Design Method Research Articles

The Quality Of Baked Brownies Produce From The Subtitution Of Milit Flour

This study aims to analyze the effect of 25%, 50%, and 75% substitution of jewawut flour on the quality of the, aroma, texture and taste of the baked brownies produced. This type of research is an experiment using a completely randomized design method. The type of data used is primary data obtained from 3 expert panelists by filling out the organoleptic test format. Analysis of the data used is ANOVA, if there is a significant effect, continue with Duncan's test. The results showed there was no effect on the quality of the aroma, texture (congested), texture (dry) and taste of the baked brownies produced. The results of the best steamed brownies in the X3 treatment were in the sweetness category, tasted chocolate, and dark brown in color. It is suggested to the next researcher to process steamed brownies using a substitution of 75% of the amount of wheat flour used.

Design and analysis of a novel deployable grasping manipulator for space object capture

As a part of on-orbit services, the research on on-orbit capture has been receiving significant attention, given the increasing complexity of space activities and the growing number of spacecraft in orbit. The development of a high-adaptability and reliable capture manipulator is crucial due to the uncertainties involved in capturing space objects. Current manipulators face limitations in their capture principles and mechanical reliability, making it challenging to meet the requirements of modern space activities. To tackle this challenge, this paper proposes a novel deployable grasping manipulator, with the scissors-bending metamorphic cell as its core component. Just by introducing two variable kinematic pairs and several links into a typical scissors cell, deployment and envelope-bending with one degree of freedom (DoF) driving can be achieved. The cell metamorphic behaviors are analyzed through kinematic modeling, and its structural design is determined using the proposed bending radius and singularity design method. The integrated grasping manipulator is developed with a limb-reconfigurable design., A three-limb prototype is established for simulation and gravity-free grasping test, demonstrating its advantages of simple control, high kinematic reliability, grasping adaptability, and stability.

The Effect Of Jicama Flour Subtitution On The Quality Of Cat’s Tongue Cookies

This research is motivated by Cookies are small foods with a dense and crunchy texture that are made by baking or in the oven and last more than one month (Rahma Wati, 2013:26). There are various types of cookies in Indonesia, one of which is cat’s tongue cookies. Cat tongue cookies come from the Netherlands, in dutch these cookies are usually called “KATTE TONG”. Therefore, in this research the author used jicama flour as a partial substitute for wheat flour in making cat’s tongue cookies. This research aims to analyze the effect of 15%, 30%, 45% substitution of jicama flour on the quality of the shape, color, aroma, texture, and taste of the cat’s tongue cookies produced. This type of research is a pure ecperiment (true experiment) with a completely randomized design method with one factor. The type of data is primary data sourced from 3 expert panelists who filled in the organoleptic test format. The data obtained was tabulated in table form and analysis of variance (ANOVA) was carried out, if it was significantly different, it was continued with the Duncan test.

Hybrid electric aircraft design with optimal power management

The aviation industry has continuously improved its fuel efficiency over the last decades with innovations in technology, design and operation. Further improvements are becoming more difficult as current technology reaches complete maturity. Electrification of road vehicles is predicted to completely replace combustion engines in vehicles. As the efficiency and reliability of electric batteries and motors improve, so does the case for electric propulsion systems in aircraft. Jet fuel carries significantly more energy per weight than current state of the technology batteries, making complete replacement of fuel challenging. Hybrid electric propulsion, where both fuel and batteries are used to power propulsion systems could be feasible and improve fuel efficiency. Hybrid electric powertrains use electric power to reduce the power demands from the combustion engine. Electric batteries are discharged and charged during the operation based on power requirements.This paper presents an aircraft design method that includes optimized power management in the design loop. Power management determines battery discharging and charging throughout the design mission to reduce overall fuel consumption. Power management optimization provides the necessary feedback on battery and fuel performance to design battery pack size. This method is applied to regional aircraft, which typically fly the shortest routes of a commercial airline fleet. These short routes have proportionally longer climb and descent segments. These characteristics of regional aircraft routes lead to wider variations in power during operation, where hybrid electric powertrains are the most beneficial.The proposed hybrid electric aircraft design method finds that a serial hybrid electric regional aircraft could achieve significant fuel efficiency improvements to current regional aircraft. This result is in contrast of the current literature, which requires significant improvements to battery energy density, power distribution efficiency and electric motor efficiency to achieve similar fuel performance results. The hybrid electric regional aircraft does not outperform a traditional turboprop aircraft designed with identical objectives. The turboprop aircraft design improves even greater fuel efficiency improvements over current regional turboprop aircraft. This suggests two pathways are possible; the propulsion system of the next generation of regional aircraft could still be non-electric and achieve improved fuel burn improvements considering current technology or serial hybrid-electric powertrains configurations could be adopted in an expanded time horizon if optimistic technology development is done on battery power density to match the possible improvements of the proposed turboprop aircraft.

An efficient low-delay polyphase implementation method for active noise control systems

When implementing active noise control systems on signal processing hardware, the time delay introduced by electronic components (especially components requiring additional lowpass filters or introducing fixed-sample-size delays) may adversely affect the noise control performance. One common approach to reducing this delay is to use a high sampling rate, but this increases the computation significantly when implementing the ANC filters in real time. In the current work, a polyphase-structure-based filter design method is developed for active noise control systems that can reduce the computation load for real-time filter implementation but do not introduce an additional time delay. Although the computation reduction capability of a polyphase filter structure is well known for multi-rate systems, the traditional use of such multi-rate systems requires additional anti-aliasing and reconstruction filters which introduces an additional time delay. Thus, in delay-sensitive applications, such as active noise control, this method was previously applied only on the filter adaption phase, instead of directly on the real-time filtering process. In this article, a filter decomposition method using the minimum-phase technique is proposed to decompose an ANC filter into two multiplicative causal filters both of which have lowpass frequency response shapes at high frequencies such that the polyphase structure can be applied directly to the two multiplicative causal control filters without introducing additional anti-aliasing and reconstruction filters. Results show that, compared with various traditional low sampling rate implementations, the proposed method can significantly improve the noise control performance. Compared with the non-polyphase high-sampling rate method, the real-time computations that increase with the sampling rate are improved from quadratically to linearly.

Clinacanthus nutans crude polysaccharide extract as a green platform for microwave-assisted synthesis of silver nanoparticles: Optimization, characterization, and evaluation of bioactivities

Clinacanthus nutans (C. nutans) is a plant in tropical Asia with proven biological activities. The optimized extraction method of C. nutans crude polysaccharide (CNP) uses water in the presence of an ultrasound-assisted mechanical method (UL_CNP). However, the use of UL_CNP for the synthesis and optimization of silver nanoparticles (AgNP), particularly their anticancer and photocatalytic properties, remains unexplored. Hence, this research aimed to employ a green method using UL_CNP and silver nitrate to produce AgNP (UL_AgNP) with a small size and assess its potential toxicity, anticancer, and photocatalytic activities. The synthesis condition was optimized using the Box–Behnken design method. The synthesized UL_AgNP showed the surface plasmon resonance peak at 458 nm. The optimized synthesis condition produced spherically shaped UL_AgNP with a size of 5.21 ± 1.92 nm and a zeta potential of −26.33 ± 0.93 mV. An X-ray diffraction analysis exhibited intense Bragg's reflection peaks at (111), (200), (220), and (311), having a face-centered cubic structure of AgNP. Attenuated total reflectance-Fourier-transform infrared spectroscopy and energy-dispersive X-ray spectroscopy further confirmed the presence of silver in the synthesized UL_AgNP. The brine shrimp lethality test of UL_AgNP reported a lethal concentration 50 value of <7.8 μg/mL after 24 h. The UL_AgNP exhibited antiproliferative activity against MCF-7 cells with a half-maximal inhibitory concentration value of 4.96 ± 0.31 μg/mL by inducing S-phase cell cycle arrest, apoptotic effect, and reduction of cell migration. Furthermore, UL_AgNP proved its efficient photocatalytic activity against methylene blue dye (50.22 % ± 0.06 %, after 10 min at a concentration of 50 μg/mL). Therefore, the UL_AgNP exhibited promising antiproliferative activity against MCF-7 cells, highlighting their potential as a therapeutic agent. Further investigations are needed to elucidate the precise mechanism of their action.

Development of a Fast Positioning Platform with a Large Stroke Based on a Piezoelectric Actuator for Precision Machining.

In this paper, a fast positioning platform (FPP) is proposed, able to meet simultaneously the requirements of large stroke and high frequency response, developed based on a PZT (piezoelectric actuator) and a quad-parallel flexible mechanism, for application in precision machining. The FPP is driven by a high-stiffness PZT and guided by a flexible hinge-based mechanism with a quad-parallel flexible hinge. The proposed quad-parallel flexible hinge mechanism can provide excellent planar motion capability with high stiffness and good guiding performance, thus guaranteeing outstanding dynamics characteristics. The mechanical model was established, the input and output characteristics of the FPP were analyzed, and the working range (output displacement and frequency) of the FPP was determined. Based on the mechanical model and the input and output characteristics of the FPP, the design method is described for of the proposed FPP, which is capable of achieving a large stroke while responding at a high frequency. The characteristics of the FPP were investigated using finite element analysis (FEA). Experiments were conducted to examine the performance of the FPP; the natural frequency of the FPP was 1315.6 Hz, while the maximum output displacement and the motion resolution of the FPP in a static state were 53.13 μm and 5 nm, respectively. Step response testing showed that under a step magnitude of 50 μm, the stabilization times for the falling and rising edges of the moving platform were 37 ms and 26 ms, respectively. The tracking errors were about ±1.96 μm and ±0.59 μm when the amplitude and frequency of the signal were 50 μm, 50 Hz and 10 μm, 200 Hz, respectively. The FPP showed excellent performance in terms of fast response and output displacement. The cutting test results indicated that compared with the uncontrolled condition, the values of surface roughness under controlled conditions decreased by 23.9% and 12.7% when the cutting depths were 5 μm and 10 μm, respectively. The developed FPP device has excellent precision machining performance.

Kualitas internal telur ayam ras yang direndam larutan daun kelor dengan lama penyimpanan selama 21 hari

This study aims to determine the quality of broiler chicken eggs soaked in Moringa leaf solution. This research was conducted by immersing purebred chicken eggs in Moringa leaf solution for 1 day and using a Completely Randomized Design (CRD) method with a sample of 80 purebred chicken eggs consisting of 4 treatments where each treatment consisted of 4 replications and each replication consists of 5 samples. Each treatment of the experimental design used in this study was P0 (without treatment), P1 (addition of 20% Moringa leaf solution), P2 (addition of 30% Moringa leaf solution), P3 (addition of 40% Moringa leaf solution). The variables observed were egg Kuningindex, egg white index and air voids.The results of the study showed that soaking chicken eggs in Moringa leaf solution at P3 (soaking in 40% Moringa leaf solution) had a real effect on the egg white index. The results of the extension evaluation carried out in the Pesona Mutiara Farmer Women's Group,

Method for designing a grid-slit spectrometer with low spectral-line bending

The classic single-slit spectrometer exhibits low field utilisation in the direction of the slit width and requires a push-broom observation method to visualise moving point targets. Therefore, we designed a spectrometer with a grid slit to overcome these limitations. First, a grid slit composed of two sets of vertically arranged slit arrays, each containing five slits, was established. Then, the spectral-line bending of the off-axis slits was analysed, and the parameters of the dispersive elements that minimised the spectral-line bending of the slit arrays were selected as the initial values. Next, a merit function was established to consider the systematic distortion, and finally, the system was optimised. The proposed spectrometer design enabled a grid slit with 10 slits to be implemented, which significantly enhanced the field utilisation of the spectrometer and enabled starting-observation-mode operation. The spectral-line bending of each slit was less than 0.21 μm (less than one-third of a pixel size) and the modulation transfer function was higher than 0.7 (@45.45 lp/mm). The design and analysis results confirmed the feasibility of the proposed grid-slit design method, which can potentially be applied to other spectrometers to improve their field utilisation or to enable starting-observation-mode operations.

Tradeoff analysis of the energy-harvesting vehicle suspension system employing inerter element

This paper explores the vibration isolation performance and vibration energy recovery performance of an energy-harvesting vehicle suspension system employing inerter element. The study takes into account the structural changes in the suspension caused by introducing the inerter as a new type of vibration isolation element. According to the parallel-series combination of an inerter and a damper, two different structures of energy-harvesting suspension dynamic models are constructed. The mechanism of the suspension parameter uptake on vehicle ride comfort and energy-harvesting characteristics is analyzed. A multi-objective optimal design method for the energy-harvesting vehicle suspension system employing inerter element is proposed, which considers both vehicle ride comfort and energy-harvesting characteristics. A trade-off was found between suspension isolation performance and energy-harvesting efficiency. The results indicate that various structures of energy-harvesting vehicle suspension systems employing inerter element exhibit different vibration isolation performances. Compared with the conventional energy-harvesting suspension, the series structure reduces body acceleration by 15.9 %, and the root mean square (RMS) of energy-harvesting power of the suspension is 22.2 W. The parallel structure reduces the RMS of body acceleration by 14.3 % and the RMS of energy-harvesting efficiency is 56.3 %, with the RMS energy-harvesting power of 84.9 W. The parallel structure demonstrates superior overall performance.

Seismic design of buildings in the context of regions: A case study of a site in Semnan city, Iran

The seismic codes focus on single buildings and ignore the interdependencies between various sectors and infrastructure. This approach cannot ensure resilient communities and ignores essential aspects of seismic risk (e.g., exposure element). This paper proposes a regional-based design (RBD) method that considers the performance of individual components as well as the interactive consequences of their design on the communities. Unlike most studies, the proposed RBD method considers a dynamic behavior for a region/city and utilizes its master plan to model the stochastic variations in the future built environment. The method determines buildings' seismic design requirement (SDR) by considering the building-level and regional goals. Building-level goals address the most important performance objectives (e.g., safety in residential buildings) and should be satisfied for each structural system and occupancy. However, the method satisfies the regional goals for any structural system. This implies that if (hypothetically) all the buildings in a region/city were designed and constructed with only one structural system (e.g., special steel moment resisting frames, SMRFs), the regional goals should be satisfied. The method starts with the determination of the SDRs by satisfying equal building-level objectives for each occupancy in various locations of the region with one structural system. Then, to achieve the regional goals, the calculated SDRs are uniformly raised to improve the performance of the buildings (if required). The method also considers factors other than the buildings/facilities' performance that could affect the achievement of the regional goals (e.g., emergency response capacity). As a proof-of-concept, the proposed method is used in a site in Semnan City, Iran, to determine the SDR of steel SMRFs. The case study shows that there might be situations where elevating the seismic design requirements of the buildings could not guarantee the achievement of some regional goals. Moreover, the results indicate that factors like the design of the built environment could affect regional risks. Therefore, attention to factors other than the buildings' seismic performance is also essential in achieving the regional goals.

Optimal design and performance evaluation of grinding wheels with triply periodic minimal surface lattice structure

High-performance grinding wheels are critical tools for precision surface generation. In precision grinding processes, the coolant supply at the wheel-workpiece interface is critical for reducing grinding temperature and detrimental friction. For better lubrication and chip removal performance, the cavities or pores need to be generated throughout the grinding wheel. The ideal morphology of pores in grinding wheels should be inter-connected and capable of providing sufficient coolant. Conventional grinding wheel design and fabrication methods can only passively generate closed circular pores by using pore-forming agents. Increasing the percentage of pores in this way generally leads to an uncontrollable reduction in mechanical strength, while the closed pores are insufficient in cooling performance. In this paper, the grinding wheels with triply periodic minimal surface lattice structure are designed and fabricated, which achieves the regulable and inter-connected internal structure of grinding wheels. Meanwhile, to balance the relationship between the structural properties and performance indicators of porous grinding wheels, an optimal design method for the porous structure of grinding wheels is proposed. Finally, the grinding performance of the novel grinding wheels in comparison to electroplated diamond grinding wheels is investigated in terms of grinding force, specific grinding energy and ground surface roughness.

Subjective cognitive concerns not related to objective impairment in patients with somatic symptom and related disorders

ABSTRACT Objectives Patients with Somatic Symptom and Related Disorders (SSRD) report subjective cognitive concerns, and research indicates that they show objective cognitive impairment. This study explored the value of subjective concerns flagging objective impairment. Furthermore, we investigated whether coping moderated this relationship, and the role of depressive symptomatology. Method In a cross-sectional design, objective impairment was measured with an extensive neuropsychological assessment; subjective concerns with the Cognitive Failure Questionnaire; coping styles with the Coping Inventory of Stressful Situations; and symptoms of depression with the Patient Health Questionnaire- 9. Results The results show that subjective concerns are of limited value in signaling objective impairment in patients with SSRD. Regression analyses performed on data from 225 patients showed that symptoms of depression (β = .32) were the main predictor of subjective concerns, which were unrelated to objective impairment. Coping was not a moderator, but patients with emotion-oriented coping styles had more subjective concerns (β=.40), and conversely, patients with avoidance- and/or task-oriented coping styles had less (respectively, β=-.27 and β=-.24). Conclusions These results align with the Somatosensory Amplification Theory; patients with SSRD may amplify benign cognitive failures and experience them as intrusive, noxious, and more intense. In patients with SSRD, subjective cognitive concerns are more related to psychological constructs (symptoms of depression and coping styles) than to objective impairment.

Enhancing mechanical properties of additively manufactured voronoi-based architected metamaterials via a lattice-inspired design strategy

Voronoi-based architected metamaterials have gained significant recognition as promising candidates for bone defect repair implants. However, the demanding requirements for reliable and adjustable load-bearing capacity pose challenges in applying irregular Voronoi-based architected metamaterials in implant applications. In this study, we propose a lattice-inspired design methodology for these metamaterials, enabling precise control over topologies and porosities to enhance their mechanical properties. We demonstrate the influence of unit cell topology on the printability, mechanical properties, and permeability of lattice-inspired Voronoi-based metamaterials (LIVMs) fabricated via laser powder bed fusion (LPBF) additive manufacturing. The LPBF-printed LIVMs exhibited yield strengths ranging from 3.35 to 17.59 MPa and specific energy absorption ranging from 3.81 to 14.29 J/g. Through finite element modeling and experimentation, we show that the deformation behavior of LIVMs with various topologies plays a crucial role in enhancing mechanical performance through mechanisms such as homogeneous load transfer between unit cells and multistage-contact strengthening within a unit cell. Additionally, we analyze the impact of unit cell type and porosity on the mass-transport behavior of LIVMs using computational fluid dynamics simulations. The LIVMs achieved experimental permeability values ranging from 3.88 × 10−9 to 16.83 × 10−9 m2 (consistent with trabecular bones), indicating that multiple fluid flow channels can be utilized to enhance mass transport by distributing flow pressure and increasing fluid mobility. The proposed design method effectively achieves a favorable combination of superior mechanical properties and tunable permeability in Voronoi-based architected metamaterials. These findings provide valuable theoretical guidance for the development of architected metamaterials for bone implant applications.

A soft robotic system imitating the multimodal sensory mechanism of human fingers for intelligent grasping and recognition

The sensory function is crucial for achieving precise feedback control and environmental interaction in soft robots. Therefore, the multimodal sensory capabilities that mimic human fingers have always been a research hotspot. This study proposes a design method for a soft robotic gripper that can emulate the multimodal perception mechanism of human fingers and achieve high-precision recognition of grasped objects using machine learning algorithms. In addition, a finger texture structure inspired by human fingerprints is designed using a negative pressure-induced buckling method to enhance the soft gripper's ability to perceive minute surface textures. Inspired by slow adapting (SA) receptors and fast adapting (FA) receptors of human fingers, we have innovatively designed a capacitive curvature sensor (CS) and a triboelectric texture sensor (TS) to detect the size, material, and texture of objects. Furthermore, a non-contact medium identification sensor (MIS), having a sensitivity of more than 1300 times higher compared to the traditional MISs, is fabricated using the principle of electromagnetic resonance. It is shown that by employing a deep learning-based multi-channel feature fusion network, the soft grasping system with multimodal sensing has achieved a recognition accuracy of 98.43 % for different objects. This work provides an innovative approach for the application of soft robots in various fields, such as logistics sorting and food safety.

Erosion-corrosion behavior of Ni-Al-Cu coating on nickel-aluminium bronze alloy in 3.5 wt% NaCl solution

A Ni-Al-Cu coating was prepared on NAB alloy through electroplating and heat treatment, and the erosion-corrosion behaviors were investigated. The results demonstrated that Ni-Al-Cu coating exhibited higher erosion resistance compared to NAB alloy, with an average reduction of 63 % in material removal rate (MRR). It was revealed that deformation and cracks were observed in NAB, with loss of hard κ and β phases alongside deformation of ductile α phase. Meanwhile, Ni-Al-Cu coating experienced fatigue delamination and grain disintegration due to alternating stress. Taguchi design method showed that increasing flow velocity and sand concentration could enhance the intensity of gravel impact, while changes in the erosion angle affected gravel impact modes and energy transfer, thereby impacting corrosion performance. Additionally, empirical equations for the material removal rate were derived through regression analysis, which became possible to predict the MRR under different influencing factors and assess the erosion-corrosion resistance of materials.

Optimization and Evaluation of Accelerated Corrosion Tests Based on Mechanism Equivalence Principles.

Conventional indoor corrosion test design methods primarily focus on the rapid evaluation of material corrosion resistance, often neglecting the impact of environmental stress levels on the equivalence of corrosion mechanisms. This study introduces a novel indoor corrosion test design method based on the principle of corrosion mechanism equivalence, aimed at improving the accuracy of indoor accelerated corrosion simulations. We define the characteristic of corrosion mechanism equivalence as the Corrosion Mechanism Equivalence Degree (CMed), which quantifies the similarity between corrosion mechanisms in indoor accelerated tests and field tests. Then, modified conventional link function models are defined, integrating the probability distribution of environmental factors to estimate corrosion model parameters more precisely. Finally, an optimization problem is constructed for accelerated corrosion tests based on CMed, incorporating constraints on environmental stress levels and acceleration factors. A case study demonstrates the proposed method's ability to accurately simulate the actual service environment of materials, determining the appropriate stress levels for indoor accelerated corrosion tests while ensuring the desired acceleration factor and corrosion mechanism equivalence.

Research on battery heat generation characteristics and thermal management system applied to a typical eVTOL

Electric Vertical Takeoff and Landing (eVTOL) aircraft, as a highly promising future transportation mode, offers new possibilities for solving traffic congestion. Its unique flight mode and high power requirements present significant challenges for battery thermal management system design. Compared to electric vehicles, eVTOLs have totally different usage scenarios and operating conditions, leading to the fact that the thermal management system of conventional electric vehicles does not apply to eVTOLs. This paper proposes a battery thermal management design method for eVTOLs. The energy and power requirements for a short-distance eVTOL flight are determined through theoretical calculations. Additionally, experimental studies explore the thermal characteristics of a 61.5Ah lithium-ion battery under flight discharge conditions. Moreover, a battery thermal management system, which combines flat heat pipes and ram air, is analyzed through numerical simulations. Furthermore, this study investigates the effects of various air temperatures, air inlet mass flow rates, and fin spacing on the performance of the thermal management system. Finally, under the flight discharge cycle of a 61.5 Ah lithium-ion battery, with the environment temperature of 20 °C, the temperature can be controlled within 38.46 °C. The temperature difference can be cooled within 3.85 °C by the passive cooling system. Even at an extreme environment temperature of 40 °C, the battery temperature can still meet the standard. Meanwhile, comparing from multiple dimensions, this solution has a better overall performance than the traditional liquid cooling solution, which provides a foundation for designing a battery thermal management system for eVTOLs.

Coach-athlete attachment and athlete burnout: testing longitudinal mediation via cognitive reappraisal and expressive suppression

ABSTRACT Athlete burnout is a psychological syndrome that leads to emotional and physical exhaustion, a reduced sense of achievement, and sport devaluation among athletes. Drawing on attachment theory and the emotion regulation model of attachment, this study aimed to explore the potential mechanism of the relationship between coach-athlete attachment and athlete burnout. We employed a two-wave longitudinal design method to track 352 adult athletes in China, from which 258 completed the entire data collection (Mage = 22.2; SD = 3.2 years; 68.2% male). Results of the cross-lagged panel model for a half-longitudinal design showed that secure attachment was negatively linked to athlete burnout through cognitive reappraisal and expressive suppression, and avoidant attachment was positively linked to athlete burnout through expressive suppression. Our study applies attachment theory to the literature on athlete burnout and emphasises the importance of emotion regulation. The findings encourage coaches and sports-related therapists to develop appropriate interventions targeting attachment style and cognitive reappraisal training to reduce the risk of athlete burnout.

A design method for continuous fiber-reinforced composite patches

The urgent need for lightweight and high-strength patches in the field of aircraft structural repair has propelled continuous fiber-reinforced thermoset composites into a research hotspot. However, constrained by manufacturing processes, the designs of composite repair structures primarily focus on external shape and ply layup. These approaches presently lack design methods for the internal fiber adaptability of patches driven by in-service loads. In this paper, we proposed a method for fiber distribution and orientation design based on maximum normal stress. The composite simulation model was established based on fracture toughness. The influence of tensile-shear coupling effects on the mechanical response of composites and the fiber orientation design were examined in the study. The orientation-density coupling effects on the enhancement of patch strength were also analyzed. Furthermore, additive manufacturing technology was employed to fabricate thermoset composite patches. The results show that the composite patches designed in this paper exhibit a 10.50 % improvement in strength compared to traditional unidirectional patches.