Six-channel spectrum averager for environmental acoustic testing.
Acoustic spectrum averager for Mariner spacecraft environmental tests, calculating rms average 1/3 octave spectrum bands in real time
Chapman, C. P.↗
Engineering topics
Chapman, C. P.
Publications and source records attributed to Chapman, C. P..
A digitally controlled vibration or acoustics testing system. I - Advantages and basic concepts.
Vibration/acoustics environmental testing, discussing advantages of digital computer control system and digital noise generation techniques
Chapman, C. P.↗
Scanning techniques for random noise testing.
Scanning techniques for random noise and vibration testing of spacecraft using multiple channel accelerometer
Chapman, C. P.↗
A power-spectral-density computer program
Computer program simplifies and clarifies random noise vibration test results. It also varies PSD test specifications, sets up automatic equalization equipment, and calculates an exact accleration level for the random noise prior to the test.
Chapman, C. P.↗
Instrument sequentially samples ac signals from several accelerometers
Scanner circuit sequentially samples the ac signals from accelerometers used in conducting noise vibration tests, and provides a time-averaged output signal. The scanner is used in conjunction with other devices for random noise vibration tests.
Chapman, C. P.↗
Instrument automatically selects peak acceleration signal from several accelerometers
Solid state circuit selects the highest of several ac accelerometer signals and gates this signal to an output amplifier, preserving all the frequency information in the peak signal. If the amplitudes of the accelerometer signals change with time, the circuit will continually switch to the highest signal, rejecting the smaller signals.
Chapman, C. P.↗
Solid state circuit switches ac load
Differential amplifier circuit switches ac signals with peak amplitudes greater than 5 volts. This solid state circuit biases a switching transistor on and off by a 0.1 to 5.0 dc control voltage.
Chapman, C. P.↗
A Power-spectral-density Computer Program for the Vibration Laboratory
Computer program for calculating vibration- acceleration densities along power-spectral density plots in vibration tests
COMPUTER PROGRAM↗
A power spectral density computer program for the vibration laboratory.
Power spectral density computer program for vibration-acceleration calculation
VIBRATIONAL SPECTRUM↗
Derivation of the mathematical transfer function of an electrodynamic vibration exciter
Mathematical transfer function derivation for electrodynamic vibration exciter
MATHEMATICAL MODEL↗