Method and apparatus for synthesizing music tones with high harmonic content

1989 ◽  
Vol 86 (5) ◽  
pp. 2054-2054
Author(s):  
Hiroshi Hirano ◽  
Kazuhisa Okamura
Keyword(s):  
High Harmonic ◽  
Harmonic Content

scholarly journals Advanced Scheme to Generate MHz, Fully Coherent FEL Pulses at nm Wavelength

2021 ◽  
Vol 11 (13) ◽  
pp. 6058
Author(s):  
Georgia Paraskaki ◽  
Sven Ackermann ◽  
Bart Faatz ◽  
Gianluca Geloni ◽  
Tino Lang ◽  
...  
Keyword(s):  
Repetition Rate ◽  
High Harmonic ◽  
High Repetition Rate ◽  
Optical Cavities ◽  
Electron Bunches ◽  
High Repetition ◽  
Average Brightness ◽  
Technical Requirements ◽  
Harmonic Content ◽  
Unique Approach

Current FEL development efforts aim at improving the control of coherence at high repetition rate while keeping the wavelength tunability. Seeding schemes, like HGHG and EEHG, allow for the generation of fully coherent FEL pulses, but the powerful external seed laser required limits the repetition rate that can be achieved. In turn, this impacts the average brightness and the amount of statistics that experiments can do. In order to solve this issue, here we take a unique approach and discuss the use of one or more optical cavities to seed the electron bunches accelerated in a superconducting linac to modulate their energy. Like standard seeding schemes, the cavity is followed by a dispersive section, which manipulates the longitudinal phase space of the electron bunches, inducing longitudinal density modulations with high harmonic content that undergo the FEL process in an amplifier placed downstream. We will discuss technical requirements for implementing these setups and their operation range based on numerical simulations.

Kinematics Synthesis of Linkage Mechanisms With Cam Integrated Joints for Controlled Harmonic Content of the Output Motion

2004 ◽  
Vol 126 (1) ◽  
pp. 135-142 ◽  
Author(s):  
Lifang Yuan ◽  
Jahangir S. Rastegar
Keyword(s):  
Closed Loop ◽  
Vibrational Excitation ◽  
High Harmonic ◽  
Harmonic Component ◽  
Primary Source ◽  
Effective Length ◽  
Linkage Mechanism ◽  
Function Generation ◽  
Harmonic Content ◽  
Four Bar Linkage

A new method is presented for the modification of the output motion of linkage mechanisms with closed-loop chains using cams positioned at one or more of its joints. As an example and to present the basic concept, the method is applied to a four-bar linkage mechanism that is synthesized for function generation for the purpose of eliminating the high harmonic component of the output link motion. By eliminating the high harmonic component of the output motion of a mechanism, the potential vibrational excitation that the mechanism can impart on the overall system, including its own structure, is greatly reduced. The resulting system should therefore be capable of operating at higher speeds and with increased precision. For mechanisms with rigid links, the primary source of high harmonics in the output motion is the nonlinearity of the kinematics of their closed-loop chains. With the present method, a selected range or ranges of high harmonic motions generated due to such nonlinearities may be eliminated by integrating appropriately designed cams that are used to vary the effective length of one or more of the links during the motion. A numerical example is provided together with a discussion of the related topics of interest.

Linkage Mechanisms With Cam-Integrated Joints for Controlled Harmonic Content of the Output Motion: Theory and Application

2007 ◽  
Vol 130 (1) ◽  
Author(s):  
L. Yuan ◽  
J. Rastegar ◽  
J. Zhang
Keyword(s):  
Closed Loop ◽  
Vibrational Excitation ◽  
High Harmonic ◽  
Harmonic Component ◽  
Linkage Mechanism ◽  
Mechanism Synthesis ◽  
Cam Mechanism ◽  
Harmonic Content ◽  
Harmonic Components ◽  
Four Bar Linkage

In a recent study, the authors presented a systematic method for the modification of the output motion of linkage mechanisms with closed-loop chains using cams positioned at one or more joints of the mechanism. In this paper, the method is applied to the design of a linkage mechanism with an integrated cam mechanism to eliminate high harmonic component of the output motion. The mechanism may be synthesized using any existing linkage mechanism synthesis technique. In the present study, a cam mechanism is synthesized to eliminate all high harmonic components of the output link motion of a four-bar linkage mechanism to illustrate the potentials of the present approach. The mechanism is then constructed and successfully tested. With the present method, selected ranges of high harmonic motions generated due to the mechanisms kinematics nonlinearity can be eliminated by integrating appropriately designed cams, thereby significantly reducing the potential vibrational excitation that the mechanism can impart on the overall system, including its own structure. Such systems should therefore be capable of operating at higher speeds and with increased precision.

Optimal Motion Patterns for Golf Swings

1998 ◽  
Author(s):  
L. Yuan ◽  
J. Rastegar ◽  
F. Pollo
Keyword(s):  
Nonlinear Dynamics ◽  
Dynamic Response ◽  
High Speed ◽  
Robot Manipulator ◽  
High Harmonic ◽  
Maximum Output ◽  
Robot Arm ◽  
Motion Patterns ◽  
Joint Torques ◽  
Harmonic Content

Abstract Due to the dynamic response and maximum output force (torque) limitations of their actuating motors, computer controlled machines such as robot manipulators can only have a limited performance in terms of the time to complete a specified motion and other similar measures of operating speed. For example, a robot manipulator arm with limited joint motion can only reach a maximum end-effector speed due to the aforementioned limitations of its actuating torque. The dynamic response limitations of the actuators dictate that for high speed motions, the robot arm should be required to follow trajectories for which the required actuating torques do not contain harmonics with frequencies beyond the “bandwidth” of its actuators. For systems with nonlinear dynamics such as robot arms with revolute joints operating at high speeds, the higher harmonics of the actuating torques are the harmonics of the joint trajectories that are generated due to the nonlinear dynamics of the system. During sport activities, the muscle forces and the resulting limb motions can also be expected to be subject to similar dynamic response limitations. The present study examines such a hypothesis. The measured motion at the shoulder and the wrist of an experienced golfer during downswing is measured and together with the required muscle generated actuating torques are analyzed for their harmonic content. Similar analysis is also performed for published motion data for expert golfers. The results confirm the hypothesis that optimal golf swing motions consist almost entirely of low harmonic patterns that are synthesized to require joint torques with negligible high harmonic content.

High-harmonic content in trapped-plasma-mode oscillators

1971 ◽  
Vol 7 (15) ◽  
pp. 426 ◽  
Author(s):  
C.P. Snapp ◽  
J.P. Baukus
Keyword(s):  
High Harmonic ◽  
Plasma Mode ◽  
Harmonic Content

Research on a New Type of Plating Power Supply

2014 ◽  
Vol 513-517 ◽  
pp. 3518-3521
Author(s):  
Yi Hong He ◽  
Shui Yong Yu
Keyword(s):  
Power Factor ◽  
Power Supply ◽  
Pulse Generator ◽  
High Harmonic ◽  
Simulation Models ◽  
Pwm Rectifier ◽  
Soft Switch ◽  
Pwm Converter ◽  
Harmonic Content ◽  
New Type

Viewing the problems of lower power factor, high harmonic content, lots of switch losses in tubes of lagging bridge arm when using FB-ZVS-PWM converter in plating power supply, this paper applied the three-level PWM rectifier technology to electroplating power supply, A new converter has been researched. Both different converters have also been compared and analyzed. Phase shift pulse generator and simulation models have been established in Matlab/Simulink. The results show that the PS-FB-ZVZCS PWM converter is more suitable for plating power supply, phases of current and voltage are synchronous, it has the advantages of higher power factor, low harmonic content. All the switch tubes have achieved soft switch, reducing the switch losses, it can improve the efficiency and its performance effectively.

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