Ball Joint Research Articles

МЕХАНИЗМ ИЗНАШИВАНИЯ ПАР ТРЕНИЯ В ШАРНИРНЫХ СОЕДИНЕНИЯХ РУЛЕВЫХ ПРИВОДОВ АВТОМОБИЛЕЙ

Wear mechanism of friction pairs in the articulated joints of steering gears of UAZ-Hunter -315195 cars is considered. The wear process of friction pairs "bush (cup) – ball pin" closed with spherical spring washers and a spring cap used in the design of the swivel joint of the car steering gear is described. The effect of fretting corrosion on the destruction of a ball joint is studied.

Dynamic response of offshore triceratops under regular waves with tether postulated failure

Triceratops are innovative offshore platforms that consist of a deck, three buoyant legs, and ball joints. Their deck is supported by buoyant legs, which, in turn, are restrained on the sea bed using taut-moored tubular tethers. Ball joints partially isolate the deck from the buoyant legs by restraining the transfer of rotations from the legs to the deck. Triceratops platforms exhibit a monolithic structural action in the vertical plane and a hybrid dynamic behavior resembling tension leg platforms and spar buoys. The present study investigates their dynamic response in regular waves. Response amplitude operators (RAOs) are estimated for intact and postulated failure conditions of the tethers. Based on detailed numerical investigations, it is seen that the pitch response of the deck increases significantly under the postulated failure of tethers, which are otherwise absent due to the presence of ball joints. Marginal change in surge response, even under tether failure, confirms the suitability of triceratops for ultra-deepwater installations. The fatigue life of tethers before and after postulated failure conditions is compared using the S-N curve approach and noticed that the adjacent tethers’ fatigue life reduces significantly under postulated failure conditions of tethers.

Automated Shoulder Implant Manufacturer Detection using Encoder Decoder based Classifier from X-ray Images.

Total shoulder arthroplasty is the process of replacing the damaged ball and socket joint in the shoulder with a prosthesis made with polyethylene and metal components. The prosthesis helps to restore the normal range of motion and reduce pain, enabling the patient to return to their daily activities. These implants may need to be replaced over the years due to damage or wear and tear. It is a tedious and time-consuming process to identify the type of implant if medical records are not properly maintained. Artificial intelligence systems can speed up the treatment process by classifying the manufacturer and model of the prosthesis. We have proposed an encoder-decoder based classifier along with the supervised contrastive loss function that can identify the implant manufacturer effectively with increased accuracy of 92% from X-ray images overcoming the class imbalance problem.

Comparing Prognosis of Hip Replacement Outcomes with and without Post-Operative Physiotherapy Sessions: A Five-Year Retrospective Review (2018-2022)

The hip joint is a ball and socket joint that supports body weight and is responsible for locomotion. Hip replacement surgery is mostly performed when hip pain significantly impedes daily life activities and when non-surgical treatments are ineffective in certain cases. The most common cause of hip replacement is damaged hip joint, which can cause arthritis. Therefore, physical therapy after the replacement surgery of major joints is generally considered helpful for a good prognosis. However, if the patients are given the usual care recommended by the surgeons, the patients recover in the same manner as they do with the physical therapy sessions or the physical therapy usually accelerates the recovery process and prevents future complications. Thus, the current study provides a comprehensive of the recovery of patients who have undergone hip arthroplasty, with or without physical therapy training programs.

Multibody Dynamics of Cross Groove Constant Velocity Ball Joints for High Performance Racing Applications

Accurate prediction of constant velocity joint transient contact loading and complex kinematics is necessary to improve joint design and prevent incurring failure from rolling contact fatigue. A detailed multibody dynamic model is presented for cross groove constant velocity joints used in high performance automotive racing applications, hitherto not reported in the open literature. The developed model includes detailed contact mechanics and friction models for all contacts made between the components. A novel semi-Hertzian contact model is adopted for the cage-race conjunction. Local contact kinematics is evaluated based on a methodology used in tribological analysis. The proposed model is validated against available computational models provided in literature for cross groove designs. Using the model, contact pressures occurring in the ball-race and ball-cage contacts are shown to reach levels as high as 4 and 5 GPa, respectively. The assumed value of friction coefficient is shown to have a strong influence on the predicted contact forces. Local contact motions are presented for the ball-race and ball-cage contacts, demonstrating complex motion which varies between pure rolling and pure sliding within a single cycle.

Cylindrical Billet Size Optimization for Hot Closed-Die Forging of the Upper Ball Joint

Three-dimensional finite element modeling (FEM) has been carried out using QForm software on the hot forging operation of the upper ball joint, involving the process of roughing and finishing. The material used is SNCM8 commercial alloy steel. This paper aims to optimize the initial billet size to achieve a final forged product without any defects. To accomplish this task, it was necessary to determine the initial optimum billet size by calculating the mass ratio. It is more practical to reduce the length of the initial billet and keep the diameter constant. The initial billet size was obtained by FE simulation by varying the five cases of mass ratio. The minimum dimension of the initial billet, which filled the die cavity without defects, was selected for the tryout experiments. The experimental results supported the FEM results and indicated that the optimum size was ∅48x152.88 mm, which may reduce material waste by 17.65%. Additionally, the forging load during the forging process was investigated. The actual forging load was slightly higher than the experimental one. The forging load showed a maximum error about 10.13%. Finite element simulation by QForm V10.1.6. software is recommended as an efficient tool for predicting the hot deformation behavior of the material during several stages of hot forging, which can save material costs and the cost of trials, leading to enhancements in the manufacturing process.

Embodied latch mechanism of the mandible to power at ultra-high speed in the trap-jaw ant Odontomachus kuroiwae.

Rapid movements of limbs and appendages, faster than those produced by simple muscle contraction alone, are generated through mechanical networks consisting of springs and latches. The latch plays a central role in these spring-loaded mechanisms, but the structural details of the latch are not always known. The mandibles of the trap-jaw ant Odontomachus kuroiwae closes the mandible extremely quickly to capture prey or to perform mandible-powered defensive jumps to avoid potential threats. The jump is mediated by a mechanical spring and latch system embodied in the mandible. An ant can strike the tip of the mandible onto the surface of an obstacle (prey, predator or ground) in order to bounce its body away from potential threats. The angular velocity of the closing mandible was 2.3×104rads-1 (1.3×106degs-1). Latching of the joint is a key mechanism to aid the storage of energy required to power the ballistic movements of the mandibles. We have identified the fine structure of two latch systems on the mandible forming a 'ball joint' using an X-ray micro-computational tomography system (X-ray micro-CT) and X-ray live imaging with a synchrotron. Here, we describe the surface of the inner section of the socket and a projection on the lip of the ball. The X-ray live imaging and movements of the 3D model show that the ball with a detent ridge slipped into a socket and over the socket ridge before snapping back at the groove edge. Our results give insight into the complex spring-latch systems that underpin ultra-fast movements in biological systems.

Effects of Shooting with A Reduced Hoop Diameter Rim on Kinematics of a Basketball Free-Throw

The purpose of this study was to determine the effects of a reduced rim diameter (diameter 0.30 m) upon the kinematics of basketball free-throws. Ten male basketball players (mean ± s; age 17.1 ± 0.4 years, height 1.85 ± 1.43 m, mass 79.0 ± 5.3 kg) performed 8 direct successful free throws; 4 when using a standard 0.45 m diameter rim, and 4 with an 0.3 m diameter rim. Ball release parameters and joint angles at ball release were determined for each participant. The smaller rim was associated with significant increases (p < 0.0001) in ball release angle, ball release velocity, ball release height and shoulder joint angle at release. The reduced diameter rim can be advocated as a tactic for developing a higher ball release angle when training the shooting technique of young basketball players; this is likely to maximize the probability of a successful free-throw when attempted into a standard rim.

METAL-BASED THREE-DEGREE-OF-FREEDOM ACTUATOR WITH SHAPE MEMORY

A three-degree-of-freedom actuator was implemented using shape memory metals (SMA) for two-dimensional movement. In its design, a CAD software was used, analyzing the movements made by a ball joint, obtaining a conical body with a circular base. For its movement, a one-way SMA spring arrangement was implemented as opposed to a two-way one for displacement in each of the XY axes, and its rotation by means of a bearing coupled to the axis of the body that allows rotation in one direction. actuator. An on-off control was implemented based on a kinematic study that can be manipulated through an interface that, according to the temperature and position obtained, activates or deactivates the SMA elements. As a result, the working angle was determined in a two-dimensional plane of ±22.5° and 30º counterclockwise for its rotation, taking into account that its error grows as it moves away from its center.

A feasibility study of promoting osseointegration surface roughness by micro-milling of Ti-6Al-4V biomedical alloy

The reliability of a prosthetic implant needs durability, biocompatibility, and osseointegration capability. Accomplishing these characteristics, Ti-6Al-4V alloy is the main used material for implant fabrication. Moreover, it can be processed by additive manufacturing technique, permitting to meet the needs of patience-tailored, often complex shaped, prosthesis topologies. Once an implant is realized, it is finished by machining operations and its osseointegration capability is heavily influenced by the resulting surface roughness. Consequently, the assessment of this latter is mandatory to evaluate the prosthesis durability. This paper presents the analysis of surface roughness of Ti-6Al-4V micro-milled specimens produced by plastic deformation, selective laser melting, and electron beam melting processes. A central composite design was employed for planning the cutting tests. The comparison between surface roughness results and its values for enhancing osseointegration, firstly permitted to individuate the range of micro-milling suitable applications, which have been individuated as ball joints, bone plates, and screws. Next, the statistical analysis of the experimental measurements allowed the identification of the most influential micro-milling parameters together with the determination of the mathematical models of surface roughness by response surface methodology. The good comparison among calculated and experimental results revealed the reliability of the model, allowing the prediction of achievable surface roughness once micro-machining parameters are selected, or their optimization as a function of a desired surface roughness value.

Tether response of offshore Triceratops under hurricane conditions

The form-dominant approach is increasingly adopted in offshore platform design; triceratops is one of the very recent examples. These platforms are position-restrained by taut-moored tethers, which govern the dynamic response under extreme environmental loads. Due to the partial isolation of the deck from the buoyant legs in the presence of ball joints, sub-structure analysis is more critical. The present study examines the tether response of triceratops in 2400 m water-depth under hurricane conditions caused by 10-yr, 100-yr, and 1000-yr Gulf of Mexico (GoM) storms. The numerical studies show that the Peak-Wave case governs the dynamic tension variation of tethers for the chosen hurricane conditions. For the 100-yr and 1000-yr storms, they are about 15% and 45% higher than 10-yr storms, respectively. However, the maximum axial tensile stresses are about 8% of the yield, ensuring a no-rupture condition of the tethers. The service lives of the tethers for 10-yr storms are about one-third that of 100-yr and 1000-yr storms. A positive minimum tension for all load cases confirms no slackening of the tethers.

Bearing Design Science in Technologically of Different Materials for Textiles Industry

Design science of textile applications in technologically successful applications bearing the science of bearing design science according to the ancient Egyptians using various materials included pedal mechanisms, linear actuators, practical valve stems, trunnions, axles, reciprocating mechanisms, automobile joints and ball joints, office equipment, healthcare equipment, production equipment, agricultural machinery and design science of mechatronics of textile machinery and aircraft accessories.

Effects of preloads on middle-ear transfer function and acoustic reflex in ossiculoplasty with PORP

IntroductionSurgical outcomes in ossiculoplasty with partial ossicular replacement prostheses (PORPs) are greatly influenced by the amount of preload imposed on the PORP. In this study, the attenuation of the middle-ear transfer function (METF) was experimentally investigated for prosthesis-related preloads in different directions, with and without concurrent application of stapedial muscle tension. Different PORP designs were assessed to determine functional benefits of specific design features under preload conditions. MethodsThe experiments were performed on fresh-frozen human cadaveric temporal bones. The effect of preloads along different directions were experimentally assessed by simulating anatomical variance and postoperative position changes in a controlled setup. The assessments were performed for three different PORP designs featuring either a fixed shaft or ball joint and a Bell-type or Clip-interface. Further, the combined effect of the preloads towards the medial direction with tensional forces of the stapedial muscle was assessed. The METF was obtained via laser-Doppler vibrometry for each measurement condition. ResultsThe preloads as well as the stapedial muscle tension primarily attenuated the METF between 0.5 and 4 kHz. The largest attenuations resulted from the preload towards the medial direction. The attenuation of the METF with stapedial muscle tension was reduced with concurrent PORP preloads. PORPs with a ball joint resulted in reduced attenuation only for preloads along the long axis of the stapes footplate. In contrast to the clip interface, the Bell-type interface was prone to lose coupling with the stapes head for preloads in the medial direction. ConclusionsThe experimental study of the preload effects indicates a direction-dependent attenuation of the METF, with the most pronounced effects resulting from preloads towards the medial direction. Based on the obtained results, the ball joint offers tolerance for angular positioning while the clip interface prevents PORP dislocations for preloads in lateral direction. At high preloads, the attenuation of the METF with stapedial muscle tension is reduced, which should be considered for the interpretation of postoperative acoustic reflex tests.

Fault detection of automobile suspension system using decision tree algorithms: A machine learning approach

The study aims to detect multiple faults that are exhibited by suspension system components during prolonged usage. Faults such as strut worn out, strut external damage, strut mount fault, lower arm ball joint fault, lower arm bush worn out and tie rod ball joint fault were considered in this study. A novel approach is proposed in the present study that involves vibration signals and machine learning techniques to identify various suspension system faults. Vibration signals were acquired for different fault conditions (as mentioned above) at three different load conditions by a specially fabricated experimental setup. Statistical features were extracted from the acquired vibration signals from which the most significant features were selected using J48 decision tree algorithm. The selected features were provided as input to the tree-based family of algorithms to determine the best in class classification algorithm for suspension fault diagnosis. The results obtained enumerate that the random forest classifier produces the best classification accuracy for all the load conditions (no load, half load, and full load) with values of 95.88%, 94.88%, and 92.01%, respectively. Finally, the performance of the proposed classification model is compared with other state-of-the-art machine learning classifiers.

ВЫПОЛНЕНИЕ ГЕНЕРАТИВНОГО ДИЗАЙНА И АДАПТАЦИЯ К ИЗГОТОВЛЕНИЮ ПОВОРОТНОГО КУЛАКА. ЧАСТЬ I

The paper describes the calculation of input parameters for static strength analysis or generative design of the steering knuckle of a Formula Student race car. The initial data were: overall and mounting dimensions of the rim and tire, hub and brake disk, the magnitude of the force acting on the contact patch of the wheel with the road, the magnitude of the sliding friction force between the brake disk and brake pads, the force acting on the tie rod attachment, the location coordinates ball joint mounts and brake caliper. During the calculations, bearings were selected and forces on the coordinate axes were calculated, which must be applied to the part to simulate work loads. The calculation was performed by static methods. As a result, six load cases were obtained, simulating work in right and left turns with oversteer and understeer, as well as work during braking with maximum negative acceleration. Also, a 3D model of the steering knuckle was built, which has excessive strength (factor of safety is higher than 6). Padding values of the unchangeable areas have been defined, that prevent the generative design algorithm from subtracting material from important structural features of the part. The offset values were verified using additional finite element calculations.

Biomechanical Forces in the Tissue Engineering and Regeneration of Shoulder, Hip, Knee, and Ankle Joints.

Tear on the tendon, ligament and articular cartilage of the joints do not heal by itself and new modalities of treatment are required to address the need for full restoration of joint functions. Accompanied by degenerative diseases, the healing of these tissues does not occur naturally and hence requires surgical interventions, but with associated morbidity. Tissue engineering strategies are now focusing on the effective incorporation of biomechanical stimulation by the application of biomechanical forces relevant to the tissue of interest to regenerate and engineer functional tissues. Bioreactors are being continuously developed to accomplish this goal. Although bioreactors have been developed, the advancement in the field of biomaterial, basic science, and cell engineering warrant further refinement for their effective use. In this article we reviewed the application of biomechanical forces in the tissue engineering and regeneration of the joints such as rotator cuff of shoulder, ball and socket joint of the hip, articular cartilage of knee, and the ankle joints.

Biomechanically-Consistent Skin Stretch as an Intuitive Mechanism for Sensory Feedback: A Preliminary Investigation in the Lower Limb.

The proprioceptive loss accompanied by lower limb amputation can impair function and mobility. We explore a simple, mechanical skin-stretch array configured to generate superficial tissue behaviour that might occur with movement about an intact joint. Four adhesive pads attached around the circumference of the lower leg were connected via cords to a remote "foot" mounted on a ball joint attached to the underside of a fracture boot, such that "foot" reorientation would result in skin stretch. In two discrimination experiments performed with and without the connection, with no view of the mechanism, and with minimal training, unimpaired adults (i) estimated foot orientation following passive foot rotations (eight directions), either with or without contact between the lower leg and boot, and (ii) actively lowered the "foot" to estimate slope orientation (four directions). In (i), 56-60% of responses (depending on contact condition) were correct and 88-94% were either correct or one of the two adjacent choices. In (ii), 56% of responses were correct. In contrast, without the connection, participants performed near or no different to chance. A biomechanically-consistent skin stretch array may be an intuitive means to convey proprioceptive information from an artificial or poorly innervated joint.

MEDICAL REHABILITATION GONIOMETRICAL SYSTEM

Physiological rehabilitation is applied in medical practice to restore a person's functional ability after musculoskeletal injuries. Movements in the joints are the main functional indicator of the activity of the organs of support and movement. The paper considers a resistive goniometric sensor in the form of a ball joint. Based on such a sensor, a medical rehabilitation goniometric system is developed. It includes also a data collection device (autonomous data recorder) and a portable modem. That is why the system works autonomously in real-time and transmits data over a distance. This allows the system to be mobile and control joint mobility without the direct involvement of a doctor.

Board-Level Drop Impact Reliability Analysis of Dual-Side Molding System-in- Package (SiP) Modules

System-in-package (SiP) modules are widely used in portable electronics such as Internet of Things (IoT) devices and mobile consumer equipment since they integrate multiple components in a single package and thus facilitate device miniaturization. An advanced packaging technology referred to as dual-side molding (DSM) has recently been proposed as a means of achieving even smaller form factors and lower cost solutions. However, shrinking the package size reduces the solder joint connection area between the SiP module and the printed circuit board (PCB). Consequently, the board-level drop reliability may be severely impaired. Accordingly, the present study utilizes a numerical model to investigate the board-level solder joint reliability of a DSM SiP package in drop impact tests performed in accordance with the Joint Electron Device Engineering Council (JEDEC) standard. The validity of the numerical model combined with a full-factorial design method is then employed to examine the effects of the main design parameters of the DSM SiP package on the reliability of the solder joints in the drop impact test. Overall, the present results show that a higher EMC coverage of the solder ball joints yields a significant improvement in the solder joint reliability. In addition, a larger solder joint volume is beneficial in reducing the solder joint stress by absorbing a greater proportion of the impact load and energy produced in the drop impact event.

Evaluation of Estructural performance using Nonlinear Static Analysis applied in an infrastructure.

The methods of nonlinear analysis allow a better structural design and more accurate answers in the verification of a structure, through which it is based on the linear analysis of the educational institution Héctor Rene Lanegra Romero; this has a current systemic structural configuration 780, which has been designed under the parameters of the E.030 standard. To know, verify and analyze the structural performance in which the educational institution is located, nonlinear static analysis was used; which consists of a Pushover analysis. The Pushover analysis allows us to calculate the seismic actions in structures where the elastic behavior of each element is observed, it also allows us to see the operational seismic performance in which the educational institution is located, through which capacity curves are obtained, generation of plastic ball joints and the verification of the point of performance of the building; which allows identifying if the said structure is active for a seismic signal.