To in vestigate the consistency of results from outdoor exposure and xenon lamp aging tests on exterior plastics, 8 kinds of materials are selected to compare their appearance, clolr difference, gloss and tensile strength, and correlation coefficient is used to analyze the correlation between the two tests. The research results show that results of xenon lamp aging and outdoor exposure vary for ditferent materials, among which 6 materials have more severe results after Hainan exposure than Dunhuang exposure. For PMMA+ASA, PC and PMMA, SAE J2527 cannot accurately simulate exposure results in Hainan region. Furthermore the changes of tensile strength after xenon arc exposure 4 000 kJ are the same as 2 years outdoor exposure.

To improve the service life of automotive brake pedals, this paper investigates the impact of different factors affecting the fatigue failure of automotive pedal components, applies the Fault Tree Analysis (FTA) method to solve the structural importance of components through the minimal cutset. The frndings indicates that material and load are the primary causes affecting the life of brake pedal components, with stress concentration being a seeondary cause. Taking a heavy truck brake pedal Finite Element(FE) model as an example, the finite element software Hypermesh and fatigue software nCode are used for predication and analysis, and the stiffness test experiment of the pedal is carried out to verify the rationality of the model.

To address the issues of long construction cycles and outdated, complicated solutions in traditional ANDON information display systems, this paper proposes a design approach that emphasizes lightweightness, low-code development, ease of operation, and rapid deployment. Starting from these principles, this paper outlines the functional requirements and presents a design scheme for information display, covering both hardware and software components.Based on this scheme, an integrated information display system based on Android industrial hosts is designed. This system incorporates features such as remote management and control of information boards, real-time data collection and display, design and management of board display modes, data resource management, notification delivery, and broadcast control. These features are achieved through pre-installed apps on the hosts, drag-and-drop interface development, encapsulation of dedicated functions, low-code design, and remote deployment monitoring.

Regarding the issue of the assembly torque of the aluminum alloy bushing of the subframe and the connecting bolts to the body of a certain model exceeding the upper limit of the monitoring window and triggering an alarm, through the analysis of the bolt assembly curve, it is found that the reason for alarm is that when the assembly torque reaches the upper limit of the monitoring window, the bolt tightening has not reached the process angle yet (this position is assembled by using the torque angle method). The comparison results between the bolt states of normal assembly and alarm show that the anti-slip teeth under the bolt head of assembly alarm is embedded in the gasket, while the anti-slip teeth of the gasket of the normal assembly bolt is embedded in the aluminum alloy bushing. The anti-slip teeth embedded in the gasket under the bolt head of the assembly alarm will drive the gasket to rotate, resulting in an increase in the friction diameter, friction coefficient of the bolt head, and assembly torque, thereby causing the assembly curve alarm. The embedding of anti-slip teeth under the bolt head into the gasket is due to insufficient heat treatment of the gasket, resulting in a softer hardness that is lower than the design required value.

To address the safety concerns of Proton Exchange Membrane Fuel Cell Electric Vehicles (PEMFCEV), this paper uses the fault tree method to explore the factors affecting the safety of PEMFCEV, analyzes the potential safety hazards of proton exchange membrane fuel cell systems, power batteries and high-voltage electrical circuits, and elaborates the current domestic and foreign PEMFCEV manufacturers’ safety prevention and control strategies adopted for hydrogen leakage, power battery, and electrical safety. The results show that the current safety measures for PEMFCEV can prevent and control foreseeable safety risks.

With the aluminum bracket of a new energy vehicle power battery as the research object, the level set method is employed to perform topological optimization on the power battery bracket. During the optimization process, factors such as structural stiffness, strength, fatigue, and dynamic safety are comprehensively considered. The optimization results are interpreted and the structure is reshaped to obtain a new structure that meets the requirements. The reshaped structure undergoes sensitivity analysis to identify sections requiring optimization. Through topology optimization, a reasonable cross-sectional shape is obtained, and the optimized structure is verified to ensure performance enhancement. Upon comparison, the optimized power battery bracket exhibits a 5.9 Hz increase in first-order modal compared to the original structure, with an overall stiffness improvement of 18.2%. The results for stiffness, strength, and random vibration are superior to the original structure. Fatigue analysis indicates that the damage to the new structure is less than 1, indicating its superiority over the original structure. Additionally, the weight of the optimized battery bracket is reduced from 209 kg to 180 kg, representing a weight reduction ratio of 13.8%.

Aiming to three cases of premature failure of steel wheels during bending fatigue and radial fatigue tests, this paper analyzes the influence of materials processing technology on wheel fatigue performance using fracture scanning, energy spectrum surface scanning, microstructure, and low magnification experiments. The shows that the aggregation of small-sized inclusions in materials, improper parameters in the synthesis welding of wheel rims and spokes, and incorrect parameters for flash welding of wheel rims all lead to the weakening of wheel fatigue performance.

In the lithium-ion battery ternary anode materials, trace elements affect the battery performance directly, in this study, an analytical method for simultaneous determination of 19 trace elements including Nb, B, Zr, Sr, Ta, Ti, Y, La, Ga, Cu, Fe, K, Mg, P, Na, Al, Cr, Mo and Zn in ternary anode materials of lithium ion batteries is established by inductively coupled plasma emission spectrometry. The influence of different solvents on the determination of trace elements in ternary anode materials is investigated, and the best sample solvent is determined. The results show that the method is simple, rapid, and has good repeatability and reliability. The relative standard deviation of each element is 0.58%~3.56%, and the recovery is 91.81%~104.91%, which can fully meet the needs of trace element content analysis of ternary cathode materials.

Through-type tail lamp of a vehicle type cracks and fails during road test and it is confirmed by analysis of the cracking position that the failure is a kind of interface fatigue cracking. To address this issue, the paper confirms that mismatch between thermal expansion coefficient of Heterotropic material and mechanical properties is the cause of failure cracking. Stress distribution of lampshade is calculated by CAE software combined with sun exposure test, which shows that the stress distribution location is consistent with physical lampshade cracking. In combination of the evaluation of stress result by means of S-N curve, it rationally explains the seasonal pattern of cracking. This method is used to evaluate through-type tail lamp with different materials, colors and structures, the results shows that the highest risk of cracking appears in through-type tail lamp made from black styrene, ASA and transparent Polymethyl Methacrylate (PMMA), which is consistent with the law of after-sales statistics data.

The inner-dash sound insulation pad is an important part of the automobile firewall assembly. This paper studies the influence of different sound insulation pad materials, coverage rate, thickness distribution of soft layer and installation process characteristics of accessories on the sound insulation performance of the firewall assembly. The sound insulation performance of the firewall assembly of a vehicle model is optimized and improved through selecting appropriate material composition and soft layer thickness, improving the coverage rate of the sound insulation pad, and reducing the leakage amount.