Disc resonator gyroscope fabrication process requiring no bonding alignment

A method of fabricating a resonant vibratory sensor, such as a disc resonator gyro. A silicon baseplate wafer for a disc resonator gyro is provided with one or more locating marks. The disc resonator gyro is fabricated by bonding a blank resonator wafer, such as an SOI wafer, to the fabricated baseplate, and fabricating the resonator structure according to a pattern based at least in part upon the location of the at least one locating mark of the fabricated baseplate. MEMS-based processing is used for the fabrication processing. In some embodiments, the locating mark is visualized using optical and/or infrared viewing methods. A disc resonator gyroscope manufactured according to these methods is described

Experimental analysis of the robotized assembly applying vibrations

Main stages of the vibratory assembly, i.e. part-to-part alignment and joining of the cylindrical parts are considered in the presented paper. The shaft is movably based in the remote compliance center device, which is attached to robotic gripper, while the bushing is immovably located on the platform of the vibrator and provided with vibratory excitation along the joining axis direction. The experimental setup and research technique are presented. Vibratory alignment duration dependences on bushing excitation frequency, amplitude of the acceleration and on the axial misalignment of parts were established. The areas of excitation and system parameters sets for reliable part-to-part alignment were determined. Dependences of shaft and bushing joining stages durations on bushing excitation frequency, amplitude and axial misalignment of the parts were analyzed. It was determined that vibratory excitation during the joining provides possibility to avoid jamming of the part

Sensing Movement: Microsensors for Body Motion Measurement

Recognition of body posture and motion is an important physiological function that can keep the body in balance. Man-made motion sensors have also been widely applied for a broad array of biomedical applications including diagnosis of balance disorders and evaluation of energy expenditure. This paper reviews the state-of-the-art sensing components utilized for body motion measurement. The anatomy and working principles of a natural body motion sensor, the human vestibular system, are first described. Various man-made inertial sensors are then elaborated based on their distinctive sensing mechanisms. In particular, both the conventional solid-state motion sensors and the emerging non solid-state motion sensors are depicted. With their lower cost and increased intelligence, man-made motion sensors are expected to play an increasingly important role in biomedical systems for basic research as well as clinical diagnostics

Implementation of a warning system against engine overheating in vehicles with multipoint injection

[EN] The temperature in a vehicle is a fundamental factor for its correct operation. When a failure occurs in the original temperature sensor, irreversible damage to engine components can occur due to overheating. In the present work, an auxiliary temperature system is implemented that alerts the driver before an eventual overheating of the engine by means of sound, visual and vibratory signals. The system compares the data provided by an LM35 temperature sensor and a Hall effect sensor in charge of counting the RPM in real time, using an Arduino, continuously processing the data and constantly informing the driver via an LCD screen. When a critical temperature is exceeded, an audible alarm will sound and a vehicle injector will be disabled. The system does not turn off the engine and is efficient in its purpose of alerting the driver, being suitable to implement in vehicles with multipoint injection due to its low cost of implementation.Paredes, C.; Guayllas, P.; Méndez, R.; Pozo, A. (2022). Implementation of a warning system against engine overheating in vehicles with multipoint injection. Journal of Applied Research in Technology & Engineering. 3(2):79-83. https://doi.org/10.4995/jarte.2022.17392OJS79833

PKM mechatronic clamping adaptive device

This study proposes a novel adaptive fixturing device based on active clamping systems for smart micropositioning of thin-walled precision parts. The modular architecture and the structure flexibility make the system suitable for various industrial applications. The proposed device is realized as a Parallel Kinematic Machine (PKM), opportunely sensorized and controlled, able to perform automatic error-free workpiece clamping procedures, drastically reducing the overall fixturing set-up time. The paper describes the kinematics and dynamics of this mechatronic system. A first campaign of experimental trails has been carried out on the prototype, obtaining promising results

Recent Sikorsky R and D progress

The recent activities and progress in four specific areas of Sikorsky's research and development program are summarized. Since the beginning of the S-76 design in 1974, Sikorsky has been aggressively developing the technology for using composite materials in helicopter design. Four specific topics are covered: advanced cockpit/controller efforts, fly-by-wire controls on RSRA/X-Wing, vibration control via higher harmonic control, and main rotor aerodynamic improvements

Development of supercritical pressure cryogenic storage and supply systems incorporating the radial bumper-discrete shield design Final report

Design of super critical pressure cryogenic storage and supply equipment with radial bumper shiel

Implementation of automated assembly

Research has shown that about 60 - 80% wealth producing activities is related to manufacturing in major industrial countries. Increased competition in industry has resulted in a greater emphasis on using automation to improve productivity and quality and also to reduce cost. Most of the manufacturing works such as machining, painting, storage, retrieval, inspection and transportation have changed to automation successfully, except assembly. Manual assembly is predominant over automatic assembly techniques due to inherent assembly problem and the fact that the assembly machines lack the innate intelligence of human operator and lack sufficient flexibility to changeover when product designs and market demands change. With the advent of flexible manufacturing systems, which involve very large capital costs and complex interactions. For the reduction the risk of the investment and analyze the system, simulation is a valuable tool in planning the systems and in analyzing their behavior, and get the best use of them. This thesis applies animation techniques to simulate an automatic assembly system. In chapter 1 to 9, we cover some of the fundamental concepts and principles of automatic assembly and simulation. Some manufacturers put the subject of part orientation first on their list of priorities; but design for assembly (DFA) techniques have proven extremely valuable in developing better assembly techniques and ultimately, better products. We discuss DFA in chapter 1, part feeding and orientation in chapter 2. Chapter 3, 4 and 5 are concerned with assembly process, machines and control system, respectively. Annual sales for industrial robots have been growing at the rate of about 25 percent per year in major industrial countries, we review the robot application in chapter 6. The cost of material handling is a significant portion of the total cost of production, material storage uses valuable space and consumes investment, we cover these two topics in chapter 7 and 8. Chapter 9 is concerned with simulation. In chapter 10, 11,12 and 13, we implement a software package IGRIP to build a model of an automatic assembly system and analyze the result

Gyrodampers for large space structures

The problem of controlling the vibrations of a large space structures by the use of actively augmented damping devices distributed throughout the structure is addressed. The gyrodamper which consists of a set of single gimbal control moment gyros which are actively controlled to extract the structural vibratory energy through the local rotational deformations of the structure, is described and analyzed. Various linear and nonlinear dynamic simulations of gyrodamped beams are shown, including results on self-induced vibrations due to sensor noise and rotor imbalance. The complete nonlinear dynamic equations are included. The problem of designing and sizing a system of gyrodampers for a given structure, or extrapolating results for one gyrodamped structure to another is solved in terms of scaling laws. Novel scaling laws for gyro systems are derived, based upon fundamental physical principles, and various examples are given