Information on the doctoral thesis of PhD candidate Phi Hoang Trinh (revised version after the Institute-level Thesis Evaluation Council)

Full name of PhD candidate: Phi Hoang Trinh

Collective of scientific supervisors: Assoc. Prof. Dr. Nguyen Thanh Quang and Assoc. Prof. Dr. Hoang Van Got

Major: Mechanical Engineering - Code: 9520103

Training institution: National Research Institute of Mechanical Engineering - Ministry of Industry and Trade

Thesis title: Study on the influence of some seat structural parameters on the vibration of the seated occupant in a vehicle.

Summary of the new findings of the thesis

1. Scientific significance:

- The study established the relationship between some technical parameters in the Road - Vehicle - Seat - Human interaction with the varying parameters of the passenger seat structure in automobiles.

- Combined two solution methods of Lagrange type II theory and finite element theory to solve the overall model: Road - Vehicle - Seat - Human.

- Analyzed seat structure with parameters such as stiffness, damping, frame structure, springs, welds, connecting pads, backrest pads... Selected stiffness and damping parameters of the seat base as representative by changing the seat base stiffness when adding intermediate pads. The results demonstrated the issue of the influence of seat structure on the seated occupant's vibration when using four different pad materials.

- Conducted experiments on a real Toyota Vios 5-seater vehicle, establishing the relationship between input parameters: Road surface roughness from sinusoidal and pulse-shaped speed bumps and random road surface ISO 8608; Vehicle speed; Material of vibration-absorbing pads. Output parameters: Vibration acceleration and vibration frequency of the vehicle floor, vibration acceleration on the human body according to RMS values corresponding to ISO 2631-1 standard.

 2. Practical significance

- The results of the thesis can be applied as reference material for research, teaching, and design of seats in some vehicles suitable for Vietnamese conditions.

- The study established the relationship between some technical parameters in the Road - Vehicle - Seat - Human interaction with the varying parameters of stiffness and damping of the seat structure in automobiles.

- Determined vibration at three positions on the seated human body: buttocks, chest, and head as representative positions, which can be applied to all body positions.

 3. New contributions of the thesis

- The thesis established a set of parameters for the seat structure of a vehicle with independent suspension, suitable for human physique and road conditions in Vietnam.

- Studied the influence of seat structure on the user, aiming to enhance comfort and convenience suitable for operating conditions in Vietnam.

- Developed a Road - Vehicle - Seat - Human model using modern simulation tools, allowing investigation of the impact of road surface roughness on human body vibration, thereby determining the stiffness and damping of vibration-absorbing pad materials to reduce excitation forces on the seated occupant to ensure health. The research can be extended to analyze all seat structural details.

View the detailed content of the thesis of PhD candidate Phi Hoang Trinh here