The corresponding virtual upper limb model was established and simulated using LifeMOD software. Thus, the simulation results can be validated by comparing the simulation trajectories of the mass center of hands with that of hands’ known motion. Additionally, the joints’ strengths can be compared when hands move in different directions of the human body coordinate system. The results are useful to astronaut’s orbital mission planning and training in the ground.

Research and Exploration of International Industrial Engineering-Oriented Talents Cultivation Mode

This article analyses the basic internationalization engineering personnel training needs, summarizes the current training situation, put forward notions of cultivating engineering professionals in the present circumstances to adapt to the internationalized education, and discuss the ways to better train industrial engineering students who can meet the internationalization requirements.